Optical imaging lens

Abstract

The application provides an optical imaging lens, comprising a lens barrel, a lens set and a plurality of spacer elements assembled in the lens barrel, the lens set comprising a first lens, a second lens, a third lens and a fourth lens, the plurality of spacer elements comprising a third spacer element disposed between an image side surface of the third lens and an object side surface of the fourth lens and in contact with the image side surface of the third lens, and the optical imaging lens further satisfies: 1.20 < L / (f*tan(FOV / 2)) ≤ 2.10; 1.25 ≤ (D3s-d3s) / f34 < 1.85; wherein L is the maximum height of the lens barrel, f is the effective focal length of the optical imaging lens, FOV is the maximum field of view angle of the optical imaging lens, D3s is the outer diameter of the object side surface of the third spacer element perpendicular to the plane of the optical axis, d3s is the inner diameter of the object side surface of the third spacer element perpendicular to the plane of the optical axis, and f34 is the combined focal length of the third lens and the fourth lens.

Description

Technical Field

[0001] This application relates to the technical field of optical devices, and particularly to an optical imaging lens. Background Art

[0002] As a core optical component for front cameras of smartphones, vehicle surround-view systems, and miniature security cameras, a wide-angle lens can capture more extensive scene information. With the rapid development of fields such as consumer electronics, vehicle imaging, and security monitoring, the design requirement for overall device thinness and lightness has put forward higher requirements for the miniaturization index of wide-angle lenses. The core contradiction between the miniaturization requirement and the wide-angle lens is the large incident angle problem caused by optical path compression: the angle between the marginal rays of the large field of view and the optical axis is already relatively large, and after the optical path space is compressed, an initial stray light source is formed. After large-angle refraction, the light ray deviation increases sharply, which is likely to irradiate the spacer element in the middle of the lens group, causing multiple reflections and forming a "stray light cycle" in a narrow space.

[0003] Stray light significantly damages the imaging quality: it not only reduces the image plane contrast, resulting in the loss of shadow details and a whitish image, but also produces defects such as light spots and halos. Currently, the stray light problem has become a key bottleneck in balancing the miniaturization and imaging performance of wide-angle lenses, restricting the development of wide-angle lenses in high-end scenarios. Summary of the Invention

[0004] This application provides an optical imaging lens, which includes a lens barrel and a lens group and multiple spacer elements assembled in the lens barrel. The lenses in the lens group have an object side facing the object side and an image side facing the imaging surface side. There is an air gap between adjacent two lenses. The lens group sequentially includes, along the optical axis from the object side to the imaging surface side: a first lens with a negative focal power; a second lens with a positive or negative focal power, the object side of the second lens is convex, and the image side of the second lens is concave; a third lens with a positive focal power, the object side of the third lens is convex, and the image side of the third lens is convex; a fourth lens with a positive or negative focal power, the object side of the fourth lens is convex, and the image side of the fourth lens is concave; the multiple spacer elements include: a third spacer element placed between the image side of the third lens and the object side of the fourth lens and in contact with the image side of the third lens; the optical imaging lens also satisfies: 1.20 < L / (f×tan(FOV / 2)) ≤ 2.10; 1.25 ≤ (D3s - d3s) / f34 < 1.85; where L is the maximum height of the lens barrel, f is the effective focal length of the optical imaging lens, FOV is the maximum field of view angle of the optical imaging lens, D3s is the outer diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, d3s is the inner diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, and f34 is the combined focal length of the third lens and the fourth lens.

[0005] In one embodiment, the optical imaging lens further satisfies: 3.40 < d0s / EPD ≤ 4.55; where d0s is the inner diameter of the plane perpendicular to the optical axis on the object side of the lens barrel, and EPD is the entrance pupil diameter of the optical imaging lens.

[0006] In one embodiment, the plurality of spacer elements further includes a first spacer element disposed between the image side of the first lens and the object side of the second lens and in contact with the image side of the first lens. The optical imaging lens further satisfies: 8.85 < L / (EP01 - ET1) < 15.20; where L is the maximum height of the lens barrel, EP01 is the spacing distance between the object side of the lens barrel and the object side of the first spacer element in the optical axis direction, and ET1 is the edge thickness of the optical effective area of the first lens.

[0007] In one embodiment, the optical imaging lens further satisfies: 2.15 < D3m / (T34 × 10) < 6.50; where D3m is the outer diameter of the plane perpendicular to the optical axis on the image side of the third spacer element, d3m is the inner diameter of the plane perpendicular to the optical axis on the image side of the third spacer element, and T34 is the air gap between the third lens and the fourth lens in the optical axis direction.

[0008] In one embodiment, the plurality of spacer elements includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens. The optical imaging lens further satisfies: 0.85 < EP34 / (T34 + CT4) < 2.95, where EP34 is the spacing distance between the image side of the third spacer element and the object side of the fourth spacer element in the optical axis direction, T34 is the air gap between the third lens and the fourth lens in the optical axis direction, and CT4 is the central thickness of the fourth lens.

[0009] In one embodiment, the optical imaging lens further satisfies: 6.75 < D3s / |SAG32| < 11.90; where D3s is the outer diameter of the plane perpendicular to the optical axis on the object side of the third spacer element, and SAG32 is the axial displacement between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the optical effective area of the image side of the third lens.

[0010] In one embodiment, the optical imaging lens further satisfies: 2.15 ≤ d3m / Yc41 < 3.25; where d3m is the inner diameter of the plane perpendicular to the optical axis on the image side of the third spacer element, and Yc41 is the perpendicular distance from the inflection point closest to the optical axis on the object side of the fourth lens to the optical axis.

