Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which comprises a lens barrel and a lens group and a spacer element group contained in the lens barrel, wherein the lens group is composed of a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer element group comprises a fifth spacer element, which is disposed between the fifth lens and the sixth lens and contacts with the image side surface of the fifth lens; and the optical imaging lens satisfies: ‑2.40≤f6 / (d0m‑d5m)≤‑1.40 and 11.30≤d0m / |SAG62|≤18.50.

Description

Technical Field

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

[0002] In recent years, with the ever-changing consumer demand, the requirements for optical imaging lenses have gradually become more complex and diversified. In different application scenarios, the performance of optical imaging lenses varies.

[0003] Six-element optical imaging lenses have become mainstream and are widely used in mobile phones, tablet computers, VR helmets, smart watches, smart glasses, etc. In the prior art, some optical imaging lenses adjust certain components in the device to reduce the risk of ghost images, but this often leads to a poor convergence of the modulation transfer function (MTF) curve of the optical imaging lens, thereby affecting the imaging quality of the optical imaging lens. Summary of the invention

[0004] The present application provides an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group contained in the lens barrel, wherein the lens group consists of a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer element group includes a fifth spacer element, which is placed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; the optical imaging lens satisfies: -2.40≤f6 / (d0m-d5m)≤-1.40 and 11.30≤d0m / |SAG62|≤18.50; wherein f6 is the effective focal length of the sixth lens, d0m is the inner diameter of the image side end surface of the lens barrel, d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG62 is the on-axis distance between the intersection of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens.

[0005] According to an exemplary embodiment of the present application, the spacer element group also includes a fourth spacer element, which is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 1.50≤EP45 / CT4≤1.85, wherein EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

[0006] According to an exemplary embodiment of the present application, the spacer element group also includes a fourth spacer element, which is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: -2.25≤(R7+R8) / d4s≤-1.30, wherein R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element.

[0007] According to an exemplary embodiment of the present application, the spacer element group also includes a third spacer element, which is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 0.75≤|d3s / R6|≤1.15, wherein d3s is the inner diameter of the object side surface of the third spacer element, and R6 is the curvature radius of the image side surface of the third lens.

[0008] According to an exemplary embodiment of the present application, the spacer element group also includes a third spacer element, which is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 1.35≤(R4+R5) / D3s≤2.60, wherein R4 is the curvature radius of the image side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, and D3s is the outer diameter of the object side surface of the third spacer element.

[0009] According to an exemplary embodiment of the present application, the spacer element group also includes a third spacer element and a fourth spacer element, the third spacer element is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the fourth spacer element is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 3.35≤f4 / EP34≤10.55, wherein f4 is the effective focal length of the fourth lens, and EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis.

[0010] According to an exemplary embodiment of the present application, the spacer element group also includes a third spacer element and a fourth spacer element, the third spacer element is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the fourth spacer element is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 2.10≤f34 / EP34≤4.10, wherein f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis.

[0011] According to an exemplary embodiment of the present application, the spacer element group also includes a second spacer element and a third spacer element, the second spacer element is placed between the second lens and the third lens and in contact with the image side surface of the second lens, and the third spacer element is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 0.40≤EP23 / CT3≤0.70, wherein EP23 is the distance between the second spacer element and the third spacer element along the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0012] According to an exemplary embodiment of the present application, the spacer element group also includes a second spacer element and a third spacer element, the second spacer element is placed between the second lens and the third lens and in contact with the image side surface of the second lens, and the third spacer element is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 4.35≤(R5+R6) / EP23≤22.30, wherein R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and EP23 is the distance between the second spacer element and the third spacer element along the optical axis.

[0013] According to an exemplary embodiment of the present application, the spacer element group also includes a second spacer element, which is placed between the second lens and the third lens and in contact with the image side surface of the second lens; the optical imaging lens satisfies: 4.20≤d2s*N2 / Yc21≤4.75, wherein d2s is the inner diameter of the object side surface of the second spacer element, N2 is the refractive index of the second lens, and Yc21 is the distance from the inflection point closest to the optical axis on the image side surface of the second lens to the optical axis.

[0014] According to an exemplary embodiment of the present application, the spacer element group also includes a first spacer element, which is placed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 3.80≤(D0s-DT11) / EP01≤4.65, wherein D0s is the outer diameter of the object side end surface of the lens barrel, DT11 is the maximum effective radius of the object side surface of the first lens, and EP01 is the distance between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis.

