Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes a lens group and a spacer element group. The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power. The spacer element group includes a fourth spacer element and a fifth spacer element. The optical imaging lens satisfies: 2.77 < (D4m - d4m) / CT5 < 4.67 and 6.40 < EP45 / T45 < 10.26; where D4m is the outer diameter of the image side surface of the fourth spacer element, d4m is the inner diameter of the image side surface of the fourth spacer element, CT5 is the central thickness of the fifth lens on the optical axis, EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, and T45 is the distance between the fourth lens and the fifth lens on the optical axis.

Description

Technical Field

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

[0002] With the continuous development of the VR / AR / XR industry, various new types of consumer electronics products have emerged in the market, such as VR head-mounted devices, smart watches, smart glasses, and drones. Among them, as an important information acquisition medium for these electronic products, optical lenses are mainly applied to scenarios such as photography, image recognition, spatial positioning, and information calculation. With the continuous iteration and function upgrade of terminal products, the requirements for the main performance of lenses, such as resolution level, size miniaturization, reliability, and stability, also need to be gradually improved.

[0003] There are still some deficiencies in the imaging quality and processability of existing six-piece optical imaging lenses. For example, the unreasonable setting of the spacer elements between adjacent lenses will affect the assembly stability of the lens and the transmission of light, thereby affecting the imaging quality of the lens. Therefore, reasonably setting the spatial arrangement and related parameters of the lenses and spacer elements to continuously improve the performance requirements of the lens and continuously innovate and seek breakthroughs in the structure has become a development direction for many lens manufacturers to enhance their competitiveness. Summary of the Invention

[0004] This application provides an optical imaging lens, which includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power. The spacer element group includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The optical imaging lens satisfies: 2.77 < (D4m - d4m) / CT5 < 4.67 and 6.40 < EP45 / T45 < 10.26; where D4m is the outer diameter of the image side surface of the fourth spacer element, d4m is the inner diameter of the image side surface of the fourth spacer element, CT5 is the central thickness of the fifth lens on the optical axis, EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and T45 is the distance between the fourth lens and the fifth lens on the optical axis.

[0005] In one embodiment, the optical imaging lens satisfies: 1.44 < CT5 / T56 < 3.83 and 3.72 < (D5s - d5s) / T56 < 16.10, where CT5 is the central thickness of the fifth lens on the optical axis, T56 is the distance between the fifth lens and the sixth lens on the optical axis, D5s is the outer diameter of the object side surface of the fifth spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element.

[0006] In one embodiment, the optical imaging lens satisfies: 10.25 < T45 / CP4 < 22.94, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis direction.

[0007] In one embodiment, the optical imaging lens satisfies: 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07, where D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, f4 is the effective focal length of the fourth lens, and CT4 is the central thickness of the fourth lens on the optical axis.

[0008] In one embodiment, the spacer element group further includes a third spacer element, which is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 1.20 < f34 / EP34 < 5.71, where f34 is the combined effective focal length of the third lens and the fourth lens, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction.

[0009] In one embodiment, the spacer element group further includes a third spacer element, which is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 1.00 mm < CT3 / N3 < 1.48 mm and 1.00 < f3 / d3s < 1.69, where CT3 is the central thickness of the third lens on the optical axis, N3 is the refractive index of the third lens, f3 is the effective focal length of the third lens, and d3s is the inner diameter of the object side surface of the third spacer element.

[0010] In one embodiment, the optical imaging lens satisfies: 2.40 < EP45 / (T45 + T56) < 4.41, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and T56 is the distance between the fifth lens and the sixth lens on the optical axis.

[0011] In one embodiment, 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 contacts the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. The optical imaging lens satisfies: 1.19 < d3s / d2m < 1.74, where d3s is the inner diameter of the object side surface of the third spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

[0012] In one embodiment, 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 contacts the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. The optical imaging lens satisfies: 2.31 < f23 / (CP2 + EP23) < 4.07, where f23 is the combined focal length of the second lens and the third lens, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and EP23 is the distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction.

[0013] In one embodiment, 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 contacts the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. The optical imaging lens satisfies: 1.23 < CT3 / EP23 < 1.77, where CT3 is the central thickness of the third lens on the optical axis, and EP23 is the distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction.

[0014] In one embodiment, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens. The optical imaging lens satisfies: -3.03 < D1m / R3 < -1.57 and -1.34 < d2s / R4 < -0.73, where D1m is the outer diameter of the image side surface of the first spacer element, R3 is the curvature radius of the object side surface of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and R4 is the curvature radius of the image side surface of the second lens.

[0015] In one embodiment, the optical imaging lens satisfies: -4.05 < SAG51 / (CP4 + T45) < -2.95, where SAG51 is the axial distance between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, and T45 is the distance between the fourth lens and the fifth lens on the optical axis.

[0016] In one embodiment, the spacer element group further includes a first spacer element. The first spacer element is disposed between the first lens and the second lens and is in contact with the image side surface of the first lens. The optical imaging lens satisfies: 2.03 < T12 / (CT1 + CP1) < 2.77, where T12 is the distance between the first lens and the second lens on the optical axis, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

[0017] In one embodiment, the spacer element group further includes a first spacer element. The first spacer element is disposed between the first lens and the second lens and is in contact with the image side surface of the first lens. The central thickness CT1 of the first lens on the optical axis is less than the central thickness CT2 of the second lens on the optical axis; the optical imaging lens satisfies: 2.19 < d1s / T12 < 3.04, where d1s is the inner diameter of the object side surface of the first spacer element, and T12 is the distance between the first lens and the second lens on the optical axis.