[0011] In one embodiment, the plurality of spacer elements further includes a first spacer element disposed between the image side of the first lens and the object side of the second lens and contacting the image side of the first lens, and a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens. The optical imaging lens further satisfies: 0.15 < (EP12 + CT2) / D1m ≤ 0.50; where EP12 is the spacing distance between the image side of the first spacer element and the object side of the second spacer element in the optical axis direction, D1m is the outer diameter of the plane perpendicular to the optical axis of the image side of the first spacer element, and CT2 is the central thickness of the second lens.

[0012] In one embodiment, the plurality of spacer elements further includes a first spacer element disposed between the image side of the first lens and the object side of the second lens and contacting the image side of the first lens, and a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens. The optical imaging lens further satisfies: 0.40 < |f1 / f2| < 0.90, 0.55 < d1s / d2s < 1.95; where d1s is the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element, d2s is the inner diameter of the plane perpendicular to the optical axis of the object side of the second spacer element, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0013] In one embodiment, the plurality of spacer elements further includes a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens. The optical imaging lens further satisfies: 0.65 < (D2m - d2m) / f3 < 2.25; where D2m is the outer diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, and f3 is the effective focal length of the third lens.

[0014] In one embodiment, the plurality of spacer elements further includes a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens. The optical imaging lens further satisfies: 0.65 < (D2m - d2m) / f3 < 2.25; where D2m is the outer diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, and f3 is the effective focal length of the third lens.

[0015] In one embodiment, the plurality of spacer elements further includes a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens, and the optical imaging lens further satisfies: 0.45 < d2s / (CT3×N3) ≤ 0.90; where d2s is the inner diameter of the object side of the second spacer element in a plane perpendicular to the optical axis, CT3 is the central thickness of the third lens, and N3 is the refractive index of the third lens.

[0016] In one embodiment, the plurality of spacer elements further includes a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens, and the optical imaging lens further satisfies: -1.65 < (EP23 + CP3) / R6 < -0.30; where EP23 is the spacing distance between the image side of the second spacer element and the object side of the third spacer element in the direction of the optical axis, CP3 is the maximum thickness of the third spacer element in the direction of the optical axis, and R6 is the radius of curvature of the image side of the third lens.

[0017] In one embodiment, the optical imaging lens further satisfies: 1.10 < DT42 / DT41 < 1.50, 2.70 ≤ d0m / f ≤ 3.15; where DT41 is the maximum radius of the optically effective area of the object side of the fourth lens, DT42 is the maximum radius of the optically effective area of the image side of the fourth lens, d0m is the inner diameter of the image side of the lens barrel in a plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging lens.

[0018] In one embodiment, the plurality of spacer elements further includes a second spacer element disposed between the image side of the second lens and the object side of the third lens and contacting the image side of the second lens, and a fourth spacer element disposed on the image side of the fourth lens and contacting the image side of the fourth lens, and the optical imaging lens further satisfies: 0.80 < Tr5r8 / (EP23 + EP34) < 1.15; where Tr5r8 is the on-axis distance from the object side of the third lens to the image side of the fourth lens, EP23 is the spacing distance between the image side of the second spacer element and the object side of the third spacer element in the direction of the optical axis, and EP34 is the spacing distance between the image side of the third spacer element and the object side of the fourth spacer element in the direction of the optical axis.

[0019] In summary, the present application provides a four-piece optical imaging lens. By controlling the ratio condition 1.20 < L / (f×tan(FOV / 2)) ≤ 2.10 within a reasonable range, the volume of the lens is effectively controlled, making the overall size of the lens smaller, which can meet the requirements of the miniaturized design of the optical imaging lens. However, after the optical path is compressed, the angle of incidence of the marginal rays of the large field of view on the fourth lens is too large. After large-angle refraction, the ray deviation increases sharply, and it is easy to irradiate to the third spacer element, causing multiple reflections and forming a "stray light cycle" in a narrow space. At this time, by controlling the ratio of the difference between the outer and inner diameters of the object side of the third spacer element to the combined focal length of the third and fourth lenses to satisfy 1.25 ≤ (D3s - d3s) / f34 < 1.85, the deflection angle of the marginal rays entering the fourth lens can be effectively controlled, the light transmission path can be optimized, the reflection of the light rays at the third spacer element can be reduced, and then the occurrence of stray light can be reduced, improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial dimension parameter diagram of the optical imaging lens in an embodiment of the present application; Figure 2 For Figure 1 Another partial dimension parameter diagram of the optical imaging lens shown; Figure 3 It is a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application; Figure 4 It is a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application; Figure 5 It is a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application; Figure 6A It is an axial chromatic aberration curve diagram of the optical imaging lens in Embodiment 1, Embodiment 2 and Embodiment 3; Figure 6B It is an astigmatism curve diagram of the optical imaging lens in Embodiment 1, Embodiment 2 and Embodiment 3; Figure 6C It is a distortion curve diagram of the optical imaging lens in Embodiment 1, Embodiment 2 and Embodiment 3; Figure 7 It is a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application; Figure 8 It is a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application; Figure 9 It is a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application; Figure 10A It is an axial chromatic aberration curve diagram of the optical imaging lens in Embodiment 4, Embodiment 5 and Embodiment 6; Figure 10BThe astigmatism curves of the optical imaging lenses in Examples 4, 5, and 6 are shown. Figure 10C The distortion curves of the optical imaging lenses in Examples 4, 5, and 6 are shown. Figure 11 This is a schematic diagram of the structure of the optical imaging lens in Embodiment 7 of this application; Figure 12 This is a schematic diagram of the structure of the optical imaging lens in Embodiment 8 of this application; Figure 13 This is a schematic diagram of the structure of the optical imaging lens of Embodiment 9 of this application; Figure 14A The on-axis chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are shown. Figure 14B The astigmatism curves of the optical imaging lenses in Examples 7, 8 and 9 are shown. Figure 14C The distortion curves of the optical imaging lenses in Examples 7, 8, and 9 are shown. Figure 15A The spot pattern of the optical imaging lens in Embodiment 1, which satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=1.25, is shown. Figure 15B The stray light path diagram of the optical imaging lens in Embodiment 1, which satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=1.25, is shown. Figure 16A The image shows the spot pattern when the optical imaging lens satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=2.35; Figure 16B The stray light path diagram is shown when the optical imaging lens satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=2.35; Figure 17A The image shows the spot pattern when the optical imaging lens satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=0.80; Figure 17B The stray light path diagram is shown when the optical imaging lens satisfies L / (f×tan(FOV / 2))=2.06 and (D3s-d3s) / f34=0.80.