[0015] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: -0.10≤d0s / R1*(f / L)≤0.30, wherein d0s is the inner diameter of the object side end surface of the lens barrel, R1 is the radius of curvature of the object side surface of the first lens, f is the total effective focal length of the optical imaging lens, and L is the maximum length of the lens barrel along the optical axis.

[0016] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 0.40≤(DT61-DT11) / d0s≤0.60, wherein DT11 is the maximum effective radius of the object side of the first lens, DT61 is the maximum effective radius of the object side of the sixth lens, and d0s is the inner diameter of the object side end surface of the lens barrel.

[0017] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 0.50≤(Yc52+Yc62) / d5m≤0.65, wherein YC52 is the distance from the inflection point closest to the optical axis in the image side surface of the fifth lens to the optical axis, and YC62 is the distance from the inflection point closest to the optical axis in the image side surface of the sixth lens to the optical axis.

[0018] According to an exemplary embodiment of the present application, the object side surface of the second lens is convex, and the image side surface is concave. The object side surface of the third lens is convex, and the image side surface is convex. The object side surface of the fourth lens is concave, and the image side surface is convex. The object side surface of the fifth lens is convex, and the image side surface is concave. The object side surface of the sixth lens is convex, and the image side surface is concave.

[0019] The optical imaging lens provided by the present application helps to control the aperture of the sixth lens and reduce the light height on the image side surface of the sixth lens by controlling the ratio of the focal length of the sixth lens to the inner diameter of the image side end surface of the lens barrel and the inner diameter difference of the image side surface of the fifth spacing element. This can not only effectively intercept non-imaging light from reaching the imaging surface and reduce the risk of ghost images, but also minimize the decrease in illumination. However, it is necessary to optimize the smoothness of the sixth lens to balance the MTF curve. Therefore, by controlling the curvature of the sixth lens, the ratio of the inner diameter of the image side surface of the fifth spacing element to the on-axis distance between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is within a reasonable range, which helps to improve the inclination angle of the sixth lens and the smoothness of the surface shape, minimize the risk of ghost images, and achieve a better balance of MTF, thereby improving the realism and clarity of imaging of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0021] Figure 1 A schematic diagram showing the structural arrangement and some parameters of an optical imaging lens of the present application;

[0022] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown;

[0023] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown;

[0024] Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown;

[0025] Figure 5 The axial chromatic aberration curve (A1), astigmatism curve (B1), distortion curve (C1) and magnification chromatic aberration curve (D1) of the optical imaging lenses of Examples 1 to 3 of the present application are shown;

[0026] Figure 6 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown;

[0027] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown;

[0028] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown;

[0029] Fig. 9 The axial chromatic aberration curve (A2), astigmatism curve (B2), distortion curve (C2) and magnification chromatic aberration curve (D2) of the optical imaging lenses of Examples 4 to 6 of the present application are shown;

[0030] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0031] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0032] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0033] Fig.13 The axial chromatic aberration curve (A3), astigmatism curve (B3), distortion curve (C3) and magnification chromatic aberration curve (D3) of the optical imaging lenses of Examples 7 to 9 of the present application are shown;

[0034] Fig.14 The stray light spot diagram of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=18.46 are satisfied;

[0035] Fig.15 The MTF curve of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=18.46 are satisfied;

[0036] Fig.16The stray light spot diagram of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=10 are satisfied;

[0037] Fig.17 The MTF curve of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=10 are satisfied;

[0038] Fig.18 The stray light spot diagram of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=23 are satisfied;

[0039] Fig.19 The MTF curve of the optical imaging lens of the present application is shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=23 are satisfied. DETAILED DESCRIPTION

[0040] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0041] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The paraxial region refers to the region near the optical axis. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0044] 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 exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer element groups in the various embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer element groups, etc. of the embodiment.

