Optical imaging lens, optical imaging apparatus and electronic device

Abstract

The application discloses an optical imaging lens, an optical imaging device and an electronic device. The space layout relationship between multiple lenses is accurately controlled, and the focal length of the overall lens group is optimized and modulated. On the premise of ensuring large-aperture performance and wide-angle imaging characteristics, the total length of the optical imaging lens is significantly reduced, and the established imaging height requirement is maintained and the overall imaging quality is improved.

Description

Technical Field

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

[0002] People are becoming increasingly reliant on portable devices such as mobile phones, tablets, and laptops. Among these devices, cameras are an indispensable component for recording images in various consumer electronics products. With the rise of machine vision and artificial intelligence, cameras can also serve as the "eyes" of these devices to perceive their surroundings, identify or analyze objects, and build a bridge between the real world and machine communication.

[0003] With the consumer electronics market's continued pursuit of lightweight, miniaturization, and high performance, optical lens systems, as their core components, face multiple technical challenges in the design field. This is not only reflected in the continuous need to reduce the overall optical length, but also in the design of large apertures to improve light intake efficiency, expand the field of view to obtain a wider imaging range, and improve imaging resolution to meet high image quality requirements. However, these technical indicators need to be weighed and traded in the actual design process. Especially considering the feasibility of actual production and manufacturing, how to achieve the optimal configuration of these performance indicators within a limited design space has become one of the most challenging issues in the field of modern optical system design. Summary of the Invention

[0004] This application provides an optical imaging lens, an optical imaging device, and an electronic device, which achieves a significant reduction in the total length of the optical imaging lens while ensuring large aperture performance and wide-angle imaging characteristics, by precisely controlling the spatial layout relationship between multiple lenses and optimizing the focal length of the overall lens group, while maintaining the predetermined imaging height requirements and improving the overall imaging quality.

[0005] In a first aspect, embodiments of this application provide an optical imaging lens, comprising: a first lens, close to the object side and having positive refractive power; a second lens, adjacent to the first lens and having negative refractive power; a third lens, adjacent to the second lens and having positive refractive power; and a fourth lens, adjacent to the third lens and close to the image side, and having negative refractive power; an imaging plane, which is an optical image plane perpendicular to the optical axis; wherein the first lens, the second lens, the third lens, and the fourth lens are sequentially arranged along the optical axis, and each of the first lens to the fourth lens has an object-side surface facing the object side and an image-side surface facing the image side; the distance on the optical axis from the object-side surface of the first lens to the imaging plane is TTL, and TTL is less than a preset distance value. Further, the preset distance value is 1.58 mm.

[0006] In this implementation, the optical imaging lens enhances its light focusing ability by designing the first lens with a positive refractive power structure, which improves the amount of light entering the first lens and thus increases the overall light intake of the optical imaging lens, thereby improving the overall quality of optical imaging. Simultaneously, the optical imaging lens employs a four-lens refractive power architecture design of "positive-negative-positive-negative," which not only effectively eliminates optical aberrations such as field curvature and chromatic aberration, but also significantly reduces the overall length of the optical imaging lens while ensuring good imaging characteristics by precisely controlling the spatial relationship between multiple lenses and optimizing the overall lens group focal length parameters, thereby achieving a miniaturized design of the optical imaging lens.

[0007] In some possible implementations, the optical imaging lens includes: a filter disposed between the fourth lens and the imaging plane and arranged along the optical axis, the filter having an object-side surface facing the object side and an image-side surface facing the image side.

[0008] Secondly, embodiments of this application provide an optical imaging device, comprising: an optical imaging lens as described above; and an image sensing element disposed on the imaging surface of the optical imaging lens, wherein the surface of the image sensing element faces the imaging surface.

[0009] In this implementation, by adopting an innovative optical imaging lens design in the optical imaging device, the total length of the optical imaging lens is effectively reduced while ensuring excellent imaging quality. This structural optimization not only significantly reduces the overall volume of the optical imaging device, but also greatly reduces the installation space required for practical applications, thereby achieving the miniaturization design goal of the optical imaging device.

[0010] Thirdly, embodiments of this application provide an electronic device that includes the aforementioned optical imaging device.

[0011] In this implementation, by miniaturizing the optical imaging device, the space occupied by the optical imaging device in the electronic device is reduced, which is beneficial to improving the space utilization of the electronic device and helps to achieve a thinner and lighter design.

[0012] This application has at least the following beneficial effects: By precisely controlling the spatial arrangement of multiple lenses and optimizing the focal length of the overall lens group, the embodiments of this application significantly reduce the overall length of the optical imaging lens while ensuring large aperture performance and wide-angle imaging characteristics. Simultaneously, it maintains the predetermined image height requirements and improves the overall image quality, thereby achieving the goal of miniaturization. Furthermore, this application ensures the manufacturing quality of the optical imaging lens by selecting lens materials suitable for injection molding, thereby achieving the expected optical performance indicators. Attached Figure Description

[0013] The above and other aspects, features, and advantages of certain embodiments of this application will become more apparent from the following description taken in conjunction with the accompanying drawings, wherein:

[0014] Figure 1 This is a schematic diagram of the optical imaging lens and optical imaging device according to the first embodiment of this application.

[0015] Figure 2 The MTF curves of the optical imaging lens of the first embodiment of this application at 0.0 field of view, 0.3 field of view, 0.7 field of view, and 1.0 field of view.

[0016] Figure 3 The relative illumination of the optical imaging lens in the first embodiment of this application.

[0017] Figures 4A to 4C These are the tangential field curvature, sagittal field curvature, and distortion of the optical imaging lens in the first embodiment of this application.

[0018] Figure 5 Lateral chromatic aberration of the optical imaging lens in the first embodiment of this application.

[0019] Figure 6 This is a schematic diagram of the optical imaging lens and optical imaging device according to the second embodiment of this application.

[0020] Figure 7 The MTF curves of the optical imaging lens of the second embodiment of this application at 0.0 field of view, 0.3 field of view, 0.7 field of view, and 1.0 field of view.

[0021] Figure 8 The relative illumination of the optical imaging lens in the second embodiment of this application.

[0022] Figures 9A to 9C The tangential field curvature, sagittal field curvature, and distortion of the optical imaging lens of the second embodiment of this application are respectively.

[0023] Figure 10 Lateral chromatic aberration of the optical imaging lens in the second embodiment of this application.

[0024] Figure 11 This is a schematic diagram of the optical imaging lens and optical imaging device according to the third embodiment of this application.

[0025] Figure 12 The MTF curves of the optical imaging lens of the third embodiment of this application at 0.0 field of view, 0.3 field of view, 0.7 field of view, and 1.0 field of view.

[0026] Figure 13 The relative illumination of the optical imaging lens in the third embodiment of this application.

[0027] Figures 14A to 14C These are the tangential field curvature, sagittal field curvature, and distortion of the optical imaging lens in the third embodiment of this application.

[0028] Figure 15 Lateral chromatic aberration of the optical imaging lens in the third embodiment of this application.

[0029] Figure 16 This is a schematic diagram of the optical imaging lens and optical imaging device according to the fourth embodiment of this application.

[0030] Figure 17 The MTF curves of the optical imaging lens of the fourth embodiment of this application at 0.0 field of view, 0.3 field of view, 0.7 field of view, and 1.0 field of view.

[0031] Figure 18 The relative illumination of the optical imaging lens in the fourth embodiment of this application.

[0032] Figures 19A to 19C The tangential field curvature, sagittal field curvature, and distortion of the optical imaging lens of the fourth embodiment of this application are respectively.

[0033] Figure 20 Lateral chromatic aberration of the optical imaging lens in the fourth embodiment of this application.

[0034] Figure 21 This is a schematic diagram of the optical imaging lens and optical imaging device according to the fifth embodiment of this application.

[0035] Figure 22 The MTF curves of the optical imaging lens of the fifth embodiment of this application at 0.0 field of view, 0.3 field of view, 0.7 field of view, and 1.0 field of view.

[0036] Figure 23 The relative illumination of the optical imaging lens in the fifth embodiment of this application.

[0037] Figures 24A to 24C The tangential field curvature, sagittal field curvature, and distortion of the optical imaging lens of the fifth embodiment of this application are respectively.

[0038] Figure 25 Lateral chromatic aberration of the optical imaging lens in the fifth embodiment of this application.

[0039] Figure 26 This is a schematic diagram of the electronic device of this application.

[0040] Some of the reference numerals in the attached figures are explained below:

[0041] 100, 200, 300, 400, 500: Aperture;

[0042] 110, 210, 310, 410, 510: First lens;

[0043] 111, 211, 311, 411, 511: Object-side surface of the first lens;

[0044] 112, 212, 312, 412, 512: Image-side surface of the first lens;

[0045] 120, 220, 320, 420, 520: Second lens;

[0046] 121, 221, 321, 421, 521: Object-side surface of the second lens;

[0047] 122, 222, 322, 422, 522: Image-side surface of the second lens;

[0048] 130, 230, 330, 430, 530: Third lens;

[0049] 131, 231, 331, 431, 531: Object-side surface of the third lens;

[0050] 132, 232, 332, 432, 532: Image-side views of the third lens;

[0051] 140, 240, 340, 440, 540: Fourth lens;

[0052] 141, 241, 341, 441, 541: Object-side surface of the fourth lens;

[0053] 142, 242, 342, 442, 542: Image-side views of the fourth lens;

[0054] 150, 250, 350, 450, 550: Infrared filters;

[0055] 151, 251, 351, 451, 551: Object side of the infrared filter;

[0056] 152, 252, 352, 452, 552: Image side view of the infrared filter;

[0057] 160, 260, 360, 460, 560: Imaging plane;

[0058] 10, 20, 30, 40, 50: Optical imaging lenses;

[0059] 90: Image sensing element;

[0060] 1010: Optical imaging device;

[0061] 1000: Electronic devices. Detailed Implementation

[0062] In the following sections, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0063] However, this application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the application more thorough and complete and to fully convey the concept of the application to those skilled in the art. In several of the accompanying drawings, various thicknesses or dimensions of various components have been exaggerated for clarity and ease of illustration.