[0021] Figure label: E1: First lens; E2: Second lens; E3: Third lens; E4: Fourth lens; P0: Lens tube; P1: First spacer element; P2: Second spacer element; P3: Third spacer element; P3b: Third auxiliary spacer element; P3c: Third auxiliary spacer element; P4: Fourth spacer element. Detailed Implementation

[0022] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the feature.

[0024] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0025] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region is determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image-side surface, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0026] In this paper, the effective diameter of a lens in a lens group refers to the diameter of the area on the object side or image side used for imaging or light transmission.

[0027] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0028] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figure 1 and Figure 2As shown, according to one aspect of the present application, the present application provides an optical imaging lens, including a lens barrel P0, a lens group assembled in the lens barrel P0, and a plurality of spacer elements. The lenses in the lens group have an object side facing the object side and an image side facing the imaging surface side. There is an air gap between adjacent two lenses. The lens group sequentially includes, along the optical axis from the object side to the imaging surface side: a first lens E1 with a negative optical power; a second lens E2 with a positive or negative optical power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is concave; a third lens E3 with a positive optical power, the object side of the third lens E3 is convex, and the image side of the third lens E3 is convex; a fourth lens E4 with a positive or negative optical power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave; the plurality of spacer elements include: a third spacer element P3, disposed between the image side of the third lens E3 and the object side of the fourth lens E4 and in contact with the image side of the third lens E3; the optical imaging lens further satisfies: 1.20 < L / (f×tan(FOV / 2)) ≤ 2.10; 1.25 ≤ (D3s - d3s) / f34 < 1.85; where L is the maximum height of the lens barrel P0, f is the effective focal length of the optical imaging lens, FOV is the maximum field angle of the optical imaging lens, D3s is the outer diameter of the plane perpendicular to the optical axis of the object side of the third spacer element P3, d3s is the inner diameter of the plane perpendicular to the optical axis of the object side of the third spacer element P3, and f34 is the combined focal length of the third lens E3 and the fourth lens E4.

[0031] Figure 15A and Figure 15B respectively show the spot diagram and the stray light optical path diagram of the optical imaging lens in Embodiment 1 that satisfies L / (f×tan(FOV / 2)) = 2.06 and (D3s - d3s) / f34 = 1.25. Figure 15A In the shown spot diagram, the number of stray light is small and the imaging quality is high. Combining with Figure 15B the shown stray light optical path diagram, the light is reflected from the third spacer element P3 to the structural part at the edge of the fourth lens E4, and is repeatedly reflected and refracted on the inner surface of this structural part: during the reflection process, the stray light energy is weakened, that is, the purpose of weakening stray light is achieved, and finally the number of stray light reaching the imaging surface is less, thereby improving the image quality.

[0032] Figure 16A and Figure 16B respectively show the spot diagram and the stray light optical path diagram when the optical imaging lens satisfies L / (f×tan(FOV / 2)) = 2.06 and (D3s - d3s) / f34 = 2.35. Figure 16A There are annular spots in the central area, the stray light interference is serious, and the image quality is poor. Combining with Figure 16B In the stray light optical path diagram shown, the inner diameter of the third spacer element P3 is reduced, resulting in the reflection of light on the image side of the fourth lens E4 after refraction on the object side of the fourth lens E4. The light is reflected from the image side of the fourth lens E4 to the structural part of the fourth lens E4, and then reflected by the structural part to the image plane. Therefore, a circular spot with relatively high energy appears on the imaging plane.

[0033] Figure 17A and Figure 17B respectively show the spot diagram and the stray light optical path diagram when the optical imaging lens satisfies L / (f×tan(FOV / 2)) = 2.06 and (D3s - d3s) / f34 = 0.80. Figure 17A In the central region of [], arc-shaped stray light appears, with serious stray light interference and poor image quality. Combining Figure 17B In the stray light optical path diagram shown, the inner diameter of the third spacer element P3 is enlarged, and the internally reflected stray light emitted by the third lens E3 cannot be blocked. This part of the light is finally reflected by the structural part of the fourth lens E4 and enters the image plane, presenting an arc-shaped spot in the imaging plane.

