Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing assembly, and the lens group is composed of six lenses. The six lenses are sequentially a first lens with negative focal power, a second lens with focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from the object side to the image side along the optical axis of the optical imaging lens; the following conditions are satisfied: 4.20 lt; l / (T45 + T56) lt; 4.95 DEG C, 4.95 DEG C; the following conditions are satisfied: 1.15 lt; f5 / d5slt; 1.65, 1.65; the following conditions are satisfied: 7.00 lt; (D5s-d4s) / EP45lt; and 11.90, 11.90. The optical imaging lens solves the problems that in the prior art, an air gap between adjacent lenses located at the image side end of a six-piece type optical imaging lens is large, the light ray progress is prone to being affected, and then the out-of-focus curve of a modulation transfer function deviates and the peak value is reduced.

Description

Technical Field

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

[0002] With the continuous development of smartphones, users' demands for mobile phone photography functions are becoming increasingly demanding, posing new challenges to the design of optical imaging lenses used in mobile phones. Currently, six-element optical imaging lenses are widely used in various portable electronic devices such as mobile phones, tablets, and wearable devices due to their compact structure, reasonable cost, and excellent imaging performance.

[0003] However, the existing six-element optical imaging lens faces a key technical challenge: when the air gap between adjacent lenses located on the image side is large, it will cause additional scattering and refraction loss of light when passing through the lenses on the image side, affecting the stability of light process and transmission, and further causing the modulation transfer function defocus curve to exhibit field curvature shift and peak drop, thereby significantly reducing the overall image clarity and contrast.

[0004] That is to say, the six-element optical imaging lens in the prior art has a large air gap between adjacent lenses located on the image side, which easily affects the process of light, thereby causing the modulation transfer function defocus curve to have field curvature offset and peak drop problems. Summary of the Invention

[0005] The primary objective of the present invention is to provide an optical imaging lens that addresses the problem of existing six-element optical imaging lenses, where large air gaps exist between adjacent lenses on the image side, which can easily affect the progression of light and lead to field curvature shift and peak drop in the modulation transfer function defocus curve.

[0006] To achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer assembly disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. Among them, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the spacer assembly includes a fourth spacer disposed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; the number of spacers between the fourth lens and the fifth lens is one or more, and the number of spacers between the fifth lens and the sixth lens is one or more; the maximum axial height L of the lens barrel, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.20 < L / (T45 + T56) < 4.95; the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 1.15 < f5 / d5s < 1.65; the spacer distance EP45 on the optical axis from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 7.00 < (D5s - d4s) / EP45 < 11.90.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer assembly disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. Among them, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the spacer assembly includes a fourth spacer disposed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; the number of spacers between the fourth lens and the fifth lens is one or more, and the number of spacers between the fifth lens and the sixth lens is one or more; the maximum axial height L of the lens barrel, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.20 < L / (T45 + T56) < 4.95; the effective focal length f5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth lens, and the inner diameter d4mn of the image side surface of the spacer closest to the image side between the fourth lens and the fifth lens satisfy: 3.65 < f5 / (d5s - d4mn) < 8.10; the spacer distance EP45 on the optical axis from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 7.00 < (D5s - d4s) / EP45 < 11.90.

[0008] Further, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex.

[0009] Further, the spacer assembly further includes a first spacer disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens. The effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -6.80 < f1 / d1s < -4.45; the effective focal length f6 of the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -2.75 < f6 / d5s < -2.25.

[0010] Furthermore, the spacer assembly further includes a first spacer disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens. The relationship between the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfies: 3.85 < f1 / R1 < 5.05; the relationship between the central thickness CT1 of the first lens on the optical axis and the spacer distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer satisfies: 2.10 < EP01 / CT1 < 3.20.

[0011] Furthermore, the relationship between the inner diameter d5mn of the image side surface of the spacer closest to the image side between the fifth lens and the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfies: 1.25 < d5mn / d5s < 1.40.

[0012] Furthermore, the relationship between the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R11 of the object side surface of the sixth lens satisfies: 9.40 < (R10 - R11) / (R10 + R11) < 22.35.

[0013] Furthermore, the spacer assembly further includes a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens. The spacer distance EP34 on the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer, the maximum axial thickness CP4 of the fourth spacer, and the air gap T45 on the optical axis between the fourth lens and the fifth lens satisfy: 0.90 < (EP34 + CP4) / T45 < 1.60.

[0014] Furthermore, the relationship between the sum ∑CP5 of the maximum axial thicknesses of all the spacers between the fifth lens and the sixth lens and the air gap T56 on the optical axis between the fifth lens and the sixth lens satisfies: 0.75 < ∑CP5 / T56 < 1.45.