[0047] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0048] Figure 1 The schematic diagram of the structure arrangement and some parameters of an optical imaging lens of the present application is shown as an example to facilitate a better understanding of the present application. Figure 1 As shown, d0s is the inner diameter of the object side end face of the lens barrel, d0m is the inner diameter of the image side end face of the lens barrel, d3s is the inner diameter of the object side face of the third spacing element, d4s is the inner diameter of the object side face of the fourth spacing element, d5m is the inner diameter of the image side face of the fifth spacing element, D0s is the outer diameter of the object side end face of the lens barrel, D3s is the outer diameter of the object side face of the third spacing element, EP01 is the distance between the object side end face of the lens barrel and the object side face of the first spacing element along the optical axis, EP23 is the distance between the second spacing element and the third spacing element along the optical axis, EP34 is the distance between the third spacing element and the fourth spacing element along the optical axis, EP45 is the distance between the fourth spacing element and the fifth spacing element along the optical axis, and L is the maximum length of the lens barrel along the optical axis.

[0049] refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig.10 , Fig.11 and Fig.12 The present application provides an optical imaging lens, which may include a lens group, wherein the number of lenses with optical power in the lens group is six, and may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Each lens has at least an object side surface facing the side of the subject and an image side surface facing the side of the imaging surface. Each lens has an effective diameter area that can pass light and a non-effective diameter area surrounding the effective diameter area that cannot pass light. Among the first lens to the sixth lens, any two adjacent lenses may have a spacing distance on the optical axis, and the spacing distance may be an air spacing.

[0050] In an exemplary embodiment, the first lens may have negative power. The second lens may have negative power or positive power. The third lens may have positive power. The fourth lens may have positive power. The fifth lens may have negative power. The sixth lens may have negative power.

[0051] In an exemplary embodiment, the object side surface of the first lens is convex or concave, and the image side surface is concave or convex. The object side surface of the second lens is convex, and the image side surface is concave. The object side surface of the third lens is convex, and the image side surface is convex. The object side surface of the fourth lens is concave, and the image side surface is convex. The object side surface of the fifth lens is convex, and the image side surface is concave. The object side surface of the sixth lens is convex, and the image side surface is concave.

[0052] In an exemplary embodiment, the optical imaging lens further includes a spacer element group, which may include at least one spacer element, which is disposed between the lenses and located in the non-effective diameter region of the lenses. It should be understood that the present application does not specifically limit the number of spacer elements, and at least one spacer element is disposed between any two adjacent lenses, and the entire optical imaging lens may also include any number of spacer elements. The spacer element helps the optical imaging lens intercept excess refractive and reflective light paths, reduce stray light and ghost images, and improve imaging quality.

[0053] In an exemplary embodiment, the optical imaging lens further includes a lens barrel. The lens group and the spacer element group are placed in the lens barrel. The lens barrel includes an object side end face, an image side end face, an outer annular surface, and an inner annular surface, wherein the end face of the lens barrel closest to the object side is the object side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface, and the inner annular surface is stepped.

[0054] In an exemplary embodiment, the optical imaging lens may further include an aperture for limiting the light beam, which is conducive to converging the light entering the optical lens, reducing the maximum aperture of the optical lens, and reducing the assembly sensitivity of the system to further improve the imaging quality of the optical lens. It should be noted that the aperture can be set between or on one side of any lens according to actual needs. Exemplarily, the aperture is set between the first lens and the second lens.

[0055] In an exemplary embodiment, the spacer element group includes a fifth spacer element, which is placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the optical imaging lens satisfies: -2.40≤f6 / (d0m-d5m)≤-1.40 and 11.30≤d0m / |SAG62|≤18.50; wherein f6 is the effective focal length of the sixth lens, d0m is the inner diameter of the image side end surface of the lens barrel, d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG62 is the on-axis distance between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens.

[0056] The optical imaging lens provided by the present application helps to control the aperture of the sixth lens and reduce the light height on the image side surface of the sixth lens by controlling the ratio of the focal length of the sixth lens to the inner diameter of the image side end surface of the lens barrel and the inner diameter difference of the image side surface of the fifth spacing element. This can not only effectively intercept non-imaging light from reaching the imaging surface and reduce the risk of ghost images, but also minimize the decrease in illumination. However, it is necessary to optimize the smoothness of the sixth lens to balance the MTF curve. Therefore, by controlling the curvature of the sixth lens, the ratio of the inner diameter of the image side surface of the fifth spacing element to the on-axis distance between the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens is within a reasonable range, which helps to improve the inclination angle of the sixth lens and the smoothness of the surface shape, minimize the risk of ghost images, and achieve a better balance of MTF, thereby improving the realism and clarity of imaging of the optical imaging lens.