[0034] According to some embodiments of the present application, the optical imaging lens further satisfies: 3.40 < d0s / EPD ≤ 4.55; where d0s is the inner diameter of the plane perpendicular to the optical axis on the object side of the lens barrel P0, and EPD is the entrance pupil diameter of the optical imaging lens. The optical imaging lens of the present application is a large-aperture lens. By controlling the ratio of the inner diameter of the plane perpendicular to the optical axis on the object side of the lens barrel P0 to the entrance pupil diameter, the light passing amount of the lens can be satisfied, and the incident light can pass through the first lens E1 at an appropriate angle, optimizing the light transmission path, reducing the reflection and scattering of stray light between the lens barrel P0 and the first lens E1, and effectively improving the imaging quality of the first lens E1.

[0035] According to some embodiments of the present application, the plurality of spacer elements further includes a first spacer element P1 disposed between the image side of the first lens E1 and the object side of the second lens E2 and in contact with the image side of the first lens E1. The optical imaging lens further satisfies: 8.85 < L / (EP01 - ET1) < 15.20; where L is the maximum height of the lens barrel P0, EP01 is the distance between the object side of the lens barrel P0 and the object side of the first spacer element P1 in the optical axis direction, and ET1 is the edge thickness of the optically effective area of the first lens E1. By controlling the ratio of the maximum height of the lens barrel P0, the distance between the object side of the lens barrel P0 and the object side of the first spacer element P1 in the optical axis direction to the difference between the edge thickness of the optically effective area of the first lens, the axial dimension of the lens barrel end can be controlled, so as to control the overall size of the lens and meet the requirements of the lens miniaturization design.

[0036] According to some embodiments of the present application, the optical imaging lens further satisfies: 2.15 < D3m / (T34×10) < 6.50; where D3m is the outer diameter of the image side surface of the third spacer element P3 perpendicular to the optical axis, and T34 is the air gap between the third lens E3 and the fourth lens E4 in the optical axis direction. By controlling the ratio of the outer diameter of the image side surface of the third spacer element P3 perpendicular to the optical axis to the air gap between the third lens E3 and the fourth lens E4 in the optical axis direction, making the outer diameter of the third spacer element P3 greater than this air gap can maintain the structural rigidity of the third spacer element P3, reduce problems such as optical axis deviation and tilt caused by the deformation of the third spacer element P3 after assembly, and improve the positioning accuracy and structural stability of the third lens and the fourth lens.

[0037] According to some embodiments of the present application, the plurality of spacer elements includes a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side surface of the fourth lens E4. The optical imaging lens further satisfies: 0.85 < EP34 / (T34 + CT4) < 2.95, where EP34 is the spacing distance between the image side surface of the third spacer element P3 and the object side surface of the fourth spacer element P4 in the optical axis direction, T34 is the air gap between the third lens E3 and the fourth lens E4 in the optical axis direction, and CT4 is the central thickness of the fourth lens E4. By controlling the ratio of the spacing distance between the image side surface of the third spacer element P3 and the object side surface of the fourth spacer element P4 in the optical axis direction to the sum of the air gap between the third lens E3 and the fourth lens E4 in the optical axis direction and the central thickness of the fourth lens E4, the stability of the overall structural form of the third spacer element P3, the fourth spacer element P4, and the fourth lens E4 is ensured, and the stress concentration phenomenon during the processing and assembly of the fourth lens E4 can be avoided, suppressing the surface shape distortion of the fourth lens E4 caused by stress concentration, thereby ensuring the lens surface shape accuracy and improving the processing yield of the fourth lens E4.

[0038] According to some embodiments of the present application, the optical imaging lens further satisfies: 6.75 < D3s / |SAG32| < 11.90; where D3s is the outer diameter of the object side surface of the third spacer element P3 perpendicular to the optical axis, and SAG32 is the axial displacement between the intersection point of the image side surface of the third lens E3 and the optical axis and the vertex of the effective radius of the optical effective region of the image side surface of the third lens E3. By defining the ratio range of the outer diameter of the object side surface of the third spacer element P3 to the axial displacement between the intersection point of the image side surface of the third lens E3 and the optical axis and the vertex of the effective radius of the image side surface of the third lens E3, the radial dimension of the third spacer element P3 is matched with the curved surface form of the third lens E3, avoiding problems such as assembly misalignment and poor end face fitting caused by the imbalance of the ratio between the two, ensuring the coaxiality of the assembly of the third lens E3 and the third spacer element P3, and laying a structural foundation for the effective transmission of light.

[0039] According to some embodiments of this application, the optical imaging lens also satisfies: 2.15 ≤ d3m / Yc41 < 3.25; where d3m is the inner diameter of the plane perpendicular to the optical axis on the image side of the third spacer element P3, and Yc41 is the vertical distance from the inflection point closest to the optical axis on the object side of the fourth lens E4 to the optical axis. By controlling the ratio of the inner diameter of the plane perpendicular to the optical axis on the image side of the third spacer element P3 to the vertical distance from the inflection point closest to the optical axis on the object side of the fourth lens E4, the inflection characteristics of the object side of the fourth lens E4 can be better adapted, effectively avoiding structural interference between the inflection surfaces of the third spacer element P3 and the object side of the fourth lens E4, ensuring that light can pass through the fourth lens without obstruction, maintaining a stable and smooth optical path, and thus ensuring the imaging quality and light transmission efficiency of the optical lens.