[0064] The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the application. As used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including” as used in this specification designate the presence of stated features, integrals, steps, operations, elements, components, and / or groups thereof, but do not exclude the presence or addition of one or more other features, multiple integrals, multiple steps, multiple operations, multiple elements, multiple components, and / or groups thereof.

[0065] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described.

[0066] Focal power, also known as refractive power, is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical refraction system to deflect light rays.

[0067] A lens or lens group with positive optical power (or positive refractive power) has a positive focal length and has the effect of converging light.

[0068] A lens or lens group with negative optical power (or negative refractive power) has a negative focal length and has the effect of diverging light.

[0069] Focal length, also known as focal length, is a measure in optical systems of the convergence or divergence of light. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a parallel beam of light from infinity converges to form a sharp image after being refracted by the lens or lens group. Focal length can be understood as the actual distance from the center of the lens to the image plane when the object is at infinity.

[0070] The object side is defined by the lens; the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0071] The image side is the side on which the image of the object is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

[0072] Aperture value, also known as F-number (Fno), is a relative value derived from the lens's focal length divided by the lens's entrance pupil diameter (the reciprocal of the relative aperture). The smaller the aperture value, the more light enters the lens in the same unit of time.

[0073] The imaging plane is located on the image side of all lenses in an optical lens, and is the surface on which light rays pass through each lens in the optical lens in sequence to form an image.

[0074] The optical axis is a perpendicular axis passing through the center of a lens. The lens optical axis is the axis passing through the centers of all the lenses in the lens. When light rays parallel to the optical axis enter a convex lens, an ideal convex lens should have all the light rays converging at a single point behind the lens; this point where all the light rays converge is called the focal point.

[0075] The focal point is the point where parallel light rays converge after being refracted by a lens or lens group.

[0076] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0077] 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 target 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 lower optical magnification.

[0078] The half-sensor diagonal IMGH (Image Height) represents half the diagonal length of the effective pixel area on the image sensor, which is the image height of the imaging surface.

[0079] Aberrations are the properties of an ideal optical system in the paraxial region. Paraxial rays emitted from a point on an object intersect the image plane at a single point (i.e., the paraxial image point). However, in reality, rays passing through different apertures of a lens rarely intersect perfectly at a single point. Instead, they deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0080] Longitudinal spherical aberration, also known as longitudinal chromatic aberration, positional chromatic aberration, or axial aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens images different wavelengths of light at different positions, causing the image-side focal planes of different colors of light to not coincide, resulting in the dispersion of polychromatic light.

[0081] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0082] The Meridian Plane is the plane formed by the principal ray (principal beam) of an off-axis object point and the optical axis.

[0083] The sagittal surface is the plane that passes through the principal ray (principal beam) of an off-axis object point and is perpendicular to the meridional plane.

[0084] Field curvature refers to the difference in optical axis between the position of the sharpest image point after rays from the off-center field of view pass through an optical lens assembly and the position of the sharpest image point in the center field of view. When a lens has field curvature, the intersection of the entire beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0085] Off-axis field of view refers to the field of view region where there is a certain angle between the light ray and the principal optical axis of the optical system.

[0086] This application provides an optical imaging lens comprising: a first lens, close to the object side and having positive refractive power; a second lens, adjacent to the first lens and having negative refractive power; a third lens, adjacent to the second lens and having positive refractive power; and a fourth lens, adjacent to the third lens and close to the image side, and having negative refractive power; and an imaging plane, which is an optical image plane perpendicular to the optical axis; wherein the first lens, second lens, third lens, and fourth lens are sequentially arranged along the optical axis, and each of the first to fourth lenses has an object-side surface facing the object side and an image-side surface facing the image side. The distance on the optical axis from the object-side surface of the first lens to the imaging plane (i.e., the total length of the optical imaging lens, hereinafter the same) is TTL, and TTL is less than a preset distance value. The preset distance value is 1.58 mm. Further, TTL satisfies the following condition: 1.40 mm ≤ TTL ≤ 1.58 mm. In other words, the distance TTL between the object surface of the first lens and the imaging surface on the optical axis can be, but is not limited to, 1.40 mm, or 1.42 mm, or 1.45 mm, or 1.464 mm, or 1.473 mm, or 1.49 mm, or 1.53 mm, or 1.551 mm, or 1.558 mm, or 1.56 mm, or 1.577 mm, or 1.58 mm, or other values ​​between 1.40 mm and 1.58 mm.

[0087] Furthermore, the optical imaging lens in this embodiment includes a filter disposed between the fourth lens and the imaging plane, and arranged along the optical axis. The filter has an object-side surface facing the object side and an image-side surface facing the image side. The filter is used to filter out unwanted wavelengths in the light, preventing the image sensing element (or sensor, hereinafter the same) from producing false colors or ripples, thereby improving its effective resolution and color reproduction. Exemplarily, the filter can be an infrared filter, the basic structure of which is achieved by depositing a specific optical thin film on the surface of a flat glass substrate. This coating layer can effectively block infrared spectra with wavelengths exceeding 650 nm, thereby not only effectively eliminating the interference of infrared radiation on imaging, but also significantly improving image quality and color reproduction. In this embodiment, the filter is a separate component. In some other embodiments, the filter structure can be omitted, and light filtering can be achieved by surface treatment or material treatment of at least one optical element of the optical imaging lens. This application does not strictly limit the specific embodiments of the structure or component used to achieve light filtering.

[0088] In some embodiments, the optical imaging lens of this application includes an aperture disposed on the object-side surface of the first lens. It should be noted that an aperture is an optical element that allows light to pass through only within a specific angular range. It not only controls the amount of light entering the lens, affecting exposure and depth of field, but also suppresses stray light to improve image quality. Since the principal ray must pass through the midpoint of the aperture (i.e., the intersection of the aperture and the optical axis), the aperture is configured to be positioned on the object-side and in front of the first lens. The advantage of this aperture configuration is that the aperture at the front of the lens allows the principal ray to enter the lens through the optical axis from the beginning, resulting in refraction. Compared to a lens group with the aperture at the rear, it can utilize a shorter distance to deflect the light to the specified image height within the same available space, thereby reducing the overall length of the optical imaging lens. It should be noted that, in this document, a lens group refers to a functional unit composed of multiple optical elements combined according to specific design requirements. In the embodiments of this application, the lens group includes a first lens, a second lens, a third lens, and a fourth lens.

[0089] In this application, the aperture radius (Stop Radius) satisfies: Stop Radius ≥ 0.28 mm. Furthermore, the optical imaging lens of this application adopts a large aperture design with an f / # of 2.0. Compared with the smaller f / # of 2.8, this aperture parameter has a larger aperture opening, which can obtain nearly twice the amount of light and has a better depth of field effect in close-up scenes, thereby providing superior optical performance.

[0090] It should be noted that as f / # decreases, the diffraction-limited cutoff frequency (f0) in the modulation transfer function (MTF) of the optical imaging lens can also be increased. c As shown in Formula 1 below.

[0091]

[0092] Among them, f c Here, f represents the cutoff frequency, λ represents the wavelength of the incident light, and f / #, or f-number, represents the relative aperture of the optical system. For example, using a wavelength of 555 nm, the cutoff frequencies with f / # of 2.8 and 2.0 are calculated to be 644 lp / mm and 900 lp / mm, respectively. When using an image sensing element (i.e., a sensor) with a pixel size of 1.0 μm, as described below, the corresponding Nyquist frequency (1 / 2 * pixel size) is 500 lp / mm. If this image sensing element is paired with an f / # of 2.8, it will be limited by the diffraction limit, making the modulation transfer function unable to meet performance requirements under high-frequency conditions. Therefore, in this application, by reducing f / # (i.e., increasing the aperture), the flexibility in subsequently selecting a high-pixel image sensing element can be increased.

[0093] In this application, the optical imaging lens includes a first lens, a second lens, a third lens, and a fourth lens, each of which has an object-side surface facing the object and an image-side surface facing the image. The first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, and the fourth lens has negative refractive power; that is, the refractive power of the first to fourth lenses in this optical imaging lens satisfies a "positive-negative-positive-negative" structure. Furthermore, the refractive indices of the materials of the first and second lenses are n1 and n2, respectively, and their Abbe numbers are υ1 and υ2, respectively. In some embodiments of this application, the refractive indices and Abbe numbers of the materials of the first and second lenses satisfy: n2>n1, υ1>υ2.

[0094] Furthermore, in this optical imaging lens design, the refractive powers of the first to fourth lenses satisfy a "positive-negative-positive-negative" architecture to effectively reduce aberrations. This design primarily focuses on two core objectives: field curvature elimination and chromatic aberration correction. Regarding field curvature elimination, it is necessary to minimize the Petzval Sum as much as possible, i.e., the smaller the Petzval Sum, the better, as shown in Equation 2 below.

[0095]

[0096] In Formula 2, D1, D2, etc., represent diopter, and n1, n2, etc., represent refractive index. This requires that, while maintaining a positive focal length (i.e., the sum of the diopter of all lenses must be greater than zero), the diopter can be canceled out by combining positive and negative lenses. Since a single material cannot effectively reduce the Petzval sum, it is necessary to use at least two materials with different refractive indices (n) in combination. In this application, the Petzval sum satisfies: 0.00 ≤ Petzval Sum ≤ 0.55, where Petzval Sum can be, but is not limited to, 0, 0.10, 0.25, 0.35, 0.45, 0.55, or other values ​​between 0 and 0.55. Regarding chromatic aberration correction, the key is to minimize the sum of the ratios of the diopter to the Abbe number (υ) of each lens, as shown in Formula 3 below.

