Optical imaging lens, camera module, and terminal device

Abstract

An optical imaging lens (100), a camera module (200), and a terminal device (1000). The optical imaging lens (100) comprises a first lens (10), a second lens (20), a third lens (30), a fourth lens (40), a fifth lens (50), and a sixth lens (60); the maximum entrance pupil diameter of the optical imaging lens (100) is EPDmax; the minimum entrance pupil diameter of the optical imaging lens (100) is EPDmin; and the following relation is satisfied: (EPDmax-EPDmin) / EPDmax>0.35. Therefore, the optical imaging lens (100) has a large variable-aperture change range, which is beneficial for improving the imaging effect of the optical imaging lens (100) when switching between bright and dark environments; and the number of lenses of the optical imaging lens (100) is six, thereby achieving low costs and a small size, and obtaining a high-quality imaging picture.

Description

Optical imaging lenses, camera modules and terminal equipment

[0001] This application claims priority to Chinese patent application filed on September 30, 2024, with application number 202411403387.5 and entitled "Optical Imaging Lens, Camera Module and Terminal Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical imaging technology, and in particular to an optical imaging lens, a camera module, and a terminal device. Background Technology

[0003] In recent years, with the rapid development of smart mobile terminals (mobile phones, tablets, etc.), consumers have increasingly higher demands for shooting experience and photo quality, and handheld mobile terminals with high imaging quality are becoming more and more popular.

[0004] However, in some flagship models, the variable aperture camera module often uses an optical imaging lens with 7 or 8 lenses, which is expensive and large in size. Therefore, it is worth considering how to obtain high-quality photos with a relatively small number of lenses. Summary of the Invention

[0005] This application provides an optical imaging lens, a camera module, and a terminal device, which can improve the technical problem in the related technical field that optical imaging lenses are difficult to achieve low cost, small size, and high imaging quality at the same time.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, this application provides an optical imaging lens, comprising, from the object side to the image side, the following in sequence:

[0008] A first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave;

[0009] A second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave;

[0010] A third lens with positive optical power;

[0011] A fourth lens with negative optical power; the image-side surface of the fourth lens is concave.

[0012] A fifth lens with positive optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is convex.

[0013] The sixth lens has a negative optical power, the object side of the sixth lens is convex, and the image side of the sixth lens is concave;

[0014] The maximum entrance pupil diameter of the optical imaging lens is EPDmax, and the minimum entrance pupil diameter of the optical imaging lens is EPDmin, satisfying (EPDmax - EPDmin) / EPDmax > 0.35.

[0015] The above technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0016] For the optical imaging lens provided in the embodiments of the present application, the maximum entrance pupil diameter of the optical imaging lens is EPDmax, and the minimum entrance pupil diameter of the optical imaging lens is EPDmin, satisfying (EPDmax - EPDmin) / EPDmax > 0.35, which can enable the optical imaging lens to have a large variable aperture change range, is beneficial to the imaging effect when the optical imaging lens switches between bright and dark environments, and moreover, the number of lenses of the optical imaging lens is six, with lower cost and smaller volume, and can obtain higher-quality imaging pictures.

[0017] In some embodiments, the distance Dtstop in the optical axis direction between the maximum aperture position and the minimum aperture position of the optical imaging lens, and the maximum distance sag11 in the optical axis direction from the intersection point of the object side of the first lens and the optical axis to any point on the object side of the first lens satisfy 0 ≤ Dstop / sag11 < 0.9.

[0018] It can be understood that satisfying 0 ≤ Dstop / sag11 < 0.9 can reasonably arrange the variable aperture positions on the object side of the first lens, which is beneficial to the installation of the variable aperture component.

[0019] In some embodiments, the effective focal length of the second lens is f2, and the total effective focal length of the optical imaging lens is f;

[0020] -0.5 < f / f2 < -0.2.

[0021] It can be understood that satisfying -0.5 < f / f2 < -0.2 can effectively control the ratio of the effective focal length of the second lens to the total effective focal length of the imaging lens, balance the aberration introduced by the first lens, and improve the imaging quality.

[0022] In some embodiments, the effective focal length of the third lens is f3, and the total effective focal length of the optical imaging lens is f;

[0023] 2.5 < f3 / f < 10.

[0024] Understandably, satisfying 2.5 < f3 / f < 10 can effectively control the ratio of the effective focal length of the third lens to the total effective focal length of the imaging lens, enabling light to smoothly transition to subsequent lenses, reducing system aberration, and improving imaging quality.

[0025] In some embodiments, the distance from the object side surface of the first lens of the optical imaging lens to the imaging surface in the optical axis direction is TTL, the curvature radius of the object side surface of the first lens is R11, and the curvature radius of the image side surface of the sixth lens is R62;

[0026] 10 < TTL / (R62 / R11) < 11.5.

[0027] Understandably, satisfying 10 < TTL / (R62 / R11) < 11.5 can effectively balance the shapes of the incident and exit surfaces of the lens, facilitating obtaining a smaller TTL, reducing lens aberration, and improving imaging quality.

[0028] In some embodiments, the maximum half field angle of view of the optical imaging lens is HFOV;

[0029] EPDmax * tan(HFOV) > 2.9.

[0030] Understandably, satisfying EPD * tan(HFOV) > 2.9 can endow the optical imaging lens with a larger light passing aperture, which is conducive to improving the imaging effect of the optical imaging lens in a dark environment. [[ID= XIX]]

[0031] In some embodiments, the distance from the object side surface of the first lens of the optical imaging lens to the imaging surface in the optical axis direction is TTL; half of the diagonal length of the effective pixel area on the imaging surface of the photographic lens is ImgH;

[0032] TTL / ImagH ≤ 1.4.

[0033] Understandably, satisfying TTL / ImagH ≤ 1.4 can effectively reduce the TTL of the lens, thereby achieving miniaturization of the module.

[0034] In some embodiments, the effective focal length of the first lens is f1, the effective focal length of the sixth lens is f6, the curvature radius of the object side surface of the first lens is Rll, and the curvature radius of the image side surface of the sixth lens is R62;

[0035] 4.5 < f1 / R11 - f6 / R62 < 5.

[0036] Understandably, satisfying 4.5 < f1 / R11 - f6 / R62 < 5 can effectively constrain the effective focal lengths and lens shapes of the first lens and the sixth lens, reasonably distribute the optical powers of the two lenses, balance system aberration, and thus improve the system imaging quality.

[0037] In some embodiments, the effective focal length of the first lens is f1, the effective focal length of the fourth lens is f4, and the effective focal length of the fifth lens is f5;

[0038] -1 < F1 / (F4 + F5) < 0.

[0039] It can be understood that satisfying -1 < F1 / (F4 + F5) < 0 can reasonably distribute the optical powers of the first lens, the fourth lens, and the fifth lens, balance the system aberration, and improve the system imaging quality.