[0018] In one embodiment, the spacer element group further includes a third spacer element and a third auxiliary 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 third auxiliary spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third spacer element; the optical imaging lens satisfies: 1.64 < (CP3 + CP3b) / T34 < 2.21, where CP3 is the maximum thickness of the third spacer element along the optical axis direction, CP3b is the maximum thickness of the third auxiliary spacer element along the optical axis direction, and T34 is the distance between the third lens and the fourth lens on the optical axis.

[0019] In one embodiment, the optical imaging lens satisfies: 1.88 < CT4 / (CP4 + CT5) < 2.44, where CT4 is the central thickness of the fourth lens on the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, and CT5 is the central thickness of the fifth lens on the optical axis.

[0020] In one embodiment, the optical imaging lens satisfies: 1.00 < d0m / d0s < 1.63, where d0m is the inner diameter of the image side end face of the lens barrel, and d0s is the inner diameter of the object side end face of the lens barrel.

[0021] In one embodiment, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens, and the second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens; the optical imaging lens satisfies: 1.20 < EP12 / (CT2 - T23) < 3.95, where EP12 is the distance between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis, CT2 is the central thickness of the second lens on the optical axis, and T23 is the distance between the second lens and the third lens on the optical axis.

[0022] The present application also provides an optical imaging lens, which includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power. The spacer element group includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The optical imaging lens satisfies: 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07, where D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, f4 is the effective focal length of the fourth lens, and CT4 is the central thickness of the fourth lens on the optical axis.

[0023] The optical imaging lens provided by the present application includes six lenses. A fourth spacer element and a fifth spacer element are respectively disposed on the image sides of the fourth lens and the fifth lens, and satisfy 6.40 < EP45 / T45 < 10.26, which is beneficial to controlling the edge thickness of the fourth lens and thus beneficial to the processing and forming of the fourth lens; however, in this case, the distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis is more than 6.4 times the distance T45 between the fourth lens and the fifth lens on the optical axis, which easily causes stray light in the flange position (non-effective diameter region) of the fifth lens. The present application rationally distributes the optical powers of each lens and controls the conditional formula (D4m - d4m) / CT5 within a certain range, that is, 2.77 < (D4m - d4m) / CT5 < 4.67, which is beneficial to blocking the light entering the flange position (non-effective diameter region) of the fifth lens through the fourth spacer element, reducing the generation of stray light, and improving the overall imaging quality of the lens. Description of the Drawings

[0024] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings. Among them:

[0025] Figure 1 A schematic diagram showing the structural arrangement and some parameters of an optical imaging lens of the present application;

[0026] Figure 2 A schematic diagram showing the structure of the optical imaging lens of Embodiment 1 of the present application;

[0027] Figure 3 A schematic diagram showing the structure of the optical imaging lens of Embodiment 2 of the present application;

[0028] Figure 4 A schematic diagram showing the structure of the optical imaging lens of Embodiment 3 of the present application;

[0029] Figure 5 A schematic diagram showing the astigmatism curve (A1) and longitudinal chromatic aberration curve (B1) of the optical imaging lens of Embodiments 1 to 3 of the present application;

[0030] Figure 6 A schematic diagram showing the structure of the optical imaging lens of Embodiment 4 of the present application;

[0031] Figure 7 A schematic diagram showing the structure of the optical imaging lens of Embodiment 5 of the present application;

[0032] Figure 8 A schematic diagram showing the structure of the optical imaging lens of Embodiment 6 of the present application;

[0033] Figure 9 A schematic diagram showing the astigmatism curve (A2) and longitudinal chromatic aberration curve (B2) of the optical imaging lens of Embodiments 4 to 6 of the present application;

[0034] Figure 10 A schematic diagram showing the structure of the optical imaging lens of Embodiment 7 of the present application;

[0035] Figure 11 A schematic diagram showing the structure of the optical imaging lens of Embodiment 8 of the present application;

[0036] Figure 12 A schematic diagram showing the structure of the optical imaging lens of Embodiment 9 of the present application;

[0037] Figure 13 A schematic diagram showing the astigmatism curve (A3) and longitudinal chromatic aberration curve (B3) of the optical imaging lens of Embodiments 7 to 9 of the present application;

[0038] Figure 14Shows the ray diagram of the optical imaging lens when (D4m - d4m) / CT5 = 0.20 and EP45 / T45 = 7.08;

[0039] Figure 15 Shows the spot diagram on the imaging plane of the optical imaging lens when (D4m - d4m) / CT5 = 0.20 and EP45 / T45 = 7.08;

[0040] Figure 16 Shows the ray diagram of the optical imaging lens when (D4m - d4m) / CT5 = 12 and EP45 / T45 = 7.08;

[0041] Figure 17 Shows the spot diagram on the imaging plane of the optical imaging lens when (D4m - d4m) / CT5 = 12 and EP45 / T45 = 7.08;

[0042] Figure 18 Shows the ray diagram of the optical imaging lens when (D4m - d4m) / CT5 = 3.96 and EP45 / T45 = 7.08;

[0043] Figure 19 Shows the spot diagram on the imaging plane of the optical imaging lens when (D4m - d4m) / CT5 = 3.96 and EP45 / T45 = 7.08. Detailed implementation

[0044] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 reference numerals refer to the same elements.

[0045] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0046] In the drawings, for ease of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0047] In this article, the paraxial area refers to the area near the optical axis. 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 area; 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 area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, judging the concave and convex by the positive and negative R value (R refers to the radius of curvature of the paraxial area). In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0048] The solutions described in the embodiments of the present application can be simulated by software / tools such as ZEMAX and CODE V. The solutions described in some embodiments can be simulated by CODE V. In the process of simulation using the above software / tools, the surface shape of the lens can be appropriately adjusted according to the surface shape model provided by the software / tool ​​used.