[0040] According to some embodiments of this application, the plurality of spacers further includes a first spacer P1 placed between the image-side surface of the first lens E1 and the object-side surface of the second lens E2 and in contact with the image-side surface of the first lens E1, and a second spacer P2 placed between the image-side surface of the second lens E2 and the object-side surface of the third lens E3 and in contact with the image-side surface of the second lens E2. The optical imaging lens also satisfies: 0.15 < (EP12 + CT2) / D1m ≤ 0.50; where EP12 is the spacing distance between the image-side surface of the first spacer P1 and the object-side surface of the second spacer P2 along the optical axis, D1m is the outer diameter of the plane perpendicular to the optical axis of the image-side surface of the first spacer P1, and CT2 is the center thickness of the second lens E2. By controlling the ratio of the distance between the image side of the first spacer element P1 and the object side of the second spacer element P2 along the optical axis to the sum of the center thickness of the second lens E2 and the outer diameter of the plane perpendicular to the optical axis of the image side of the first spacer element P1, the mounting space between the first spacer element P1 and the second spacer element P2 along the optical axis can be better matched with the radial structural dimension of the first spacer element P1. This improves the assembly stability of the first spacer element, the second spacer element, and the second lens, and avoids problems such as assembly offset and coaxiality deviation caused by imbalance in the axis-diameter ratio.

[0041] According to some embodiments of the present application, the plurality of spacer elements further include a first spacer element P1 disposed between the image side of the first lens E1 and the object side of the second lens E2 and in contact with the image side of the first lens E1, and a second spacer element P2 disposed between the image side of the second lens E2 and the object side of the third lens E3 and in contact with the image side of the second lens E2. The optical imaging lens further satisfies: 0.40 < |f1 / f2| < 0.90, 0.55 < d1s / d2s < 1.95; where f1 is the effective focal length of the first lens E1, f2 is the effective focal length of the second lens E2, d1s is the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element P1, and d2s is the inner diameter of the plane perpendicular to the optical axis of the object side of the second spacer element P2. By controlling the ratio of the effective focal lengths of the first lens E1 and the second lens E2 and the ratio of the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element P1 to the inner diameter of the plane perpendicular to the optical axis of the object side of the second spacer element P2, a reasonable match is formed between the light passing apertures of adjacent spacer elements and the effective focal lengths between adjacent lenses, ensuring that the light passing paths of the first lens and the second lens are continuous and smooth, avoiding sudden changes in the optical path, local obstruction or vignetting caused by an out-of-proportion inner diameter ratio, ensuring the stable passage of the effective light beam, and improving the light energy utilization rate.

[0042] According to some embodiments of the present application, the plurality of spacer elements further include a second spacer element P2 disposed between the image side of the second lens E2 and the object side of the third lens E3 and in contact with the image side of the second lens E2. The optical imaging lens further satisfies: 0.65 < (D2m - d2m) / f3 < 2.25; where D2m is the outer diameter of the plane perpendicular to the optical axis of the image side of the second spacer element P2, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element P2, and f3 is the effective focal length of the third lens E3. By controlling the ratio of the difference between the outer and inner diameters of the plane perpendicular to the optical axis of the image side of the second spacer element P2 to the effective focal length of the third lens E3, the structural dimensions of the second spacer element can be reasonably matched with the optical performance of the third lens. While ensuring the efficient convergence of light through the third lens, it is possible to avoid the fracture of the second spacer element caused by an overly narrow annulus width, effectively reduce the risks of tilt and eccentricity of the third lens, and reduce optical aberrations such as spherical aberration and chromatic aberration, ensuring imaging clarity.

[0043] According to some embodiments of the present application, the plurality of spacer elements further includes a second spacer element P2 disposed between the image side surface of the second lens E2 and the object side surface of the third lens E3 and in contact with the image side surface of the second lens E2. The optical imaging lens further satisfies: 0.45 < d2s / (CT3×N3) ≤ 0.90; where d2s is the inner diameter of the plane perpendicular to the optical axis of the object side surface of the second spacer element P2, CT3 is the central thickness of the third lens E3, and N3 is the refractive index of the third lens E3. By controlling the ratio of the inner diameter of the plane perpendicular to the optical axis of the object side surface of the second spacer element P2 to the product of the central thickness of the third lens E3 and the refractive index of the third lens E3, the optical path distribution in the third lens region is reasonably controlled. While ensuring that the third lens E3 produces a proper deflection of light, the inner diameter of the second spacer element P2 is matched with the optical path contribution of the third lens, which is beneficial to balancing the optical path difference between paraxial and off-axis light rays, suppressing optical aberrations such as spherical aberration, field curvature, and astigmatism, and improving the imaging quality. According to some embodiments of the present application, the plurality of spacer elements further includes a second spacer element P2 disposed between the image side surface of the second lens E2 and the object side surface of the third lens E3 and in contact with the image side surface of the second lens E2. The optical imaging lens further satisfies: -1.65 < (EP23 + CP3) / R6 < -0.30; where EP23 is the spacing distance in the optical axis direction between the image side surface of the second spacer element P2 and the object side surface of the third spacer element P3, CP3 is the maximum thickness of the third spacer element P3 in the optical axis direction, and R6 is the curvature radius of the image side surface of the third lens E3. By controlling the ratio of the sum of the spacing distance in the optical axis direction between the image side surface of the second spacer element P2 and the object side surface of the third spacer element P3 and the maximum thickness of the third spacer element P3 in the optical axis direction to the curvature radius of the image side surface of the third lens E3, it can effectively avoid the situation that the sum of the spacing distance in the optical axis direction between the image side surface of the second spacer element P2 and the object side surface of the third spacer element P3 and the maximum thickness of the third spacer element P3 in the optical axis direction is too small compared with the surface gap of the third lens E3, resulting in insufficient space in the optical axis direction of the third lens E3, and preventing the third spacer element P3 from squeezing and damaging the spacer element and the lens surface at the end face of the third lens E3.