[0040] In some embodiments, the central thickness of the second lens on the optical axis is CT2, the central thickness of the third lens on the optical axis is CT3, and the distance between the image side surface of the second lens and the object side surface of the third lens on the optical axis is DT23;

[0041] 1.5 < (CT2 + CT3) / DT23 < 2.5.

[0042] It can be understood that satisfying 1.5 < (CT2 + CT3) / DT23 < 2.5 can make the structural distribution of the second lens and the third lens more reasonable, which is beneficial to the assembly of the imaging lens.

[0043] In some embodiments, the central thickness of the fourth lens on the optical axis is CT4, the central thickness of the fifth lens on the optical axis is CT5, and the central thickness of the sixth lens on the optical axis is CT6;

[0044] 1.3 < (CT4) / (CT5 - CT6) < 2.

[0045] It can be understood that satisfying 1.3 < (CT4) / (CT5 - CT6) < 2 can make the structures of the fourth lens, the fifth lens, and the sixth lens more uniform and reasonable, which is beneficial to the processing and forming of the lens.

[0046] In some embodiments, the maximum distance in the optical axis direction from the intersection point of the object side surface of the fifth lens and the optical axis to any point on the object side surface of the fifth lens is Sag51, the maximum distance in the optical axis direction from the intersection point of the image side surface of the sixth lens and the optical axis to any point on the image side surface of the sixth lens is Sag62, the central thickness of the fifth lens on the optical axis is CT5, and the central thickness of the sixth lens on the optical axis is CT6;

[0047] 1 < |Sag51 / CT5| + |Sag62 / CT6| < 2.

[0048] It can be understood that satisfying 1 < |Sag51 / CT5| + |Sag62 / CT6| < 2 can make the surface shapes of the fifth lens and the sixth lens smoother, which is beneficial to the processing and forming of the lens. At the same time, it can effectively balance the field curvature of the imaging lens.

[0049] In some embodiments, the maximum distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens is Td, and the sum of the thicknesses of all the lenses of the optical imaging lens on the optical axis is ∑CT;

[0050] 1.5 < Td / ∑CT < 1.8.

[0051] It can be understood that satisfying 1.5 < Td / ∑CT < 1.8 is helpful for the spatial arrangement of the lens group of the imaging lens, reducing the volume and total length of the lens group of the imaging lens to meet the requirements of miniaturization.

[0052] In some embodiments, the object side surface of the third lens is convex, and the image side surface of the third lens is convex; or,

[0053] the object side surface of the third lens is convex, and the image side surface of the third lens is concave; and / or,

[0054] the object side surface of the fourth lens is convex; or,

[0055] the object side surface of the fourth lens is concave.

[0056] In a second aspect, the present application provides an imaging module, including the above-mentioned optical imaging lens and an iris diaphragm, and the iris diaphragm is used to adjust the amount of light passing through the optical imaging lens.

[0057] In a third aspect, the present application provides a terminal device, including the above-mentioned imaging module.

[0058] It can be understood that for the beneficial effects of the above second aspect and third aspect, reference can be made to the relevant descriptions in the above first aspect, and details are not repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] FIG. 1 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

[0060] FIG. 2 is a schematic diagram of an imaging principle provided by an embodiment of the present application;

[0061] FIG. 3 is a schematic structural diagram of an optical imaging lens provided by an embodiment of the present application;

[0062] FIG. 4 is an optical data table of an optical imaging lens provided by Embodiment 1 of the present application;

[0063] FIG. 5 is an aspherical data table of each lens of the optical imaging lens provided by Embodiment 1 of the present application;

[0064] FIG. 6 is an astigmatism field curve on the image plane of the optical imaging lens provided by Embodiment 1 of the present application in a large aperture state;

[0065] FIG. 7 is a distortion aberration on the image plane of the optical imaging lens provided by Embodiment 1 of the present application in a large aperture state.

[0066] Figure 8 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 1 of this application when it is in a small aperture state;

[0067] Figure 9 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 1 of this application when it is in a small aperture state;

[0068] Figure 10 is an optical data sheet of the optical imaging lens provided in Embodiment 2 of this application;

[0069] Figure 11 is a table of aspherical data for each lens of the optical imaging lens provided in Embodiment 2 of this application;

[0070] Figure 12 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 2 of this application when it is in a large aperture state;

[0071] Figure 13 shows the distortion aberration on the image plane of the optical imaging lens provided in Embodiment 2 of this application when it is in a large aperture state;

[0072] Figure 14 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 2 of this application when it is in a small aperture state;

[0073] Figure 15 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 2 of this application when it is in a small aperture state;

[0074] Figure 16 is an optical data sheet of the optical imaging lens provided in Embodiment 3 of this application;

[0075] Figure 17 is a table of aspherical data for each lens of the optical imaging lens provided in Embodiment 3 of this application;

[0076] Figure 18 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 3 of this application when it is in a large aperture state;

[0077] Figure 19 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 3 of this application when it is in a large aperture state.

[0078] Figure 20 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 3 of this application when it is in a small aperture state;

[0079] Figure 21 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 3 of this application when it is in a small aperture state;

[0080] Figure 22 is an optical data sheet of the optical imaging lens provided in Embodiment 4 of this application;

[0081] Figure 23 is a table of aspherical data for each lens of the optical imaging lens provided in Embodiment 4 of this application;

[0082] Figure 24 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 4 of this application when it is in a large aperture state;

[0083] Figure 25 shows the distortion aberration on the image plane of the optical imaging lens provided in Embodiment 4 of this application when it is in a large aperture state;

[0084] Figure 26 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 4 of this application when it is in a small aperture state;

[0085] Figure 27 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 4 of this application when it is in a small aperture state;

[0086] Figure 28 is an optical data sheet of the optical imaging lens provided in Embodiment 5 of this application;

[0087] Figure 29 is a table of aspherical data for each lens of the optical imaging lens provided in Embodiment 5 of this application;

[0088] Figure 30 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 5 of this application when it is in a large aperture state;

[0089] Figure 31 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 5 of this application when it is in a large aperture state;

[0090] Figure 32 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 5 of this application when it is in a small aperture state;

[0091] Figure 33 shows the distortion aberration on the image plane of the optical imaging lens provided in Embodiment 5 of this application when it is in a small aperture state;

[0092] Figure 34 is an optical data sheet of the optical imaging lens provided in Embodiment Six of this application;

[0093] Figure 35 is a table of aspherical data for each lens of the optical imaging lens provided in Embodiment 6 of this application;

[0094] Figure 36 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 6 of this application when it is in a large aperture state;

[0095] Figure 37 shows the distortion aberrations on the image plane of the optical imaging lens provided in Embodiment 6 of this application when it is in a large aperture state;

[0096] Figure 38 shows the astigmatism curve on the image plane of the optical imaging lens provided in Embodiment 6 of this application when it is in a small aperture state;

[0097] Figure 39 shows the distortion aberration on the image plane of the optical imaging lens provided in Embodiment 6 of this application when it is in a small aperture state.