[0049] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "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.

[0050] 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.

[0051] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only illustrate several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. For example, the lens group, the lens barrel, and the spacer element group in each embodiment of the present application can be arbitrarily combined, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel, the spacer element group, etc. in that embodiment.

[0052] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0053] Figure 1 Exemplarily shown is a schematic diagram of the structural arrangement and some parameters of an optical imaging lens of the present application for better understanding of the present application. As Figure 1 shown, d0s is the inner diameter of the object-side end face of the lens barrel, D5s is the outer diameter of the object-side face of the fifth spacer element, D4s is the outer diameter of the object-side face of the fourth spacer element, d5s is the inner diameter of the object-side face of the fifth spacer element, d4s is the inner diameter of the object-side face of the fourth spacer element, d3s is the inner diameter of the object-side face of the third spacer element, d2s is the inner diameter of the object-side face of the second spacer element, d1s is the inner diameter of the object-side face of the first spacer element, d2m is the inner diameter of the image-side face of the second spacer element, d4m is the inner diameter of the image-side face of the fourth spacer element, D4m is the outer diameter of the image-side face of the fourth spacer element, D1m is the outer diameter of the image-side face of the first spacer element, d0m is the inner diameter of the image-side end face of the lens barrel, CP1 is the maximum thickness of the first spacer element along the optical axis direction, CP2 is the maximum thickness of the second spacer element along the optical axis direction, CP3 is the maximum thickness of the third spacer element along the optical axis direction, CP3b is the maximum thickness of the third auxiliary spacer element along the optical axis direction, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, EP12 is the distance along the optical axis between the image-side face of the first spacer element and the object-side face of the second spacer element, EP23 is the distance along the optical axis between the image-side face of the second spacer element and the object-side face of the third spacer element, EP34 is the distance along the optical axis between the image-side face of the third spacer element and the object-side face of the fourth spacer element, and EP45 is the distance along the optical axis between the image-side face of the fourth spacer element and the object-side face of the fifth spacer element.

[0054] In an exemplary embodiment, the optical lens provided by the present application may include, for example, six lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and these six lenses are arranged in sequence from the object side to the image side along the optical axis.

[0055] In an exemplary embodiment, the first lens may have a negative focal power, the second lens may have a negative focal power, the third lens may have a positive focal power, the fourth lens may have a positive focal power, the fifth lens may have a negative focal power, and the sixth lens may have a positive focal power.

[0056] In an exemplary embodiment, the spacer element group includes a fourth spacer element disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The optical imaging lens satisfies: 2.77 < (D4m - d4m) / CT5 < 4.67, where D4m is the outer diameter of the image side surface of the fourth spacer element, d4m is the inner diameter of the image side surface of the fourth spacer element, and CT5 is the central thickness of the fifth lens on the optical axis. Satisfying 2.77 < (D4m - d4m) / CT5 < 4.67 is beneficial to blocking the light entering the flange position of the fifth lens through the fourth spacer element and improving the overall imaging quality of the lens.

[0057] In an exemplary embodiment, the spacer element group includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, and the fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens. The optical imaging lens satisfies: 6.40 < EP45 / T45 < 10.26, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and T45 is the distance between the fourth lens and the fifth lens on the optical axis. Satisfying 6.40 < EP45 / T45 < 10.26 and controlling EP45 are beneficial to controlling the edge thickness of the fourth lens and improving the formability of the fourth lens; at the same time, controlling T45 is beneficial to improving the overall resolution of the lens and the optical quality of the lens.

[0058] In an exemplary embodiment, the spacer element group of the optical imaging lens may include at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is disposed between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The second spacer element is disposed between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The third spacer element is disposed between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The fourth spacer element is disposed between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens.

[0059] In an exemplary embodiment, the spacer element group of the optical imaging lens may include a second spacer element and a second auxiliary spacer element. The second spacer element is disposed between the second lens and the third lens and at least partially contacts the image side surface of the second lens. The second auxiliary spacer element is disposed on the image side of the second spacer element and at least partially contacts the image side surface of the second spacer element.

[0060] In an exemplary embodiment, the spacer element group of the optical imaging lens may include a third spacer element and a third auxiliary spacer element. The third spacer element is disposed between the third lens and the fourth lens and at least partially contacts the image side surface of the third lens. The third auxiliary spacer element is disposed on the image side of the third spacer element and at least partially contacts the image side surface of the third spacer element.

[0061] In an exemplary embodiment, the spacer element group of the optical imaging lens may include a fifth spacer element and a fifth auxiliary spacer element. The fifth spacer element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens. The fifth auxiliary spacer element is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element.

[0062] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements may be included between any two lenses, and any number of spacer elements may also be included in the entire optical imaging lens. The spacer elements help the optical imaging lens intercept redundant refractive and reflective light paths, reducing the generation of stray light and ghost images. The spacer elements also help increase the auxiliary support between the lens and the lens barrel, which is beneficial to improving problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0063] The first aspect of the present application provides an optical imaging lens, which may include a lens group, a spacer element group, and a lens barrel. Among them, the lens group and the spacer element group are disposed in the lens barrel. The lens group includes a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is at least partially in contact with the image side surface of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens. The optical imaging lens may satisfy: 2.77 < (D4m - d4m) / CT5 < 4.67 and 6.40 < EP45 / T45 < 10.26. In the present application, the fourth spacer element and the fifth spacer element are respectively disposed on the image sides of the fourth lens and the fifth lens, and 6.40 < EP45 / T45 < 10.26, which is beneficial to controlling the edge thickness of the fourth lens, and thus beneficial to the processing and forming of the fourth lens. However, in this case, the distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis is more than 6.4 times the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, which easily causes stray light in the flange position (non-effective diameter region) of the fifth lens. By reasonably distributing the optical powers of each lens and controlling the conditional formula (D4m - d4m) / CT5 within a certain range, that is, 2.77 < (D4m - d4m) / CT5 < 4.67, the present application is beneficial to blocking the light entering the flange position of the fifth lens through the fourth spacer element, reducing the generation of stray light, and improving the overall imaging quality of the lens.

