Optical imaging lens

Abstract

The utility model discloses an optical imaging lens. The optical imaging lens comprises a lens barrel, a six-piece lens group and a spacer group, wherein the six-piece lens group and the spacer group are arranged in the lens barrel; the six-piece type lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object side to the image side along the optical axis; the object side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the spacer group includes a fifth spacer disposed on an image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens. The air interval T56 between the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer in the direction of the optical axis meet the following conditions: 0 lt; cP5 / T56lt; 0.9, 0.9; the inner diameter d5m of the image side surface of the fifth spacer and the outer diameter D5m of the image side surface of the fifth spacer satisfy 1.2 lt; d < 5m > / d < 5mlt >; 2.0.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to an optical imaging lens. BACKGROUND

[0002] In recent years, with the rapid update and replacement of electronic products such as smart phones, optical imaging lenses, as an important component of electronic products such as smart phones, have become the focus of attention of major terminal manufacturers and users, and higher requirements have been put forward for optical imaging lenses, for example, higher requirements have been put forward for the assembly stability of optical imaging lenses.

[0003] Six-piece optical imaging lenses have become mainstream, however, there is usually a large step difference between the fifth lens and the sixth lens in the six-piece optical imaging lens, which can cause the fifth spacer between the fifth lens and the sixth lens to be more sensitive, and the fifth spacer is prone to deformation during assembly, thereby affecting the assembly stability of the optical imaging lens. UTILITY MODEL CONTENT

[0004] An aspect of the present application provides an optical imaging lens, which includes a lens barrel, a six-piece lens group and a spacer group arranged in the lens barrel; the six-piece lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in order from an object side to an image side along an optical axis; the object side surface of the fifth lens is a convex surface; the sixth lens has a negative refractive power; the spacer group includes a fifth spacer arranged on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; wherein the air interval T56 of the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer in the direction of the optical axis satisfy: 0<CP5 / T56<0.9; the inner diameter d5m of the image side surface of the fifth spacer and the outer diameter D5m of the image side surface of the fifth spacer satisfy: 1.2<D5m / d5m<2.0.

[0005] According to an example embodiment of the present application, the spacer group further includes a first spacer arranged on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer arranged on the image side surface of the second lens and in contact with the image side surface of the second lens, wherein the central thickness CT2 of the second lens on the optical axis, the distance EP12 of the first spacer and the second spacer along the optical axis, the inner diameter d2s of the object side surface of the second spacer and the outer diameter D2s of the object side surface of the second spacer satisfy: 2.55<(D2s+d2s) / (D2s-d2s)×CT2 / EP12<6.3.

[0006] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side surface of the second lens and a third spacer disposed on and in contact with the image side surface of the third lens, wherein the air separation T23 of the second lens and the third lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer in the direction of the optical axis, and the distance EP23 of the second spacer and the third spacer along the optical axis satisfy: 0.9 < (CP2 + EP23) / (T23 + CT3) < 2.55.

[0007] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side surface of the second lens and a third spacer disposed on and in contact with the image side surface of the third lens, wherein the refractive index N2 of the second lens, the refractive index N3 of the third lens, the inner diameter d2m of the image side surface of the second spacer, and the inner diameter d3m of the image side surface of the third spacer satisfy: 0.5 < N2 / N3 x d2m / d3m ≤ 1.0.

[0008] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side surface of the second lens and a third spacer disposed on and in contact with the image side surface of the third lens, wherein the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the maximum thickness CP2 of the second spacer in the direction of the optical axis, and the maximum thickness CP3 of the third spacer in the direction of the optical axis satisfy: -20.9 ≤ CP2 / CP3 x R5 / R6 < 31.8.

[0009] According to an exemplary embodiment of the present application, the spacer group further includes a third spacer disposed on and in contact with the image side surface of the third lens and a fourth spacer disposed on and in contact with the image side surface of the fourth lens, wherein the distance EP34 of the third spacer and the fourth spacer along the optical axis and the on-axis distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens satisfy: -1.5 < EP34 / SAG42 < 8.05.

[0010] According to an exemplary embodiment of the present application, the spacer group further includes a third spacer disposed on and in contact with the image side surface of the third lens and a fourth spacer disposed on and in contact with the image side surface of the fourth lens, wherein the distance EP34 of the third spacer and the fourth spacer along the optical axis, the distance EP45 of the fourth spacer and the fifth spacer along the optical axis, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy: 0.7 ≤ EP45 / EP34 x |f5 / f4| < 3.05.

[0011] According to an example embodiment of the present application, the spacer group further comprises a fourth spacer disposed on and in contact with the image side surface of the fourth lens, the fourth spacer having a reflectivity of light in the visible light range of less than or equal to 3%, wherein the inner diameter d4s of the object side surface of the fourth spacer, the outer diameter D4s of the image side surface of the fourth spacer, and the maximum thickness CP4 of the fourth spacer in the direction of the optical axis satisfy: 3.3 ≤ (D4s - d4s) / CP4 < 118.45.

