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 is composed of a first lens to a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and the axial distance between the first lens and the second lens is greater than the axial distance between any two adjacent lenses among the first lens to the sixth lens; the spacer element group includes a first spacer element; the optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

Description

Technical Field

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

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical imaging lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical imaging lenses varies.

[0003] Six-piece optical imaging lenses have become the mainstream and are widely used in fields such as mobile phones, VR headsets, smart watches, and smart glasses. Currently, in order to achieve the characteristic of a large field of view angle for an optical imaging lens, the first lens is usually set to have a negative optical power, and there is a large air gap between the first lens located in front of the system and the second lens. However, such a setting easily generates more stray light reflections in the region between the first lens and the second lens, affecting the imaging quality of the optical imaging lens. Summary of the Invention

[0004] One aspect of the present application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical powers arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any adjacent two lenses among the first lens to the sixth lens on the optical axis; the spacer element group includes a first spacer element, and the first spacer element is placed between the first lens and the second lens and contacts the image side surface of the first lens; the optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

[0005] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 3.05 < EP01 / CT1 < 4.15, where EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

[0006] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, where f is the total effective focal length of the optical imaging lens, L is the maximum distance along the optical axis from the object side end surface to the image side end surface of the lens barrel, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

[0007] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, where T12 is the distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, where 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 f5 is the effective focal length of the fifth lens.

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.65 < DT62 / Yc62 × (D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side surface of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis in the effective diameter of the image side surface of the sixth lens to the optical axis; D5m is the outer diameter of the image side surface of the fifth spacer element, and d5m is the inner diameter of the image side surface of the fifth spacer element.

[0011] According to an exemplary embodiment of the present application, 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; and the optical imaging lens satisfies: 0.25 mm < R3 / f2 × (d1m - d2s) < 0.50 mm, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0012] According to an exemplary embodiment of the present application, 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; and the optical imaging lens satisfies: 4.50 < (D2m - d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and EP23 is the spacing distance between the second spacer element and the third spacer element on the optical axis.

[0013] According to an exemplary embodiment of the present application, 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; and the optical imaging lens satisfies: -20.10 < f3 / (d3s - d2m) < -5.40, where d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens.

[0014] According to an exemplary embodiment of the present application, 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 contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: -10.95 < R8 / N4×(d4m / (2×DT42)) < -3.40, where R8 is the radius of curvature of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens.

[0015] According to an exemplary embodiment of the present application, 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 contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 1.50 < (D4s - d4s) / DT41 < 4.45, 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, and DT41 is the maximum effective radius of the object side surface of the fourth lens.

[0016] According to an exemplary embodiment of the present application, 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 contacts the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 6.65 < (D3m - d3m) / EP34 < 12.75, where D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the spacing distance between the third spacer element and the fourth spacer element on the optical axis.

[0017] According to an exemplary embodiment of the present application, the second lens, the fourth lens, and the fifth lens have positive optical powers, and the third lens and the sixth lens have negative optical powers.

[0018] Another aspect of the present application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power arranged in sequence from the object side to the image side along the optical axis; the spacer element group may include 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; and the optical imaging lens satisfies: 0.25 < R3 / f2 × (d1m - d2s) < 0.50, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

[0019] The optical imaging lens provided by the present application uses six lenses. The first lens has a negative optical power and satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40. The spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses among the first lens to the sixth lens on the optical axis. The above settings help to control the convergence of light rays with a large field of view, enabling the optical imaging lens to achieve the characteristic of a large field of view. However, a large spacing distance will be formed between the first lens and the second lens, and more stray light reflections are likely to occur in this area. Therefore, the present application provides a first spacer element between the first lens and the second lens, and by controlling the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens to satisfy 1.80 < R2 / (d1s - d1m) < 4.70, it can effectively improve the reflected stray light in this area, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality 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 following detailed description of non - restrictive embodiments with reference to the accompanying drawings. Among them:

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

[0022] Figure 2 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of the present application;

[0023] Figure 3 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 2 of the present application;

[0024] Figure 4 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 3 of the present application;