[0064] The following combines Figures 14 to 19 , and further illustrates the role of the technical solution of the present application in reducing the risk of stray light and improving the imaging quality.

[0065] Figure 14 and Figure 15 respectively show the ray diagram and the spot diagram on the imaging surface of the optical imaging lens when (D4m - d4m) / CT5 = 0.20 and EP45 / T45 = 7.08. As Figure 14 shown, a relatively large amount of stray light is generated after the non-effective rays of the optical imaging lens are reflected at the flange position (non-effective diameter region) of the fifth lens. Figure 14 In Figure 15 , (D4m - d4m) / CT5 = 0.20 of the optical imaging lens is not within the scope of the present application, and the difference between D4m and d4m is relatively small. In other words, d4m is relatively large, and the fourth spacer element cannot effectively block the light entering the flange position of the fifth lens. Therefore,

[0066] Figure 16 and Figure 17 respectively show the ray diagram of the optical imaging lens when (D4m - d4m) / CT5 = 12 and EP45 / T45 = 7.08 and the spot diagram on the imaging plane. As Figure 16 shown, a relatively large amount of stray light is generated after the non-effective rays of the optical imaging lens are reflected at the fifth lens flange position (non-effective diameter region). Figure 16 In [reference], (D4m - d4m) / CT5 = 12 of the optical imaging lens is not within the scope of this application, and the difference between D4m and d4m is relatively large. In other words, d4m is relatively small. Although it is possible to avoid the stray light generated after the rays are reflected at the fifth lens flange position (non-effective diameter region), a part of the non-effective rays enter the sixth lens through the edge of the effective diameter of the fifth lens. Therefore, Figure 17 the stray light spots presented on the imaging plane of the optical imaging lens in [reference] are relatively concentrated. Although the area is small, the energy increases, seriously affecting the imaging quality.

[0067] Figure 18 and Figure 19 respectively show the ray diagram of the optical imaging lens when (D4m - d4m) / CT5 = 3.96 and EP45 / T45 = 7.08 and the spot diagram on the imaging plane. As Figure 18 shown, the stray light at the fifth lens flange position (non-effective diameter region) of the optical imaging lens disappears. At the same time, Figure 19 the area of the stray light spots on the imaging plane of the optical imaging lens in [reference] is small. Figure 18 In [reference], (D4m - d4m) / CT5 = 3.96 of the optical imaging lens is within the scope of this application. The size design of D4m and d4m is reasonable. The fourth spacer element can block a certain amount of non-effective rays, effectively avoiding the problem of stray light generated after the non-effective rays are reflected at the fifth lens flange position (non-effective diameter region), and improving the imaging quality of the lens.

[0068] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.44 < CT5 / T56 < 3.83 and 3.72 < (D5s - d5s) / T56 < 16.10, where CT5 is the central thickness of the fifth lens on the optical axis, T56 is the spacing distance between the fifth lens and the sixth lens on the optical axis, D5s is the outer diameter of the object side of the fifth spacer element, and d5s is the inner diameter of the object side of the fifth spacer element. Reasonably allocating the central thickness of the fifth lens and the air gap between the fifth lens and the sixth lens is beneficial to improving the overall field curvature of the lens. By controlling the inner and outer diameters of the fifth spacer element, the blocking of the rays by the fifth spacer element is ensured, and the stray light quality of the lens is ensured.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 10.25 < T45 / CP4 < 22.94, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element in the optical axis direction. Satisfying 10.25 < T45 / CP4 < 22.94 is beneficial to ensuring the thickness of the fourth spacer element, ensuring the blocking of stray light between the fourth lens and the fifth lens, further intercepting the reflected light between the lenses, and is beneficial to improving the stray light quality of the lens.

[0070] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07, where D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, f4 is the effective focal length of the fourth lens, and CT4 is the central thickness of the fourth lens on the optical axis. Satisfying 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07 ensures the bending degree of the light rays in the fourth lens, and at the same time ensures that the minimum distance between the centers of the fourth spacer element and the fourth lens in the direction perpendicular to the optical axis is within an appropriate range, which can not only ensure the improvement of the lens stray light, but also ensure that the fourth spacer element does not bend and deflect. Specifically, by controlling the inner diameter of the object side surface of the fourth spacer element, it is beneficial for the fourth spacer element to block stray light, and at the same time ensure the processability of the fourth spacer element, preventing the inner diameter of the object side surface of the fourth spacer element from being too small to cause the fourth spacer element to bend and deflect, resulting in a decrease in the lens brightness, or preventing the inner diameter of the object side surface of the fourth spacer element from being too large to cause the fourth spacer element to fail to play the role of blocking stray light. In addition, satisfying 1.40 < (D4s - d4s) / CT4 < 2.07, while ensuring the improvement of the stray light between the fourth lens and the fifth lens, also limits the central thickness of the fourth lens, preventing the fourth lens from having a forming problem due to an excessive central thickness.