[0012] According to an example embodiment of the present application, the spacer group further comprises a fourth spacer disposed on and in contact with the image side surface of the fourth lens, wherein the maximum thickness CP4 of the fourth spacer in the direction of the optical axis, the maximum thickness CP5 of the fifth spacer in the direction of the optical axis, the radius of curvature R9 of the object side surface of the fifth lens, and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -30.05 < CP5 / CP4 x R9 / R10 < 2.15.

[0013] According to an example embodiment of the present application, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the refractive index N6 of the sixth lens satisfy: 1.0 ≤ (N1 + N3 + N5) / (N2 + N4 + N6) < 1.1.

[0014] The optical imaging lens provided by the present application adopts six lenses, wherein there is a large step difference between the fifth lens and the sixth lens, which can cause the fifth spacer between the fifth lens and the sixth lens to be more sensitive, and the fifth spacer is prone to deformation during assembly, thereby affecting the assembly stability of the optical imaging lens. By reasonably configuring the ratio of the maximum thickness of the fifth spacer in the direction of the optical axis to the air gap of the fifth lens and the sixth lens in the optical axis and the ratio of the outer diameter of the image side surface of the fifth spacer to the inner diameter of the image side surface of the fifth spacer, the abutting displacement amount on both sides of the fifth spacer can be reduced as much as possible, thereby reducing the stress of the fifth spacer caused by assembly pressure after assembly, reducing the influence of the fifth spacer on the fifth lens and the sixth lens in the temperature reliability test, and improving the assembly stability of the optical imaging lens. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting examples made with reference to the accompanying drawings, in which:

[0016] Figure 1 A parameter labeling diagram of the optical imaging lens according to the present application is shown;

[0017] Figure 2AA schematic diagram of stress distribution of each lens when the optical imaging device according to the present application satisfies CP5 / T56=0.82, D5m / d5m=2.05 is shown;

[0018] Figure 2B A schematic diagram of stress distribution of each lens when the optical imaging device according to the present application satisfies CP5 / T56=0.5, D5m / d5m=1.1 is shown;

[0019] Figure 2C A schematic diagram of stress distribution of each lens when the optical imaging device according to the present application satisfies CP5 / T56=0.05, D5m / d5m=1.02 is shown;

[0020] Figure 3 A schematic diagram of structure of the optical imaging lens according to Embodiment 1 of the present application is shown;

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

[0022] Figures 5A to 5C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens according to Embodiment 1 or 2 of the present application are shown respectively;

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

[0024] Figure 7 A schematic diagram of structure of the optical imaging lens according to Embodiment 4 of the present application is shown;

[0025] Figures 8A to 8C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens according to Embodiment 3 or 4 of the present application are shown respectively;

[0026] Figure 9 A schematic diagram of structure of the optical imaging lens according to Embodiment 5 of the present application is shown;

[0027] Figure 10 A schematic diagram of structure of the optical imaging lens according to Embodiment 6 of the present application is shown; and

[0028] Figures 11A to 11C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens according to Embodiment 5 or 6 of the present application are shown respectively. DETAILED DESCRIPTION

[0029] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0030] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0031] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0032] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0033] It should also be understood that the terms "including" and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of the present application, the term "may" is used to indicate "one or more embodiments of the present application." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0034] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] Figure 1FIG. 1 shows a schematic diagram of an optical imaging lens according to an exemplary embodiment of the present application. Figure 1 , d2s represents an inner diameter of an object side surface of the second spacer, d2m represents an inner diameter of an image side surface of the second spacer, D2s represents an outer diameter of the object side surface of the second spacer, d3m represents an inner diameter of an image side surface of the third spacer, d4s represents an inner diameter of an object side surface of the fourth spacer, D4s represents an outer diameter of the object side surface of the fourth spacer, d5m represents an inner diameter of an image side surface of the fifth spacer, D5m represents an outer diameter of the image side surface of the fifth spacer, EP12 represents a distance between the first spacer and the second spacer along the optical axis, CP2 represents a maximum thickness of the second spacer along the optical axis, EP23 represents a distance between the second spacer and the third spacer along the optical axis, CP3 represents a maximum thickness of the third spacer along the optical axis, EP34 represents a distance between the third spacer and the fourth spacer along the optical axis, CP4 represents a maximum thickness of the fourth spacer along the optical axis, EP45 represents a distance between the fourth spacer and the fifth spacer along the optical axis, and CP5 represents a maximum thickness of the fifth spacer along the optical axis.

[0037] Reference is made to Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 9 and Figure 10 , a first aspect of the present application provides an optical imaging lens, which can include a lens barrel, and a six-element lens group and a spacer group disposed in the lens barrel. The six-element lens group can include, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Any two adjacent lenses among the first lens to the sixth lens can have an air gap therebetween. An object side surface of the fifth lens can be convex. The sixth lens can have a negative refractive power. The spacer group can include a fifth spacer disposed at least partially in contact with an image side surface of the fifth lens.