[0025] Figure 5 It shows the axial chromatic aberration curve (A1), astigmatism curve (B1), distortion curve (C1), and lateral chromatic aberration curve (D1) of the optical imaging lenses according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application;

[0026] Figure 6 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 4 of the present application;

[0027] Figure 7 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 5 of the present application;

[0028] Figure 8 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 6 of the present application;

[0029] Figure 9 It shows the axial chromatic aberration curve (A2), astigmatism curve (B2), distortion curve (C2), and lateral chromatic aberration curve (D2) of the optical imaging lenses according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application;

[0030] Figure 10 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 7 of the present application;

[0031] Figure 11 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 8 of the present application;

[0032] Figure 12 It shows a schematic diagram of the structure of the optical imaging lens according to Embodiment 9 of the present application;

[0033] Figure 13Shows the axial chromatic aberration curve (A3), astigmatism curve (B3), distortion curve (C3), and lateral chromatic aberration curve (D3) of the optical imaging lens according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application;

[0034] Figure 14 Shows the ray diagram of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 3.56;

[0035] Figure 15 Shows the spot diagram on the imaging plane of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 3.56;

[0036] Figure 16 Shows the ray diagram of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 1.6;

[0037] Figure 17 Shows the spot diagram on the imaging plane of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 1.6;

[0038] Figure 18 Shows the ray diagram of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 5.0;

[0039] Figure 19 Shows the spot diagram on the imaging plane of the optical imaging lens of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 5.0. Detailed Description of the Specific Embodiment

[0040] To better understand the present application, more detailed descriptions will be made for various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the 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.

[0041] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. 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.

[0042] In the accompanying drawings, for the sake of clarity, the thickness, dimensions, and shape of the lens are slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is to say, the spherical or aspherical shapes are not limited to those shown in the drawings. The drawings are provided only by way of example and are not drawn to an exact scale.

[0043] In this document, the paraxial region refers to the region 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 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 surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens. The judgment of the surface profile in the paraxial region can be made according to the general methods in the art. For example, the concavity and convexity can be judged by the sign of the R value (R refers to the radius of curvature in the paraxial region). Taking the object side surface as an example, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; taking the image side surface as an example, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0044] It should also be understood that the terms "comprising" and / or "having", when used in this specification, denote the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when describing the embodiments of the present application, the use of "may" indicates "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 used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0046] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent 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 groups, lens barrels, and spacer element groups in the embodiments of the present application can be combined arbitrarily, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel and spacer element group of this embodiment.

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

[0048] 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, d0m is the inner diameter of the image-side end face of the lens barrel, d1s is the inner diameter of the object-side face of the first spacer element, d1m is the inner diameter of the image-side face of the first spacer element, D2m is the outer diameter of the image-side face of the second spacer element, d2m is the inner diameter of the image-side face of the second spacer element, d2s is the inner diameter of the object-side face of the second spacer element, d3s is the inner diameter of the object-side face of the third spacer element, D3m is the outer diameter of the image-side face of the third spacer element, d3m is the inner diameter of the image-side face of the third spacer element, D4s is the outer diameter of the object-side face of the fourth spacer element, D4m is the outer diameter of the image-side face of the fourth spacer element, d4m is the inner diameter of the image-side face of the fourth spacer element, d4s is the inner diameter of the object-side face of the fourth spacer element, d5m is the inner diameter of the image-side face of the fifth spacer element, D5m is the outer diameter of the image-side face of the fifth spacer element, EP01 is the axial spacing distance between the object-side end face of the lens barrel and the object-side face of the first spacer element on the optical axis, EP23 is the axial spacing distance between the second spacer element and the third spacer element on the optical axis, EP34 is the axial spacing distance between the third spacer element and the fourth spacer element on the optical axis, DT41 is the maximum effective radius of the object-side face of the fourth lens, DT42 is the maximum effective radius of the image-side face of the fourth lens, DT62 is the maximum effective radius of the image-side face of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis to the optical axis among the effective diameters of the image-side face of the sixth lens, SAG61 is the axial distance between the intersection of the object-side face of the sixth lens and the optical axis and the vertex of the effective radius of the object-side face of the sixth lens, CP1 is the maximum thickness of the first spacer element along the optical axis direction, and L is the maximum distance along the optical axis from the object-side end face of the lens barrel to the image-side end face.