[0071] A second aspect of the present application provides an optical imaging lens, which may include a lens group, a spacer element group, and a lens barrel. Among them, the lens group and the spacer element group are disposed in the lens barrel. The lens group includes a first lens with a negative focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, and a sixth lens with a positive focal power, which are arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is at least partially in contact with the image side surface of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and is at least partially in contact with the image side surface of the fifth lens. The optical imaging lens may satisfy: 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07. By reasonably distributing the focal powers of the respective lenses, the fourth spacer element and the fifth spacer element are respectively disposed on the image sides of the fourth lens and the fifth lens, and the conditional expressions D4s / f4 and (D4s - d4s) / CT4 are controlled within a certain range, ensuring the bending degree of the light rays on the fourth lens, and at the same time ensuring that the minimum distance between the center of the fourth spacer element and the fourth lens in the direction perpendicular to the optical axis is within an appropriate range, which can not only ensure the improvement of the lens stray light but also ensure that the fourth spacer element does not bend and deflect.

[0072] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.20 < f34 / EP34 < 5.71, where f34 is the combined effective focal length of the third lens and the fourth lens, and EP34 is the distance along the optical axis between the image side surface of the third spacer element and the object side surface of the fourth spacer element. By restricting the combined effective focal length of the third lens and the fourth lens, it is ensured that the light rays converge first and then diverge when passing through the third lens and the fourth lens, ensuring the normal transmission of the light rays. By restricting EP34, the edge thickness of the fourth lens is ensured, which is beneficial to the lens forming of the fourth lens.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.00 mm < CT3 / N3 < 1.48 mm and 1.00 < f3 / d3s < 1.69, where CT3 is the central thickness of the third lens on the optical axis, N3 is the refractive index of the third lens, f3 is the effective focal length of the third lens, and d3s is the inner diameter of the object side surface of the third spacer element. Satisfying 1.00 mm < CT3 / N3 < 1.48 mm restricts the material selection and central thickness of the third lens, ensuring the formability of the third lens during processing; satisfying 1.00 < f3 / d3s < 1.69 ensures the minimum distance between the center of the third spacer element and the third lens in the direction perpendicular to the optical axis under the conditions of satisfying the light ray transmission and the optimal stray light quality of the third lens, preventing the third spacer element from bending and causing a decline in optical performance.

[0074] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.40 < EP45 / (T45 + T56) < 4.41, where EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis direction, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and T56 is the distance between the fifth lens and the sixth lens on the optical axis. Satisfying 2.40 < EP45 / (T45 + T56) < 4.41 limits the edge thickness of the fifth lens, prevents the problem of welding marks caused by an excessive thickness-to-thin ratio of the fifth lens, and further prevents the problems of stray light and affecting the appearance of the lens; at the same time, it improves the air gap and prevents the air gaps between the fourth lens and the fifth lens and between the fifth lens and the sixth lens from affecting the final imaging quality due to fluctuations during production.

[0075] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.19 < d3s / d2m < 1.74, where d3s is the inner diameter of the object side of the third spacer element and d2m is the inner diameter of the image side of the second spacer element. Satisfying 1.19 < d3s / d2m < 1.74 can limit the stray light generated by internal reflection in the third lens, help improve the overall stray light quality of the lens, and ensure the clarity of the lens imaging.

[0076] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.31 < f23 / (CP2 + EP23) < 4.07, where f23 is the combined focal length of the second lens and the third lens, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction. Satisfying 2.31 < f23 / (CP2 + EP23) < 4.07, by controlling CP2 and EP23, it is beneficial to control the axial dimensions of the second spacer element and the third lens, and is beneficial to limit the overall height of the lens; at the same time, limiting the combined focal length of the second lens and the third lens is beneficial to ensuring the accurate transmission of light through the second lens and the third lens, and ensuring the optical performance of the lens.

[0077] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.23 < CT3 / EP23 < 1.77, where CT3 is the central thickness of the third lens on the optical axis and EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction. Satisfying 1.23 < CT3 / EP23 < 1.77 can control the edge thickness of the third lens, which is beneficial to demolding in the lens forming process and ensures the molding of the lens. In multiple embodiments of the present application, due to the relatively large central thickness of the third lens, the above conditional formula is beneficial to ensuring the molding of the third lens.

[0078] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -3.03 < D1m / R3 < -1.57 and -1.34 < d2s / R4 < -0.73, where D1m is the outer diameter of the image side surface of the first spacer element, R3 is the curvature radius of the object side surface of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and R4 is the curvature radius of the image side surface of the second lens. Satisfying -3.03 < D1m / R3 < -1.57 is beneficial to ensuring the flange width of the second lens, ensuring the bearing area of the second lens, and at the same time ensuring the normal transmission of light; satisfying -1.34 < d2s / R4 < -0.73 is beneficial to improving stray light through the second lens and ensuring the imaging quality of the lens.

[0079] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -4.05 < SAG51 / (CP4 + T45) < -2.95, where SAG51 is the axial distance between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, and T45 is the distance between the fourth lens and the fifth lens on the optical axis. Satisfying -4.05 < SAG51 / (CP4 + T45) < -2.95 is beneficial to restricting the bending degree of the object side surface of the fifth lens, which not only ensures the tendency of light to be in a divergent state but also avoids the difficulty in lens processing caused by excessive light deflection.

[0080] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.03 < T12 / (CT1 + CP1) < 2.77, where T12 is the distance between the first lens and the second lens on the optical axis, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction. Satisfying 2.03 < T12 / (CT1 + CP1) < 2.77 is beneficial to ensuring the assembly stability of the first lens and the second lens, and at the same time restricting the size of the lens head lens (such as the first lens), and ensuring the field of view angle of the lens.

[0081] In an exemplary embodiment, the central thickness CT1 of the first lens of the optical imaging lens according to the present application on the optical axis is less than the central thickness CT2 of the second lens on the optical axis, and may satisfy: 2.19 < d1s / T12 < 3.04, where d1s is the inner diameter of the object side surface of the first spacer element, and T12 is the distance between the first lens and the second lens on the optical axis. Satisfying 2.19 < d1s / T12 < 3.04 ensures the elimination of internal reflection stray light passing through the first lens and ensures the stray light quality of the lens.