[0044] According to some embodiments of the present application, the optical imaging lens further satisfies: 1.10 < DT42 / DT41 < 1.50, 2.70 ≤ d0m / f ≤ 3.15; where d0m is the inner diameter of the plane perpendicular to the optical axis on the image side of the lens barrel P0, DT41 is the maximum radius of the optically effective area of the object side of the fourth lens E4, DT42 is the maximum radius of the optically effective area of the image side of the fourth lens E4, and f is the effective focal length of the optical imaging lens. By constraining the ratio of the maximum effective radii of the object and image sides of the fourth lens E4 and the ratio of the inner diameter of the plane perpendicular to the optical axis on the image side of the lens barrel P0 to the effective focal length of the optical imaging lens, the inner diameter size of the image side of the lens barrel P0 can be reasonably set to match the light passing aperture of the fourth lens E4, avoid the optically effective imaging area of the fourth lens being blocked by the lens barrel P0, ensure that the light in the full field of view can reach the imaging surface completely, and effectively guarantee the imaging quality of the optical lens.

[0045] According to some embodiments of the present application, the plurality of spacer elements further include a second spacer element P2 disposed between the image side of the second lens E2 and the object side of the third lens E3 and in contact with the image side of the second lens E2, and a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4. The optical imaging lens further satisfies: 0.80 < Tr5r8 / (EP23 + EP34) < 1.15; where Tr5r8 is the on-axis distance from the object side of the third lens to the image side of the fourth lens, EP23 is the spacer distance along the optical axis between the image side of the second spacer element P2 and the object side of the third spacer element P3, and EP34 is the spacer distance along the optical axis between the image side of the third spacer element P3 and the object side of the fourth spacer element P4. By controlling the ratio of the overall axial length of the third and fourth lenses to the sum of the spacer distance along the optical axis between the image side of the second spacer element P2 and the object side of the third spacer element P3 and the spacer distance along the optical axis between the image side of the third spacer element P3 and the object side of the fourth spacer element P4 to be about 1, the structure at the rear end of the lens barrel can be matched with the axial length of the rear lens group, realizing a compact design at the rear end of the lens, reducing dimensional redundancy, being beneficial to the miniaturization of the overall lens, and at the same time being able to effectively suppress the optical axis shift, taking into account both structural compactness and imaging accuracy.

[0046] The following describes in more detail some specific, non-limiting embodiments of the above-described embodiments of this application with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical lens, STO represents the surface of the aperture stop, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the protective glass or filter, S10 represents the image-side plane of the protective glass or filter, and S11 represents the imaging plane.

[0047] Example 1 like Figure 3 As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0048] In this embodiment, the first lens E1 has negative optical power, the object side of the first lens E1 is concave, and the image side of the first lens E1 is convex; the second lens E2 has positive optical power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is concave; the third lens E3 has positive optical power, the object side of the third lens E3 is convex, and the image side of the third lens E3 is convex; the fourth lens E4 has negative optical power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave.

[0049] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0050] Table 1

[0051] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical, and the surface shape of each aspherical lens is... x The following aspherical formulas can be used for limitation: ; in, x Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S8 in Example 1.

[0052] Table 2

[0053] Example 2 like Figure 4 As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0054] In this embodiment, the plurality of spacing elements further includes: a third auxiliary spacing element P3b disposed on the image side of the third spacing element P3 and in contact with the image side of the third spacing element P3, and a third auxiliary spacing element P3c disposed on the image side of the third auxiliary spacing element P3b and in contact with the image side of the third auxiliary spacing element P3b.

[0055] It is worth noting that, compared with the optical imaging lens of Embodiment 1 above, the optical imaging lens of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical lens of Embodiment 2 has different structural parameters from the optical imaging lens of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0056] Example 3 like Figure 5As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0057] It is worth noting that, compared with Embodiment 1 above, the optical imaging lens of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical lens of Embodiment 3 has different structural parameters from the optical imaging lens of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0058] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 1, 2, and 3 are as follows: Figure 6A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging lens. The astigmatism curves of the optical imaging lenses in Embodiments 1, 2, and 3 are shown below. Figure 6B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 1, 2, and 3 are as follows. Figure 6C As shown, it represents the relative deviation between the actual image and the ideal image. According to... Figures 6A to 6C It can be seen that the optical imaging lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0059] Example 4 like Figure 7As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0060] In this embodiment, the first lens E1 has negative optical power, and the object-side surface of the first lens E1 is concave, and the image-side surface of the first lens E1 is concave; the second lens E2 has positive optical power, and the object-side surface of the second lens E2 is convex, and the image-side surface of the second lens E2 is concave; the third lens E3 has positive optical power, and the object-side surface of the third lens E3 is convex, and the image-side surface of the third lens E3 is convex; the fourth lens E4 has positive optical power, and the object-side surface of the fourth lens E4 is convex, and the image-side surface of the fourth lens E4 is concave.

[0061] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0062] Table 3

[0063] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical, and the surface shape of each aspherical lens is... x The aspherical formula in Example 1 can be used for limitation.

[0064] Table 4 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface S1 to S8 in Example 4.