[0049] Refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 10 、 Figure 11 and Figure 12, a first aspect of the present application provides an optical imaging lens, which may include a six-lens group. The six-lens group 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 one object side facing the object and one image side facing the imaging surface. Among the first lens to the sixth lens, there may be a spacing distance between any two adjacent lenses, and this spacing distance may be an air gap.

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

[0051] In an exemplary embodiment, the optical imaging lens further includes a spacer element group, which may include at least one spacer element. 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. Reasonable use of spacer elements helps the optical imaging lens intercept redundant refraction and reflection optical paths, reduce the generation of stray light and ghost images, and improve the imaging quality of the optical imaging lens.

[0052] In an exemplary embodiment, the optical imaging lens further includes a lens barrel. The lens group and the spacer element group are placed inside the lens barrel. The lens barrel includes an object-side end face, an image-side end face, an outer ring face, and an inner ring face. Among them, the end face closest to the object side of the lens barrel is the object-side end face of the lens barrel, and the end face closest to the image side of the lens barrel is the image-side end face of the lens barrel; in the direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer ring face, and the surface of the lens barrel closest to the optical axis is the inner ring face. In some embodiments, the inner ring face may be stepped. For example, the inner diameter of the inner ring face gradually decreases step by step from the image-side end face to the object-side end face. Correspondingly, the outer diameter of the outer ring face shows a decreasing trend from the image-side end face to the object-side end face.

[0053] In an exemplary embodiment, the optical imaging lens may further include a diaphragm for restricting the light beam. It should be noted that the diaphragm can be set at any position between or on one side of any lenses according to actual needs. For example, the diaphragm is located between the second lens and the third lens.

[0054] 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, 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. The first lens has a negative optical power, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any adjacent two lenses among the first lens to the sixth lens on the optical axis. The optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40. The above settings help to control the convergence of light rays with a large field of view, ensuring that the lens achieves good large-field characteristics. However, while ensuring the large-field characteristics, a relatively large spacing distance is formed between the first lens and the second lens, and in this area, there is a tendency to generate more stray light reflections, seriously affecting the imaging clarity.

[0055] In an exemplary embodiment, the spacer element group may include a first spacer element, which is disposed between the first lens and the second lens and at least partially contacts the image side surface of the first lens. The optical imaging lens may satisfy: 1.80 < R2 / (d1s - d1m) < 4.70. By controlling the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens within appropriate ranges, it is possible to effectively improve the reflected stray light between the first lens and the second lens, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality of the optical imaging lens.

[0056] The optical imaging lens provided by the present application uses six lenses. The first lens has a negative optical power and satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40. The spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any adjacent two lenses among the first lens to the sixth lens on the optical axis. The above settings help to control the convergence of light rays with a large field of view, enabling the optical imaging lens to achieve the characteristics of a large field of view. However, a relatively large spacing distance will be formed between the first lens and the second lens, and in this area, there is a tendency to generate more stray light reflections. Therefore, the present application provides a first spacer element between the first lens and the second lens, and by controlling R2 / (d1s - d1m) within an appropriate range, it is possible to control the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens, and further improve the reflected stray light in this area, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality.

[0057] The following combination with Figures 14 to 19, it is further illustrated that when the optical imaging lens of the present application satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70, the reflected stray light between the first lens and the second lens can be effectively improved, ensuring good imaging clarity.

[0058] Figure 14 and Figure 15 respectively show the ray diagram and the spot diagram on the imaging plane of the optical imaging lens 1 of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 3.56; Figure 16 and Figure 17 respectively show the ray diagram and the spot diagram on the imaging plane of the optical imaging lens 2 of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 1.6; Figure 18 and Figure 19 respectively show the ray diagram and the spot diagram on the imaging plane of the optical imaging lens 3 of the present application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 5.0. It should be noted that the first lenses of the optical imaging lens 1, the optical imaging lens 2, and the optical imaging lens 3 all have negative optical power, the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses among the first lens to the sixth lens on the optical axis, and all satisfy (R1 + R2) / (R1 - R2) = 1.12. The difference between the optical imaging lens 1, the optical imaging lens 2, and the optical imaging lens 3 lies in the different values of R2 / (d1s - d1m).