[0097]

[0098] In Formula 3, D1, D2, etc., represent diopter, and υ1, υ2, etc., represent Abbe number. This also cannot be achieved with a single material; no matter how many lenses are used, it is difficult to obtain an ideal correction effect. Considering the inverse relationship between refractive index and Abbe number in material properties, achieving complete elimination of field curvature and chromatic aberration simultaneously is mathematically difficult; the only solution is to seek the optimal balance between the two through optimized design. In this application, this balance is achieved by using different refractive indices and thicknesses of materials to correct the optical path of light rays in each field of view. It should be noted that the thickness here refers to the corresponding thickness of light rays in each field of view as they pass through the lens.

[0099] In some embodiments, in order to ensure the rationality of the physical characteristics of the lenses in the optical system, it is necessary to further constrain the ratio between the edge thickness (ETHK) of each lens and the center thickness (CTHK) of the corresponding lens, as well as the relationship between the sum of the air gap thicknesses between each lens (ΣATHK=ATHK1+ATHK2+ATHK3+ATHK4+ATHK5) and the sum of the center thicknesses (ΣCTHK=CTHK1+CTHK2+CTHK3+CTHK4+CTHK5), so that they satisfy: 0.60≤CTHK / ETHK≤2.20, and 1.00≤ΣCTHK / ΣATHK≤2.00. In other words, in this application, the first lens has a center thickness of CTHK1 and an edge thickness of ETHK1 along the optical axis, the second lens has a center thickness of CTHK2 and an edge thickness of ETHK2 along the optical axis, the third lens has a center thickness of CTHK3 and an edge thickness of ETHK3 along the optical axis, the fourth lens has a center thickness of CTHK4 and an edge thickness of ETHK4 along the optical axis, and the filter has a center thickness of CTHK5 and an edge thickness of ETHK5 along the optical axis; and satisfies: 0.60 ≤ CTHK1 / ETHK1≤2.20, 0.60≤CTHK2 / ETHK2≤2.20, 0.60≤CTHK3 / ETHK3≤2.20, 0.60≤CTHK4 / ETHK4≤2.20, 0.60≤CTHK5 / ETHK5≤2.20, wherein the ratio of CTHK1 / ETHK1 can be, but is not limited to, 0.60, or 0.90, or 1.30, or 1.80, or 2.20, or other values ​​between 0.60 and 2.20. Similarly, the CTHK2 / ETHK2 ratio can be, but is not limited to, 0.60, 1.00, 1.40, 1.70, 2.20, or other values ​​between 0.60 and 2.20; the CTHK3 / ETHK3 ratio can be, but is not limited to, 0.60, 1.10, 1.50, 1.90, 2.20, or other values ​​between 0.60 and 2.20; the CTHK4 / ETHK4 ratio can be, but is not limited to, 0.60, 0.80, 1.30, 1.90, 2.20, or other values ​​between 0.60 and 2.20; and the CTHK5 / ETHK5 ratio can be, but is not limited to, 0.60, 1.20, 1.50, 1.80, 2.20, or other values ​​between 0.60 and 2.20. The ΣCTHK / ΣATHK ratio can be, but is not limited to, 1.00, 1.30, 1.50, 1.70, 1.90, 2.00, or other values ​​between 1.00 and 2.00. It should be noted that the center thickness of each lens mentioned above refers to the center lens thickness, and the sum of center thicknesses refers to the total center lens thickness, the same applies below.

[0100] Furthermore, in some embodiments, when the air gap thickness (i.e., ATHK2) between the second and third lenses on the optical axis and the half-field imaging image height (IMGH) satisfy the following relationship: 0.020≤ATHK2 / IMGH≤0.104, the distance between the second and third lenses can be effectively controlled and the overall lens focal length can be modulated, thereby effectively reducing the total length (TTL) of the optical imaging lens, while maintaining the required high imaging performance and further improving the overall imaging quality.

[0101] It should be noted that in these embodiments, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, satisfying the following conditions: 2.50 ≤ f1 + f3 ≤ 3.50, -9.70 ≤ f2 + f4 ≤ -5.00. The value of f1 + f3 can be, but is not limited to, 2.50, 2.70, 2.95, 3.10, 3.30, 3.50, or other values ​​between 2.50 and 3.50. Similarly, the value of f2 + f4 can be, but is not limited to, -9.70, -8.40, -7.30, -6.50, -5.00, or other values ​​between -9.70 and -5.00.

[0102] Furthermore, the design of optical imaging lenses involves many key parameters that require precise weighing and in-depth consideration. Among these, focal length is not only a crucial factor affecting the image quality of the entire optical system but also a core element determining the rationality of the system's optical path layout. Specifically, the back focal length (BFL), as an objective physical quantity, directly influences the spatial layout and assembly requirements of various optical components within the optical system, and also largely determines the structural compactness and practical performance of the entire optical system. Correspondingly, the effective focal length (EFL) reflects the basic imaging characteristics of the optical system at a more macroscopic system level. This parameter not only plays a key role in determining the magnification of the optical system but also has a decisive influence on important optical parameters such as the field of view (FOV), thus possessing particular importance in practical applications. Reasonable configuration and optimization of these two core parameters directly determine the overall performance of the entire optical system. In some embodiments of this application, the ratio of the back focal length BFL to the effective focal length EFL of the optical imaging lens satisfies: 0.07≤BFL / EFL≤0.16, wherein the ratio of BFL / EFL can be, but is not limited to, 0.07, 0.09, 0.13, 0.14, 0.16, or other values ​​between 0.07 and 0.16.

[0103] Furthermore, in the design process of optical imaging lenses, the quantitative description and standardized characterization of key parameters are of great significance. Among them, the effective focal length (EFL) of an optical imaging lens, as an important parameter characterizing the basic imaging characteristics and magnification of the optical system, together with the entrance pupil diameter (EPD), a core indicator that determines the system's luminous flux and diffraction-limited resolution, constitute the fundamental elements for evaluating the performance of the optical system. These two parameters play a decisive role in practical applications, directly affecting the imaging quality and actual performance of the optical system through reasonable configuration. In some embodiments, the ratio of the effective focal length (EFL) to the entrance pupil diameter (EPD) of the optical imaging lens satisfies: 1.00 ≤ EFL / EPD ≤ 2.00, where the ratio of EFL / EPD can be, but is not limited to, 1.00, 1.20, 1.50, 1.80, 2.00, or other values ​​between 1.00 and 2.00.

[0104] Furthermore, in the design of optical imaging lenses, the field of view (FOV) is a core indicator for measuring the imaging range of the system. Together with the effective focal length (EFL) and entrance pupil diameter (EPD), it constitutes the three core parameters characterizing the basic properties of an optical system. These parameters are closely interrelated. The FOV directly determines the observation range and image coverage area of ​​the optical system, and along with the effective focal length, it affects important optical characteristics such as depth of field and image plane curvature. Simultaneously, it works with the entrance pupil diameter to influence the illuminance distribution and edge light energy utilization of the optical system. Therefore, in the actual design of optical imaging lenses, the matching relationship of these three parameters must be comprehensively considered.

[0105] In some embodiments, the field of view (FOV) of the optical imaging lens satisfies: 82.00° ≤ FOV ≤ 120.00°, wherein the field of view (FOV) can be, but is not limited to, 82.00°, or 95.00°, or 100.50°, or 110.50°, or 120.00°, or other values ​​between 82.00° and 120.00°.

[0106] In some embodiments of this application, the aperture of the first lens is less than or equal to 0.73 mm, the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave near the optical axis. Further, the aperture of the first lens is greater than or equal to 0.57 mm and less than or equal to 0.73 mm. The aperture of the first lens can be, but is not limited to, 0.57 mm, 0.61 mm, 0.63 mm, 0.67 mm, 0.73 mm, or other values ​​between 0.57 mm and 0.73 mm.

[0107] In some embodiments, the aperture of the second lens is less than or equal to 0.80 mm, the object-side surface of the second lens is concave, the image-side surface of the second lens is concave near the optical axis, and the image-side surface of the second lens has at least two first inflection points, wherein the first inflection points are located at a position greater than 0.68 times the aperture. Further, the aperture of the second lens is greater than or equal to 0.58 mm and less than or equal to 0.80 mm. The aperture of the second lens can be, but is not limited to, 0.58 mm, 0.61 mm, 0.64 mm, 0.67 mm, 0.75 mm, 0.80 mm, or other values ​​between 0.58 mm and 0.80 mm.

[0108] In some embodiments, the third lens is crescent-shaped, its aperture is less than or equal to 1.08 mm, its object-side surface is concave, its image-side surface is convex near the optical axis, and its image-side surface has at least two second inflection points, wherein the second inflection points are located at a position greater than 0.46 times the aperture. Further, the aperture of the third lens is greater than or equal to 0.78 mm and less than or equal to 1.08 mm. The aperture of the third lens can be, but is not limited to, 0.78 mm, 0.83 mm, 0.89 mm, 0.93 mm, 1.01 mm, 1.08 mm, or other values ​​between 0.78 mm and 1.08 mm.

[0109] In some embodiments, the fourth lens is gull-wing shaped, and its aperture is less than or equal to 1.88 mm. The object-side and image-side surfaces of the fourth lens each have at least four third inversion points and two fourth inversion points, wherein the third inversion points are located at less than 0.30 times the aperture and greater than 0.65 times the aperture, and the fourth inversion points are located at greater than 0.25 times the aperture. Further, the aperture of the fourth lens is greater than or equal to 1.47 mm and less than or equal to 1.88 mm. The aperture of the fourth lens can be, but is not limited to, 1.47 mm, 1.54 mm, 1.66 mm, 1.78 mm, 1.83 mm, 1.88 mm, or other values ​​between 1.47 mm and 1.88 mm.