[0082] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.64 < (CP3 + CP3b) / T34 < 2.21, where CP3 is the maximum thickness of the third spacer element along the optical axis direction, CP3b is the maximum thickness of the third auxiliary spacer element along the optical axis direction, and T34 is the distance between the third lens and the fourth lens on the optical axis. Satisfying 1.64 < (CP3 + CP3b) / T34 < 2.21 is beneficial to controlling the thickness of the third spacer element and ensures that there is more space for stray light improvement between the third lens and the fourth lens.

[0083] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.88 < CT4 / (CP4 + CT5) < 2.44, where CT4 is the central thickness of the fourth lens on the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, and CT5 is the central thickness of the fifth lens on the optical axis. Satisfying 1.88 < CT4 / (CP4 + CT5) < 2.44 is beneficial to ensuring the overall uniformity of the combined thickness of the fourth lens, the fifth lens, and the fourth spacer element, improving the assembly stability, and enhancing the imaging quality of the lens.

[0084] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.00 < d0m / d0s < 1.63, where d0m is the inner diameter of the image-side end face of the lens barrel, and d0s is the inner diameter of the object-side end face of the lens barrel. Satisfying 1.00 < d0m / d0s < 1.63 can limit the sizes of the object-side end face and the image-side end face of the lens to be approximately the same, resulting in a small lens segment difference and ensuring the assembly stability of the lens.

[0085] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.20 < EP12 / (CT2 - T23) < 3.95, where EP12 is the distance between the image-side face of the first spacer element and the object-side face of the second spacer element along the optical axis direction, CT2 is the central thickness of the second lens on the optical axis, and T23 is the distance between the second lens and the third lens on the optical axis. Satisfying 1.20 < EP12 / (CT2 - T23) < 3.95 ensures the edge thickness of the second lens by controlling EP12, prevents molding problems caused by excessive edge thickness of the second lens, and limits CT2 and T23, which is beneficial to limiting the axial dimension of the lens and ensuring the assembly stability of the lens.

[0086] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the sixth lens. Optionally, the photosensitive element disposed on the image side of the sixth lens may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0087] In an exemplary embodiment, the optical lens may further include a diaphragm for restricting the light beam to further improve the imaging quality of the optical lens. Exemplarily, the diaphragm may be disposed between the second lens and the third lens. However, it should be noted that the position of the diaphragm disclosed herein is merely an example and not a limitation; in alternative embodiments, the diaphragm may also be disposed at other positions according to actual needs.

[0088] It should be understood that the present application is concerned with optimizing the performance of the six-piece lens. Specifically, the present application is concerned with, for example, how to design the combination and related dimensions of the spacer elements and lenses to improve the stray light quality of the lens, or, for example, to improve the assembly stability, resolution, lens formability, etc. The specific optical power distribution of the six lenses and the surface shapes of each lens are not the key concerns of the present application, and these settings can be adjusted accordingly as needed. That is to say, although several specific optical power distributions and surface shapes are shown for the lens group in the embodiments of the present application, it should be understood that these embodiments are merely exemplary, and the imaging lens group in the present application should not be limited to the several specific situations shown in the embodiments.

[0089] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the sixth lens are aspherical surfaces.

[0090] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0091] 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 may be changed to obtain the various results and advantages described in this specification.

[0092] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0093] Embodiment 1

[0094] Figure 2 The structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown. As Figure 2As shown, the optical imaging lens includes a lens barrel, a lens group disposed within the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0095] The first lens E1 has a negative focal power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a negative focal power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive focal power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative focal power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a positive focal power, its object side surface S11 is convex, and its image side surface S12 is concave.

[0096] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 and a second spacer element P2b disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, and a fifth spacer element P5 disposed between the fifth lens and the sixth lens.

[0097] Table 1 shows the basic parameter table of the lens group of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0098] Table 1

[0099]

[0100] 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 both aspherical surfaces, and the surface profiles of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0101] (1)

[0102] where x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 for each of the aspherical surfaces S1~S12 in Embodiment 1.

[0103] Table 2

[0104]

[0105] Example 2

[0106] Figure 3 The structural schematic diagram of the optical imaging lens according to Example 2 of the present application is shown. As Figure 3 shown, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0107] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 and a second spacer element P2b disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0108] The lens group of the optical imaging lens in this embodiment has the same structure as that of the optical imaging lens in Example 1. For its basic parameters, please refer to Tables 1 to 2, which will not be elaborated here.

[0109] The difference between this embodiment and Example 1 lies in that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different, as shown in Table 8.

[0110] Example 3

[0111] Figure 4 The structural schematic diagram of the optical imaging lens according to Example 3 of the present application is shown. As Figure 4 shown, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0112] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 and a second spacer element P2b disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0113] The lens group of the optical imaging lens in this embodiment has the same structure as that of the optical imaging lens in Embodiment 1. For the basic parameters, please refer to Tables 1 to 2, which will not be elaborated here.

[0114] The difference between this embodiment and Embodiment 1 lies in that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different, as shown in Table 8.

[0115] Figure 5 The astigmatism curves of the optical imaging lenses of Embodiments 1 to 3 are shown in (A1) of, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The longitudinal chromatic aberration curves of the optical imaging lenses of Embodiments 1 to 3 are shown in (B1) of, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figure 5 it can be seen that the optical imaging lenses provided in Embodiments 1 to 3 can achieve good imaging quality.