[0059] When the optical imaging lens 1, the optical imaging lens 2, and the optical imaging lens 3 satisfy (R1 + R2) / (R1 - R2) = 1.12, it helps to control the convergence of light rays with a large field of view, but a large spacing distance will be formed between the first lens and the second lens, and more stray light reflections are likely to occur in this area. Figure 14 The optical imaging lens 1 of... can reasonably control the inner diameter of the image side, the inner diameter of the object side, and the curvature radius of the first lens by controlling R2 / (d1s - d1m) within the range defined in the present application, so that the stray light rays are intercepted by the first spacer element and cannot propagate to the imaging plane, and the light rays within the effective diameter position will not form internal reflection stray light at the inner diameter edge position of the object side of the first spacer element. Furthermore, the reflected stray light in this area can be improved, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality. As can be seen from Figure 15 that the spot energy of the stray light on the imaging plane is relatively low.

[0060] Figure 16For the optical imaging lens 2, R2 / (d1s - d1m) is less than the range defined in this application, and the difference between d1s and d1m is too large. More specifically, d1s is too large, and the first spacer element cannot play the role of intercepting stray light rays. The light rays at non-effective diameters are easily reflected onto the inner diameter surface of the first spacer, resulting in a strong stray light risk and affecting the imaging quality of the optical imaging lens. As can be seen from Figure 17 that the spot energy of the stray light on the imaging surface is relatively high.

[0061] Figure 18 For the optical imaging lens 3, R2 / (d1s - d1m) is greater than the range defined in this application, and the difference between d1s and d1m is too small. More specifically, d1s is too small and is close to d1m. The light rays within the effective diameter position of the first lens are likely to form internal reflection stray light at the inner diameter edge position of the object side surface of the first spacer element, affecting the imaging quality of the optical imaging lens. As can be seen from Figure 19 that the spot energy of the stray light on the imaging surface is very high.

[0062] In an exemplary embodiment, the spacer element group may include 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: 3.05 < EP01 / CT1 < 4.15, where EP01 is the spacing distance between the object side end face of the lens barrel and the object side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis. By controlling the above conditions, it is beneficial to reasonably control the thickness of the front end portion of the lens barrel facing the object side and the edge thickness of the first lens, ensuring the thickness uniformity of the front end portion of the lens barrel and the other parts of the lens barrel as a whole, which is conducive to the molding of the lens barrel; and by reasonably controlling the edge thickness and the central thickness of the first lens, it is beneficial to ensure the molding of the first lens.

[0063] In an exemplary embodiment, the optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, where f is the total effective focal length of the optical imaging lens, L is the maximum distance along the optical axis from the object side end face to the image side end face of the lens barrel, and T12 is the spacing distance between the first lens and the second lens on the optical axis. By controlling the above conditions, the maximum value of the spacing distance between any two adjacent lenses in the lens group on the optical axis and the total length of the lens can be restricted, which is beneficial to controlling the maximum value of the spacing distance between any two adjacent lenses in the lens group on the optical axis and preventing the spacing distance from being too large. During the baking process of the lens, the air in the spacing distance expands due to heat, causing the lens to float and affecting the performance of the lens.

[0064] In an exemplary embodiment, the optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, where T12 is the spacing distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element in the optical axis direction. By controlling the above conditions, the ratio of the spacing distance between the first lens and the second lens on the optical axis to the maximum thickness of the first spacer element in the optical axis direction can be restricted, which is beneficial to minimizing the mechanical sensitivity of the lens to the axial force and reducing the optical sensitivity of the lens to the lowest level.

[0065] In an exemplary embodiment, the spacer element group may include a fifth spacer element, which is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; and the optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, where 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 f5 is the effective focal length of the fifth lens. By controlling the above conditions, it is beneficial to restrict the outer diameter difference between each lens within a certain range, which is beneficial to the stability during the lens assembly process, ensuring the assembly yield of the lens. At the same time, restricting the inner diameter of the image side end surface of the lens barrel ensures the assembly bearing stability of the lens, preventing large bearing misalignment; and restricting the effective focal length of the fifth lens is beneficial to ensuring the convergence of light rays after passing through the fifth lens.