[0057] Fig.14 and Fig.15 The stray light spot diagram and MTF curve of the optical imaging lens of the present application are respectively shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=18.46;

[0058] Fig.16 and Fig.17 The stray light spot diagram and MTF curve of the optical imaging lens of the present application are respectively shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=10;

[0059] Fig.18 and Fig.19 The stray light spot diagram and MTF curve of the optical imaging lens of the present application are respectively shown when f6 / (d0m-d5m)=-1.97 and d0m / |SAG62|=23 are satisfied.

[0060] Fig.14 and Fig.15 The optical imaging lens in satisfies the range defined by the conditional formula f6 / (d0m-d5m) and d0m / |SAG62| in this application, and controls the ratio of the focal length of the sixth lens to the difference between the inner diameter of the image side end face of the lens barrel and the inner diameter of the image side face of the fifth spacer element, thereby controlling the aperture of the sixth lens and reducing the light height on the image side face of the sixth lens, which can effectively intercept non-imaging light from reaching the imaging surface and reduce the risk of ghost images. Under the premise of minimizing the decrease in illumination as much as possible, by controlling the curvature of the sixth lens, the ratio of the inner diameter of the image side face of the fifth spacer element to the on-axis distance between the intersection of the image side face of the sixth lens and the optical axis to the vertex of the effective radius of the image side face of the sixth lens is controlled within a suitable range, which helps to improve the inclination angle and smoothness of the surface shape of the sixth lens, minimize the risk of ghost images, and reduce the risk of ghost images. The MTF curve is concentrated and the defocus performance is good, which helps to improve the realism and clarity of the imaging of the optical imaging lens. Fig.14 It can be seen that the stray light spot is normal. Fig.15 It can be seen that the MTF curve is more concentrated, and the stray light spot and MTF curve are well balanced.

[0061] Fig.16 and Fig.17 Although the conditional formula f6 / (d0m-d5m) of the optical imaging lens satisfies the range defined in this application, Fig.16 It can be seen from the figure that the stray light spot is normal and can reduce the risk of ghost images. However, the conditional expression d0m / |SAG62| exceeds the lower limit of the range specified in this application. Fig.17 It can be seen that the MTF curve is offset, the defocus performance is deteriorating, and there is no good balance between the stray light spot and the MTF curve, which will affect the realism and clarity of the optical imaging lens.

[0062] Fig.18 and Fig.19 Although the conditional formula f6 / (d0m-d5m) of the optical imaging lens satisfies the range defined in this application, Fig.19 It can be seen from the figure that the MTF curve is relatively concentrated, but the conditional expression d0m / |SAG62| exceeds the upper limit of the range specified in this application. Fig.18 It can be seen that the stray light spot is abnormal, and there is an obvious circular smear. The stray light spot and the MTF curve are not well balanced, which will affect the realism and clarity of the optical imaging lens.

[0063] In an exemplary embodiment, the spacer element group further includes a fourth spacer element, which is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 1.50≤EP45 / CT4≤1.85, wherein EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. By controlling the above conditions, the thickness ratio of the edge thickness of the fifth lens to the middle thickness of the fourth lens can be effectively controlled within a reasonable range, ensuring that the edge thickness of the fifth lens and the middle thickness of the fourth lens have good stability when the lens is under external conditions such as high humidity, high temperature, and falling, so as to ensure that the imaging effect of the lens is less affected by external interference.

[0064] In an exemplary embodiment, the spacer element group further includes a fourth spacer element, which is placed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; the optical imaging lens satisfies: -2.25≤(R7+R8) / d4s≤-1.30, wherein R7 is the radius of curvature of the object side surface of the fourth lens, R8 is the radius of curvature of the image side surface of the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element. By controlling the above conditions, the shape of the fourth lens can be reasonably controlled, which is beneficial to lens processing and ensuring the stability of the lens molding process. At the same time, the inner diameter size of the image side surface and the object side surface of the fourth spacer element can be controlled to effectively intercept non-imaging light and improve the imaging quality of the lens.

[0065] In an exemplary embodiment, the spacer element group further includes a third spacer element, which is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: 0.75≤|d3s / R6|≤1.15, wherein d3s is the inner diameter of the object side surface of the third spacer element, and R6 is the radius of curvature of the image side surface of the third lens. By controlling the above conditions, the radius of curvature of the image side surface of the third lens can be effectively controlled within a reasonable range, and the refractive index of the third lens can be controlled to ensure that the light of the edge field of view has a reasonable field angle. By controlling the inner diameter of the object side surface of the third spacer element, the off-axis aberration can be corrected to improve the imaging quality of the lens.