[0110] In this application, the object-side and image-side surfaces of the first to fourth lenses are all aspherical. This design effectively eliminates aberrations and reduces the number of lenses used, thus shortening the overall length of the optical imaging lens. Each aspherical shape satisfies the following even-order aspherical formula (Formula 4):

[0111]

[0112] Where, c is the reciprocal of the curvature radius of the aspherical surface, k is the conic coefficient, r is the radial coordinate along the lens length direction, α i is the 2i-th order aspherical coefficient (for example: α2 is the 4th order aspherical coefficient, α3 is the 6th order aspherical coefficient, and so on...), 2i is the high power of the aspherical surface, N is a natural number, z is along the optical axis direction, starting from the central optical axis, at the position with a height radius of r, the distance sagitta of this coordinate point from the vertex of the aspherical surface.

[0113] In some embodiments, when simultaneously weighing the ability of a specific lens aspherical type to correct large field aberration and the actual manufacturing difficulty, it is necessary to achieve a balance by controlling the thickness, curvature magnitude, and positive and negative characteristics of the local surface at different fields. Specifically, this kind of balance is mainly reflected in the limitations of the following two key ratios: The ratio of the central thickness (CTHK3) of the third lens to the thickness (HEP3_0.5X) of the third lens at a position parallel to the optical axis and at 0.5 times the clear aperture satisfies: 1. < CTHK3 / HEP3_0.5X < 1.4; The ratio of the thickness (HEP4_0.7X) of the fourth lens at 0.7 times the clear aperture parallel to the optical axis to its central thickness (CTHK4) satisfies: 1.00 < HEP4_0.7X / CTHK4 < 1.92, where the ratio of CTHK3 / HEP3_0.5X can be but is not limited to 1.1, or 1.2, or 1.28, or 1.30, or 1.36, or 1.39, or other values between 1.0 and 1.4, and the ratio of HEP4_0.7X / CTHK4 can be but is not limited to 1.11, or 1.23, or 1.35, or 1.47, or 1.54, or 1.68, or​​​​​​​​​​Schematic diagram of the optical imaging lens 10 and the optical imaging device of the first embodiment. The f / # (i.e., F-number) of the optical imaging lens 10 is 1.98, and it sequentially includes a front aperture 100 with a direct size of 0.596 mm, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, an infrared filter 150, and a planar imaging surface 160 from the object side to the image side.

[0117] Specifically, the first lens 110 has a positive refractive power, and the magnitude of this refractive power affects the total length TTL of the entire optical imaging lens. The first lens 110 is made of plastic. The object side surface 111 of the first lens 110 is convex, and the image side surface 112 of the first lens 110 is concave near the optical axis and has 2 inflection points at 0.59 times the clear aperture.

[0118] The second lens 120 has a negative refractive power and is made of plastic with a high refractive index (n = 1.660) and a low Abbe number (υ = 20.370). It is complementary to the first lens 110 with a positive refractive power to compensate for the aberration generated by the first lens 110. The object side surface 121 of the second lens 120 is concave, and the image side surface 122 of the second lens 120 is convex near the optical axis and has 2 inflection points at 0.59 times the clear aperture.

[0119] The third lens 130 is a meniscus-shaped lens with a positive refractive power. It forms a synergistic effect with the first lens 110 through its unique morphological structure. It can not only effectively share and balance the positive refractive power distribution in the optical system, but also improve the light path control ability of the overall optical system and achieve a more ideal imaging effect. The object side surface 131 of the third lens 130 is concave, and the image side surface 132 of the third lens 130 is convex and has 2 inflection points at 0.78 times the clear aperture. The ratio of the central thickness (CTHK3) of the third lens 130 to the thickness at 0.5 times the clear aperture (HEP3_0.5X) parallel to the optical axis of the third lens 130 satisfies: 1.0 < CTHK3 / HEP3_0.5X < 1.4. Further, in the first embodiment of the present application, CTHK3 / HEP3_0.5X = 1.28, making it comply with the plastic injection molding manufacturing specification.

[0120] The fourth lens 140 is a gull-wing shaped lens with negative refractive power. This negative refractive power helps to shorten its back focal length, thus reducing the total length (TTL) of the optical imaging lens. The object-side surface 141 of the fourth lens 140 has four inflection points located at 0.25 and 0.69 times the aperture, respectively, while the image-side surface 142 has two inflection points at 0.28 times the aperture. This gull-wing shape design effectively suppresses the incident angle of off-axis field rays, further correcting aberrations in the off-axis field of view. The ratio of the thickness of the fourth lens 140 at 0.7 times the aperture (HEP4_0.7X) parallel to the optical axis to its center thickness (CTHK4) satisfies: HEP4_0.7X / CTHK4 = 1.47, meeting manufacturing requirements.

[0121] The infrared filter 150 has an object-side surface 151 and an image-side surface 152, both of which are planar. The infrared filter 150 can effectively block the infrared spectrum, thereby effectively eliminating the interference of infrared radiation on imaging, and can also significantly improve image quality and color reproduction.

[0122] In the first embodiment, the radius of curvature, thickness, refractive index of the material used, and Abbe number of each lens are shown in Table 1. In Table 1, the thickness value in the row with 111 is the center thickness of the first lens 110, the value in the row with 112 is the air gap thickness between the first lens 110 and the second lens 120, and so on. The relevant conic and aspherical coefficient values ​​of each aspherical lens are shown in Table 2.

[0123] Table 1:

[0124]

[0125] Table 2:

[0126]

[0127]

[0128] It should be noted that, in order to demonstrate the characteristics of the optical imaging lens of this application, the resolution and sharpness of the lens group can be evaluated by the Modulation Transfer Function (MTF) characteristics. The vertical axis represents contrast, and the horizontal axis represents spatial frequency. The unit is expressed as line pair divided by millimeters (line pair / mm). The meaning of the MTF characteristics is as follows: the higher the low-frequency MTF value, the better the contrast; the better the sharpness and the clearer the image details, the higher the MTF value at high frequencies. Generally, it is more difficult to obtain fine reproduction in the edge area than in the center area. Furthermore, in evaluating the resolving power and sharpness of the lens assembly, the image sensing element 90 (i.e., the sensor) is selected with a size of 1.12 μm. Its corresponding Nyquist frequencies (1 / 2 * pixel size) are approximately 440 lp / mm, 220 lp / mm, and 110 lp / mm for the full frequency, half frequency, and quarter frequency, respectively. In the embodiments below, the optical axis, 0.3 field of view, 0.7 field of view, and 1.0 field of view are selected as representatives to determine whether the optical imaging lens performance in the embodiments below meets the requirements. For details, please refer to the following description.

[0129] Furthermore, in this application, the modulation transfer function (MTF) value on the optical axis is MTF_0.0F, the MTF value at a 0.7 field of view is MTF_0.7F, and the MTF value at a 1.0 field of view is MTF_1F, and at any spatial frequency, it satisfies: MTF_1.0F < MTF_0.7F. <MTF_0.0F。

[0130] In the first embodiment, the MTF curves for each field of view are as follows: Figure 2 As shown, the MTF220 value is greater than 0.39 at half-space frequency in the main imaging area (within 0.7 field of view), which meets the requirements for most uses of the optical imaging lens. Figure 3 As shown, the half-field-of-view (HFOV) of the optical imaging lens 10 is 41.10°, and the relative illumination at the half-field-of-view imaging height (IMGH = 1.269 mm) on the imaging plane is 19.62%. Its half-field-of-view imaging height not only meets the requirement of being greater than half the diagonal size of the image sensing element 90, but also avoids vignetting caused by excessively low relative illumination in the outermost field of view. Figures 4A to 4CThe diagram showing field curvature and distortion illustrates that the maximum field curvature in both the meridional (T) and sagittal (S) directions occurs at a 1.0 field of view, approximately 0.16 mm, corresponding to a maximum distortion rate of 18.70%. Although the optical imaging lens 10 exhibits some distortion under wide field-of-view conditions, post-processing correction using image processing techniques can effectively compensate for the optical system's distortion characteristics without compromising overall image quality, thus achieving ideal imaging results. Furthermore, as... Figure 5 As shown, the maximum lateral chromatic aberration of the optical imaging lens 10 occurs at the 0.37 field of view position, which is approximately 0.75 μm. This value is much smaller than the size of a single pixel, thereby avoiding color shift on the image sensing element 90.

[0131] Second embodiment:

[0132] In the second embodiment of this application, the total length (TTL) of the optical imaging lens 20 is 1.577 mm. (Refer to...) Figure 6 This is a schematic diagram of the optical imaging lens 20 and the optical imaging device according to the second embodiment. The optical imaging lens 20 has an f / # (i.e., F number) of 1.98 and includes, from the object side to the image side, a front aperture 200 with a diameter of 0.579 mm, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, an infrared filter 250, and a planar imaging surface 260.

[0133] Specifically, the first lens 210 has positive refractive power, the magnitude of which affects the total length (TTL) of the overall optical imaging lens. The first lens 210 is made of plastic. The object side 211 of the first lens 210 is convex near the optical axis and has two inflection points at 0.84 times the aperture. The image side 212 of the first lens 210 is concave.

[0134] The second lens 220 has negative refractive power and is made of a high-refractive-index (n = 1.660) and low Abbe number (υ = 20.370) plastic material. It complements the first lens 210, which has positive refractive power, to compensate for the aberrations produced by the first lens 210. It is worth noting that the material of the second lens 220 used in the first and second embodiments of this application has better flowability (i.e., lower melt viscosity) compared to the material of the second lens 220 in the third to fifth embodiments, thereby further optimizing the lens forming effect in the injection molding process.