[0015] Furthermore, the spacer assembly further includes a first spacer disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens, a second spacer disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens. The relationship between the inner diameter d1m of the image side surface of the first spacer and the inner diameter d2s of the object side surface of the second spacer satisfies: 1.30 < d1m / d2s < 1.55; the relationship between the inner diameter d3s of the object side surface of the third spacer and the inner diameter d2m of the image side surface of the second spacer satisfies: 1.20 < d3s / d2m < 1.70.

[0016] Furthermore, the spacer assembly further includes a second spacer disposed between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer 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 spacing distance EP23 on the optical axis from the image side surface of the second spacer to the object side surface of the third spacer, the maximum axial thickness CP3 of the third spacer, and the center thickness CT3 of the third lens on the optical axis satisfy the following conditions: 0.85<(EP23+CP3) / CT3<1.30; the air gap T23 on the optical axis between the second lens and the third lens and the maximum axial thickness CP2 of the second spacer satisfy the following conditions: 18.40 <T23 / CP2<27.95。

[0017] Furthermore, the curvature radius R10 of the image-side surface of the fifth lens, the curvature radius R11 of the object-side surface of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy the following relationship: -0.65<(R10+R11) / T56<-0.20; and the maximum value D5mx of the outer diameters of the image-side surfaces of all spacers between the fifth lens and the sixth lens and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following relationship: 2.50 <D5mx / d4s<3.05。

[0018] Furthermore, the sum of the center thicknesses ∑CT of the first to sixth lenses on the optical axis, the sum of the air gaps ∑AT between two adjacent lenses among the first to sixth lenses on the optical axis, and half the maximum field of view (Semi-FOV) of the optical imaging lens satisfy the following relationship: 0.90≤∑CT / ∑AT / Tan(Semi-FOV)≤1.15.

[0019] Furthermore, the effective focal length f of the optical imaging lens, the maximum axial height L of the lens barrel, and the distance TD from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis satisfy the following conditions: 4.90 <f / (L-TD)<6.90。

[0020] Furthermore, the effective focal length f5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth lens, and the inner diameter d4mn of the image side surface of the spacer closest to the image side between the fourth lens and the fifth lens satisfy the following relationship: 3.65 <f5 / (d5s-d4mn)<8.10。

[0021] Applying the technical solution of the present invention, the optical imaging lens of the present application is configured such that the first lens has a negative focal power, the second lens has a focal power, the third lens has a positive focal power, the fourth lens has a negative focal power, the fifth lens has a positive focal power, and the sixth lens has a negative focal power. The object side surface of the first lens is concave, and the image side surface of the first lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. At the same time, 4.20 < L / (T45 + T56) < 4.95 is satisfied. It can be seen that the air gap between the fourth lens and the fifth lens on the optical axis and the air gap between the fifth lens and the sixth lens on the optical axis account for a relatively large proportion of the maximum axial height of the lens barrel. When the air gaps between adjacent two lenses among the fourth lens, the fifth lens, and the sixth lens are relatively large, it will cause additional scattering and refraction losses when light passes through these lenses, and affect the light path, thereby affecting the field curvature of the outer field of view and causing the modulation transfer function defocus curve to have field curvature shift and peak drop. Therefore, by constraining 1.15 < f5 / d5s < 1.65 and 7.00 < (D5s - d4s) / EP45 < 11.90, the present application can constrain the refraction angle of light after passing through the fifth lens, avoid the situation of field curvature variation caused by too large light incident angle, and at the same time can control the edge thickness of the fifth lens and the variation gap of the outer diameter of the fifth spacer to ensure uniform propagation of light, reduce the occlusion and reflection of light between the fifth lens, the fourth spacer, and the fifth spacer, thereby reducing the degree of field curvature shift of the outer field of view and being beneficial to ensuring that the peak is at a relatively high level, thus improving the imaging performance of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 The size marking schematic diagram of the optical imaging lens of an optional embodiment of the present invention is shown;

[0024] Figure 2 The structural schematic diagram of the optical imaging lens of Embodiment 1-1 of the present invention is shown;

[0025] Figure 3 The structural schematic diagram of the optical imaging lens of Embodiment 1-2 of the present invention is shown;

[0026] Figure 4 The structural schematic diagram of the optical imaging lens of Embodiment 1-3 of the present invention is shown;

[0027] Figures 5 to 7 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Embodiment 1 of the present invention are respectively shown;

[0028] Figure 8 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-1 of the present invention is shown;

[0029] Figure 9 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-2 of the present invention is shown;

[0030] Figure 10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0031] Figures 11 to 13 axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to the second embodiment of the present invention are respectively shown;

[0032] Figure 14 1. A schematic structural diagram of an optical imaging lens according to embodiment 3-1 of the present invention is shown;

[0033] Figure 15 A schematic structural diagram of an optical imaging lens according to embodiment 3-2 of the present invention is shown;

[0034] Figure 16 Schematic diagram of the structure of the optical imaging lens of Example 3-3 of the present invention is shown;

[0035] Figures 17 to 19 axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to the third embodiment of the present invention are respectively shown;