[0066] In an exemplary embodiment, the spacer element group further includes a third spacer element, which is placed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 1.35≤(R4+R5) / D3s≤2.60, wherein R4 is the curvature radius of the image side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, and D3s is the outer diameter of the object side surface of the third spacer element. By controlling the curvature radius of the image side surface of the second lens and the curvature radius of the object side surface of the third lens, it is helpful to connect the front and rear lens optical systems, make the imaging quality higher, and effectively intercept non-imaging light.

[0067] In an exemplary embodiment, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is placed between the third lens and the fourth lens and contacts the image side surface of the third lens, and the fourth spacer element is placed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; the optical imaging lens satisfies: 3.35≤f4 / EP34≤10.55, wherein f4 is the effective focal length of the fourth lens, and EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis. By controlling the above conditions, the shape and structure of the fourth lens can be effectively controlled, the difficulty of lens molding and processing can be reduced, and the imaging quality of the fourth lens can be improved.

[0068] In an exemplary embodiment, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is placed between the third lens and the fourth lens and contacts the image side surface of the third lens, and the fourth spacer element is placed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; the optical imaging lens satisfies: 2.10≤f34 / EP34≤4.10, wherein f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis. By controlling the edge thickness of the fourth lens, the fourth lens and the third spacer element and the fourth spacer element can better support each other, improve the support stability, and minimize the difficulty and risk of assembly. At the same time, by controlling the combined focal length of the third lens and the fourth lens, it is helpful to connect the front and rear lens optical systems, improve the imaging quality, and reduce the imaging distortion.

[0069] In an exemplary embodiment, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is placed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is placed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 0.40≤EP23 / CT3≤0.70, wherein EP23 is the distance between the second spacer element and the third spacer element along the optical axis, and CT3 is the center thickness of the third lens on the optical axis. By controlling the above conditions, the thickness ratio of the middle thickness to the edge thickness of the third lens can be effectively controlled within a reasonable range, the stability of the molding of the third lens can be ensured, and the risk of assembly deformation of the third lens during the assembly process can be effectively avoided.

[0070] In an exemplary embodiment, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is placed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is placed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 4.35≤(R5+R6) / EP23≤22.30, wherein R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, and EP23 is the distance between the second spacer element and the third spacer element along the optical axis. By controlling the above conditions, the shape of the third lens can be reasonably controlled, which is beneficial to the processing of the third lens and ensures the stability of the lens molding process. At the same time, by controlling the distance between the second spacer element and the third spacer element along the optical axis, the field curvature quality of the lens imaging can be effectively controlled, and mechanical vibrations such as falling can be avoided to cause collisions and scratches between lenses.

[0071] In an exemplary embodiment, the spacer element group further includes a second spacer element, which is placed between the second lens and the third lens and contacts the image side surface of the second lens; the optical imaging lens satisfies: 4.20≤d2s*N2 / Yc21≤4.75, wherein d2s is the inner diameter of the object side surface of the second spacer element, N2 is the refractive index of the second lens, and Yc21 is the distance from the inflection point closest to the optical axis in the image side surface of the second lens to the optical axis. By controlling the above conditions, the uniformity of the second lens structure can be effectively controlled, which is beneficial to the molding and processing of the lens. At the same time, by controlling the inner diameter of the object side surface of the second spacer element, unnecessary light can be effectively intercepted to improve the imaging quality of the lens.

[0072] In an exemplary embodiment, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 3.80≤(D0s-DT11) / EP01≤4.65, wherein D0s is the outer diameter of the object side end surface of the lens barrel, DT11 is the maximum effective radius of the object side surface of the first lens, and EP01 is the distance between the object side end surface of the lens barrel and the object side surface of the first spacer element along the optical axis. By controlling the outer diameter of the object side end surface of the lens barrel and the maximum effective diameter of the object side surface of the first lens, the radial step difference between the first lens and the lens barrel can be reasonably controlled to prevent the problem of poor assembly stability due to excessive step difference between the lens and the spacer element during the assembly process.