[0135] The object side 221 of the second lens 220 is concave near the optical axis and has two inflection points at 0.78 times the aperture. The image side 222 of the second lens 220 is convex near the optical axis and has two inflection points at 0.69 times the aperture.

[0136] The third lens 230 is a meniscus lens with positive refractive power. Through its unique morphological structure, it forms a synergistic effect with the first lens 210. It can not only effectively share and balance the distribution of positive refractive power in the optical system, but also improve the light path control ability of the overall optical system and achieve a more ideal imaging effect. The object side 231 of the third lens 230 is concave near the optical axis and has 4 inflection points at 0.42 and 0.80 times the clear aperture respectively. The image side 232 of the third lens 230 is convex and has 4 inflection points at 0.47 and 0.88 times the clear aperture respectively. The ratio of the central thickness (CTHK3) of the third lens 230 to the thickness at 0.5 times the clear aperture (HEP3_0.5X) parallel to the optical axis of the third lens 230 satisfies: 1.0 < CTHK3 / HEP3_0.5X < 1.4. Further, in the second embodiment of the present application, CTHK3 / HEP3_0.5X = 1.36, making it comply with the plastic injection molding manufacturing specifications.

[0137] The fourth lens 240 is a gull-wing-shaped lens with negative refractive power. The negative refractive power is beneficial to shortening its back focal length and shortening the total length TTL of the optical imaging lens. The object side 241 of the fourth lens 240 has 8 inflection points, located at 0.25 times, 0.66 times, 0.88 times and 0.98 times the clear aperture respectively. The image side 242 of the fourth lens 240 has 2 inflection points at 0.25 times the clear aperture. This gull-wing shape design can effectively suppress the incident angle of off-axis field light and further correct the aberration of the off-axis field. The ratio of the thickness at 0.7 times the clear aperture (HEP4_0.7X) parallel to the optical axis of the fourth lens 240 to the central thickness (CTHK4) of the fourth lens 240 satisfies: HEP4_0.7X / CTHK4 = 1.35, making it meet the manufacturing requirements.

[0138] The infrared filter 250 has an object side 251 and an image side 252, and both the object side 251 and the image side 252 are flat. The infrared filter 250 can effectively block the infrared spectrum, thus effectively eliminating the interference of infrared radiation on imaging and significantly improving the imaging quality and color reproduction.

[0139] In the second embodiment, the curvature radii, thicknesses, material refractive indices and Abbe numbers of each lens are shown in Table 3. Among them, the thickness value in the row where 211 is located in Table 3 is the central thickness of the first lens 210, and the value in the row where 212 is located is the air gap thickness between the first lens 210 and the second lens 220, and so on; the relevant conic and aspheric coefficients of each aspheric lens are shown in Table 4.

[0140] Table 3:

[0141]

[0142] Table 4:

[0143] k -4.83E-2 -2.52E+2 2.36E+0 5.10E+0 -4.92E+0 -5.45E-1 -5.72E-1 -5.25E+0 <![CDATA[α2]]> -1.31E-2 -4.09E-2 -1.01E-1 -2.82E-2 1.12E-1 5.97E-1 -3.09E+0 2.11E-1 <![CDATA[α3]]> 1.61E-2 1.53E-2 8.93E-2 -1.61E-1 4.64E-1 1.09E+0 1.26E+1 -1.71E+1 <![CDATA[α4]]> -3.03E-2 -1.21E-1 -3.76E-2 8.54E-1 -2.47E+0 -5.44E+0 -9.41E+1 1.09E+2 <![CDATA[α5]]> -1.96E-3 1.94E-1 -9.05E-3 -2.00E+0 4.97E+0 8.97E+0 4.40E+2 -4.08E+2 <![CDATA[α6]]> -6.05E-2 -2.13E-1 2.74E-1 2.69E+0 -5.35E+0 2.83E+0 -1.18E+3 9.89E+2 <![CDATA[α7]]> 2.05E-1 1.73E-1 -3.62E-1 -1.84E+0 3.25E+0 -2.35E+1 1.91E+3 -1.52E+3 <![CDATA[α8]]> -1.83E-1 -8.37E-2 1.44E-1 4.98E-1 -1.01E+0 2.21E+1 -1.86E+3 1.40E+3 <![CDATA[α9]]> 3.48E-2 1.09E-2 -2.16E-3 -3.65E-4 -1.56E-2 -5.00E+0 1.01E+3 -6.99E+2 <![CDATA[α 10 ]]> -6.38E-3 -1.07E-1 -2.35E+2 1.52E+2 <![CDATA[α 11 ]]> 3.60E-2 -3.19E-1 -1.08E+0 -8.41E+0 <![CDATA[α 12 ]]> -4.05E-2 -2.63E-1 <![CDATA[α 13 ]]> 3.91E-2 -7.74E-1

[0144] In the second embodiment, the MTF curves for each field of view are as follows: Figure 7 As shown, the MTF220 value is greater than 0.48 at half-space frequency in the main imaging region (within 0.7 field of view), which meets the requirements for most uses of the optical imaging lens 20. Figure 8 As shown, the half-field-of-view (HFOV) of the optical imaging lens 20 is 42.00°, and the relative illumination at the half-field-of-view image height (IMGH = 1.258 mm) on the imaging plane is 20.67%. Its half-field-of-view image height not only meets the requirement of being greater than half the diagonal size of the image sensing element 90, but also avoids vignetting caused by excessively low relative illumination in the outermost field of view. Figures 9A to 9C The diagram showing field curvature and distortion illustrates that the maximum field curvature in both the meridional (T) and sagittal (S) directions occurs at a 1.0 field of view, approximately -0.24 mm, corresponding to a maximum distortion rate of 20.10%. Although the optical imaging lens 20 exhibits some distortion under wide field-of-view conditions, post-processing correction using image processing techniques can effectively compensate for the optical system's distortion characteristics without compromising overall image quality, thus achieving ideal imaging results. Furthermore, as... Figure 10 As shown, the maximum lateral chromatic aberration of the optical imaging lens 20 occurs at the 0.96 field of view position, which is approximately 1.10 μm. This value is smaller than the size of a single pixel, thereby avoiding color shift on the image sensing element 90.

[0145] Third embodiment:

[0146] In the third embodiment of this application, the total length (TTL) of the optical imaging lens 30 is 1.551 mm. (Refer to...) Figure 11 This is a schematic diagram of the optical imaging lens 30 and optical imaging device of the third embodiment. The optical imaging lens 30 has an f / # of 1.98 and includes, from the object side to the image side, a front aperture 300 with a diameter of 0.592 mm, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, an infrared filter 350, and a planar imaging surface 360.

[0147] Specifically, the first lens 310 has positive refractive power, the magnitude of which affects the total length (TTL) of the entire optical imaging lens. The first lens 310 is made of plastic, the object side 311 of the first lens 310 is convex, the image side 312 of the first lens 310 is concave near the optical axis, and has two inflection points at 0.38 times the aperture.

[0148] The second lens 320 has a negative refractive power and is made of a plastic material with a high refractive index (n = 1.642) and a low Abbe number (υ = 22.409). It complements the first lens 310 with a positive refractive power to compensate for the aberration generated by the first lens 310. The object side 321 of the second lens 320 is concave near the optical axis and has two inflection points at 0.91 times the clear aperture. The image side 322 of the second lens 320 is convex near the optical axis and has two inflection points at 0.69 times the clear aperture.

[0149] The third lens 330 is a meniscus-shaped lens with a positive refractive power. Through its unique morphological structure, it forms a synergistic effect with the first lens 310, which can not only effectively share and balance the positive refractive power distribution in the optical system, but also improve the optical path control ability of the overall optical system and achieve a more ideal imaging effect. The object side 331 of the third lens 330 is concave, and the image side 332 of the third lens 330 is convex near the optical axis and has four inflection points at 0.66 and 0.88 times the clear aperture respectively. The ratio of the central thickness (CTHK3) of the third lens 330 to the thickness at 0.5 times the clear aperture (HEP3_0.5X) parallel to the optical axis of the third lens 330 satisfies: 1.0 < CTHK3 / HEP3_0.5X < 1.4. Further, in the third embodiment of the present application, CTHK3 / HEP3_0.5X = 1.28, which meets the plastic injection molding manufacturing specifications.

[0150] The fourth lens 340 is a gull-wing-shaped lens with a negative refractive power. The negative refractive power is beneficial to shortening its back focal length and reducing the total length TTL of the optical imaging lens. The object side 341 of the fourth lens 340 has eight inflection points located at 0.25 times, 0.72 times, 0.84 times, and 0.97 times the clear aperture respectively. The image side 342 of the fourth lens 340 has two inflection points at 0.25 times the clear aperture. This gull-wing shape design can effectively suppress the incident angle of off-axis field light and further correct the aberration of the off-axis field. The ratio of the thickness at 0.7 times the clear aperture (HEP4_0.7X) parallel to the optical axis of the fourth lens 340 to the central thickness (CTHK4) of the fourth lens 340 satisfies: HEP4_0.7X / CTHK4 = 1.54, which meets the manufacturing requirements.

[0151] The infrared filter 350 has an object side 351 and an image side 352, and both the object side 351 and the image side 352 are flat. The infrared filter 350 can effectively block the infrared spectrum, thus effectively eliminating the interference of infrared radiation on imaging and significantly improving the imaging quality and color reproduction.

[0152] In the third embodiment, the radius of curvature, thickness, refractive index of the material used, and Abbe number of each lens are shown in Table 5. In Table 5, the thickness value in the row with 311 is the center thickness of the first lens 310, the value in the row with 312 is the air gap thickness between the first lens 310 and the second lens 320, and so on. The relevant conic and aspherical coefficient values ​​of each aspherical lens are shown in Table 6.