[0098] In the figure, the following labels are used: 1000, terminal device; 200, camera module; 300, housing; 400, display screen; 100, optical imaging lens; 101, image sensor; 102, analog-to-digital converter; 103, image processor; 104, memory; 10, first lens; 20, second lens; 30, third lens; 40, fourth lens; 50, fifth lens; 60, sixth lens. A. Object side; B. Image side; 30. Variable stop; 40. Image plane; I. Optical axis; E11. Object side of the first lens; E21. Object side of the second lens; E31. Object side of the third lens; E41. Object side of the fourth lens; E51. Object side of the fifth lens; E61. Object side of the sixth lens; E12. Image side of the first lens; E22. Image side of the second lens; E32. Image side of the third lens; E42. Image side of the fourth lens; E52. Image side of the fifth lens; E62. Image side of the sixth lens. Detailed Implementation

[0099] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0100] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0101] In the description of this application, it should be understood that the terms "length", "width", "thickness", "top", "bottom", "inner", "outer", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0102] The terms "first," "second," "third," "fourth," "fifth," and "sixth," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, "first deformation space" and "second deformation space" are merely used to distinguish different deformation spaces and do not limit their order. A first deformation space can also be named a second deformation space, and a second deformation space can also be named a first deformation space, without departing from the scope of the various described embodiments. Furthermore, the terms "first," "second," etc., do not imply that the indicated features must be different.

[0103] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0104] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0105] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner.

[0106] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0107] In a specific application scenario of optical imaging lenses, such as when shooting in bright sunlight during the day or under direct streetlights at night, bright lines or arcs with distinct boundaries will appear in the image from a certain angle. These bright lines or arcs are called "lens ghosting," which greatly and seriously affects the user's shooting experience and image quality.

[0108] Furthermore, the main cause of "lens ghosting" is secondary or quaternary reflection in the first lens element of the optical imaging lens. Therefore, the brightness of bright lines or arcs in the image depends on the number of total reflections that occur in the first lens element of the optical imaging lens.

[0109] In view of this, this application provides an optical imaging lens, wherein the first lens group includes a first lens, an intermediate medium, and a second lens arranged sequentially from the object side to the image side. The refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the intermediate medium is n3. Furthermore, the refractive indices of each lens and the intermediate medium have the following relationship: |n1-n3| / n2 < 0.15. This can balance the chromatic aberration of the optical imaging lens, improve the overall imaging quality of the optical imaging lens, and effectively reduce the probability of total internal reflection, thereby reducing the probability of "lens ghosting" caused by total internal reflection.

[0110] The terminal device 1000 involved in the embodiments of this application may include handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. It may also include cellular phones, smartphones, personal digital assistant (PDA) computers, tablet computers, laptop computers, machine type communication (MTC) terminals, point of sale (POS) terminals, in-vehicle computers, and other terminal devices 1000 with imaging capabilities.

[0111] For ease of understanding, the technical terms used in this application will be explained and described below.

[0112] The optical axis is the direction in which light rays travel through an optical system, referenced to the principal ray at the center of the field of view. For symmetrical transmission systems, it generally coincides with the rotation center line of the optical system. For off-axis and reflective systems, the optical axis may appear as a broken line.

[0113] The focal point is the point at which all light rays converge when they enter a convex lens, parallel to the optical axis. Ideally, a convex lens should be such that all light rays converge at a single point behind the lens.

[0114] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens or lens group to the focal point when a distant object is projected into a sharp image on the focal plane. It can also be understood as the perpendicular distance from the optical center of the lens or lens group to the focal plane. From a practical perspective, it can be understood as the distance from the center of the lens to the image plane. For prime lenses, the position of their optical center remains fixed, therefore the focal length is fixed. For zoom lenses, changes in the optical center result in changes in the focal length, thus the focal length can be adjusted.

[0115] Effective focal length refers to the distance between the point where light rays are focused onto the sensor or film after passing through a lens and the front of the lens. This distance is affected by factors such as the length of the optical path, the thickness of the lens, and its refractive index.

[0116] Based on the zoom range, lenses can be divided into several categories, such as ultra-wide-angle lenses (focal length less than 21mm), wide-angle lenses (focal length 21mm-35mm), standard lenses (focal length 35mm-70mm), medium telephoto lenses (focal length 70mm-135mm), and telephoto lenses (focal length 135-500mm+).

[0117] Zooming is helpful for magnifying distant objects when shooting from a distance. Optical zoom allows for the addition of more pixels after the subject is imaged, making the subject not only larger but also relatively clearer, without changing the resolution or image quality. Optical zoom relies on the optical lens structure to achieve zooming, specifically through changes in the positions of the lens, the object, and the focal point. When the image plane moves horizontally, the field of view and focal length change, making distant objects clearer. Optical zoom changes the focal length of the lens by altering the relative positions of the lens elements, thus magnifying or reducing the size of the subject being photographed. This image magnification is based on physical principles. During magnification, the photosensitive element directly captures light from the subject and forms an image without any electronic amplification processing. Furthermore, the photosensitive element images the entire image, maintaining its original highest resolution. Therefore, images obtained through optical zoom not only make the subject larger but also relatively clearer. The higher the optical zoom magnification, the farther away the subject can be photographed.

[0118] Zoom lenses have two focal length readings: the smaller number is called the wide-angle end (providing the maximum angle of view), and the larger number is called the telephoto end (providing the longest focal length). You can use either focal length within this range. The wider the wide-angle end (the smaller the number), the wider the scene you can capture; the longer the telephoto end (the larger the number), the farther away you can capture. Dividing the telephoto end number by the wide-angle end number gives you the zoom ratio. For example, an optical zoom ratio between 2x and 5x can bring an object 10 meters away to within 2-5 meters; a zoom ratio of 20x or higher can capture both large scenes in front of you and distant objects; a 50x zoom is equivalent to shooting from 60 meters away when photographing an object 3000 meters away.

[0119] The field of view (FOV) in optical instruments is the angle between the two edges of the lens, representing the maximum range through which the image of the object can pass through the lens. The size of the FOV determines the field of view of the optical instrument; a larger FOV results in a wider field of view but a smaller optical magnification. A shorter focal length results in a wider horizontal field of view, and consequently, a smaller image. The horizontal field of view narrows as the focal length increases, while the object being photographed grows larger.

[0120] Aberration, also known as axial chromatic aberration, longitudinal chromatic aberration, or positional chromatic aberration, is the phenomenon where a beam of light parallel to the optical axis converges at different positions after passing through a lens. This is because the lens images light of different wavelengths at different positions, causing the focal planes of the images of different colors of light to not coincide, resulting in the dispersion of polychromatic light.