[0073] In an exemplary embodiment, the optical imaging lens satisfies: -0.10≤d0s / R1*(f / L)≤0.30, wherein d0s is the inner diameter of the object side end surface of the lens barrel, R1 is the radius of curvature of the object side surface of the first lens, f is the total effective focal length of the optical imaging lens, and L is the maximum length of the lens barrel along the optical axis. By controlling the maximum length of the lens barrel along the optical axis, the stability of the arrangement of the lens in the lens barrel is ensured, and the connection of the front and rear optical systems is ensured; by controlling the total effective focal length of the lens, the optical system is ensured to be able to better image to the imaging surface, and the imaging quality of the lens is improved; by controlling the inner diameter of the object side end surface of the lens barrel and the radius of curvature of the object side surface of the first lens, the stability of the structural arrangement is ensured, and the assembly stability of the lens is improved.

[0074] In an exemplary embodiment, the optical imaging lens satisfies: 0.40≤(DT61-DT11) / d0s≤0.60, wherein DT11 is the maximum effective radius of the object side of the first lens, DT61 is the maximum effective radius of the object side of the sixth lens, and d0s is the inner diameter of the object side end face of the lens barrel. By controlling the overall step difference of the lens and the outer diameter of the first lens, the uniformity of the lens barrel structure transition is ensured, the molding difficulty is reduced, and the supporting structure is ensured to have sufficient design space and is conducive to reducing the assembly difficulty.

[0075] In an exemplary embodiment, the optical imaging lens satisfies: 0.50≤(Yc52+Yc62) / d5m≤0.65, wherein YC52 is the distance from the inflection point closest to the optical axis in the image side surface of the fifth lens to the optical axis, YC62 is the distance from the inflection point closest to the optical axis in the image side surface of the sixth lens to the optical axis, and d5m is the inner diameter of the image side surface of the fifth spacing element. By controlling the inner diameter of the image side surface of the fifth spacing element, unnecessary light can be effectively intercepted, and by controlling the distance from the inflection point closest to the optical axis in the image side surface of the fifth lens to the optical axis and the distance from the inflection point closest to the optical axis in the image side surface of the sixth lens to the optical axis, the volume and weight of the fifth spacing element can be controlled, the difficulty of mold processing and molding can be reduced, and the imaging quality can be ensured.

[0076] In an exemplary embodiment, the spacer element group further includes a sixth spacer element, which is disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, thereby improving the stability of lens mounting.

[0077] Those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0078] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings. Example 1

[0079] Figure 2 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 1 of the present application. Figure 2 As shown, the optical imaging lens comprises a lens barrel P0, a six-piece lens group disposed in the lens barrel P0, and a spacer element group. The six-piece lens group comprises, 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 (not shown) is disposed between the first lens E1 and the second lens E2.

[0080] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0081] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5 and a sixth spacer element P6. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5. The sixth spacer element P6 is disposed on the image side of the sixth lens E6 and the object-side surface of the sixth spacer element P6 is at least partially in contact with the image-side surface S12 of the sixth lens E6.

[0082] In the example, a filter (not shown) may be further disposed between the sixth lens E6 and the imaging surface S15 (not shown), and 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 sequence and is finally imaged on the imaging surface S15.

[0083] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0084] Table 1

[0085]

[0086] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0087] (1);

[0088] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric surface S1 to S12 in Example 1.

[0089] Table 2

[0090] Example 2

[0091] Figure 3 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of the present application. Figure 3 As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0092] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0093] The difference between this embodiment and the first embodiment is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions. Example 3

[0094] Figure 4 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of the present application. Figure 4 As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0095] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0096] The difference between this embodiment and the first embodiment is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions.

[0097] Figure 5 (A1) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 5 (B1) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 1 to 3, which represent the meridional image curvature and the sagittal image curvature. Figure 5 (C1) in FIG. 1 shows the distortion curves of the optical imaging lenses of Examples 1 to 3, which represent the distortion values ​​corresponding to different field angles. Figure 5 (D1) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figure 5 It can be seen that the optical imaging lenses provided in Examples 1 to 3 can achieve good imaging quality. Example 4

[0098] Figure 6 FIG. 4 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of the present application. Figure 6 As shown, the optical imaging lens comprises a lens barrel P0, a six-piece lens group disposed in the lens barrel P0, and a spacer element group. The six-piece lens group comprises, 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 (not shown) is disposed between the first lens E1 and the second lens E2.