[0153] Table 5:

[0154]

[0155] Table 6:

[0156] k 0.000 0.000 0.000 0.000 0.000 -1.48E-1 -4.09E-1 -5.25E+0 <![CDATA[α2]]> -9.71E-3 -2.62E-2 -8.07E-2 -3.02E-2 -2.48E-3 2.15E-1 -3.18E+0 -5.45E-2 <![CDATA[α3]]> 1.94E-2 -8.18E-3 3.93E-2 -1.76E-1 5.18E-1 9.91E-1 1.26E+1 -1.58E+1 <![CDATA[α4]]> -4.02E-2 -1.09E-1 -5.11E-2 8.51E-1 -2.39E+0 -5.04E+0 -9.29E+1 1.07E+2 <![CDATA[α5]]> 4.99E-2 1.95E-1 -9.16E-3 -1.91E+0 4.93E+0 9.00E+0 4.37E+2 -4.09E+2 <![CDATA[α6]]> -8.99E-2 -2.47E-1 2.98E-1 2.71E+0 -5.32E+0 2.68E+0 -1.17E+3 9.87E+2 <![CDATA[α7]]> 8.78E-2 1.73E-1 -3.53E-1 -1.85E+0 3.09E+0 -2.34E+1 1.90E+3 -1.50E+3 <![CDATA[α8]]> -3.41E-2 -4.53E-2 1.24E-1 4.61E-1 -8.61E-1 2.21E+1 -1.85E+3 1.38E+3 <![CDATA[α9]]> -5.66E+0 1.00E+3 -7.02E+2 <![CDATA[α 10 ]]> -2.32E+2 1.47E+2

[0157] In the third embodiment, the MTF curves for each field of view are as follows: Figure 12 As shown, the MTF220 value is greater than 0.40 at half-space frequency in the main imaging region (within 0.7 field of view), which meets the requirements for most uses of the optical imaging lens 30. Figure 13 As shown, the half-field-of-view (HFOV) of the optical imaging lens 30 is designed to be 41.20°, and the relative illumination at the 360° half-field-of-view imaging height (IMGH = 1.26 mm) is 18.12%. Its half-field-of-view imaging height not only meets the requirement of being greater than half the diagonal size of the image sensing element 90, but also avoids vignetting caused by excessively low relative illumination in the outermost field of view. Figures 14A to 14C The diagram showing field curvature and distortion illustrates that the maximum field curvature in both the meridional (T) and sagittal (S) directions occurs at a 1.0 field of view, approximately -0.10 mm, corresponding to a maximum distortion rate of 16.40%. Although this optical imaging lens 30 exhibits some distortion under wide field-of-view conditions, post-processing correction using image processing techniques can effectively compensate for the optical system's distortion characteristics without compromising overall image quality, thus achieving ideal imaging results. Furthermore, as... Figure 15 As shown, the maximum lateral chromatic aberration of the optical imaging lens 30 occurs at the 0.30 field of view position, which is approximately 0.49 μm. This value is much smaller than the size of a single pixel, thereby avoiding color shift on the image sensing element 90.

[0158] Fourth embodiment:

[0159] In the fourth embodiment of this application, the total length (TTL) of the optical imaging lens 40 is 1.473 mm. (Refer to...) Figure 16Schematic diagram of the optical imaging lens 40 and the optical imaging device according to the fourth embodiment. The f / # of the optical imaging lens 40 is 2.00, and it sequentially includes a front aperture 400 with a diameter of 0.577 mm, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, an infrared filter 450, and an imaging surface 460 from the object side to the image side.

[0160] Specifically, the first lens 410 has a positive refractive power, and the magnitude of this refractive power affects the total length TTL of the entire optical imaging lens. The first lens 410 is made of plastic. The object side surface 411 of the first lens 410 is convex, and the image side surface 412 of the first lens 410 is concave near the optical axis and has 2 inflection points at 0.59 times the clear aperture.

[0161] The second lens 420 has a negative refractive power and is made of plastic with a high refractive index (n = 1.6420) and a low Abbe number (υ = 22.409). It is complementary to the first lens 410 with a positive refractive power to compensate for the aberration generated by the first lens 410. The object side surface 421 of the second lens 420 is concave, and the image side surface 422 of the second lens 420 is convex near the optical axis and has 2 inflection points at 0.75 times the clear aperture.

[0162] The third lens 430 is a meniscus-shaped lens with a positive refractive power. It forms a synergistic effect with the first lens 410 through its unique morphological structure, which can not only effectively share and balance the distribution of positive refractive power in the optical system, but also improve the light path control ability of the overall optical system and achieve a more ideal imaging effect. The object side surface 431 of the third lens 430 is concave, and the image side surface 432 of the third lens 430 is convex near the optical axis and has 4 inflection points at 0.63 and 0.84 times the clear aperture respectively. The ratio of the central thickness (CTHK3) of the third lens 430 to the thickness at 0.5 times the clear aperture (HEP3_0.5X) parallel to the optical axis of the third lens 430 satisfies: 1.0 < CTHK3 / HEP3_0.5X < 1.4. Further, in the fourth embodiment of the present application, CTHK3 / HEP3_0.5X = 1.39, making it comply with the plastic injection molding manufacturing specification.

[0163] The fourth lens 440 is a gull-wing shaped lens with negative refractive power. This negative refractive power helps to shorten its back focal length, thus reducing the total length (TTL) of the optical imaging lens. The object-side surface 441 of the fourth lens 440 has four inflection points located at 0.22 and 0.72 times the aperture, respectively, while the image-side surface 442 has two inflection points at 0.25 times the aperture. This gull-wing shape design effectively suppresses the incident angle of off-axis field rays, further correcting aberrations in the off-axis field of view. The ratio of the thickness of the fourth lens 440 at 0.7 times the aperture (HEP4_0.7X) parallel to the optical axis to its center thickness (CTHK4) satisfies: HEP4_0.7X / CTHK4 = 1.81, meeting manufacturing requirements.

[0164] The infrared filter 450 has an object-side surface 451 and an image-side surface 452, both of which are planar. The infrared filter 450 can effectively block the infrared spectrum, thereby effectively eliminating the interference of infrared radiation on imaging, and can also significantly improve image quality and color reproduction.

[0165] In the fourth embodiment, the radius of curvature, thickness, refractive index of the material used, and Abbe number of each lens are shown in Table 7. In Table 7, the thickness value in the row with 411 is the center thickness of the first lens 410, the value in the row with 412 is the air gap thickness between the first lens 410 and the second lens 420, and so on. The relevant conic and aspheric coefficient values ​​of each aspherical lens are shown in Table 8.

[0166] Table 7:

[0167]

[0168] Table 8:

[0169] k 0.000 0.000 0.000 0.000 0.000 -1.48E-1 -4.09E-1 -5.25E+0 <![CDATA[α2]]> -9.93E-4 -1.46E-2 -7.46E-2 -3.43E-2 2.64E-3 2.48E-1 -3.07E+0 -8.26E-2 <![CDATA[α3]]> 4.80E-3 7.58E-3 5.02E-2 -1.76E-1 4.71E-1 9.68E-1 1.20E+1 -1.57E+1 <![CDATA[α4]]> -2.42E-2 -1.12E-1 -7.16E-2 8.29E-1 2.30E+0 -5.49E+0 -9.27E+1 1.07E+2 <![CDATA[α5]]> 6.18E-2 2.06E-1 -5.91E-2 -1.93E+0 4.84E+0 9.12E+0 4.38E+2 -4.10E+2 <![CDATA[α6]]> -9.72E-2 -2.59E-1 2.98E-1 2.69E+0 -5.49E+0 3.06E+0 -1.17E+3 9.87E+2 <![CDATA[α7]]> 8.10E-2 1.39E-1 -3.05E-1 -1.86E+0 3.41E+0 -2.29E+1 1.90E+3 -1.50E+3 <![CDATA[α8]]> -2.92E-2 -2.36E-2 9.86E-2 5.13E-1 -9.49E-1 2.21E+1 -1.85E+3 1.38E+3 <![CDATA[α9]]> -6.90E+0 1.00E+3 -7.04E+2 <![CDATA[α 10 ]]> -2.31E+2 1.50E+2

[0170] In the fourth embodiment, the MTF curves for each field of view are as follows: Figure 17 As shown, the MTF220 value is greater than 0.40 at half-space frequency in the main imaging region (within 0.7 field of view), which meets the requirements for most uses of the optical imaging lens 40. Figure 18 As shown, the half-field-of-view (HFOV) of the optical imaging lens 40 is designed to be 42.42°, and the relative illumination at the half-field-of-view imaging height (IMGH = 1.28 mm) on the imaging plane is 16.36%. Its half-field-of-view imaging height not only meets the requirement of being greater than half the diagonal size of the image sensing element 90, but also avoids vignetting caused by excessively low relative illumination in the outermost field of view. Figures 19A to 19CThe diagram showing field curvature and distortion illustrates that the maximum field curvature in both the meridional (T) and sagittal (S) directions occurs at a 1.0 field of view, approximately -0.10 mm, corresponding to a maximum distortion rate of 17.26%. While this optical imaging lens 40 exhibits some distortion under wide field-of-view conditions, post-processing correction using image processing techniques can effectively compensate for the optical system's distortion characteristics without compromising overall image quality, thus achieving ideal imaging results. Furthermore, as... Figure 20 As shown, the maximum lateral chromatic aberration of the optical imaging lens 40 occurs at the 0.98 field of view position, which is approximately 0.69 μm. This value is smaller than the size of a single pixel, thereby avoiding color shift on the image sensing element 90.

[0171] Fifth embodiment:

[0172] In the fifth embodiment of this application, the total length (TTL) of the optical imaging lens 50 is 1.464 mm. (Refer to...) Figure 21 This is a schematic diagram of the optical imaging lens 50 and optical imaging device of the fifth embodiment. The optical imaging lens 50 has an f / # of 1.98 and includes, from the object side to the image side, a front aperture 500 with a diameter of 0.572 mm, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, an infrared filter 550, and an imaging surface 560.