[0121] The optical path of light in a lens refers to the distance that light travels from the incident surface of the lens to the image plane.

[0122] Spherical and aspherical lenses primarily refer to the geometry of lenses used in cameras, microscopes, and eyeglasses (including contact lenses), specifically spherical and aspherical lenses. The difference in their geometry determines the difference in the direction of refraction of parallel incident light, thus affecting the quality of their image formation.

[0123] Spherical lenses are spherical in shape, with their cross-section also curved. When light of different wavelengths is incident on different positions on the lens along the optical axis, it cannot be focused into a single point on the film plane (the plane perpendicular to the lens center and focal point, passing through the focal point), resulting in aberrations that affect image quality, such as decreased sharpness and distortion.

[0124] Aspherical lenses are not spherically curved; instead, the edges of the lens are slightly shaved off, resulting in a flat cross-section. When light enters an aspherical lens, it is focused at a single point, on the film plane, thus eliminating various aberrations.

[0125] In optics, a freeform surface is generally referred to as a surface without a rotational axis of symmetry.

[0126] Object space is the space in which the object being photographed is located, with the lens as the boundary.

[0127] Image space is the space behind the lens where the image formed by the light emitted from the object passes through the lens.

[0128] Using the lens as a boundary, the side where the subject is located is called the object side, and the surface of the lens closest to the object side can be called the object side surface; using the lens as a boundary, the side where the image of the subject is located is called the image side, and the surface of the lens closest to the image side can be called the image side surface.

[0129] The convexity or concavity of the optical axis region can also be determined using methods conventionally employed in the field, namely, by using the sign of the paraxial radius of curvature (R-value) to determine the convexity or concavity of the lens's optical axis region. The R-value is commonly used in optical design software such as Zemax or CodeV. It is also frequently found in lens data sheets within optical design software. For the object-side, a positive R-value indicates a convex optical axis region, while a negative R-value indicates a concave optical axis region. Conversely, for the image-side, a positive R-value indicates a concave optical axis region, while a negative R-value indicates a convex optical axis region. This method yields results consistent with the aforementioned method using the intersection of a ray / ray extension with the optical axis, where the focal point of a ray parallel to the optical axis is located on either the object-side or image-side of the lens to determine the convexity or concavity. The terms "a region is convex (or concave)," "a region is convex (or concave)," or "a convex (or concave) region" as described in this specification may be used interchangeably.

[0130] Figure 1 shows a schematic diagram of a terminal device 1000. The terminal device 1000 can be a terminal device with camera or video recording capabilities, such as a cellular phone, mobile phone, smartphone, tablet computer, laptop computer, camcorder, video recorder, camera, smartwatch, smart wristband, or other devices with camera or video recording capabilities. This application does not impose any special limitations on the specific form of the terminal device 1000. For ease of explanation and understanding, the following description uses a mobile phone as an example.

[0131] As shown in Figure 1, the aforementioned terminal device 1000 may include a display panel (DP) 400, a housing 300, and a camera compact module (CCM) 200. The housing 300 has a receiving space, within which the display panel 400 and the camera module 200 are disposed. The display panel 400 may be a liquid crystal display (LCD) screen, an organic light-emitting diode (OLED) screen, etc., wherein the OLED screen 400 may be a flexible display or a rigid display.

[0132] The camera module 200 can be installed only on the front of the terminal device 1000 to capture the scene located on one side of the front of the terminal device 1000, and in some embodiments it can be called a front-facing camera module; it can also be installed only on the back of the terminal device 1000 to capture the scene located on one side of the back of the terminal device 1000, and in some embodiments it can be called a rear-facing camera module; it can also be installed on both the front and back of the terminal device 1000, as shown in Figure 1, where the camera module 200 is installed on both the front and back of the terminal device 1000, so that it can capture the scene located on one side of the front of the terminal device 1000 and the scene located on one side of the back of the terminal device 1000, as long as the appropriate camera module is used during shooting.

[0133] It should be understood that the installation position of the camera module 200 is merely illustrative. In some embodiments, when the camera module 200 is used as a front-facing camera module, it can also be installed in other positions on the terminal device 1000, such as on the left side of the earpiece, the upper center of the terminal device 1000, the lower part (or chin) of the terminal device 1000, or one of the four corners of the terminal device 1000; when the camera module 200 is used as a rear-facing camera module, it can be installed in the upper center or upper right corner of the back of the terminal device 1000. In other embodiments, the camera module 200 may not be located on the main body of the terminal device 1000, but may be located on an edge protruding from the main body of the terminal device 1000, or on a component that is movable or rotatable relative to the main body of the terminal device 1000, such as a component that can extend outward, retract, or rotate from the main body of the terminal device 1000. When the camera module 200 can rotate relative to the terminal device 1000, it functions as both a front-facing camera module and a rear-facing camera module. That is, by rotating the same camera module 200, it can capture images of both the front and rear sides of the terminal device 1000. In other embodiments, when the display screen 400 can be folded, the camera module 200 can function as both a front-facing and a rear-facing camera module. The camera module 200 is used to capture images of either the front or rear sides of the terminal device 1000 as the display screen 400 folds.

[0134] This application embodiment does not limit the number of camera modules 200; it can be one, two, four, or even more. For example, the terminal device 1000 can have one or more camera modules 200 on the front or one or more camera modules 200 on the back. This application embodiment does not limit the number of camera modules, nor does it limit the relative positions of multiple camera modules. When multiple camera modules 200 are set, they can be identical or different. For example, the number of lenses included in the multiple camera modules 200 may differ, or the optical parameters of the lenses may differ, or the lens placement positions may differ, etc.

[0135] The camera module 200 can be used to capture videos and / or photos, and can be used to capture scenes at different distances. For example, the camera module 200 can be used to capture distant scenes, close-up scenes, and macro scenes. This application does not impose any special limitations on the embodiments.

[0136] Optionally, the terminal device 1000 may further include a lens protection lens for protecting the camera module 200. The lens protection lens is disposed on the housing 300 and covers the camera module 200. When the lens protection lens is used to protect the front-facing camera module, it may cover only the front-facing camera module or cover the entire front of the terminal device 1000. When the lens protection lens covers the entire front of the terminal device 1000, it can simultaneously protect both the front-facing camera module and the display screen 400; in this case, the lens protection lens is a cover glass (CG). When the lens protection lens is used to protect the rear-facing camera module, it may cover the entire back of the terminal device 1000 or be disposed only at the corresponding position of the rear-facing camera module to protect it. The material of the lens protection lens may be glass, sapphire, ceramic, etc., and this application embodiment does not impose any special limitations. In some embodiments, the lens protection lens is transparent, allowing light from outside the terminal device 1000 to pass through the lens protection lens and enter the camera module 200.

[0137] It should be noted that the front of the terminal device 1000 in this application embodiment can be understood as the side surface of the terminal device 1000 facing the user when the user uses the terminal device 1000, and the back of the terminal device 1000 can be understood as the side surface of the terminal device 1000 facing away from the user when the user uses the terminal device 1000.