[0036] Figure 20 Schematic diagram of the structure of the optical imaging lens of Example 4-1 of the present invention is shown;

[0037] Figure 21 A schematic structural diagram of an optical imaging lens according to embodiment 4-2 of the present invention is shown;

[0038] Figure 22 A schematic structural diagram of an optical imaging lens according to embodiment 4-3 of the present invention is shown;

[0039] Figures 23 to 25 axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to the fourth embodiment of the present invention are respectively shown;

[0040] Figure 26 A modulation transfer function defocus curve diagram of the optical imaging lens of solution 1 of the present invention is shown when L / (T45+T56)=4.84, f5 / d5s=1.55, and (D5s-d4s) / EP45=10.11 is satisfied;

[0041] Figure 27A modulation transfer function defocus curve diagram of the optical imaging lens of Comparative Example 1 is shown when L / (T45+T56)=4.84, f5 / d5s=1.10, and (D5s-d4s) / EP45=6.50;

[0042] Figure 28 A modulation transfer function defocus curve diagram of the optical imaging lens of Comparative Example 2 is shown when L / (T45+T56)=4.84, f5 / d5s=1.70, and (D5s-d4s) / EP45=13.00.

[0043] The above drawings include the following reference numerals:

[0044] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; P1, first spacer; P2, second spacer; P3, third spacer; P3b, third auxiliary spacer; P4, fourth spacer; P4b, fourth auxiliary spacer; P5, fifth spacer; P5b, fifth auxiliary spacer; P5c, fifth auxiliary spacer. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0047] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0048] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0049] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0050] 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 shape in the paraxial area can be based on the judgment method of ordinary knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, 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; for the image side, 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.

[0051] In this application, the object side refers to the side of the optical imaging lens facing the object to be photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging surface. Hereinafter, the object side of the lens refers to the side surface of the lens facing the object to be photographed (not shown in the figure), and the image side of the lens refers to the side surface of the lens facing the imaging surface. The object side of the spacer refers to the side surface of the spacer facing the object to be photographed (not shown in the figure), and the image side of the spacer refers to the side surface of the spacer facing the imaging surface.

[0052] In the structural diagram shown in this application, the left side is the object side and the right side is the image side.

[0053] To address the problem in the prior art of six-element optical imaging lenses of large air gaps between adjacent lenses on the image side, which easily affects the progression of light and causes field curvature shift and peak drop in the modulation transfer function defocus curve, the present invention provides an optical imaging lens.

[0054] like Figures 1 to 28As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a spacer assembly disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. Among them, the object side surface of the first lens is concave, and the image side surface of the first lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The spacer assembly includes a fourth spacer disposed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens. The number of spacers located between the fourth lens and the fifth lens is one or more, and the number of spacers located between the fifth lens and the sixth lens is one or more.

[0055] The maximum axial height L of the lens barrel, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.20 < L / (T45 + T56) < 4.95; the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 1.15 < f5 / d5s < 1.65; the interval distance EP45 on the optical axis from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 7.00 < (D5s - d4s) / EP45 < 11.90.

[0056] The optical imaging lens of the present application is configured such that the first lens has a negative focal power, the second lens has a focal power, the third lens has a positive focal power, the fourth lens has a negative focal power, the fifth lens has a positive focal power, and the sixth lens has a negative focal power. The object side surface of the first lens is concave, and the image side surface of the first lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. At the same time, 4.20 < L / (T45 + T56) < 4.95 is satisfied. It can be seen that the air gap between the fourth lens and the fifth lens on the optical axis and the air gap between the fifth lens and the sixth lens on the optical axis account for a relatively large proportion of the maximum axial height of the lens barrel. When the air gap between two adjacent lenses among the fourth lens, the fifth lens, and the sixth lens is relatively large, it will cause additional scattering and refraction losses when light passes through these lenses, and affect the progress of light, thereby affecting the field curvature of the outer field of view and causing the modulation transfer function defocus curve to exhibit field curvature shift and peak drop. Therefore, by constraining 1.15 < f5 / d5s < 1.65 and 7.00 < (D5s - d4s) / EP45 < 11.90, the present application can constrain the refraction angle of light after passing through the fifth lens, avoid the situation of field curvature variation caused by too large light incident angle, and at the same time control the edge thickness of the fifth lens and the variation gap of the outer diameter of the fifth spacer to ensure the uniform propagation of light, reduce the occlusion and reflection of light between the fifth lens, the fourth spacer, and the fifth spacer, thereby reducing the degree of field curvature shift of the outer field of view and being beneficial to ensuring that the peak is at a relatively high level, thus improving the imaging performance of the optical imaging lens.

[0057] It should be noted that the maximum axial height L of the lens barrel is actually the distance between the object side surface and the image side surface of the lens barrel on the optical axis.