[0173] Specifically, the first lens 510 has positive refractive power, the magnitude of which affects the total length (TTL) of the entire optical imaging lens. The first lens 510 is made of plastic, the object side 511 of the first lens 510 is convex, the image side 512 of the first lens 510 is concave near the optical axis, and has two inflection points at 0.50 times the aperture.

[0174] The second lens 520 has negative refractive power and is made of a high-refractive-index (n = 1.6420) and low Abbe number (υ = 22.409) plastic material. It complements the first lens 510, which has positive refractive power, to compensate for the aberrations produced by the first lens 510. The object-side surface 521 of the second lens 520 is concave, and the image-side surface 522 of the second lens 520 is convex near the optical axis, and has two inflection points at 0.74 times the aperture.

[0175] The third lens 530 is a meniscus lens with positive refractive power. Through its unique morphological structure, it forms a synergistic effect with the first lens 510. It can not only effectively share and balance the distribution of positive refractive power in the optical system, but also improve the light path control ability of the overall optical system and achieve a more ideal imaging effect. The object side 531 of the third lens 530 is concave, and the image side 532 of the third lens 530 is convex near the optical axis, and has 4 inflection points at 0.66 and 0.88 times the clear aperture respectively. The ratio of the central thickness (CTHK3) of the third lens 530 to the thickness at 0.5 times the clear aperture (HEP3_0.5X) parallel to the optical axis of the third lens 530 satisfies: 1.0 < CTHK3 / HEP3_0.5X < 1.4. Further, in the fifth embodiment of the present application, CTHK3 / HEP3_0.5X = 1.30, making it comply with the plastic injection molding manufacturing specifications.

[0176] The fourth lens 540 is a gull-wing-shaped lens with negative refractive power. The negative refractive power is beneficial to shortening its back focal length and shortening the total length TTL of the optical imaging lens. The object side 541 of the fourth lens 540 has 8 inflection points, which are located at 0.22 times, 0.69 times, 0.91 times and 0.97 times the clear aperture respectively. The image side 542 of the fourth lens 540 has 2 inflection points at 0.25 times the clear aperture. This gull-wing shape design can effectively suppress the incident angle of off-axis field light and further correct the aberration of the off-axis field. The ratio of the thickness at 0.7 times the clear aperture (HEP4_0.7X) parallel to the optical axis of the fourth lens 540 to the central thickness (CTHK4) of the fourth lens 540 satisfies: HEP4_0.7X / CTHK4 = 1.91, making it meet the manufacturing requirements.

[0177] The infrared filter 550 has an object side 551 and an image side 552, and both the object side 551 and the image side 552 are flat. The infrared filter 550 can effectively block the infrared spectrum, thereby effectively eliminating the interference of infrared radiation on imaging, and can also significantly improve the imaging quality and color reproducibility.

[0178] In the fifth embodiment, the radius of curvature, thickness, refractive index of the material used, and Abbe number of each lens are shown in Table IX. Among them, the thickness value in the row where 511 is located in Table IX is the central thickness of the first lens 510, and the value in the row where 512 is located is the air gap thickness between the first lens 510 and the second lens 520, and so on; the relevant conic and aspheric coefficient values of each aspheric lens are shown in Table X.

[0179] Table IX:

[0180]

[0181] Table X:

[0182]

[0183]

[0184] In the fifth embodiment, the MTF curves for each field of view are as follows: Figure 22 As shown, the MTF220 value is greater than 0.38 at half-space frequency in the main imaging region (within 0.7 field of view), which meets the requirements for most uses of the optical imaging lens 50. Figure 23 As shown, the half-field-of-view (HFOV) of the optical imaging lens 50 is designed to be 42.15°, and the relative illumination at the half-field-of-view imaging height (IMGH = 1.27 mm) of the imaging plane 560 is 17.45%. Its half-field-of-view imaging height not only meets the requirement of being greater than half the diagonal size of the image sensing element 90, but also avoids vignetting caused by excessively low relative illumination in the outermost field of view. Figures 24A to 24C The diagram showing field curvature and distortion indicates that the maximum field curvature in both the meridional (T) and sagittal (S) directions occurs at a field of view of 1.0, approximately 0.07 mm, corresponding to a maximum distortion rate of 20.64%. Although this optical imaging lens 50 exhibits some distortion under wide field-of-view conditions, post-processing correction using image processing techniques can effectively compensate for the distortion characteristics of the optical system without compromising overall image quality, thus achieving ideal imaging results. Furthermore, as... Figure 25 As shown, the maximum lateral chromatic aberration of the optical imaging lens 50 occurs at the 0.98 field of view position, which is approximately 1.12 μm. This value is smaller than the size of a single pixel, thereby avoiding color shift on the image sensing element 90.

[0185] In the first to fifth embodiments described above, the optical parameters of each embodiment are presented in Tables 11 and 12 below, and the MTF values ​​of each field of view at 1 / 4, 1 / 2 and full spatial frequencies in each embodiment are presented in Tables 13 and 14 below.

[0186] Table 11:

[0187]

[0188] Among them, Effective Focal Length is the effective focal length, Back Focal Length is the back focal length, Diopter is the diopter, Entrance Pupil Diameter is the entrance pupil diameter, f / # is the f-number, Image SpaceNA is the image-side numerical aperture, Half Field of View is the half field of view, Relative illumination is the relative illumination, Maximum Distortion is the maximum distortion, Maximum incident Angle of Chief Ray is the maximum incident angle of the chief ray, TTL / diagonal of sensor is the ratio of the total length of the optical imaging lens to the diagonal of the sensor, ATHK2 / IMGH is the ratio of the air gap thickness of the second and third lenses on the optical axis to half the diagonal length of the effective pixel area on the imaging plane, and Petzval Sum is the total petzval, and the same applies below.

[0189] Table 12:

[0190]

[0191] Table Thirteen:

[0192] MTF110_0.0F 0.787 0.783 MTF110_0.3F 0.675 0.774 MTF110_0.7F 0.606 0.714 MTF110_1.0F 0.422 0.538 MTF220_0.0F 0.586 0.586 MTF220_0.3F 0.349 0.570 MTF220_0.7F 0.390 0.489 MTF220_1.0F 0.181 0.279 MTF440_0.0F 0.322 0.331 MTF440_0.3F 0.195 0.320 MTF440_0.7F 0.138 0.148 MTF440_1.0F 0.048 0.040

[0193] Table 14:

[0194]

[0195]

[0196] Based on Tables 11 to 13 above, and in conjunction with the first to fifth embodiments described above, it can be seen that in the first embodiment of this application, the imaging surface 160 has the lowest light-receiving angle (CRA = 35.2°), enabling it to match the light-receiving angle of the image sensing element 90 and improving light energy reception efficiency. In the second embodiment of this application, because the fourth lens 240 has the smallest HEP4_0.7X / CTHK4 ratio (i.e., the ratio of the thickness at 0.7 times the aperture to the center thickness of the fourth lens 240), the second embodiment has the highest relative illumination. In the third embodiment of this application, the optical imaging lens 30 has optimal distortion control, resulting in a maximum distortion rate of less than 16.40%. In the fourth embodiment of this application, the optical imaging lens 40 achieves a maximum wide field of view of approximately 85 degrees while maintaining the overall thickness of the miniature mirror assembly. In the fifth embodiment of this application, the optical imaging lens 50 achieves the thinnest structure while balancing various optical parameters (the total length TTL of the optical imaging lens 50 is 1.464 mm, which is shorter than the total length of the lens in other embodiments).

[0197] This application also provides an optical imaging device 1010 (such as...). Figure 26 As shown), it includes the aforementioned optical imaging lens and image sensing element 90 (as shown). Figure 1 , Figure 6 , Figure 11 , Figure 16 and Figure 21 As shown, the image sensing element 90 is a planar image sensing element. The diagonal size of the image sensing element 90 is SDL, and satisfies: 0.59 ≤ TTL / SDL ≤ 0.66. The TTL / SDL ratio can be, but is not limited to, 0.59, 0.61, 0.62, 0.64, 0.66, or other values ​​between 0.59 and 0.66.

[0198] Furthermore, to avoid vignetting caused by packaging misalignment, the image sensing element 90 employs a CMOS sensor with specific parameters: a 1 / 7.3-inch sensor size, an image plane dimension of 2159.36μm × 1218.56μm, a pixel size of 1.12μm, and a 16:9 aspect ratio, enabling a resolution of two megapixels (1928 × 1088). Based on this, the half-field-of-view imaging height (IMGH) of the optical imaging lens is configured to be greater than half its diagonal dimension (i.e., IMGH > 1.24mm), thereby ensuring that the optical imaging device 1010 can effectively avoid vignetting caused by packaging misalignment in practical applications. Therefore, the optical imaging device 1010 of this application, through an innovative optical imaging lens design, effectively reduces the overall length of the optical imaging lens while ensuring excellent image quality. This structural optimization not only significantly reduces the overall volume of the optical imaging device 1010 but also greatly reduces the installation space required in practical applications, thereby achieving the miniaturization design goal of the optical imaging device 1010.

[0199] See Figure 26 This application also provides an electronic device 1000, which includes the aforementioned optical imaging device 1010. The specific structure of the optical imaging device 1010 will not be described in detail here.

[0200] In this implementation, by miniaturizing the optical imaging device 1010, the space occupied by the optical imaging device 1010 in the electronic device 1000 is reduced, which is beneficial to improving the space utilization of the electronic device 1000 and helps the electronic device 1000 to achieve a thinner and lighter design.