[0038] In some embodiments, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer along the optical axis may satisfy: <CP5 / T56<0.9;第五间隔件的像侧面的内径d5m与第五间隔件的像侧面的外径D5m可满足:1.2<D5m / d5m<2.0。第五透镜和第六透镜之间存在较大的段差,这会导致第五间隔件较为敏感,第五间隔件在组立过程中易变形,从而影响光学成像镜头的组立稳定性。通过合理配置第五间隔件沿光轴方向的最大厚度与第五透镜和第六透镜在光轴上的空气间隔的比值以及第五间隔件的像侧面的外径与第五间隔件的像侧面的内径的比值,能够尽可能的减小第五间隔件两侧的承靠错位量,进而减小第五间隔件在组立后因组装压力而产生的应力,减小第五间隔件在温度类信赖性试验中对第五透镜和第六透镜的影响,提高光学成像镜头的组立稳定性。

[0039] Figure 2A For optical imaging lens, CP5 / T56=0.82, D5m / d5m=2.05, that is, the optical imaging lens meets 1.2 <D5m / d5m<3时,各个透镜的应力分布示意图。当光学成像镜头不满足1.2<D5m / d5m<3时,例如 Figure 2B Schematic diagram of stress distribution of each lens of an optical imaging lens under the conditions of CP5 / T56=0.5 and D5m / d5m=1.1; and Figure 2C Schematic diagram of stress distribution of each lens of the optical imaging lens under the conditions of CP5 / T56=0.05 and D5m / d5m=1.02.

[0040] exist Figures 2A to 2C The lighter the color, the greater the stress in the lens. Figure 2B and Figure 2C From the above, when D5m / d5m=1.1 or D5m / d5m=1.02, the bearing misalignment on both sides of the fifth spacer is large, which will lead to obvious stress concentration in the fifth spacer. The fifth spacer is prone to abnormal problems such as tilting and deformation during assembly, resulting in poor assembly stability of the optical imaging lens. Figure 2A From the above, when D5m / d5m=2.05, the bearing misalignment on both sides of the fifth spacer is effectively reduced, the stress concentration of the fifth spacer is reduced, and the assembly stability of the optical imaging lens is improved. <CP5 / T56<0.9”时,通过调控光学成像镜头满足“1.2<D5m / d5m<2.0”,能够有效降低第五间隔件在组立过程中变形的风险,提高光学成像镜头的组立稳定性。

[0041] In an example embodiment, the spacer group can include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. Reasonable use of the spacers can effectively avoid stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0042] In an example embodiment, the lens barrel can include an object-side end face, an image-side end face, an outer annular face, and an inner annular face, wherein the object-side end face of the lens barrel is the end face of the lens barrel closest to the object side, and the image-side end face of the lens barrel is the end face of the lens barrel closest to the image side; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular face, and the surface of the lens barrel closest to the optical axis is the inner annular face.

[0043] In an example embodiment, the optical imaging lens can include a diaphragm disposed between the second lens and the third lens.

[0044] In an example embodiment, the spacer group can include a first spacer and a second spacer, wherein the first spacer can be disposed on and at least partially in contact with the image-side face of the first lens, and the second spacer can be disposed on and at least partially in contact with the image-side face of the second lens. The center thickness CT2 of the second lens on the optical axis, the distance EP12 of the first spacer and the second spacer along the optical axis, the inner diameter d2s of the object-side face of the second spacer, and the outer diameter D2s of the object-side face of the second spacer can satisfy: 2.55 < (D2s+d2s) / (D2s-d2s) x CT2 / EP12 < 6.3. By controlling the above condition, the ratio of the center thickness and the edge thickness of the second lens can be constrained within a reasonable range, ensuring that the second lens has good processability and effectively ensuring the precision of the abutting position of the two adjacent lenses after assembly, so that the optical parameters of the optical imaging lens meet the design requirements; at the same time, the outer diameter of the second lens can also be limited, preventing the effective diameter surfaces of the two adjacent lenses from interfering in the direction of the optical axis after assembly, avoiding abnormal appearance and performance problems caused thereby, and improving the appearance and performance yield of the optical imaging lens.

[0045] In an example embodiment, the spacer group can include a second spacer and a third spacer, the second spacer can be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, and the third spacer can be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The air spacing T23 of the second lens and the third lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer in the direction of the optical axis, and the distance EP23 of the second spacer and the third spacer along the optical axis can satisfy: 0.9 < (CP2 + EP23) / (T23 + CT3) < 2.55. By controlling the above condition formula, the central thickness and the edge thickness of the third lens can be constrained within a reasonable range, and the surface accuracy of the third lens after forming is improved. At the same time, in cooperation with the limitation of the air spacing of the second lens and the third lens on the optical axis, the forming feasibility of the second spacer is improved, the assembly stability and yield of the optical imaging lens are improved, and the problem of poor assembly stability of the optical imaging lens due to the difficulty of the flatness of the two side bearing surfaces of the second spacer and the small air spacing between the second lens and the third lens is avoided.