[0116] Embodiment 4

[0117] Figure 6 shows a schematic structural diagram of the optical imaging lens of Embodiment 4 of the present application. As Figure 6 shown, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0118] The first lens E1 has a negative optical power. Its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a negative optical power. Its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive optical power. Its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power. Its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power. Its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power. Its object side surface S11 is convex, and its image side surface S12 is concave.

[0119] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 and a second spacer element P2b disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, and a fifth spacer element P5 disposed between the fifth lens and the sixth lens.

[0120] Table 3 shows the basic parameter table of the lens group of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0121] Table 3

[0122]

[0123] In this embodiment, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and each aspherical surface profile can be defined by the formula (1) given in the above Embodiment 1. Table 4 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces S1~S12 that can be used in Embodiment 4.

[0124] Table 4

[0125]

[0126] Embodiment 5

[0127] Figure 7 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application. As Figure 7 shown, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0128] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5, and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0129] The lens group of the optical imaging lens in this embodiment has the same structure as the lens group of the optical imaging lens in Embodiment 4, and its basic parameters are shown in Tables 3 to 4, which will not be elaborated here.

[0130] The difference between this embodiment and Embodiment 4 lies in that the structural dimensions of at least some components in the lens barrel and the spacer element group are different, as shown in Table 8.

[0131] Embodiment 6

[0132] Figure 8 FIG. shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application. As Figure 8 shown, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0133] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 disposed between the second lens and the third lens, a third spacer element P3 disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 disposed between the fifth lens and the sixth lens, and a fifth auxiliary spacer element P5b.

[0134] The six-piece lens group of the optical imaging lens in this embodiment has the same structure as the six-piece lens group of the optical imaging lens in Embodiment 4. For its basic parameters, please refer to Tables 3 to 4, which will not be elaborated here.

[0135] The difference between this embodiment and Embodiment 4 lies in that the structural dimensions of at least some components in the lens barrel and the spacer element group are different, as shown in Table 8.

[0136] Figure 9 (A2) in shows the astigmatism curves of the optical imaging lenses of Embodiments 4 to 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 9 (B2) in shows the longitudinal chromatic aberration curves of the optical imaging lenses of Embodiments 4 to 6, which represent the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figure 9 it can be known that the optical imaging lenses provided in Embodiments 4 to 6 can achieve good imaging quality.

[0137] Embodiment 7

[0138] Figure 10 FIG. shows a schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application. As Figure 10As shown in the figure, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and a spacer element group. The lens group sequentially includes, 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 diaphragm STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0139] The first lens E1 has a negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative focal power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive focal power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative focal power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has a positive focal power, its object side surface S11 is convex, and its image side surface S12 is concave.

[0140] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0141] Table 5 shows the basic parameter table of the lens group of the optical imaging lens of Embodiment 7, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0142] Table 5

[0143]

[0144] 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, and among them, each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1. Table 6 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of the aspherical surfaces S1 to S12 that can be used in Embodiment 7.

[0145] Table 6

[0146]

[0147] Embodiment 8

[0148] Figure 11 shows a schematic structural diagram of the optical imaging lens according to Embodiment 8 of the present application. As Figure 11As shown in the figure, the optical imaging lens includes a lens barrel, a lens group disposed within the lens barrel, and a spacer element group. The lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0149] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0150] The lens group of the optical imaging lens in this embodiment has the same structure as the lens group of the optical imaging lens in Embodiment 7. The basic parameters are shown in detail in Tables 5 to 6 and will not be elaborated here.

[0151] The difference between this embodiment and Embodiment 7 lies in that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different, as shown in Table 8.

[0152] Embodiment 9

[0153] Figure 12 The structural schematic diagram of the optical imaging lens according to Embodiment 9 of the present application is shown. As Figure 12 shown, the optical imaging lens includes a lens barrel, a six-piece lens group disposed within the lens barrel, and a spacer element group. The six-piece lens group sequentially includes, 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. An aperture STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0154] The spacer element group includes a first spacer element P1 disposed between the first lens and the second lens, a second spacer element P2 and a second auxiliary spacer element P2b disposed between the second lens and the third lens, a third spacer element P3 and a third spacer element P3b disposed between the third lens and the fourth lens, a fourth spacer element P4 disposed between the fourth lens and the fifth lens, a fifth spacer element P5 and a fifth auxiliary spacer element P5b disposed between the fifth lens and the sixth lens.

[0155] The lens group of the optical imaging lens in this embodiment has the same structure as the lens group of the optical imaging lens in Embodiment 7. The basic parameters are shown in detail in Tables 5 to 6 and will not be elaborated here.

[0156] The difference between this embodiment and Embodiment 7 lies in that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.

[0157] Figure 13 (A3) in shows the astigmatism curves of the optical imaging lenses of Embodiments 7 to 9, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 (B3) in shows the longitudinal chromatic aberration curves of the optical imaging lenses of Embodiments 7 to 9, which represent the deviations of different image heights of light rays on the imaging plane after passing through the lens. According to Figure 13 it can be seen that the optical imaging lenses provided in Embodiments 7 to 9 can achieve good imaging quality.

[0158] Table 7 gives the parameter values of FOV, f, f23, f34, and SAG51 for each of Embodiments 1 to 9. Among them, the unit of FOV in Table 7 is degree (°), and the units of f, f23, f34, and SAG51 are all millimeter (mm).

[0159] Table 7

[0160]

[0161] Table 8 gives the parameter values of at least some of the elements in the lens barrel and the spacer element group for each of Embodiments 1 to 9. Among them, some parameters can be measured according to the Figure 1 indicated marking method, and the units of the parameters listed in Table 8 are all millimeter (mm).