[0058] In an alternative embodiment of the present application, one or more spacers may be provided between the fourth lens and the fifth lens. When only one spacer is provided between the fourth lens and the fifth lens, the spacer is the above-mentioned fourth spacer; when two spacers are provided between the fourth lens and the fifth lens, the two spacers include the above-mentioned fourth spacer and a fourth auxiliary spacer located on the image side of the fourth spacer and at least partially contacting the image side surface of the fourth spacer.

[0059] In addition, referring to Table 1 below, Figures 26 to 28 as shown in, Figures 26 to 28 shows the curves of four fields of view in the T direction at a spatial frequency of 110. Specifically, Figure 26 shows the modulation transfer function defocus curve diagram of the optical imaging lens of Solution 1 of the present invention when L / (T45 + T56) = 4.84, f5 / d5s = 1.55, and (D5s - d4s) / EP45 = 10.11. Figure 27The modulation transfer function defocus curve graph when the optical imaging lens of Comparative Example 1 satisfies L / (T45 + T56) = 4.84, f5 / d5s = 1.10, and (D5s - d4s) / EP45 = 6.50 is shown. Figure 28 The modulation transfer function defocus curve graph when the optical imaging lens of Comparative Example 2 satisfies L / (T45 + T56) = 4.84, f5 / d5s = 1.70, and (D5s - d4s) / EP45 = 13.00 is shown.

[0060] It can be seen from Figures 26 to 28 that when L / (T45 + T56) = 4.84, f5 / d5s = 1.55, and (D5s - d4s) / EP45 = 10.11 are satisfied, the peaks of most fields of the modulation transfer function defocus curve are relatively high, and the concentration is relatively good. At the same time, the field curvature offset is relatively small, and the performance is relatively good. When L / (T45 + T56) = 4.84, f5 / d5s = 1.10, and (D5s - d4s) / EP45 = 6.50 are satisfied, the peaks of some fields drop significantly, and the field curvature is negatively biased, and the performance is poor. When L / (T45 + T56) = 4.84, f5 / d5s = 1.70, and (D5s - d4s) / EP45 = 13.00 are satisfied, the peaks of some fields drop significantly, the sensitivity is relatively high, and the field curvature is positively biased more, and the performance is poor. Thus, it can be seen that when 4.20 < L / (T45 + T56) < 4.95 and f5 / d5s is controlled within the range of 1.15 to 1.65, and (D5s - d4s) / EP45 is within the range of 7.00 to 11.90, the peak of the modulation transfer function defocus curve of the optical imaging lens is relatively high, the concentration is relatively good, and the field curvature offset is relatively small, and the performance is relatively good. Therefore, in this application, by restricting 4.20 < L / (T45 + T56) < 4.95, 1.15 < f5 / d5s < 1.65, and 7.00 < (D5s - d4s) / EP45 < 11.90, the refraction angle of the light after passing through the fifth lens is restricted, avoiding the situation of field curvature variation caused by too large light incident angle. At the same time, the edge thickness of the fifth lens can be controlled, and the change gap of the outer diameter of the fifth spacer can ensure the uniform propagation of light, reducing the occlusion and reflection of light between the fifth lens, the fourth spacer, and the fifth spacer, thereby reducing the field curvature offset degree of the outer field, and at the same time being beneficial to ensuring that the peak is at a relatively high level, thus improving the imaging performance of the optical imaging lens.

[0061] Table 1

[0062]

[0063] In this embodiment, the spacer assembly further includes a first spacer disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens, a second spacer disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens.

[0064] In this embodiment, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex. The surface shape of the second lens is set to be convex-concave, which helps to expand the field angle of the optical imaging lens, so that a wider scene can be captured. By reasonably planning the surface shapes of each lens, the focusing of light can be better controlled, thereby improving the imaging quality and reducing distortion.

[0065] In this embodiment, the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -6.80 < f1 / d1s < -4.45; the effective focal length f6 of the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -2.75 < f6 / d5s < -2.25. By controlling the ratios of the effective focal lengths of the first lens and the sixth lens to the inner diameters of the object side surfaces of the first spacer and the fifth spacer respectively, it is possible to ensure that the light entering the optical imaging lens propagates in the designed direction, so as to ensure that there is enough light passing through the aperture of the fifth spacer and then refracted by the sixth lens to reach a sufficient field angle while maintaining the light transmission amount.

[0066] In this embodiment, the effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 3.85 < f1 / R1 < 5.05; the central thickness CT1 of the first lens on the optical axis and the interval distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer satisfy 2.10 < EP01 / CT1 < 3.20. By controlling this conditional formula, it is beneficial to restrict the axial dimension ratio of the first lens and the position of the optical axis, and is beneficial to controlling the light passing amount. Ensure that the imaging quality of the optical imaging lens is maintained within a certain range, and avoid the phenomenon of large fluctuations in image quality and the phenomenon of strong stray glare caused by ineffective light not being blocked.