[0046] In an example embodiment, the spacer group can include a second spacer and a third spacer, the second spacer can be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, and the third spacer can be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The air spacing T23 of the second lens and the third lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer in the direction of the optical axis, and the distance EP23 of the second spacer and the third spacer along the optical axis can satisfy: 0.9 < (CP2 + EP23) / (T23 + CT3) < 2.55. By controlling the above condition formula, the central thickness and the edge thickness of the third lens can be constrained within a reasonable range, and the surface accuracy of the third lens after forming is improved. At the same time, in cooperation with the limitation of the air spacing of the second lens and the third lens on the optical axis, the forming feasibility of the second spacer is improved, the assembly stability and yield of the optical imaging lens are improved, and the problem of poor assembly stability of the optical imaging lens due to the difficulty of the flatness of the two side bearing surfaces of the second spacer and the small air spacing between the second lens and the third lens is avoided.

[0047] In an exemplary embodiment, the spacer group can include a second spacer and a third spacer, wherein the second spacer can be disposed on and at least partially in contact with the image side surface of the second lens, and the third spacer can be disposed on and at least partially in contact with the image side surface of the third lens. The radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the maximum thickness CP2 of the second spacer along the optical axis, and the maximum thickness CP3 of the third spacer along the optical axis can satisfy: -20.9≤CP2 / CP3×R5 / R6<31.8. The radius of curvature of the object side surface of the third lens indirectly determines the maximum thickness of the second spacer, and the radius of curvature of the image side surface of the third lens indirectly determines the maximum thickness of the third spacer. By controlling the above condition, the maximum thickness of the second spacer and the third spacer can be respectively constrained within a reasonable range, and the formability of the second spacer and the third spacer can be improved.

[0048] In an exemplary embodiment, the spacer group can include a third spacer and a fourth spacer, wherein the third spacer can be disposed on and at least partially in contact with the image side surface of the third lens, and the fourth spacer can be disposed on and at least partially in contact with the image side surface of the fourth lens. The distance EP34 of the third spacer and the fourth spacer along the optical axis and the on-axis distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the maximum effective radius vertex of the image side surface of the fourth lens can satisfy: -1.5<EP34 / SAG42<8.05. The fourth lens has a structure of a middle thin edge thick, which increases the difficulty of forming the fourth lens and increases the possibility of generating stray light at the position of the fourth lens. By controlling the above condition, the forming yield of the fourth lens can be ensured, the gel wavefront velocity is in a uniform state when the fourth lens is formed, the risk of the fourth lens having a weld mark after the gel is cooled is reduced, the stray light generated due to the weld mark is reduced, and the imaging quality of the optical imaging lens is improved.

[0049] In an example embodiment, the spacer set can include a third spacer, a fourth spacer, and a fifth spacer, wherein the third spacer can be disposed on and at least partially in contact with the image side surface of the third lens, the fourth spacer can be disposed on and at least partially in contact with the image side surface of the fourth lens, and the fifth spacer can be disposed on and at least partially in contact with the image side surface of the fifth lens. The distance EP34 between the third spacer and the fourth spacer along the optical axis, the distance EP45 between the fourth spacer and the fifth spacer along the optical axis, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens can satisfy: 0.7≤EP45 / EP34×|f5 / f4|<3.05. The fourth lens is in a form of a middle-thin-edge-thick structure, which increases the difficulty of forming the fourth lens and increases the possibility of stray light at the position of the fourth lens. By controlling the above condition, the surface profile of the fourth lens can be effectively constrained so that the surface profile curve of the fourth lens is relatively smooth, the sol gel wavefront curve is relatively smooth during injection molding, there is no convergence wrapping phenomenon, the risk of weld marks on the fourth lens is reduced, and thus the stray light and appearance problems caused by the weld marks are reduced. Meanwhile, in combination with the limitation of the effective focal length of the fifth lens, the light rays can be further diverged so that the optical imaging lens realizes the characteristic of a large image surface.

[0050] In an example embodiment, the spacer set can include a fourth spacer, wherein the fourth spacer can be disposed on and at least partially in contact with the image side surface of the fourth lens. The reflectivity of the fourth spacer to light rays in the visible light range is less than or equal to 3%. The inner diameter d4s of the object side surface of the fourth spacer, the outer diameter D4s of the object side surface of the fourth spacer, and the maximum thickness CP4 of the fourth spacer along the optical axis direction can satisfy: 3.3≤(D4s-d4s) / CP4<118.45. The light rays emitted from the fourth lens are divergent, which can cause stray light to be more easily formed between the fourth lens and the fifth lens. By controlling the ratio of the difference between the outer diameter and the inner diameter of the fourth spacer to the maximum thickness of the fourth spacer, the shape of the fourth spacer can be reasonably constrained, the generation of reflected light paths (for example, the inner diameter surface of the fourth spacer after the light rays are incident) is reduced, and the reflectivity of the fourth spacer to light rays in the visible light range is less than or equal to 3% through surface treatment, which further reduces the stray light problem caused by the unavoidable reflected light paths.