[0162] Table 8

[0163]

[0164] In summary, the optical imaging lenses in Embodiments 1 to 9 satisfy the relationships shown in Table 9.

[0165] Table 9

[0166]

[0167] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device 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.

[0168] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and 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 technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens group, sequentially including from the object side to the image side along the optical axis: a first lens with negative optical power, a second lens with negative 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 positive optical power; An interval element group, including a fourth interval element and a fifth interval element, the fourth interval element is disposed between the fourth lens and the fifth lens and at least partially contacts the image side surface of the fourth lens, and the fifth interval element is disposed between the fifth lens and the sixth lens and at least partially contacts the image side surface of the fifth lens; and A lens barrel, accommodating the lens group and the interval element group; The number of lenses with optical power in the optical imaging lens is six; The optical imaging lens satisfies: 2.77 < (D4m - d4m) / CT5 < 4.67 and 6.40 < EP45 / T45 < 10.26; Wherein, D4m is the outer diameter of the image side surface of the fourth interval element, d4m is the inner diameter of the image side surface of the fourth interval element, CT5 is the central thickness of the fifth lens on the optical axis, EP45 is the distance between the image side surface of the fourth interval element and the object side surface of the fifth interval element along the optical axis direction, and T45 is the interval distance between the fourth lens and the fifth lens on the optical axis.

2. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 1.44 < CT5 / T56 < 3.83 and 3.72 < (D5s - d5s) / T56 < 16.10, wherein T56 is the interval distance between the fifth lens and the sixth lens on the optical axis, D5s is the outer diameter of the object side surface of the fifth interval element, and d5s is the inner diameter of the object side surface of the fifth interval element.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 10.25 < T45 / CP4 < 22.94, wherein CP4 is the maximum thickness of the fourth interval element along the optical axis direction.

4. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 1.74 < D4s / f4 < 2.42 and 1.40 < (D4s - d4s) / CT4 < 2.07, wherein D4s is the outer diameter of the object side surface of the fourth interval element, d4s is the inner diameter of the object side surface of the fourth interval element, f4 is the effective focal length of the fourth lens, and CT4 is the central thickness of the fourth lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies: 2.40 < EP45 / (T45 + T56) < 4.41, wherein T56 is the interval distance between the fifth lens and the sixth lens on the optical axis.

6. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: -4.05 < SAG51 / (CP4 + T45) < -2.95, where SAG51 is the axial distance between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens, and CP4 is the maximum thickness of the fourth spacer element along the optical axis direction.

7. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 1.88 < CT4 / (CP4 + CT5) < 2.44, where CT4 is the central thickness of the fourth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis direction.

8. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 1.00 < d0m / d0s < 1.63, where d0m is the inner diameter of the image-side end face of the lens barrel, and d0s is the inner diameter of the object-side end face of the lens barrel.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a third spacer element, which 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: 1.20 < f34 / EP34 < 5.71, where f34 is the combined effective focal length of the third lens and the fourth lens, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction.

10. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a third spacer element, which 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: 1.00 mm < CT3 / N3 < 1.48 mm and 1.00 < f3 / d3s < 1.69, where CT3 is the central thickness of the third lens on the optical axis, N3 is the refractive index of the third lens, f3 is the effective focal length of the third lens, and d3s is the inner diameter of the object side surface of the third spacer element.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that: 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 is in contact with the image side surface of the second lens. 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: 1.19 < d3s / d2m < 1.74, where d3s is the inner diameter of the object side surface of the third spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

12. The optical imaging lens according to any one of claims 1 to 8, characterized in that: 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 is in contact with the image side surface of the second lens. 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: 2.31 < f23 / (CP2 + EP23) < 4.07, where f23 is the combined focal length of the second lens and the third lens, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction.

13. The optical imaging lens according to any one of claims 1 to 8, characterized in that: 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 contacts the image side of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side of the third lens. The optical imaging lens satisfies: 1.23 < CT3 / EP23 < 1.77, where CT3 is the central thickness of the third lens on the optical axis, and EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis direction.

14. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side of the first lens, and the second spacer element is disposed between the second lens and the third lens and contacts the image side of the second lens. The optical imaging lens satisfies: -3.03 < D1m / R3 < -1.57 and -1.34 < d2s / R4 < -0.73, where D1m is the outer diameter of the image side of the first spacer element, R3 is the curvature radius of the object side of the second lens, d2s is the inner diameter of the object side of the second spacer element, and R4 is the curvature radius of the image side of the second lens.

15. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a first spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side of the first lens. The optical imaging lens satisfies: 2.03 < T12 / (CT1 + CP1) < 2.77, where T12 is the spacing distance between the first lens and the second lens on the optical axis, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

16. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a first spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side of the first lens. The central thickness CT1 of the first lens on the optical axis is less than the central thickness CT2 of the second lens on the optical axis. The optical imaging lens satisfies: 2.19 < d1s / T12 < 3.04, where d1s is the inner diameter of the object side of the first spacer element, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

17. The optical imaging lens according to any one of claims 1-8, wherein The spacer element group further includes a third spacer element and a third auxiliary spacer element. The third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. The third auxiliary spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third spacer element; The optical imaging lens satisfies: 1.64 < (CP3 + CP3b) / T34 < 2.21, where CP3 is the maximum thickness of the third spacer element along the optical axis direction, CP3b is the maximum thickness of the third auxiliary spacer element along the optical axis direction, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis.

18. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The spacer element group further includes a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens; The optical imaging lens satisfies: 1.20 < EP12 / (CT2 - T23) < 3.95, where EP12 is the distance between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis direction, CT2 is the central thickness of the second lens on the optical axis, and T23 is the spacing distance between the second lens and the third lens on the optical axis.

Images