[0065] Table 4

[0066] Example 5 like Figure 8As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0067] It is worth noting that, compared with the optical imaging lens of Embodiment 4 above, the optical imaging lens of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical lens of Embodiment 5 has different structural parameters from the optical imaging lens of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0068] Example 6 like Figure 9 As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0069] In this embodiment, the plurality of spacing elements further includes: a third auxiliary spacing element P3b disposed on the image side of the third spacing element P3 and in contact with the image side of the third spacing element P3, and a third auxiliary spacing element P3c disposed on the image side of the third auxiliary spacing element P3b and in contact with the image side of the third auxiliary spacing element P3b.

[0070] It is worth noting that, compared with the optical imaging lens of Embodiment 4 above, the optical imaging lens of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical lens of Embodiment 6 has different structural parameters from the optical imaging lens of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0071] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows: Figure 10A As shown; the astigmatism curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows. Figure 10B As shown; the distortion curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows. Figure 10C As shown. According to Figures 10A to 10C It can be seen that the optical imaging lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0072] Example 7 like Figure 11 As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0073] In this embodiment, the first lens E1 has negative optical power, the object side of the first lens E1 is convex, and the image side of the first lens E1 is concave; the second lens E2 has negative optical power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is concave; the third lens E3 has positive optical power, the object side of the third lens E3 is convex, and the image side of the third lens E3 is convex; the fourth lens E4 has negative optical power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave.

[0074] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0075] Table 5

[0076] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical, and the surface shape of each aspherical lens is... x The aspherical formula in Example 1 can be used for limitation.

[0077] Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each of the aspherical surfaces S1 to S8 in Example 7.

[0078] Table 6

[0079] Example 8 like Figure 12 As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0080] It is worth noting that, compared with the optical imaging lens of Embodiment 7 above, the optical imaging lens of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 8 has different structural parameters from the optical imaging lens of Embodiment 7 above, that is, the difference between Embodiment 8 and Embodiment 7 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0081] Example 9 like Figure 13As shown, the optical imaging lens in this embodiment includes a lens barrel P0 and a lens group and multiple spacer elements assembled within the lens barrel P0. The lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 arranged sequentially along the optical axis. The multiple spacer elements include: a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer element P2 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer element P3 positioned between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; and a fourth spacer element P4 positioned on the image side of the fourth lens E4 and in contact with the image side of the fourth lens E4.

[0082] In this embodiment, the plurality of spacing elements further includes: a third auxiliary spacing element P3b disposed on the image side of the third spacing element P3 and in contact with the image side of the third spacing element P3, and a third auxiliary spacing element P3c disposed on the image side of the third auxiliary spacing element P3b and in contact with the image side of the third auxiliary spacing element P3b.

[0083] It is worth noting that, compared with Embodiment 7 above, the optical imaging lens of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 9 has different structural parameters from the optical imaging lens of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 above is that the dimensional values ​​of some structural parameters of the lens barrel P0 and multiple spacer elements in the optical lens are different.

[0084] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are as follows: Figure 14A As shown; the astigmatism curves of the optical imaging lenses in Examples 7, 8, and 9 are as follows. Figure 14B As shown; the distortion curves of the optical imaging lenses in Examples 7, 8, and 9 are as follows. Figure 14C As shown. According to Figures 14A to 14C It can be seen that the optical imaging lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0085] In summary, in Examples 1 to 9, the maximum field of view (FOV) of the optical imaging lens, the aperture number (FNO) of the optical imaging lens, the entrance pupil diameter (EPD) of the optical imaging lens, the effective focal length (f) of the optical imaging lens, the effective focal lengths (f1 to f4) of the first lens (E1) to the fourth lens (E4) in the optical imaging lens, the maximum radius (DT41) of the optically effective area on the object side of the fourth lens (E4), the maximum radius (DT42) of the optically effective area on the image side of the fourth lens (E4), the axial displacement (SAG32) between the intersection of the image side of the third lens (E3) and the optical axis and the vertex of the effective radius of the optically effective area on the image side of the third lens (E3), the vertical distance (Yc41) from the inflection point closest to the optical axis on the object side of the fourth lens (E4) to the optical axis, and the edge thickness of the optically effective area of ​​the first lens (E1) are shown in Table 7 below.

[0086] Table 7

[0087] Furthermore, the structural parameters of the optical imaging lenses in Embodiments 1 to 9 are specifically shown in Table 8. It should be understood that the units of the values ​​for each parameter shown in Table 8 are millimeters (mm), and the schematic diagrams of each parameter in the structural diagrams of the optical imaging lenses are as follows. Figure 1 and Figure 2 As shown in the image.

[0088] Table 8

[0089] The specific parameters of the lens barrel P0 and spacer elements involved in Table 8 include: d1s is the inner diameter of the object side of the first spacer element P1, D1m is the outer diameter of the image side of the first spacer element P1, d2s is the inner diameter of the object side of the second spacer element P2, d2m is the inner diameter of the image side of the second spacer element P2, D2m is the outer diameter of the image side of the second spacer element P2, d3s is the inner diameter of the object side of the third spacer element P3, d3m is the inner diameter of the image side of the third spacer element P3, D3s is the outer diameter of the object side of the third spacer element P3, and D3m is the outer diameter of the image side of the third spacer element P3. The outer diameter d0s of the image side of P3 is the inner diameter of the object side of the lens barrel P0, d0m is the inner diameter of the image side of the lens barrel P0, EP01 is the distance from the object side of the lens barrel P0 to the object side of the first spacer element P1 along the optical axis, EP23 is the distance from the image side of the second spacer element P2 to the object side of the third spacer element P3 along the optical axis, CP3 is the maximum thickness of the third spacer element P3 along the optical axis, EP34 is the distance from the image side of the third spacer element P3 to the object side of the fourth spacer element P4 along the optical axis, and L is the maximum height of the lens barrel P0 along the optical axis.