[0099] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0100] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5 and a sixth spacer element P6. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5. The sixth spacer element P6 is disposed on the image side of the sixth lens E6 and the object-side surface of the sixth spacer element P6 is at least partially in contact with the image-side surface S12 of the sixth lens E6.

[0101] In the example, a filter (not shown) may be further disposed between the sixth lens E6 and the imaging surface S15 (not shown), and 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 sequence and is finally imaged on the imaging surface S15.

[0102] Table 3 shows the basic parameters of the lens group of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0103] Table 3

[0104]

[0105] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S12 in Example 4.

[0106] Table 4

[0107] Example 5

[0108] Figure 7 FIG. 5 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of the present application. Figure 7 As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0109] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0110] The difference between this embodiment and Embodiment 4 is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions. Example 6

[0111] Figure 8 FIG. 6 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 6 of the present application. Figure 8 As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0112] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0113] The difference between this embodiment and Embodiment 4 is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions.

[0114] Fig. 9 (A2) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig. 9 (B2) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional image curvature and the sagittal image curvature. Fig. 9 (C2) in FIG. 5 shows the distortion curves of the optical imaging lenses of Examples 4 to 6, which represent the distortion values ​​corresponding to different field angles. Fig. 9 (D2) in FIG. 4 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig. 9 It can be seen that the optical imaging lenses provided in Examples 4 to 6 can achieve good imaging quality. Example 7

[0115] Fig.10 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of the present application. Fig.10 As shown, the optical imaging lens comprises a lens barrel P0, a six-piece lens group disposed in the lens barrel P0, and a spacer element group. The six-piece lens group comprises, 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 (not shown) is disposed between the first lens E1 and the second lens E2.

[0116] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has negative optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative optical power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0117] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5 and a sixth spacer element P6. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5. The sixth spacer element P6 is disposed on the image side of the sixth lens E6 and the object-side surface of the sixth spacer element P6 is at least partially in contact with the image-side surface S12 of the sixth lens E6.

[0118] In the example, a filter (not shown) may be further disposed between the sixth lens E6 and the imaging surface S15 (not shown), and 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 sequence and is finally imaged on the imaging surface S15.

[0119] Table 5 shows the basic parameters of the lens group of the optical imaging lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0120] Table 5

[0121]

[0122] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S12 in Example 7.

[0123] Table 6

[0124] Example 8

[0125] Fig.11 FIG. 8 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 8 of the present application. Fig.11As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0126] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0127] The difference between this embodiment and Embodiment 7 is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions. Example 9

[0128] Fig.12 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 9 of the present application. Fig.12 As shown, the optical imaging lens includes a lens barrel P0, a six-piece lens group arranged in the lens barrel P0, and a spacer element group. The six-piece lens group includes: 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 in order from the object side to the image side along the optical axis. A stop STO (not shown) is arranged between the first lens E1 and the second lens E2. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0129] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0130] The difference between this embodiment and Embodiment 7 is that the lens barrel P0 and at least some elements in the spacer element group have different structural dimensions.

[0131] Fig.13 (A3) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig.13 (B3) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 7 to 9, which represent the meridional image curvature and the sagittal image curvature. Fig.13(C3) in FIG. 1 shows the distortion curves of the optical imaging lenses of Examples 7 to 9, which represent the distortion values ​​corresponding to different field angles. Fig.13 (D3) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig.13 It can be seen that the optical imaging lenses provided in Examples 7 to 9 can achieve good imaging quality.

[0132] Table 7 shows the parameter values ​​of f, f1, f2, f3, f34, f4, f5, f6, SAG62, DT11, DT61, Yc21, Yc52 and Yc62 of each embodiment in Embodiment 1 to Embodiment 9. The units of the parameters listed in Table 7 are all millimeters (mm).

[0133] Table 7

[0134]

[0135] Table 8 gives the values ​​of parameters of at least some elements in the lens barrel P0 and the spacer element group in each embodiment from Embodiment 1 to Embodiment 9. Among them, some parameters can be calculated according to Figure 1 The units of the parameters listed in Table 8 are all millimeters (mm).

[0136] Table 8

[0137]

[0138] In summary, the optical imaging lenses in Examples 1 to 9 satisfy the relationship shown in Table 9.