[0066] In an exemplary embodiment, the spacer element group may include a fifth spacer element, which is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens. By controlling the above conditions, it is beneficial to ensure the curvature of the object side surface of the sixth lens, preventing problems such as the forming die of the lens being unable to be processed due to an excessive angle between the effective diameter part of the lens and the flange surface connection part. At the same time, restricting the inner diameter of the image side surface of the fifth spacer element is beneficial to improving the stray light phenomenon of the light rays emerging from the lens.

[0067] In an exemplary embodiment, the spacer element group may include a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens; and the optical imaging lens satisfies: 4.65 < DT62 / Yc62×(D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis to the optical axis among the effective diameters of the image side of the sixth lens; D5m is the outer diameter of the image side of the fifth spacer element, and d5m is the inner diameter of the image side of the fifth spacer element. In the actual processing of the sixth lens, the problem of welding marks is likely to occur. By controlling the above conditions, the shape of the sixth lens is improved, which is beneficial to ensuring the processing feasibility of the sixth lens. At the same time, by restricting the inner and outer diameters of the image side of the fifth spacer element, it is beneficial to improving the stray light phenomenon of the light emitted from the lens.

[0068] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and in contact with the image side of the first lens, and the second spacer element is disposed between the second lens and the third lens and in contact with the image side of the second lens; and the optical imaging lens satisfies: 0.25 < R3 / f2×(d1m - d2s) < 0.50, where R3 is the curvature radius of the object side of the second lens, f2 is the effective focal length of the second lens, d2s is the inner diameter of the object side of the second spacer element, and d1m is the inner diameter of the image side of the first spacer element. By controlling the above conditions, the surface shape of the object side of the second lens can be ensured to remain stable before and after the reliability test, reducing the influence of the surface shape on the optical performance of the lens; in addition, by controlling the inner diameter of the image side of the first spacer element and the inner diameter of the object side of the second spacer element, it is beneficial to improving the stray light phenomenon at the flange position of the second lens.

[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 disposed between the second lens and the third lens and in contact with the image side 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 of the third lens; and the optical imaging lens satisfies: 4.50 < (D2m - d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side of the second spacer element, d2m is the inner diameter of the image side of the second spacer element, and EP23 is the spacing distance between the second spacer element and the third spacer element on the optical axis. By controlling the above conditions, it is beneficial for the second spacer element to block the stray light reflected by the first lens and the second lens from entering the rear lens group, improving the stray light quality of the lens, and by restricting the edge thickness of the third lens, it is beneficial to ensuring the forming feasibility of the third lens.

[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 disposed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens; and the optical imaging lens satisfies: -20.10 < f3 / (d3s - d2m) < -5.40, where d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens. By controlling the above conditions, it is beneficial to ensure the improvement effect of stray light passing through the flange position of the third lens, ensure the imaging quality of the lens, and by limiting the effective focal length of the third lens, it is beneficial to ensure the accurate transmission of light.

[0071] In an exemplary embodiment, 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 contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: -10.95 < R8 / N4×(d4m / (2×DT42)) < -3.40, where R8 is the curvature radius of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens. By restricting the refractive index of the fourth lens and the curvature of the image side surface, it is beneficial to improve the ghost image generated by the effective diameter reflection passing through the image side surface of the fourth lens, reduce the energy intensity threshold of the lens ghost image to the lowest level, and ensure the imaging quality of the lens.

[0072] In an exemplary embodiment, 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 contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 1.50 < (D4s - d4s) / DT41 < 4.45, 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, and DT41 is the maximum effective radius of the object side surface of the fourth lens. By controlling the above conditions, the bearing space of the image side surface of the fourth lens is ensured, the stability of the assembly during the assembly of the fifth lens and the sixth lens is ensured, and at the same time, by restricting the maximum effective radius (i.e., the light passing aperture) of the object side surface of the fourth lens, it is beneficial to ensure the accurate transmission of light.