[0138] It should be understood that the terminal device 1000 shown in FIG1 is not limited to the above-mentioned devices, and may also include other devices, such as batteries, flashlights, fingerprint recognition modules, earpieces, buttons, sensors, etc. The embodiments of this application are only described using a terminal with a camera module 200 installed as an example, but the components installed on the terminal device 1000 are not limited to these.

[0139] Figure 2 shows a schematic diagram of the imaging principle. The light L reflected by the subject passes through the optical imaging lens 100 to generate an optical image, which is projected onto the surface of the image sensor 101. The optical image is then converted into an electrical signal, namely an analog image signal S1. The analog image signal S1 is converted into a digital image signal S2 by the analog-to-digital converter 102 (also known as an A / D converter) 203. The digital image signal S2 is processed by the image processor 103, such as a digital signal processing chip (DSP), to form a compressed image signal S3, which can be stored in the memory 104 for processing. Finally, the image is displayed through the display or screen 400.

[0140] Optical lenses affect image quality and imaging effects. Light from a scene passing through an optical lens can form a clear image on the focal plane, and this image is recorded by a photosensitive material or sensor. An optical lens can be a system composed of one or more lenses. These lenses can be plastic or glass, spherical or aspherical, and can be refractive or reflective. In this embodiment, the optical lens is a zoom lens; the focal length of the optical lens can be adjusted by changing the relative positions of its lenses.

[0141] Image sensor 101 is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated, these photodiodes generate electrical charges, which are then converted into digital signals by analog-to-digital converter (ADC) chip 102. Image sensor 101 can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). CCD image sensor 101 uses a highly sensitive semiconductor material to convert light into electrical charges, which are then converted into digital signals by ADC chip 102. CCDs consist of many photosensitive units, typically measured in megapixels. When the CCD surface is illuminated, each photosensitive unit reflects a charge onto the component; the signals generated by all photosensitive units are combined to form a complete image. Complementary metal-oxide semiconductor (CMOS) primarily utilizes semiconductors made from silicon and germanium, allowing N-type (negative) and P-type (positive) semiconductors to coexist on the CMOS. The current generated by these complementary effects can be recorded and interpreted by the processing chip as an image. In some embodiments, the image sensor 101 may also be referred to as a photosensitive chip, a photosensitive element, etc.

[0142] The function of the image processor 103 is to optimize the digital image signal through a series of complex mathematical algorithms, and finally transmit the processed signal to the display. The image processor 103 can be an image processing chip or a digital signal processing chip (DSP). Its role is to transmit the data obtained by the photosensitive chip to the central processing unit in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the DSP chip directly affects the image quality (such as color saturation, sharpness, etc.).

[0143] It should be understood that the "lens" in the embodiments of this application should be understood as a whole lens, including one or more lenses.

[0144] Figure 3 shows a schematic diagram of an optical imaging lens 100. The structure of the optical imaging lens 100 is described below with reference to Figure 3.

[0145] The optical imaging lens 100 provided in this application includes, in sequence from the object side to the image side, a first lens 10 with positive optical power, the object side of the first lens 10 being convex and the image side being concave; a second lens 20 with negative optical power, the object side of the second lens 20 being convex and the image side being concave; a third lens 30 with positive optical power; a fourth lens 40 with negative optical power, the image side of the fourth lens 40 being concave; a fifth lens 50 with positive optical power, the object side of the fifth lens 50 being convex and the image side being convex; and a sixth lens 60 with negative optical power, the object side of the sixth lens 60 being convex and the image side being concave.

[0146] The maximum entrance pupil diameter of the optical imaging lens 100 is EPDmax, and the minimum entrance pupil diameter of the optical imaging lens 100 is EPDmin, satisfying (EPDmax-EPDmin) / EPDmax>0.35.

[0147] The optical imaging lens 100 provided in this application embodiment has a maximum entrance pupil diameter of EPDmax and a minimum entrance pupil diameter of EPDmin, satisfying (EPDmax-EPDmin) / EPDmax>0.35. This allows the optical imaging lens to have a large variable aperture range, which is beneficial to the imaging effect of the optical imaging lens when switching between bright and dark environments. Furthermore, the optical imaging lens has six lenses, resulting in lower cost, smaller size, and the ability to obtain higher quality imaging images.

[0148] In some embodiments, the distance Dtstop between the maximum and minimum aperture positions of the optical imaging lens 100 in the optical axis direction, and the maximum distance sag11 from the intersection of the object side surface of the first lens 10 and the optical axis to any point on the object side surface of the first lens 10 in the optical axis direction, satisfy 0≤Dstop / sag11<0.9.

[0149] Understandably, satisfying 0≤Dstop / sag11<0.9 allows for a reasonable arrangement of the variable aperture positions located on the object side of the first lens 10, which is beneficial for the installation of the variable aperture assembly.

[0150] In some embodiments, the effective focal length of the second lens 20 is f2, and the total effective focal length of the optical imaging lens 100 is f;

[0151] -0.5 <f / f2<-0.2。

[0152] Understandably, satisfying -0.5 < f / f2 < -0.2 can effectively control the ratio of the effective focal length of the second lens 20 to the total effective focal length of the imaging lens, balance the aberration introduced by the first lens 10, and improve the imaging quality.

[0153] In some embodiments, the effective focal length of the third lens 20 is f3, and the total effective focal length of the optical imaging lens 100 is f;

[0154] 2.5 < f3 / f < 10.

[0155] Understandably, satisfying 2.5 < f3 / f < 10 can effectively control the ratio of the effective focal length of the third lens 30 to the total effective focal length of the imaging lens, enable the light to smoothly transition to the subsequent lens, reduce the system aberration, and improve the imaging quality.

[0156] In some embodiments, the distance from the object side surface of the first lens 10 of the optical imaging lens 100 to the imaging surface in the optical axis direction is TTL, the curvature radius of the object side surface of the first lens 10 is R11, and the curvature radius of the image side surface of the sixth lens 60 is R62;

[0157] 10 < TTL / (R62 / R11) < 11.5.

[0158] Understandably, satisfying 10 < TTL / (R62 / R11) < 11.5 can effectively balance the shapes of the incident surface and the exit surface of the lens, is beneficial to obtaining a smaller TTL, while reducing the lens aberration and improving the imaging quality.

[0159] In some embodiments, the maximum half field angle of the optical imaging lens 100 is HFOV;

[0160] EPDmax * tan(HFOV) > 2.9.

[0161] Understandably, satisfying EPD * tan(HFOV) > 2.9 can enable the optical imaging lens 100 to have a larger light passing aperture, which is beneficial to improving the imaging effect of the optical imaging lens 100 in a dark environment.