[0090] In summary, the optical imaging lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0091] Table 9

[0092] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical imaging lens and a photosensitive element, the photosensitive element being disposed on the image side of the optical imaging lens for imaging. It is understood that the photosensitive element mentioned in this application may be, but is not limited to, a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, and this application will not elaborate further on these aspects.

[0093] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel, a lens group assembled in the lens barrel, and multiple spacer elements. The lenses in the lens group have an object side facing the object side and an image side facing the imaging surface side. There is an air gap between adjacent two lenses. The number of lenses with optical power in the lens group is four. The lens group sequentially includes, along the optical axis from the object side to the imaging surface side: A first lens with negative optical power; A second lens with positive or negative optical power. The object side of the second lens is convex, and the image side of the second lens is concave; A third lens with positive optical power. The object side of the third lens is convex, and the image side of the third lens is convex; A fourth lens with positive or negative optical power. The object side of the fourth lens is convex, and the image side of the fourth lens is concave; When the optical power of the second lens is negative, the optical power of the fourth lens is negative; The multiple spacer elements include: a first spacer element placed between the image side of the first lens and the object side of the second lens and in contact with the image side of the first lens; a second spacer element placed between the image side of the second lens and the object side of the third lens and in contact with the image side of the second lens; a third spacer element placed between the image side of the third lens and the object side of the fourth lens and in contact with the image side of the third lens; The optical imaging lens further satisfies: 1.20 < L / (f × tan(FOV / 2)) ≤ 2.10; 1.25 ≤ (D3s - d3s) / f34 < 1.85; 0.40 < |f1 / f2| < 0.90; 0.55 < d1s / d2s < 1.95; Where, L is the maximum height of the lens barrel, f is the effective focal length of the optical imaging lens, FOV is the maximum field angle of the optical imaging lens, D3s is the outer diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, d3s is the inner diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, f34 is the combined focal length of the third lens and the fourth lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element, and d2s is the inner diameter of the plane perpendicular to the optical axis of the object side of the second spacer element.

2. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 3.40 < d0s / EPD ≤ 4.55; where, d0s is the inner diameter of the plane perpendicular to the optical axis of the object side of the lens barrel, and EPD is the entrance pupil diameter of the optical imaging lens.

3. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 8.85 < L / (EP01 - ET1) < 15.20; where, EP01 is the interval distance in the optical axis direction between the object side of the lens barrel and the object side of the first spacer element, and ET1 is the edge thickness of the optical effective area of the first lens.

4. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 2.15 < D3m / (T34×10) < 6.50; where D3m is the outer diameter of the plane perpendicular to the optical axis of the image side of the third spacer element, and T34 is the air gap between the third lens and the fourth lens along the optical axis direction.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens. The optical imaging lens further satisfies: 0.85 < EP34 / (T34 + CT4) < 2.95, where EP34 is the spacer distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction, T34 is the air gap between the third lens and the fourth lens along the optical axis direction, and CT4 is the central thickness of the fourth lens.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 6.75 < D3s / |SAG32| < 11.90; where D3s is the outer diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, and SAG32 is the axial displacement between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the optical effective area of the image side of the third lens.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 2.15 ≤ d3m / Yc41 < 3.25; where d3m is the inner diameter of the plane perpendicular to the optical axis of the image side of the third spacer element, and Yc41 is the perpendicular distance from the inflection point closest to the optical axis on the object side of the fourth lens to the optical axis.

8. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 0.15 < (EP12 + CT2) / D1m ≤ 0.50; where EP12 is the spacer distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis direction, D1m is the outer diameter of the plane perpendicular to the optical axis of the image side of the first spacer element, and CT2 is the central thickness of the second lens.

9. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 0.65 < (D2m - d2m) / f3 < 2.25; where D2m is the outer diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, and f3 is the effective focal length of the third lens.

10. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 0.45 < d2s / (CT3×N3) ≤ 0.90; where d2s is the inner diameter of the plane perpendicular to the optical axis of the object side of the second spacer element, CT3 is the central thickness of the third lens, and N3 is the refractive index of the third lens.

11. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: -1.65 < (EP23 + CP3) / R6 < -0.30; where EP23 is the spacer distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction, CP3 is the maximum thickness of the third spacer element along the optical axis direction, and R6 is the radius of curvature of the image side of the third lens.

12. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further satisfies: 1.10 < DT42 / DT41 < 1.50, 2.70 ≤ d0m / f ≤ 3.15; where DT41 is the maximum radius of the optical effective area of the object side of the fourth lens, DT42 is the maximum radius of the optical effective area of the image side of the fourth lens, and d0m is the inner diameter of the plane perpendicular to the optical axis of the image side of the lens barrel.

13. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens, and the optical imaging lens further satisfies: 0.80 < Tr5r8 / (EP23 + EP34) < 1.15; where Tr5r8 is the on-axis distance from the object side of the third lens to the image side of the fourth lens, EP23 is the spacer distance in the optical axis direction between the image side of the second spacer element and the object side of the third spacer element, and EP34 is the spacer distance in the optical axis direction between the image side of the third spacer element and the object side of the fourth spacer element.

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