[0073] In an exemplary embodiment, 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 contacts the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens. And the optical imaging lens satisfies: 6.65 < (D3m - d3m) / EP34 < 12.75, where D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the spacing distance between the third spacer element and the fourth spacer element on the optical axis. By controlling the above conditions, the inner and outer diameters of the image side surface of the third spacer element and the edge thickness of the fourth lens are restricted, which is beneficial to reducing the internal reflection stray light in the fourth lens and improving the stray light quality of the lens.

[0074] 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.

[0075] 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.

[0076] It should be understood that the present application focuses on optimizing the performance of a six-piece lens. Specifically, the present application focuses on how to overcome problems such as a large spacing distance is formed between the first lens with a negative optical power and the second lens, and more stray light reflections are likely to occur in this area, or problems such as poor assembly stability due to excessive step difference between the lens and the supporting member, and how to improve the stray light problem at the flange position of the second lens. The specific optical power distribution of the six lenses and the surface type settings 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 type settings are shown for the lens group in the embodiments of the present application, it should be understood that these embodiments are only exemplary, and the lens group in the present application should not be limited to the several specific situations shown in the embodiments.

[0077] The optical imaging lens according to the above embodiments of the present application may employ multiple lenses, such as the six lenses described above. However, those skilled in the art should understand that without departing from the technical solutions 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. For example, although six lenses are described as an example in the embodiments, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0078] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0079] Embodiment 1

[0080] Figure 2 A schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application is shown. As Figure 2 shown, the optical imaging lens includes a lens barrel, a six-lens group disposed within the lens barrel, and a spacer element group. The six-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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3.

[0081] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has a negative optical power, its object side surface S5 is convex, and its image side surface S6 is concave. 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 positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is concave, and its image side surface S12 is concave.

[0082] 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, and a fifth spacer element P5.

[0083] The first spacer element P1 is disposed 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 disposed 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 disposed 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 disposed 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 disposed 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.

[0084] In the example, light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA (not shown).

[0085] Table 1 shows the basic parameter table of the lens group of the optical imaging lens according to Embodiment 1, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0086] Table 1

[0087]

[0088] 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 the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0089] (1);

[0090] Wherein, x is the distance sagitta from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, 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 high-order term coefficients A4, A6, A8, A10, A12, A14, A16 for the aspherical surfaces S1 to S12 in Embodiment 1.

[0091] Table 2

[0092]

[0093] Embodiment 2

[0094] Figure 3 shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application. As Figure 3As 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, along the optical axis from the object side to the image side: 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0095] 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 1. The basic parameters are shown in Tables 1 to 2 and will not be elaborated here.

[0096] The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different.

[0097] Embodiment 3

[0098] Figure 4 shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application. As Figure 4 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, along the optical axis from the object side to the image side: 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0099] 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 1. The basic parameters are shown in Tables 1 to 2 and will not be elaborated here.

[0100] The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different.

[0101] Figure 5 In (A1) shows the axial chromatic aberration curve of the optical imaging lenses of Embodiments 1 to 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 5 In (B1) shows the astigmatism curve of the optical imaging lenses of Embodiments 1 to 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 In (C1) shows the distortion curve of the optical imaging lenses of Embodiments 1 to 3, which represents the distortion magnitude values corresponding to different field angles. Figure 5Among them, (D1) shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 to Embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 5 it can be known that the optical imaging lenses given in Embodiment 1 to Embodiment 3 can achieve good imaging quality.

[0102] Embodiment 4

[0103] 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 six-piece lens group disposed in 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3.

[0104] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S11 is concave, and its image side S12 is concave.

[0105] 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, and a fifth spacer element P5.

[0106] The first spacer element P1 is disposed between the first lens E1 and the second lens E2, and the object side of the first spacer element P1 is at least partially in contact with the image side S2 of the first lens E1. The second spacer element P2 is disposed between the second lens E2 and the third lens E3, and the object side of the second spacer element P2 is at least partially in contact with the image side S4 of the second lens E2. The third spacer element P3 is disposed between the third lens E3 and the fourth lens E4, and the object side of the third spacer element P3 is at least partially in contact with the image side S6 of the third lens E3. The fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5, and the object side of the fourth spacer element P4 is at least partially in contact with the image side S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object side of the fifth spacer element P5 is at least partially in contact with the image side S10 of the fifth lens E5.