[0067] It should be noted that ineffective light rays refer to those light rays that do not participate in the imaging process. This includes light rays that enter the optical imaging lens but do not focus on the imaging surface, or light rays that are scattered, reflected, or absorbed inside the optical imaging lens. Ineffective light rays can be caused by physical limitations of the design, or may be due to factors such as unevenness of the lens surface, dust, scratches, or uneven coating.

[0068] In this embodiment, the inner diameter d5mn of the image side surface of the spacer closest to the image side between the fifth lens and the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 1.25 < d5mn / d5s < 1.40. By restricting the ratio of the inner diameter of the object side surface to the inner diameter of the image side surface of the spacer between the fifth lens and the sixth lens, it is beneficial for the spacer to intercept excess light rays at the edge and avoid intercepting effective light rays.

[0069] In an alternative embodiment of the present application, one or more spacers may be provided between the fifth lens and the sixth lens. When only one spacer is provided between the fifth lens and the sixth lens, this spacer is the above-mentioned fifth spacer. At this time, d5mn is the inner diameter of the image side surface of the fifth spacer. When two spacers are provided between the fifth lens and the sixth lens, these two spacers include the above-mentioned fifth spacer and a fifth auxiliary spacer located on the image side of the fifth spacer and at least partially contacting the image side surface of the fifth spacer. At this time, d5mn is the inner diameter of the image side surface of the fifth auxiliary spacer. When three spacers are provided between the fifth lens and the sixth lens, these three spacers include the above-mentioned fifth spacer, a fifth auxiliary spacer located on the image side of the fifth spacer and at least partially contacting the image side surface of the fifth spacer, and a fifth secondary auxiliary spacer located on the image side of the fifth auxiliary spacer and at least partially contacting the image side surface of the fifth auxiliary spacer. At this time, d5mn is the inner diameter of the image side surface of the fifth secondary auxiliary spacer.

[0070] In this embodiment, the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 9.40 < (R10 - R11) / (R10 + R11) < 22.35. By controlling the relationship between the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the object side surface of the sixth lens, the light ray deflection path can be optimized and the aberration can be corrected.

[0071] It should be noted that when only the fifth spacer is provided between the fifth lens and the sixth lens, ∑CP5 is the maximum axial thickness of the fifth spacer. When two spacers are provided between the fifth lens and the sixth lens, namely the fifth spacer and the fifth auxiliary spacer respectively, ∑CP5 is the sum of the maximum axial thickness of the fifth spacer and the maximum axial thickness of the fifth auxiliary spacer. When three spacers are provided between the fifth lens and the sixth lens, and the three spacers are the fifth spacer, the fifth auxiliary spacer and the fifth secondary auxiliary spacer respectively, ∑CP5 is the sum of the maximum axial thickness of the fifth spacer, the maximum axial thickness of the fifth auxiliary spacer and the maximum axial thickness of the fifth secondary auxiliary spacer.

[0072] In this embodiment, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer on the optical axis, the maximum axial thickness CP4 of the fourth spacer, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 0.90 < (EP34 + CP4) / T45 < 1.60. By constraining this conditional formula, it is beneficial to control the thicknesses of the third lens and the fourth lens, optimize the structures of the third lens and the fourth lens while improving the imaging ability, and reduce the risk of stray light generated at the edge position of the effective diameter of the fourth lens.

[0073] In this embodiment, the sum ∑CP5 of the maximum axial thicknesses of all the spacers located between the fifth lens and the sixth lens and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.75 < ∑CP5 / T56 < 1.45. Through the proportional relationship between the sum of the maximum axial thicknesses of all the spacers located between the fifth lens and the sixth lens and the air gap between the fifth lens and the sixth lens on the optical axis, it is beneficial to constrain the positions of the fifth lens and the sixth lens, so as to achieve a compact design of the optical imaging lens while maintaining the optical performance.

[0074] In this embodiment, the inner diameter d1m of the image side surface of the first spacer and the inner diameter d2s of the object side surface of the second spacer satisfy: 1.30 < d1m / d2s < 1.55; the inner diameter d3s of the object side surface of the third spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.20 < d3s / d2m < 1.70. By controlling these two conditional formulas, it is beneficial to ensure that the light passes through the first spacer to the third spacer in accordance with the designed direction, so as to control the amount of light entering the second lens and the third lens and reduce the stray light generated at the edge position of the effective diameter on the object side of the third lens.

[0075] In this embodiment, the distance EP23 between the image side surface of the second spacer and the object side surface of the third spacer on the optical axis, the maximum axial thickness CP3 of the third spacer, and the central thickness CT3 of the third lens on the optical axis satisfy: 0.85 < (EP23 + CP3) / CT3 < 1.30; the air gap T23 between the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy: 18.40 < T23 / CP2 < 27.95. By controlling these two conditional expressions, the positions and axial dimensions of the second lens and the third lens can be restricted, thereby playing a role in balancing aberrations and ensuring that the optical imaging lens achieves uniform imaging performance across the entire field of view.