[0051] In an exemplary embodiment, the spacer group may include a fourth spacer and a fifth spacer, wherein the fourth spacer may be positioned on the image side surface of the fourth lens and at least partially contact the image side surface of the fourth lens, and the fifth spacer may be positioned on the image side surface of the fifth lens and at least partially contact the image side surface of the fifth lens. The maximum thickness CP4 of the fourth spacer along the optical axis, the maximum thickness CP5 of the fifth spacer along the optical axis, the curvature radius R9 of the object side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens may satisfy: -30.05 <CP5 / CP4×R9 / R10<2.15。通过控制上述条件式,能够将第五间隔件和第四间隔件的最大厚度之比与第五透镜的物侧面和像侧面的曲率半径之比约束在合理范围内,在保证第五透镜的成型良率的情况下将其中一个间隔件用注塑品代替,从而在提高光学成像镜头的组立稳定性的同时降低成本,提高光学成像镜头的竞争力。

[0052] In an exemplary embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the refractive index N6 of the sixth lens can satisfy the following relationship: 1.0 ≤ (N1 + N3 + N5) / (N2 + N4 + N6) < 1.1. The first lens is the first lens in the optical imaging lens that diverges light, and the third lens or the fourth lens also diverges light. By controlling the above conditional expressions, the first, third, and fourth lenses can have higher refractive indices, maximizing light divergence and achieving the wide-angle and large image plane characteristics of the optical imaging lens. Simultaneously, by limiting the refractive indices of other lenses, the optical imaging lens can be compacted, miniaturized, and improved in competitiveness.

[0053] In an exemplary embodiment, the Semi-FOV, half of the maximum field of view (FOV), of the optical imaging lens satisfies the following conditions: 48.7° ≤ Semi-FOV ≤ 58.1°. Properly configuring the maximum field of view of the optical imaging lens enables the optical imaging lens to achieve wide-angle and large image dimensions.

[0054] The optical imaging lens according to the above-described embodiment of the present application can utilize six lenses and at least one spacer. By rationally allocating the parameters of each lens and spacer, it is possible to achieve miniaturization, a wide angle, and a large image plane for the optical imaging lens, reduce the risk of stray light, and improve the formability, assembly stability, assembly yield, and imaging quality of the optical imaging lens.

[0055] It should be appreciated that the present application focuses on the performance optimization of a six-piece optical imaging lens, and in particular, the present application focuses on how to overcome the problem of poor assembly stability caused by, for example, the fifth spacer being prone to deformation during assembly, or the problem of poor assembly stability at other lenses or spacers, or how to achieve wide angle and large image surface, or how to improve stray light, etc. The specific power distribution of the six-piece lens and the surface settings of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. That is, although several specific power distributions and surface settings of the lens group are shown in the embodiments of the present application, it should be understood that these embodiments are only exemplary, and the lens group in the present application should not be limited to the several specific cases shown in the embodiments, but should be widely understood as a six-piece lens group.

[0056] In the embodiments of the present application, at least one of the surfaces of each of the first to sixth lenses is a non-spherical surface. The characteristic of a non-spherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, a non-spherical lens has better curvature radius characteristics, with the advantages of improving distortion aberration and improving astigmatism aberration. After using a non-spherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Alternatively, the object side and the image side of each of the second to sixth lenses are non-spherical surfaces.

[0057] Those skilled in the art should understand that the number of lenses and spacers constituting the optical imaging lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification.

[0058] The specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0059] Example 1

[0060] The following refers to Figure 3 An optical imaging lens according to Embodiment 1 of the present application is described.

[0061] As Figure 3As shown, the optical imaging lens includes a lens barrel P0, and a six-piece lens group and a spacer group disposed in the lens barrel P0. The six-piece lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO can be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block excess light rays in the imaging process from entering the next lens, while making the lens better abut against the lens barrel P0, enhancing the structural stability of the optical imaging lens.

[0062] The first lens E1 has a negative refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a positive refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a convex surface. The third lens E3 has a positive refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has a negative refractive power, the object side surface S7 is a concave surface, and the image side surface S8 is a concave surface. The fifth lens E5 has a positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface. The sixth lens E6 has a negative refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a concave surface. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on an imaging surface S15 (not shown).

[0063] Table 1 shows the basic parameter table of the optical imaging lens of Embodiment 1, wherein the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0064]

[0065] Table 1

[0066] In this embodiment, the total effective focal length f of the optical imaging lens is 2.51 mm, and the half of the maximum field of view angle Semi-FOV of the optical imaging lens is 48.7°.