[0162] In some embodiments, the distance from the object side surface of the first lens 10 of the optical imaging lens 100 to the imaging surface in the optical axis direction is TTL; half of the diagonal length of the effective pixel area on the imaging surface of the photographic lens is ImgH;

[0163] TTL / ImagH ≤ 1.4.

[0164] Understandably, satisfying TTL / ImagH ≤ 1.4 can effectively reduce the TTL of the lens, thereby achieving miniaturization of the module.

[0165] In some embodiments, the effective focal length of the first lens 10 is f1, the effective focal length of the sixth lens 60 is f6, the radius of curvature of the object side surface of the first lens 10 is R11, and the radius of curvature of the image side surface of the sixth lens 60 is R62;

[0166] 4.5 < f1 / R11 - f6 / R62 < 5.

[0167] It can be understood that satisfying 4.5 < f1 / R11 - f6 / R62 < 5 can effectively constrain the effective focal lengths and lens shapes of the first lens 10 and the sixth lens 60, reasonably distribute the optical powers of the two lenses, balance the system aberrations, and thus improve the system imaging quality.

[0168] In some embodiments, the effective focal length of the first lens 10 is f1, the effective focal length of the fourth lens 40 is f4, and the effective focal length of the fifth lens 50 is f5;

[0169] -1 < F1 / (F4 + F5) < 0.

[0170] It can be understood that satisfying -1 < F1 / (F4 + F5) < 0 can reasonably distribute the optical powers of the first lens 10, the fourth lens 40, and the fifth lens 50, balance the system aberrations, and improve the system imaging quality.

[0171] In some embodiments, the central thickness of the second lens 20 on the optical axis is CT2, the central thickness of the third lens 30 on the optical axis is CT3, and the distance between the image side surface of the second lens 20 and the object side surface of the third lens 30 on the optical axis is DT23;

[0172] 1.5 < (CT2 + CT3) / DT23 < 2.5.

[0173] It can be understood that satisfying 1.5 < (CT2 + CT3) / DT23 < 2.5 can make the structural distribution of the second lens 20 and the third lens 30 more reasonable, which is beneficial to the assembly of the imaging lens.

[0174] In some embodiments, the central thickness of the fourth lens 40 on the optical axis is CT4, the central thickness of the fifth lens 50 on the optical axis is CT5, and the central thickness of the sixth lens 60 on the optical axis is CT6;

[0175] 1.3 < (CT4) / (CT5 - CT6) < 2.

[0176] It can be understood that satisfying 1.3 < (CT4) / (CT5 - CT6) < 2 can make the structures of the fourth lens 40, the fifth lens 50, and the sixth lens 60 more uniform and reasonable, which is beneficial to the processing and forming of the lenses.

[0177] In some embodiments, the maximum distance in the optical axis direction from the intersection point of the object side surface of the fifth lens 50 with the optical axis to any point on the object side surface of the fifth lens 50 is Sag51, and the maximum distance in the optical axis direction from the intersection point of the image side surface of the sixth lens 60 with the optical axis to any point on the image side surface of the sixth lens 60 is Sag62. The central thickness of the fifth lens 50 on the optical axis is CT5, and the central thickness of the sixth lens 60 on the optical axis is CT6;

[0178] 1 < |Sag51 / CT5| + |Sag62 / CT6| < 2.

[0179] It can be understood that satisfying 1 < |Sag51 / CT5| + |Sag62 / CT6| < 2 can make the surface profiles of the fifth lens 50 and the sixth lens 60 smoother, which is beneficial to the processing and shaping of the lenses. At the same time, it can effectively balance the field curvature of the imaging lens.

[0180] In some embodiments, the maximum distance on the optical axis from the object side surface of the first lens 10 to the image side surface of the sixth lens 60 is Td, and the sum of the thicknesses of all the lenses of the optical imaging lens 100 on the optical axis is ∑CT;

[0181] 1.5 < Td / ∑CT < 1.8.

[0182] It can be understood that satisfying 1.5 < Td / ∑CT < 1.8 is helpful for the spatial arrangement of the lens group of the imaging lens, and can reduce the volume and total length of the lens group of the imaging lens to meet the requirements of miniaturization.

[0183] In some embodiments, the object side surface of the third lens 30 is a convex surface, and the image side surface of the third lens 30 is a convex surface; or,

[0184] The object side surface of the third lens 30 is a convex surface, and the image side surface of the third lens 30 is a concave surface. The object side surface of the fourth lens 40 is a convex surface; or,

[0185] The object side surface of the fourth lens 40 is a concave surface.

[0186] Embodiment 1

[0187] Please refer to FIGS. 4 to 9 to illustrate the first embodiment of the optical imaging lens 100 of the present application.

[0188] In this embodiment, the optical imaging lens 100 includes a total of six lenses with refractive power, an aperture stop 30, and an image plane 40, which are sequentially arranged in the direction from the object side A to the image side B, namely the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the sixth lens 60.

[0189] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0190] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0191] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is convex. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0192] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is convex, and the image-side surface E42 of the fourth lens 40 is concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0193] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0194] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0195] In the optical imaging lens 100 of this embodiment, from the first lens 10 to the second lens 20, there are a total of twelve curved surfaces on the object-side A surface and the image-side B surface of each lens. If each curved surface is aspherical, then these aspherical surfaces are defined by the following formula:

[0196] in:

[0197] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

[0198] Z represents the depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis I and the tangent plane that is tangent to the vertex on the optical axis I of the aspherical surface).

[0199] R represents the radius of curvature of the lens surface near the optical axis I;

[0200] K is the conic constant;

[0201] a i Let be the i-th order aspherical coefficient.

[0202] The optical data of the optical imaging lens 100 in the first embodiment is shown in Figure 4, and the aspherical data is shown in Figure 5. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all expressed in millimeters (mm). In this embodiment, f = 5.89 mm; HFOV = 40.8°; FNO = 1.68-2.78.

[0203] And, (EPDmax-EPDmin) / EPDmax=0.39; f / f2=-0.46; f3 / f=6.9; TTL / (R62 / R11)=10.10; EPDmax*tan(HFOV)=3.01; Dstop / sag11=0.38; TTL / ImagH=1 .40; f1 / R11-f6 / R62=4.71; F1 / (F4+F5)=-0.17; (CT2+CT3) / DT23=1.88; (CT4) / (CT5-CT6)=1.81; |Sag51 / CT5|+|Sag62 / CT6|=1.42; Td / ∑CT=1.72.

[0204] Please refer to Figure 6 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the large aperture state; and please refer to Figure 7 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the large aperture state; please refer to Figure 8 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the small aperture state; and please refer to Figure 9 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the small aperture state.

[0205] Example 2

[0206] Please refer to Figures 10 to 15 for an example of a second embodiment of the optical imaging lens 100 of this application.

[0207] In this embodiment, the optical imaging lens 100 comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, and a sixth lens 60 arranged sequentially along the direction from the object side A to the image side B, totaling six lenses with refractive indices, a variable aperture 30, and an image plane 40.