[0139] Table 9

[0140]

[0141] The present application also provides an electronic device equipped with the optical imaging lens described above. The electronic device can be a wearable device such as a VR helmet, a smart watch, and smart glasses, an independent imaging device such as a digital camera, or a mobile electronic device such as a mobile phone or a tablet computer.

[0142] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that: include: A lens group, consisting of a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; a spacer element group, comprising a fifth spacer element, the fifth spacer element being disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; as well as A lens barrel, accommodating the lens group and the spacer element group; The optical imaging lens satisfies: -2.40≤f6 / (d0m-d5m)≤-1.40 and 11.30≤d0m / |SAG62|≤18.50; Among them, f6 is the effective focal length of the sixth lens, d0m is the inner diameter of the image side end face of the lens barrel, d5m is the inner diameter of the image side face of the fifth spacing element, and SAG62 is the on-axis distance between the intersection of the image side face of the sixth lens and the optical axis to the effective radius vertex of the image side face of the sixth lens.

2. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element, the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; The optical imaging lens satisfies: 1.50≤EP45 / CT4≤1.85, wherein EP45 is the distance between the fourth spacing element and the fifth spacing element along the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element, the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; The optical imaging lens satisfies: -2.25≤(R7+R8) / d4s≤-1.30, wherein R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element, the third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third lens; The optical imaging lens satisfies: 0.75≤|d3s / R6|≤1.15, wherein d3s is the inner diameter of the object side surface of the third spacing element, and R6 is the curvature radius of the image side surface of the third lens.

5. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element, the third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third lens; The optical imaging lens satisfies: 1.35≤(R4+R5) / D3s≤2.60, wherein R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, and D3s is the outer diameter of the object side surface of the third spacing element.

6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; The optical imaging lens satisfies: 3.35≤f4 / EP34≤10.55, wherein f4 is the effective focal length of the fourth lens, and EP34 is the distance between the third spacing element and the fourth spacing element along the optical axis.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; The optical imaging lens satisfies: 2.10≤f34 / EP34≤4.10, wherein f34 is the combined focal length of the third lens and the fourth lens, and EP34 is the distance between the third spacing element and the fourth spacing element along the optical axis.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; The optical imaging lens satisfies: 0.40≤EP23 / CT3≤0.70, wherein EP23 is the distance between the second spacing element and the third spacing element along the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

9. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens; The optical imaging lens satisfies: 4.35≤(R5+R6) / EP23≤22.30, wherein R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and EP23 is the distance between the second spacing element and the third spacing element along the optical axis.

10. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element, the second spacer element is disposed between the second lens and the third lens and is in contact with the image side surface of the second lens; The optical imaging lens satisfies: 4.20≤d2s*N2 / Yc21≤4.75, wherein d2s is the inner diameter of the object side surface of the second spacer element, N2 is the refractive index of the second lens, and Yc21 is the distance from the inflection point on the image side surface of the second lens closest to the optical axis to the optical axis.

11. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element, the first spacer element being disposed between the first lens and the second lens and in contact with the image side surface of the first lens; The optical imaging lens satisfies: 3.80≤(D0s-DT11) / EP01≤4.65, wherein D0s is the outer diameter of the object side end surface of the lens barrel, DT11 is the maximum effective radius of the object side surface of the first lens, and EP01 is the distance between the object side end surface of the lens barrel and the object side surface of the first spacing element along the optical axis.

12. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The optical imaging lens satisfies: -0.10≤d0s / R1*(f / L)≤0.30, wherein d0s is the inner diameter of the object side end surface of the lens barrel, R1 is the radius of curvature of the object side surface of the first lens, f is the total effective focal length of the optical imaging lens, and L is the maximum length of the lens barrel along the optical axis.

13. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The optical imaging lens satisfies: 0.40≤(DT61-DT11) / d0s≤0.60, wherein DT11 is the maximum effective radius of the object side of the first lens, DT61 is the maximum effective radius of the object side of the sixth lens, and d0s is the inner diameter of the object side end surface of the lens barrel.

14. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The optical imaging lens satisfies: 0.50≤(Yc52+Yc62) / d5m≤0.65, wherein YC52 is the distance from the inflection point on the image side surface of the fifth lens closest to the optical axis to the optical axis, and YC62 is the distance from the inflection point on the image side surface of the sixth lens closest to the optical axis to the optical axis.

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