[0067] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces, each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0068]

[0069] wherein x is the distance from the vertex of the aspherical surface at a position 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 inverse of the curvature radius R in Table 1); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface S3-S12 in Example 1.

[0070]

[0071]

[0072] Table 2

[0073] Example 2

[0074] The following refers to Figure 4 An optical imaging lens according to Example 2 of the present application is described.

[0075] As shown in Figure 4 , the optical imaging lens includes a lens barrel P0 and a six-piece lens group and a spacer group disposed in the lens barrel P0. The six-piece lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO can be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0076] The structure of the lens of the present example is the same as that of the lens of Example 1, i.e., the basic parameter table of the optical imaging lens of the present example is the same as Table 1, and the aspherical surface coefficient table is the same as Table 2. The difference between the present example and Example 1 is that the structure and size of some elements in the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, and the fifth spacer P5 are different.

[0077] Figure 5A The on-axis chromatic aberration curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the convergence point deviation of light rays of different wavelengths after passing through the optical imaging lenses. Figure 5B The astigmatism curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different field angles. Figure 5C The distortion curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the distortion size values corresponding to different field angles. According to Figures 5A to 5C It can be seen that the optical imaging lenses given in Examples 1 and 2 can achieve good imaging quality.

[0078] Example 3

[0079] The following refers to Figure 6 An optical imaging lens according to Embodiment 3 of the present application is described.

[0080] As Figure 6 shown, the optical imaging lens includes a lens barrel P0 and a six-piece lens group and a spacer group disposed in the lens barrel P0. The six-piece lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO can be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block extra light rays in the imaging process from entering the next lens, while making the lens and the lens barrel P0 better abut, enhancing the structural stability of the optical imaging lens.

[0081] The first lens E1 has negative refractive power, with the object side surface S1 being convex and the image side surface S2 being concave. The second lens E2 has positive refractive power, with the object side surface S3 being convex and the image side surface S4 being convex. The third lens E3 has negative refractive power, with the object side surface S5 being convex and the image side surface S6 being concave. The fourth lens E4 has positive refractive power, with the object side surface S7 being convex and the image side surface S8 being convex. The fifth lens E5 has negative refractive power, with the object side surface S9 being convex and the image side surface S10 being concave. The sixth lens E6 has negative refractive power, with the object side surface S11 being convex and the image side surface S12 being concave. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from the object passes through the surfaces S1 to S14 in order and is finally imaged on an imaging surface S15 (not shown).

[0082] Table 3 shows the basic parameter table of the optical imaging lens of Embodiment 3, wherein the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0083]

[0084] Table 3

[0085] In this embodiment, the total effective focal length f of the optical imaging lens is 2.26 mm, and the half of the maximum field of view angle Semi-FOV of the optical imaging lens is 52.0°.

[0086] In this embodiment, both the object-side and image-side surfaces of any of the second through sixth lenses E2 through E6 are aspherical. Table 4 lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S3-S12 in Example 3.

[0087] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -1.1077E-01 1.8080E-01 -3.7677E+00 2.8511E+01 -1.3667E+02 4.0915E+02 -7.4666E+02 7.5841E+02 -3.2851E+02 S4 -1.7820E-01 9.7515E-01 -6.0553E+00 2.3975E+01 -7.2089E+01 1.5811E+02 -2.3149E+02 1.9855E+02 -7.4874E+01 S5 -3.9883E-01 2.2254E+00 -1.4430E+01 8.4494E+01 -3.7390E+02 1.1172E+03 -2.0923E+03 2.2087E+03 -1.0011E+03 S6 -5.3041E-01 1.7579E+00 -8.4540E+00 4.1767E+01 -1.6168E+02 4.2371E+02 -6.9354E+02 6.3780E+02 -2.5121E+02 S7 -9.3313E-02 1.1609E-01 -1.7593E-01 8.6522E-02 2.8139E-01 -6.8945E-01 6.6516E-01 -2.5089E-01 1.1975E-02 S8 4.7735E-02 -3.6099E-02 -4.1695E-02 1.4966E-01 -6.4723E-01 1.7100E+00 -2.2608E+00 1.4675E+00 -3.7353E-01 S9 -4.2607E-01 6.6242E-01 -1.5900E+00 3.7625E+00 -8.2759E+00 1.3397E+01 -1.3556E+01 7.5740E+00 -1.7901E+00 S10 -6.0306E-01 9.4610E-01 -1.5806E+00 2.0698E+00 -2.0706E+00 1.6054E+00 -9.1796E-01 3.2672E-01 -5.3308E-02 S11 -2.2680E-01 1.9008E-02 -1.5984E-01 4.8132E-01 -6.3597E-01 4.6482E-01 -1.9055E-01 4.0996E-02 -3.6124E-03 S12 -1.1780E-01 -1.3004E-01 2.1566E-01 -1.8190E-01 9.6370E-02 -3.3527E-02 7.4258E-03 -9.4998E-04 5.2864E-05

[0088] Table 4

[0089] Example 4

[0090] The following reference Figure 7 An optical imaging lens according to Example 4 of the present application is described.