[0208] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0209] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0210] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is convex. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0211] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is convex, and the image-side surface E42 of the fourth lens 40 is concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0212] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0213] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0214] The optical data of the optical imaging lens 100 in the second embodiment is shown in Figure 9, and the aspherical data is shown in Figure 10. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all in millimeters (mm). In this embodiment, f = 5.66 mm; HFOV = 41.6°; FNO = 1.68-2.80.

[0215] And, (EPDmax-EPDmin) / EPDmax=0.40; f / f2=-0.37; f3 / f=3.95; TTL / (R62 / R11)=11.10; EPDmax*tan(HFOV)=2.99; Dstop / sag11=0.74; TTL / ImagH=1 .40; f1 / R11-f6 / R62=4.82; F1 / (F4+F5)=-0.30; (CT2+CT3) / DT23=2.15; (CT4) / (CT5-CT6)=1.50; |Sag51 / CT5|+|Sag62 / CT6|=1.03; Td / ∑CT=1.60.

[0216] Please refer to Figure 12 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is large; and please refer to Figure 13 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is large; please refer to Figure 14 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is small; and please refer to Figure 15 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is small.

[0217] Example 3

[0218] Please refer to Figures 16 to 21 for an example of a third embodiment of the optical imaging lens 100 of this application.

[0219] In this embodiment, the optical imaging lens 100 comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, and a sixth lens 60 arranged sequentially along the direction from the object side A to the image side B, totaling six lenses with refractive indices, a variable aperture 30, and an image plane 40.

[0220] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0221] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0222] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is convex. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0223] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is convex, and the image-side surface E42 of the fourth lens 40 is concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0224] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0225] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0226] The optical data of the optical imaging lens 100 in the third embodiment is shown in Figure 16, and the aspherical data is shown in Figure 17. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all in millimeters (mm). In this embodiment, f = 5.89 mm; HFOV = 40.8°; FNO = 1.68-2.78.

[0227] And, (EPDmax-EPDmin) / EPDmax=0.40; f / f2=-0.44; f3 / f=8.08; TTL / (R62 / R11)=10.44; EPDmax*tan(HFOV)=2.98; Dstop / sag11=0.20; TTL / ImagH=1 .40; f1 / R11-f6 / R62=4.77; F1 / (F4+F5)=-0.16; (CT2+CT3) / DT23=1.55; (CT4) / (CT5-CT6)=1.91; |Sag51 / CT5|+|Sag62 / CT6|=1.38; Td / ∑CT=1.73.

[0228] Please refer to Figure 18 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is large; and please refer to Figure 19 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is large; please refer to Figure 20 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is small; and please refer to Figure 21 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is small.

[0229] Example 4

[0230] Please refer to Figures 22 to 27 for an example of a fourth embodiment of the optical imaging lens 100 of this application.

[0231] In this embodiment, the optical imaging lens 100 comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, and a sixth lens 60 arranged sequentially along the direction from the object side A to the image side B, totaling six lenses with refractive indices, a variable aperture 30, and an image plane 40.

[0232] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0233] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0234] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is convex. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0235] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is convex, and the image-side surface E42 of the fourth lens 40 is concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0236] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0237] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0238] The optical data of the optical imaging lens 100 in the fourth embodiment is shown in Figure 22, and the aspherical data is shown in Figure 23. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all in millimeters (mm). In this embodiment, f = 5.89 mm; HFOV = 40.8°; FNO = 1.68-2.78.

[0239] And, (EPDmax-EPDmin) / EPDmax=0.41; f / f2=-0.35; f3 / f=6.41; TTL / (R62 / R11)=10.76; EPDmax*tan(HFOV)=2.98; Dstop / sag11=0.82; TTL / ImagH=1 .36; f1 / R11-f6 / R62=4.92; F1 / (F4+F5)=-0.18; (CT2+CT3) / DT23=1.89; (CT4) / (CT5-CT6)=1.48; |Sag51 / CT5|+|Sag62 / CT6|=1.76; Td / ∑CT=1.70.

[0240] Please refer to Figure 24 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is large; and please refer to Figure 25 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is large; please refer to Figure 26 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is small; and please refer to Figure 27 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is small.

[0241] Example 5

[0242] Please refer to Figures 28 to 33 for an example of a fifth embodiment of the optical imaging lens 100 of this application.

[0243] In this embodiment, the optical imaging lens 100 comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, and a sixth lens 60 arranged sequentially along the direction from the object side A to the image side B, totaling six lenses with refractive indices, a variable aperture 30, and an image plane 40.

[0244] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0245] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0246] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is concave. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0247] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is convex, and the image-side surface E42 of the fourth lens 40 is concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0248] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0249] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0250] The optical data of the optical imaging lens 100 in the fifth embodiment is shown in Figure 28, and the aspherical data is shown in Figure 29. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all in millimeters (mm). In this embodiment, f = 5.91 mm; HFOV = 40.3°; FNO = 1.69-2.81.

[0251] And, (EPDmax-EPDmin) / EPDmax=0.40; f / f2=-0.48; f3 / f=9.94; TTL / (R62 / R11)=10.55; EPDmax*tan(HFOV)=2.95; Dstop / sag11=0; TTL / ImagH=1. 40; f1 / R11-f6 / R62=4.79; F1 / (F4+F5)=-0.13; (CT2+CT3) / DT23=1.73; (CT4) / (CT5-CT6)=1.74; |Sag51 / CT5|+|Sag62 / CT6|=1.84; Td / ∑CT=1.79.

[0252] Please refer to Figure 30 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is large; and please refer to Figure 31 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is large; please refer to Figure 32 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the aperture is small; and please refer to Figure 33 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the aperture is small.

[0253] Example 6

[0254] Please refer to Figures 34 to 39 for an example of a sixth embodiment of the optical imaging lens 100 of this application.

[0255] In this embodiment, the optical imaging lens 100 comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, and a sixth lens 60 arranged sequentially along the direction from the object side A to the image side B, totaling six lenses with refractive indices, a variable aperture 30, and an image plane 40.

[0256] The first lens 10 has positive optical power. The object-side surface E11 of the first lens 10 is convex, and the image-side surface E12 of the first lens 10 is concave. Both the object-side surface E11 and the image-side surface E12 of the first lens 10 are aspherical, but this is not a limitation.

[0257] The second lens 20 has negative optical power. The object-side surface E21 of the second lens 20 is convex, and the image-side surface E22 of the second lens 20 is concave. Both the object-side surface E21 and the image-side surface E22 of the second lens 20 are aspherical, but this is not a limitation.

[0258] The third lens 30 has positive optical power. The object-side surface E31 of the third lens 30 is convex, and the image-side surface E32 of the third lens 30 is convex. Both the object-side surface E31 and the image-side surface E32 of the third lens 30 are aspherical, but this is not a limitation.