[0107] In the example, light from an object sequentially passes through surfaces S1 to S12 and finally forms an image on an imaging surface IMA (not shown).

[0108] 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 and the thickness / distance are both millimeters (mm).

[0109] Table 3

[0110]

[0111] In this embodiment, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the aspherical formula (1) in Embodiment 1. Table 4 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces S1 to S12 that can be used in Embodiment 4.

[0112] Table 4

[0113]

[0114] Embodiment 5

[0115] Figure 7 shows a schematic structural diagram of the optical imaging lens of Embodiment 5 of the present application. As Figure 7 shown, the optical imaging lens includes a lens barrel, a six-piece lens group disposed in 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0116] 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, and its basic parameters are shown in Tables 3 to 4, which will not be elaborated here.

[0117] The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different.

[0118] Embodiment 6

[0119] Figure 8 shows a schematic structural diagram of the optical imaging lens of Embodiment 6 of the present application. As Figure 8As 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 located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0120] 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. The basic parameters are shown in Tables 3 to 4 and will not be elaborated here.

[0121] The difference between this embodiment and Embodiment 4 lies in that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different.

[0122] Figure 9 (A2) in shows the axial chromatic aberration curve of the optical imaging lenses of Embodiments 4 to 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 9 (B2) in shows the astigmatism curve of the optical imaging lenses of Embodiments 4 to 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 9 (C2) in shows the distortion curve of the optical imaging lenses of Embodiments 4 to 6, which represents the distortion magnitude values corresponding to different field angles. Figure 9 (D2) in shows the lateral chromatic aberration curve of the optical imaging lenses of Embodiments 4 to 6, which represents 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 seen that the optical imaging lenses given in Embodiments 4 to 6 can achieve good imaging quality.

[0123] Embodiment 7

[0124] Figure 10 shows a schematic structural diagram of the optical imaging lens according to Embodiment 7 of the present application. As Figure 10 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 located between the second lens E2 and the third lens E3.

[0125] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S11 is concave, and its image side S12 is concave.

[0126] 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, and a fifth spacer element P5.

[0127] The first spacer element P1 is disposed between the first lens E1 and the second lens E2, and the object side of the first spacer element P1 is at least partially in contact with the image side S2 of the first lens E1. The second spacer element P2 is disposed between the second lens E2 and the third lens E3, and the object side of the second spacer element P2 is at least partially in contact with the image side S4 of the second lens E2. The third spacer element P3 is disposed between the third lens E3 and the fourth lens E4, and the object side of the third spacer element P3 is at least partially in contact with the image side S6 of the third lens E3. The fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5, and the object side of the fourth spacer element P4 is at least partially in contact with the image side S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object side of the fifth spacer element P5 is at least partially in contact with the image side S10 of the fifth lens E5.

[0128] In the example, light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA (not shown).

[0129] Table 5 shows the basic parameter table of the lens group of the optical imaging lens of Embodiment 7, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0130] Table 5

[0131]

[0132] 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 the surface profiles of the aspherical lenses can be defined by, but not limited to, the aspherical formula (1) in Embodiment 1. Table 6 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces S1 to S12 that can be used in Embodiment 7.

[0133] Table 6

[0134]

[0135] Embodiment 8

[0136] Figure 11 shows a schematic structural diagram of the optical imaging lens according to Embodiment 8 of the present application. As Figure 11 shown, the optical imaging lens includes a lens barrel, a six-piece lens group disposed in 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0137] 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 7. The basic parameters are shown in Tables 5 to 6 and will not be elaborated here.

[0138] 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.

[0139] Embodiment 9

[0140] Figure 12 shows a schematic structural diagram of the optical imaging lens according to Embodiment 9 of the present application. As Figure 12 shown, the optical imaging lens includes a lens barrel, a six-piece lens group disposed in 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. The aperture stop STO (not shown) is located between the second lens E2 and the third lens E3. 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, and a fifth spacer element P5.

[0141] 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 7. The basic parameters are shown in Tables 5 to 6 and will not be elaborated here.

[0142] 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.