[0091] like Figure 7 As shown, the optical imaging lens includes a lens barrel P0 and a six-element lens group and a spacer group disposed within the lens barrel P0. The six-element lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO may be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0092] The structure of the lens of this embodiment is the same as that of the lens of Example 3. That is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. This embodiment differs from Example 3 in that the structural dimensions of some elements of the first spacer P1, second spacer P2, third spacer P3, fourth spacer P4, and fifth spacer P5 are different.

[0093] Figure 8A The axial chromatic aberration curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 8B The astigmatism curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 8C The distortion curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the distortion values ​​corresponding to different field angles. Figures 8A to 8C It can be seen that the optical imaging lenses provided in Examples 3 and 4 can achieve good imaging quality.

[0094] Example 5

[0095] The following reference Figure 9 The optical imaging lens according to Example 5 of the present application is described.

[0096] As shown in Figure 9 The optical imaging lens includes a lens barrel P0 and a six-piece lens group and a spacer group disposed in the lens barrel P0. The six-piece lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO can be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block excess light rays in the imaging process from entering the next lens, while making the lens better abut against the lens barrel P0, enhancing the structural stability of the optical imaging lens.

[0097] The first lens E1 has a negative refractive power, with a convex object side surface S1 and a concave image side surface S2. The second lens E2 has a positive refractive power, with a concave object side surface S3 and a convex image side surface S4. The third lens E3 has a positive refractive power, with a convex object side surface S5 and a convex image side surface S6. The fourth lens E4 has a negative refractive power, with a concave object side surface S7 and a concave image side surface S8. The fifth lens E5 has a positive refractive power, with a convex object side surface S9 and a convex image side surface S10. The sixth lens E6 has a negative refractive power, with a concave object side surface S11 and a convex image side surface S12. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from the object passes through the surfaces S1-S14 in order and is finally imaged on an imaging surface S15 (not shown).

[0098] Table 5 shows the basic parameter table of the optical imaging lens of embodiment 5, wherein the units of the radius of curvature, the thickness / distance, and the focal length are all millimeters (mm).

[0099]

[0100]

[0101] Table 5

[0102] In this embodiment, the total effective focal length f of the optical imaging lens is 2.22 mm, and the half of the maximum field of view angle Semi-FOV of the optical imaging lens is 58.1°.

[0103] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for the aspherical surfaces S1-S12 in embodiment 5.

[0104]

[0105] Table 6

[0106] Example 6

[0107] The following refers to Figure 10 An optical imaging lens according to Embodiment 6 of the present application is described.

[0108] As shown in Figure 10 , the optical imaging lens includes a lens barrel P0, and a six-piece lens group and a spacer group disposed in the lens barrel P0. The six-piece lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO can be disposed between the second lens E2 and the third lens E3. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0109] The structure of the lens of the present embodiment is the same as that of the lens of Embodiment 5, i.e., the basic parameter table of the optical imaging lens of the present embodiment is the same as Table 5, and the aspherical surface coefficient table is the same as Table 6. The difference between the present embodiment and Embodiment 5 is that the structure sizes of some elements in the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, and the fifth spacer P5 are different.

[0110] Figure 11A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 5 and 6 are shown, which represent the convergence focus deviations of light rays of different wavelengths after passing through the optical imaging lenses. Figure 11B The astigmatism curves of the optical imaging lenses of Embodiments 5 and 6 are shown, which represent the meridional image surface curvatures and sagittal image surface curvatures corresponding to different field angles. Figure 11C The distortion curves of the optical imaging lenses of Embodiments 5 and 6 are shown, which represent the distortion size values corresponding to different field angles. According to Figures 11A to 11C It can be known that the optical imaging lenses given in Embodiments 5 and 6 can achieve good imaging quality.

[0111] Table 7 shows the values of the parameters d2s, d2m, D2s, d3m, d4s, D4s, d5m, D5m, EP12, CP2, EP23, CP3, EP34, CP4, EP45, CP5, and SAG42 in each of Embodiments 1-6. Among them, the above parameters can be measured according to the labeling method shown in Figure 1 , and the units of the parameters listed in Table 7 are all mm.