[0201] Electronic device 1000 can be a mobile phone, tablet computer, laptop computer, smart screen, personal digital assistant (PDA), camera, personal computer, laptop computer, in-vehicle equipment, wearable device, augmented reality (AR) glasses, AR headset, virtual reality (VR) glasses, or VR headset, or any other device with camera functionality. Figure 26 In this embodiment, the electronic device 1000 is a mobile phone as an example. Of course, other types of electronic devices can also adopt a similar structure, which will not be described in detail below.

[0202] Understandable Figure 26 The electronic device 1000 is shown only schematically, and the actual shape, size, location, and construction of these components are not subject to change. Figure 26Due to limitations, electronic device 1000 may also include, compared to Figure 26 More or fewer parts.

[0203] In some embodiments, the electronic device 1000 may include an optical imaging device 1010, a screen, and a housing. The screen (not shown) is used to display images, videos, etc. The screen may include a light-transmitting panel (not shown) and a display screen (not shown). The light-transmitting panel and the display screen are stacked and fixedly connected. The light-transmitting panel mainly serves to protect the display screen and prevent dust. The material of the light-transmitting panel includes, but is not limited to, glass. The display screen can be a flexible display screen or a rigid display screen. The housing is used to protect the internal electronic components of the electronic device 1000. For example, the optical imaging device 1010 is installed within the housing, located within the internal accommodating space of the electronic device 1000.

[0204] In some embodiments, the electronic device 1000 may further include a circuit board assembly and an image processor, located within the internal accommodating space of the electronic device 1000. The image processor is fixed to and electrically connected to the circuit board assembly. The image processor is communicatively connected to the optical imaging device 1010. The image processor is used to acquire image data from the optical imaging device 1010 and process the image data. The communication connection between the optical imaging device 1010 and the image processor may include data transmission via electrical connections such as wiring, or data transmission via coupling or other methods. It is understood that the optical imaging device 1010 and the image processor may also be connected via other methods capable of data transmission.

[0205] In some embodiments, the electronic device 1000 may further include an analog-to-digital converter (also known as an A / D converter, not shown in the figure). The analog-to-digital converter is connected between the optical imaging device 1010 and the image processor. The analog-to-digital converter is used to convert the signal generated by the optical imaging device 1010 into a digital image signal and transmit it to the image processor, which then processes the digital image signal and finally displays the image or video on the screen.

[0206] In some embodiments, the electronic device 1000 may further include a memory (not shown in the figure), which is communicatively connected to an image processor. The image processor processes the digital image signal and then transmits the image to the memory, so that the image can be retrieved from the memory and displayed on the screen at any time when it is needed to view the image later. In some embodiments, the image processor may also compress the processed digital image signal before storing it in the memory to save memory space.

[0207] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0208] It should be noted that all the above figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application.

[0209] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical imaging lens, characterized in that, Include: The first lens is close to the object side and has positive refractive power; The second lens is adjacent to the first lens and has negative refractive power; The third lens is adjacent to the second lens and has positive refractive power; as well as The fourth lens is adjacent to the third lens and close to the image side, and has negative refractive power; The imaging plane is a plane perpendicular to the optical axis. The first lens, the second lens, the third lens, and the fourth lens are arranged sequentially along the optical axis, and each of the first lens to the fourth lens has an object-side surface facing the object side and an image-side surface facing the image side. The distance on the optical axis from the object side surface of the first lens to the imaging surface is TTL, which is less than a preset distance value.

2. The optical imaging lens as described in claim 1, characterized in that, Include: A filter is disposed between the fourth lens and the imaging surface and is arranged along the optical axis. The filter has an object-side surface facing the object side and an image-side surface facing the image side. The preset distance value is 1.58mm.

3. The optical imaging lens as described in claim 2, characterized in that, The center thicknesses of the first lens, the second lens, the third lens, the fourth lens, and the filter along the optical axis are CTHK1, CTHK2, CTHK3, CTHK4, and CTHK5, respectively, and the total center thickness is ΣCTHK = CTHK1 + CTHK2 + CTHK3 + CTHK4+CTHK5, where the air gap thickness between the first lens and the second lens on the optical axis is ATHK1, the air gap thickness between the second lens and the third lens on the optical axis is ATHK2, the air gap thickness between the third lens and the fourth lens on the optical axis is ATHK3, the air gap thickness between the fourth lens and the filter on the optical axis is ATHK4, and the air gap thickness between the filter and the imaging surface on the optical axis is ATHK5. The total air gap thickness is ΣATHK=ATHK1+ATHK2+ATHK3+ATHK4+ATHK5, and satisfies: 1.00≤ΣCTHK / ΣATHK≤2.

00.

4. The optical imaging lens as described in claim 2 or 3, characterized in that, The first lens has a center thickness of CTHK1 and an edge thickness of ETHK1 on the optical axis; the second lens has a center thickness of CTHK2 and an edge thickness of ETHK2 on the optical axis; the third lens has a center thickness of CTHK3 and an edge thickness of ETHK3 on the optical axis; the fourth lens has a center thickness of CTHK4 and an edge thickness of ETHK4 on the optical axis; and the filter has a center thickness of CTHK5 and an edge thickness of ETHK5 on the optical axis. The ratios of CTHK1 / ETHK1, CTHK2 / ETHK2, CTHK3 / ETHK3, CTHK4 / ETHK4, and CTHK5 / ETHK5 are all greater than or equal to 0.60 and less than or equal to 2.

20.

5. The optical imaging lens as described in claim 1, characterized in that, The focal lengths of the first lens, the second lens, the third lens, and the fourth lens are f1, f2, f3, and f4, respectively, and satisfy the following conditions: 2.50≤f1+f3≤3.50 and -9.70≤f2+f4≤-5.

00.

6. The optical imaging lens as described in claim 1, characterized in that, The back focal length and effective focal length of the optical imaging lens are BFL and EFL, respectively, and satisfy: 0.07≤BFL / EFL≤0.

16.

7. The optical imaging lens as described in claim 1, characterized in that, The effective focal length and entrance pupil diameter of the optical imaging lens are EFL and EPD, respectively, and satisfy: 1.00≤EFL / EPD≤2.

00.

8. The optical imaging lens as described in claim 1, characterized in that, The field of view of the optical imaging lens is FOV, and satisfies: 82.00°≤FOV≤120.00°.

9. The optical imaging lens as described in claim 1, characterized in that, The total Petzval value of the optical imaging lens is Petzval Sum, and satisfies: 0.00≤Petzval Sum≤0.

55.

10. The optical imaging lens as described in claim 1, characterized in that, Include: An aperture is disposed on the object-side surface of the first lens; the radius of the aperture is greater than or equal to 0.28 mm.

11. The optical imaging lens as described in claim 1, characterized in that, The aperture of the first lens is less than or equal to 0.73 mm, the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave near the optical axis.

12. The optical imaging lens as described in claim 1, characterized in that, The aperture of the second lens is less than or equal to 0.80 mm, the object side of the second lens is concave, the image side of the second lens is concave near the optical axis, and the image side of the second lens has at least two first inflection points, wherein the first inflection points are located at a position greater than 0.68 times the aperture.

13. The optical imaging lens as described in claim 1, characterized in that, The refractive indices of the first lens and the second lens are n1 and n2, respectively, and the Abbe numbers of the first lens and the second lens are υ1 and υ2, respectively, satisfying that n2>n1 and υ1>υ2.

14. The optical imaging lens as described in claim 1, characterized in that, The third lens is crescent-shaped, the aperture of the third lens is less than or equal to 1.08 mm, the object side of the third lens is concave, the image side of the third lens is convex near the optical axis, and the image side of the third lens has at least two second inflection points, wherein the second inflection points are located at a position greater than 0.46 times the aperture.

15. The optical imaging lens as described in claim 1 or 14, characterized in that, The thickness of the third lens at its center along the optical axis is CTHK3, and the thickness of the third lens at a point parallel to the optical axis and located at 0.5 times the aperture is HEP3_0.5X, satisfying: 1.0 <CTHK3 / HEP3_0.5X<1.4。 16. The optical imaging lens as claimed in claim 1, characterized in that, The fourth lens is gull-wing shaped, and the aperture of the fourth lens is less than or equal to 1.88 mm. The object side and image side of the fourth lens each have at least four third inversion points and two fourth inversion points, wherein the third inversion points are located at less than 0.30 times the aperture and greater than 0.65 times the aperture, and the fourth inversion points are located at greater than 0.25 times the aperture.

17. The optical imaging lens as claimed in claim 1, characterized in that, The fourth lens has a center thickness of CTHK4 on the optical axis, and a thickness of HEP4_0.7X at a position parallel to the optical axis and located at 0.7 times the aperture, satisfying: 1.00 <HEP4_0.7X / CTHK4<1.92。 18. The optical imaging lens as claimed in claim 1, characterized in that, The air gap thickness between the second lens and the third lens on the optical axis is ATHK2, and half the diagonal length of the effective pixel area on the imaging surface is IMGH, satisfying: 0.020≤ATHK2 / IMGH≤0.

104.

19. The optical imaging lens as claimed in claim 1, characterized in that, The modulation transfer function (MTF) value on the optical axis is MTF_0.0F, the MTF value at a field of view of 0.7 is MTF_0.7F, and the MTF value at a field of view of 1.0 is MTF_1F, and at any spatial frequency, it satisfies: MTF_1.0F < MTF_0.7F. <MTF_0.0F。 20. An optical imaging device, characterized in that, Includes: the optical imaging lens as described in claim 1; and An image sensing element is disposed on the imaging surface of the optical imaging lens, with the surface of the image sensing element facing the imaging surface.

21. The optical imaging apparatus as claimed in claim 20, characterized in that, The diagonal dimension of the image sensing element is SDL, and satisfies: 0.59≤TTL / SDL≤0.

66.

22. An electronic device, characterized in that, It includes the optical imaging device as described in claim 20.

Images