[0259] The fourth lens 40 has negative optical power. The object-side surface E41 of the fourth lens 40 is concave, and the image-side surface E42 of the fourth lens 40 is also concave. Both the object-side surface E41 and the image-side surface E42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0260] The fifth lens 50 has positive optical power. The object-side surface E51 of the fifth lens 50 is convex, and the image-side surface E52 of the fifth lens 50 is also convex. Both the object-side surface E51 and the image-side surface E52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0261] The sixth lens 60 has negative optical power. The object-side surface E61 of the sixth lens 60 is convex, and the image-side surface E62 of the sixth lens 60 is concave. Both the object-side surface E61 and the image-side surface E62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0262] The optical data of the optical imaging lens 100 in the sixth embodiment is shown in Figure 34, and the aspherical data is shown in Figure 35. In the optical imaging lens 100 of this embodiment, the ratio of the focal length to the entrance pupil diameter (f-number) of the overall optical imaging lens 100 is FNO, the entrance pupil diameter of the optical imaging lens 100 is EPD, the field of view (FOV), the total effective focal length f of the optical imaging lens 100, and the distance TTL between the object surface E11 of the first lens 10 and the image surface 40 along the optical axis I direction are all in millimeters (mm). In this embodiment, f = 5.72 mm; HFOV = 41.3°; FNO = 1.68-2.84.

[0263] And, (EPDmax-EPDmin) / EPDmax=0.41; f / f2=-0.30; f3 / f=2.88; TTL / (R62 / R11)=10.97; EPDmax*tan(HFOV)=3.04; Dstop / sag11=0.76; TTL / ImagH=1 .39; f1 / R11-f6 / R62=4.99; F1 / (F4+F5)=-0.67; (CT2+CT3) / DT23=1.80; (CT4) / (CT5-CT6)=1.39; |Sag51 / CT5|+|Sag62 / CT6|=1.26; Td / ∑CT=1.70.

[0264] Please refer to Figure 36 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the large aperture state; and please refer to Figure 37 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the large aperture state; please refer to Figure 38 for the astigmatic field curves of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the small aperture state; and please refer to Figure 39 for the distortion aberration of the optical imaging lens 100 on the image plane 40 when the optical imaging lens 100 is in the small aperture state.

Claims

1. An optical imaging lens, characterized in that, From the object side to the image side, the optical imaging lens includes: A first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave; A second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; A third lens with positive optical power. A fourth lens with negative optical power; the image-side surface of the fourth lens is concave. A fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex and the image-side surface of the fifth lens is convex; A sixth lens with negative optical power, wherein the object-side surface of the sixth lens is convex and the image-side surface of the sixth lens is concave; The maximum entrance pupil diameter of the optical imaging lens is EPDmax, and the minimum entrance pupil diameter of the optical imaging lens is EPDmin, satisfying (EPDmax-EPDmin) / EPDmax>0.

35.

2. The optical imaging lens according to claim 1, characterized in that: The distance Dtstop between the maximum and minimum aperture positions of the optical imaging lens along the optical axis, and the maximum distance sag11 from the intersection of the object side surface of the first lens and the optical axis to any point on the object side surface of the first lens along the optical axis, satisfy 0≤Dstop / sag11<0.

9.

3. The optical imaging lens according to claim 1, characterized in that: The effective focal length of the second lens is f2, and the total effective focal length of the optical imaging lens is f -0.

5. <f / f2<-0.2。 4. The optical imaging lens according to claim 1, characterized in that: The effective focal length of the third lens is f3, and the total effective focal length of the optical imaging lens is f2.

5. <f3 / f<10。 5. The optical imaging lens according to claim 1, characterized in that: The distance from the object side surface to the imaging surface of the first lens in the optical imaging lens along the optical axis is TTL, the radius of curvature of the object side surface of the first lens is R11, and the radius of curvature of the image side surface of the sixth lens is R62. 10 <TTL / (R62 / R11)<11.5。 6. The optical imaging lens according to claim 1, characterized in that: The maximum half field of view of the optical imaging lens is HFOV; EPDmax*tan(HFOV)>2.

9.

7. The optical imaging lens according to claim 1, characterized in that: The distance from the object side of the first lens of the optical imaging lens to the imaging surface in the optical axis direction is TTL; half the diagonal length of the effective pixel area on the imaging surface of the photographic lens is ImgH; TTL / ImagH≤1.

4.

8. The optical imaging lens according to claim 1, characterized in that: The effective focal length of the first lens is f1, the effective focal length of the sixth lens is f6, the radius of curvature of the object-side surface of the first lens is R11, and the radius of curvature of the image-side surface of the sixth lens is R62; 4.5 <f1 / R11-f6 / R62<5。 9. The optical imaging lens according to claim 1, characterized in that: The effective focal length of the first lens is f1, the effective focal length of the fourth lens is f4, and the effective focal length of the fifth lens is f5; -1 <F1 / (F4+F5)<0。 10. The optical imaging lens according to claim 1, characterized in that: The center thickness of the second lens on the optical axis is CT2, the center thickness of the third lens on the optical axis is CT3, and the distance between the image side of the second lens and the object side of the third lens on the optical axis is DT23; 1.5 < (CT2 + CT3) / DT23 < 2.

5.

11. The optical imaging lens according to claim 1, characterized in that: The center thickness of the fourth lens on the optical axis is CT4, the center thickness of the fifth lens on the optical axis is CT5, and the center thickness of the sixth lens on the optical axis is CT6; 1.3 < (CT4) / (CT5-CT6) < 2.

12. The optical imaging lens according to claim 1, characterized in that: The maximum distance from the point where the object side of the fifth lens intersects the optical axis to any point on the object side of the fifth lens in the optical axis direction is Sag51. The maximum distance from the point where the image side of the sixth lens intersects the optical axis to any point on the image side of the sixth lens in the optical axis direction is Sag62. The center thickness of the fifth lens on the optical axis is CT5, and the center thickness of the sixth lens on the optical axis is CT6. 1<|Sag51 / CT5|+|Sag62 / CT6|<2.

13. The optical imaging lens according to claim 1, characterized in that: The maximum distance along the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens is Td, and the total thickness along the optical axis of all lenses in the optical imaging lens is ∑CT; 1.5 <Td / ∑CT<1.8。 14. The optical imaging lens according to any one of claims 1 to 13, characterized in that: The object-side surface of the third lens is convex, and the image-side surface of the third lens is convex; or, The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave; and / or, The object-side surface of the fourth lens is convex; or, The object-side surface of the fourth lens is concave.

15. A camera module, characterized in that: Includes an optical imaging lens as described in any one of claims 1 to 14 and a variable aperture, the variable aperture being used to adjust the amount of light passing through the optical imaging lens.

16. A terminal device, characterized in that: Includes the camera module as described in claim 15.

Images