[0112] Parameter / Example 1 2 3 4 5 6 d2s 1.7467 2.0427 2.0416 1.9906 1.5510 1.5510 d2m 1.6082 1.5240 1.6000 1.3029 1.4363 1.4363 D2s 3.3224 3.3970 3.0661 3.3407 3.7750 3.5874 d3m 1.6946 1.4562 1.6832 1.8817 1.8112 2.5295 d4s 1.8619 1.9271 2.2879 2.2879 1.8574 1.7869 D4s 3.8206 4.0585 3.3714 3.6915 4.2450 3.0945 d5m 3.1085 3.1085 2.7911 2.3764 2.1827 2.1827 D5m 3.8651 4.4138 4.1490 4.3462 4.3390 4.1510 EP12 0.2505 0.2756 0.5710 0.4557 0.6294 0.6294 CP2 0.3066 0.3066 0.2939 0.3556 0.2612 0.2612 EP23 0.5133 0.5133 0.4304 0.4986 0.5266 0.5266 CP3 0.0180 0.0833 0.0180 0.0180 0.3034 0.3034 EP34 0.5133 0.5541 0.5205 0.4624 0.5055 0.4553 CP4 0.0180 0.0180 0.3279 0.3279 0.0207 0.0207 EP45 0.5120 0.4282 0.6206 0.6195 0.4152 0.4653 CP5 0.7208 0.7208 0.2783 0.2667 0.0207 0.0207 SAG42 0.0689 0.0689 -0.3508 -0.3508 0.1333 0.1333

[0113] Table 7

[0114] Table 8 shows the conditional values for each of Examples 1-6.

[0115]

[0116]

[0117] Table 8

[0118] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0119] The above description is merely that of the preferred embodiments of the present application and of the principles of the technology employed. Those skilled in the art will understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens, characterized in that: include: A six-lens assembly comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side to the image side along the optical axis; the object side surface of the fifth lens is convex; and the sixth lens has negative optical power; a spacer group, comprising a fifth spacer disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens; as well as a lens barrel, wherein the six-piece lens group and the spacer group are placed in the lens barrel; The air gap T56 between the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer along the optical axis satisfy the following conditions: <CP5 / T56<0.9; The inner diameter d5m of the image side surface of the fifth spacer and the outer diameter D5m of the image side surface of the fifth spacer satisfy: 1.2 <D5m / d5m<2.0。 2. The optical imaging lens according to claim 1, wherein: The spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. Among them, the center thickness CT2 of the second lens on the optical axis, the distance EP12 between the first spacer and the second spacer along the optical axis, the inner diameter d2s of the object side surface of the second spacer and the outer diameter D2s of the object side surface of the second spacer satisfy: 2.55<(D2s+d2s) / (D2s-d2s)×CT2 / EP12<6.

3.

3. The optical imaging lens according to claim 1, wherein: The spacer set further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. Among them, the air gap T23 between the second lens and the third lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer along the optical axis, and the distance EP23 between the second spacer and the third spacer along the optical axis satisfy: 0.9<(CP2+EP23) / (T23+CT3)<2.

55.

4. The optical imaging lens according to claim 1, wherein: The spacer set further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. The refractive index N2 of the second lens, the refractive index N3 of the third lens, the inner diameter d2m of the image side surface of the second spacer, and the inner diameter d3m of the image side surface of the third spacer satisfy the following equation: 0.5 <N2 / N3×d2m / d3m≤1.0。 5. The optical imaging lens according to claim 1, wherein: The spacer set further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. Among them, the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the maximum thickness CP2 of the second spacer along the optical axis, and the maximum thickness CP3 of the third spacer along the optical axis satisfy: -20.9≤CP2 / CP3×R5 / R6<31.

8.

6. The optical imaging lens according to claim 1, wherein: The spacer set further includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. The distance EP34 between the third spacer and the fourth spacer along the optical axis and the on-axis distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the maximum effective radius vertex of the image side surface of the fourth lens satisfy: -1.5 <EP34 / SAG42<8.05。 7. The optical imaging lens according to claim 1, wherein: The spacer set further includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. Among them, the distance EP34 between the third spacer and the fourth spacer along the optical axis, the distance EP45 between the fourth spacer and the fifth spacer along the optical axis, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: 0.7≤EP45 / EP34×|f5 / f4|<3.

05.

8. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, wherein the reflectivity of the fourth spacer to light in the visible light range is less than or equal to 3%. The inner diameter d4s of the object-side surface of the fourth spacer, the outer diameter D4s of the object-side surface of the fourth spacer, and the maximum thickness CP4 of the fourth spacer along the optical axis satisfy: 3.3≤(D4s-d4s) / CP4<118.

45.

9. The optical imaging lens according to claim 1, wherein: The spacer group further includes a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. The maximum thickness CP4 of the fourth spacer along the optical axis, the maximum thickness CP5 of the fifth spacer along the optical axis, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens meet the following conditions: -30.05 <CP5 / CP4×R9 / R10<2.15。 10. The optical imaging lens according to any one of claims 1 to 9, wherein: A refractive index N1 of the first lens, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a refractive index N4 of the fourth lens, a refractive index N5 of the fifth lens, and a refractive index N6 of the sixth lens satisfy the following relationship: 1.0≤(N1+N3+N5) / (N2+N4+N6)<1.1.

Images