[0076] In this embodiment, the radius of curvature R10 of the image side surface of the fifth lens, the radius of curvature R11 of the object side surface of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -0.65 < (R10 + R11) / T56 < -0.20; the maximum value D5mx of the outer diameters of the image side surfaces of all the spacers located between the fifth lens and the sixth lens and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 2.50 < D5mx / d4s < 3.05. By restricting the relationship between the radius of curvature of the image side surface of the fifth lens, the radius of curvature of the object side surface of the sixth lens, and the air gap between the fifth lens and the sixth lens on the optical axis, it is beneficial to control the positions and axial dimensions of the fifth lens and the sixth lens, and synchronously restrict the ratio relationship between the maximum value of the outer diameters of the image side surfaces of all the spacers between the fifth lens and the sixth lens and the inner diameter of the object side surface of the fourth spacer, thereby restricting the propagation path of light between the fifth lens and the sixth lens, so that while the optical imaging lens meets the optical performance requirements, the stray light at the edge position of the effective diameter on the image side of the fifth lens is reduced.

[0077] In this embodiment, the sum ∑CT of the central thicknesses of the first lens to the sixth lens on the optical axis, the sum ∑AT of the air gaps between adjacent two lenses among the first lens to the sixth lens on the optical axis, and half of the maximum field of view Semi-FOV of the optical imaging lens satisfy: 0.90 ≤ ∑CT / ∑AT / Tan(Semi-FOV) ≤ 1.15. Restricting this conditional expression is beneficial to controlling the positions and central thicknesses of each lens on the optical axis, ensuring that the optical imaging lens meets the wide-angle design requirements while ensuring high imaging performance.

[0078] It should be noted that the above ∑CT is the sum of the central thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens on the optical axis. The above ∑AT is the sum of the air gaps between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens, and between the fifth lens and the sixth lens on the optical axis.

[0079] In this embodiment, the effective focal length f of the optical imaging lens, the maximum axial height L of the lens barrel, and the distance TD on the optical axis from the object side of the first lens to the image side of the sixth lens satisfy: 4.90 < f / (L - TD) < 6.90. By constraining this conditional formula, it is beneficial to constrain the positions of the first lens and the sixth lens, thereby ensuring the imaging ability of the optical imaging lens while meeting the requirements of a compact structure design.

[0080] In this embodiment, the effective focal length f5 of the fifth lens, the inner diameter d5s of the object side of the fifth lens, and the inner diameter d4mn of the image side of the spacer closest to the image side located between the fourth lens and the fifth lens satisfy: 3.65 < f5 / (d5s - d4mn) < 8.10. Controlling this conditional formula is beneficial to constraining the sizes of the fourth lens and the fifth lens and the sizes of the corresponding spacers, ensuring that the light rays in the optical imaging lens propagate in the designed direction, and at the same time reducing the risk of stray light generation between the effective diameter on the image side of the fourth lens and the effective diameter on the object side of the fifth lens.

[0081] It should be noted that when only the fourth spacer is provided between the fourth lens and the fifth lens, d4mn is the inner diameter of the image side of the fourth spacer. When two spacers are provided between the fourth lens and the fifth lens, and the two spacers are the fourth spacer and the fourth auxiliary spacer respectively, d4mn is the inner diameter of the image side of the fourth auxiliary spacer.

[0082] In addition, in another alternative embodiment of the present application, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer assembly disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens with a positive focal power, and a sixth lens with a negative focal power. Among them, the object side surface of the first lens is concave, and the image side surface of the first lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The spacer assembly includes a fourth spacer disposed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens. The number of spacers between the fourth lens and the fifth lens is one or more, and the number of spacers between the fifth lens and the sixth lens is one or more. The maximum axial height L of the lens barrel, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.20 < L / (T45 + T56) < 4.95. The effective focal length f5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth lens, and the inner diameter d4mn of the image side surface of the spacer closest to the image side between the fourth lens and the fifth lens satisfy: 3.65 < f5 / (d5s - d4mn) < 8.10. The spacer distance EP45 on the optical axis from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 7.00 < (D5s - d4s) / EP45 < 11.90.