[0143] Figure 13Among them, (A3) shows the axial chromatic aberration curve of the optical imaging lens of Embodiments 7 to 9, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 13 Among them, (B3) shows the astigmatism curve of the optical imaging lens of Embodiments 7 to 9, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 Among them, (C3) shows the distortion curve of the optical imaging lens of Embodiments 7 to 9, which represents the distortion magnitude values corresponding to different field angles. Figure 13 Among them, (D3) shows the lateral chromatic aberration curve of the optical imaging lens of Embodiments 7 to 9, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figure 13 it can be known that the optical imaging lenses given in Embodiments 7 to 9 can achieve good imaging quality.

[0144] Table 7 gives the values of the parameters f, f1, f2, f3, f4, f5, f6, SAG61, DT41, DT42, DT62, and Yc62 of each of Embodiments 1 to 9. Among them, the units of the parameters listed in Table 7 are all millimeters (mm).

[0145] Table 7

[0146]

[0147] Table 8 gives the values of the parameters of at least some of the elements in the lens barrel and the spacer element group of each of Embodiments 1 to 9. Among them, the parameters listed in Table 8 can be measured according to the Figure 1 annotation method shown, and the units of the parameters listed in Table 8 are all millimeters (mm).

[0148] Table 8

[0149]

[0150] In summary, the optical imaging lenses of Embodiments 1 to 9 satisfy the relationships shown in Table 9.

[0151] Table 9

[0152]

[0153] This 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 smart watch or smart glasses, an independent imaging device such as a ranging camera, an independent imaging device such as a vehicle-mounted camera, a mobile electronic device such as a mobile phone or a tablet computer, an imaging module integrated on a ranging device, or an imaging module integrated on an assisted driving system, etc.

[0154] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. 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 the 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 technical solution formed by mutually replacing the above features with technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens group, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens with optical power arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses among the first lens to the sixth lens on the optical axis; A spacer element group, including a first spacer element, a second spacer element and a third spacer element. The first spacer element is placed between the first lens and the second lens and contacts the image side surface of the first lens. The second spacer element is placed between the second lens and the third lens and contacts the image side surface of the second lens. 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 A lens barrel, which houses the lens group and the spacer element group; The optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40, 1.80 < R2 / (d1s - d1m) < 4.70 and -20.10 < f3 / (d3s - d2m) < -5.40; Wherein, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, d1m is the inner diameter of the image side surface of the first spacer element, d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 3.05 < EP01 / CT1 < 4.15, wherein EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, wherein f is the total effective focal length of the optical imaging lens, L is the maximum distance from the object side end surface to the image side end surface of the lens barrel along the optical axis direction, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

4. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, wherein T12 is the spacing distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

5. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, and the fifth spacer element is placed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; and The optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, wherein 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 f5 is the effective focal length of the fifth lens.

6. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and The optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

7. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and The optical imaging lens satisfies: 4.65 < DT62 / Yc62×(D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side surface of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis among the effective diameters of the image side surface of the sixth lens to the optical axis; D5m is the outer diameter of the image side surface of the fifth spacer element, and d5m is the inner diameter of the image side surface of the fifth spacer element.

8. The optical imaging lens according to any one of claims 1-4, wherein The optical imaging lens satisfies: 0.25mm < R3 / f2×(d1m-d2s) < 0.50mm, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

9. The optical imaging lens according to any one of claims 1-4, wherein The optical imaging lens satisfies: 4.50 < (D2m-d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and EP23 is the axial spacing distance between the second spacer element and the third spacer element.

10. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: -10.95 < R8 / N4×(d4m / (2×DT42)) < -3.40, where R8 is the curvature radius of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens.

11. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: 1.50 < (D4s-d4s) / DT41 < 4.45, 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, and DT41 is the maximum effective radius of the object side surface of the fourth lens.

12. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element, the fourth spacer element being disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: 6.65<(D3m-d3m) / EP34<12.75, wherein D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the spacing distance between the third spacer element and the fourth spacer element on the optical axis.

13. The optical imaging lens according to any one of claims 1 to 4, wherein: The second lens, the fourth lens and the fifth lens have positive refractive power, and the third lens and the sixth lens have negative refractive power.

Images