[0083] The optical imaging lens of the present application is configured such that the first lens has a negative focal power, the second lens has a focal power, the third lens has a positive focal power, the fourth lens has a negative focal power, the fifth lens has a positive focal power, and the sixth lens has a negative focal power. The object side of the first lens is concave, and the image side of the first lens is convex; the object side of the sixth lens is convex, and the image side of the sixth lens is concave. At the same time, 4.20 < L / (T45 + T56) < 4.95 is satisfied. It can be seen that the air gap between the fourth lens and the fifth lens on the optical axis and the air gap between the fifth lens and the sixth lens on the optical axis account for a relatively large proportion of the maximum axial height of the lens barrel. When the air gaps between adjacent two of the fourth lens, the fifth lens, and the sixth lens are relatively large, it will cause additional scattering and refraction losses when light passes through these lenses, affect the light path, and further affect the field curvature of the outer field of view, resulting in field curvature deviation and peak drop in the modulation transfer function defocus curve. Therefore, by restricting 3.65 < f5 / (d5s - d4mn) < 8.10 and 7.00 < (D5s - d4s) / EP45 < 11.90, it is beneficial to restrict the sizes of the fourth lens and the fifth lens and the radial sizes of the corresponding spacers. The light between the fourth lens and the fifth lens propagates according to the designed trend. At the same time, the refraction angle of the light after passing through the fifth lens can be restricted, avoiding the situation of field curvature variation caused by too large light incident angle, controlling the edge thickness of the fifth lens, and ensuring the uniform propagation of light by controlling the outer diameter change gap of the fifth spacer, reducing the occlusion and reflection of light between the fifth lens, the fourth spacer, and the fifth spacer, thereby reducing the field curvature deviation degree of the outer field of view and being beneficial to ensuring that the peak is at a relatively high level, thus improving the imaging performance of the optical imaging lens.

[0084] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0085] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0086] The optical imaging lens in the present application may employ multiple lenses, such as the six lenses described above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature continuously changes 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.

[0087] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe an optical imaging lens using six lenses as an example, the optical imaging lens is not limited to six lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0088] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to an optional embodiment of the present invention is shown. Figure 1 Parameters such as d1s, d1m, d2s, d2m, d3s, d4s, d4bm, d5s, d5cm, D5s, D5Cm, EP01, CP2, EP23, CP3, EP34, CP4, L, EP45, CP5, CP5b, and CP5c are labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical imaging lenses and specific lens surface shapes, these parameters will not be reflected in the drawings when describing specific embodiments.

[0089] exist Figure 1 In the figure, the inner diameter d5mn of the image-side surface of the spacer closest to the image side between the fifth and sixth lenses is equal to the inner diameter d5cm of the image-side surface of the fifth auxiliary spacer. The sum of the maximum axial thicknesses of all spacers between the fifth and sixth lenses, ∑CP5, is equal to the maximum axial thickness CP5 of the fifth spacer + the maximum axial thickness CP5b of the fifth auxiliary spacer + the maximum axial thickness CP5c of the fifth auxiliary spacer. The maximum outer diameter D5mx of the image-side surfaces of all spacers between the fifth and sixth lenses can be one of the outer diameter D5m of the image-side surface of the fifth spacer, the outer diameter D5bm of the image-side surface of the fifth auxiliary spacer, and the outer diameter D5cm of the image-side surface of the fifth auxiliary spacer. The inner diameter d4mn of the image-side surface of the spacer closest to the image side between the fourth and fifth lenses is equal to the inner diameter d4bm of the image-side surface of the fourth auxiliary spacer. Examples of specific surface shapes and parameters applicable to the optical imaging lens of the above-described embodiment are further described below with reference to the accompanying drawings. It should be noted that in the following Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3; in Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3; and in Example 4, there are three examples: Example 4-1, Example 4-2, and Example 4-3. While the optical imaging lenses in the different examples have different structures, the optical parameters of the three examples in the same embodiment are the same, namely, the curvature radius, center thickness, and other parameters of the first to sixth lenses, as well as the spacing between the lenses and the coefficients of the higher-order terms are the same.

[0090] It should be noted that any one of the following embodiments 1 to 4 is applicable to all embodiments of the present application.

[0091] Example 1

[0092] like Figures 2 to 7 As shown, the optical imaging lens of embodiment 1 is described. Figure 2 1-1 shows a schematic structural diagram of the optical imaging lens of Example 1-1. Figure 3 Schematic diagram of the structure of the optical imaging lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of the optical imaging lenses of Examples 1-3 are shown.

[0093] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth lens E6, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0.

[0094] like Figure 2 , which is a schematic structural diagram of the optical imaging lens of Example 1-1. In this example, the object-side surface and image-side surface of the first spacer P1 are at least partially in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 are at least partially in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 are at least partially in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are at least partially in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 are at least partially in contact with the image-side surface S10 of the fifth lens and the object-side surface of the fifth auxiliary spacer P5b, respectively. The image-side surface of the fifth auxiliary spacer P5b is at least partially in contact with the object-side surface S11 of the sixth lens.

[0095] like Figure 3 2 is a schematic structural diagram of the optical imaging lens of Example 1-2. This example differs from Example 1-1 in that a fourth auxiliary spacer P4b is further provided on the image side of the fourth spacer P4. The object-side and image-side surfaces of the fourth auxiliary spacer P4b are at least partially in contact with the image-side surface of the fourth spacer P4 and the object-side surface S9 of the fifth lens element, respectively. The contact structure of the remaining spacers is the same as that of Example 1-1, and reference may be made to the relevant description in Example 1-1, which will not be repeated here.

[0096] like Figure 4 2 is a schematic structural diagram of the optical imaging lens of Example 1-3. This example differs from Example 1-2 in that a fifth auxiliary spacer P5c is further provided on the image side of the fifth auxiliary spacer P5b. In this case, the object-side and image-side surfaces of the fifth auxiliary spacer P5c are at least partially in contact with the image-side surface of the fifth auxiliary spacer P5b and the object-side surface S11 of the sixth lens element, respectively. The contact mechanism of the remaining spacers is the same as that of Example 1-2, and reference may be made to the relevant description of Example 1-2, which will not be repeated here.

[0097] In summary, the structural parameters of the optical imaging lens of Example 1 in Examples 1-1, 1-2, and 1-3 are shown in Table 2 (unit: mm).

[0098] Table 2

[0099] Parameters\Example 1-1 1-2 1-3 d1s 2.559 2.740 2.493 d1m 2.559 2.740 2.493 d2s 1.776 1.776 1.776 d2m 1.746 1.746 1.746 d3s 2.207 2.207 2.207 d4s 2.897 2.801 2.801 d5s 3.812 3.827 4.003 D5s 7.243 7.243 7.482 EP01 1.132 1.058 1.159 CP2 0.022 0.022 0.022 EP23 0.529 0.529 0.529 CP3 0.022 0.022 0.022 EP34 0.746 0.601 0.601 CP4 0.022 0.235 0.235 L 6.029 5.960 5.971 ∑CP5 0.986 0.986 0.742 D5mx 7.767 7.767 7.767 d5mn 5.299 5.299 5.299 d4mn 2.897 3.025 3.025 EP45 0.464 0.374 0.640

[0100] In Example 1, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0101] In Example 1, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 52.09°, the effective focal length f of the optical imaging lens is 3.32 mm, the effective focal length f1 of the first lens is -12.86 mm, the effective focal length f2 of the second lens is 64.84 mm, the effective focal length f3 of the third lens is 3.45 mm, the effective focal length f4 of the fourth lens is -8.89 mm, the effective focal length f5 of the fifth lens is 4.73 mm, and the effective focal length f6 of the sixth lens is -9.13 mm.

[0102] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S13 and S14 (not shown) can represent the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S15 (not shown) represents the imaging surface.

[0103] Table 3

[0104]

[0105] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the sixth lens E6 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0106]

[0107] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; and Ai is the i-th order correction coefficient of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S12 in Example 1.

[0108] Table 4

[0109] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.68E-01 -2.11E-01 1.73E-01 -1.15E-01 5.65E-02 -1.92E-02 4.20E-03 -5.32E-04 2.92E-05 S2 3.21E-01 -2.90E-01 3.42E-01 -3.91E-01 3.64E-01 -2.40E-01 1.02E-01 -2.47E-02 2.58E-03 S3 7.00E-02 -2.78E-01 6.25E-01 -1.21E+00 1.53E+00 -1.21E+00 5.64E-01 -1.36E-01 1.26E-02 S4 7.50E-02 -3.61E-01 1.84E+00 -6.52E+00 1.44E+01 -1.99E+01 1.67E+01 -7.75E+00 1.53E+00 S5 -1.10E-02 2.44E-01 -1.95E+00 8.14E+00 -1.99E+01 2.92E+01 -2.55E+01 1.21E+01 -2.41E+00 S6 -1.16E-01 7.94E-01 -4.92E+00 1.71E+01 -3.47E+01 4.24E+01 -3.06E+01 1.20E+01 -1.98E+00 S7 -1.76E-01 4.96E-02 1.04E+00 -4.40E+00 9.16E+00 -1.11E+01 7.82E+00 -3.00E+00 4.83E-01 S8 -1.63E-01 3.43E-01 -9.47E-01 1.97E+00 -2.60E+00 2.11E+00 -1.03E+00 2.74E-01 -3.07E-02 S9 -3.42E-02 5.48E-02 -1.43E-01 2.55E-01 -2.68E-01 1.71E-01 -6.52E-02 1.37E-02 -1.22E-03 S10 -4.93E-02 4.19E-02 1.13E-02 -4.63E-02 4.35E-02 -2.02E-02 5.01E-03 -6.32E-04 3.10E-05 S11 -1.04E-01 5.63E-02 -3.47E-02 1.76E-02 -5.90E-03 1.23E-03 -1.55E-04 1.07E-05 -3.09E-07 S12 -2.27E-01 1.11E-01 -4.19E-02 1.09E-02 -1.89E-03 2.13E-04 -1.49E-05 5.85E-07 -9.90E-09

[0110] Figure 5 The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6 The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion values corresponding to different image heights.

[0111] according to Figures 5 to 7 It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-1. Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-2. Figure 10 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0114] like Figures 8 to 10As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth lens E6, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0.

[0115] like Figure 8 , which is a schematic structural diagram of the optical imaging lens of Example 2-1. In this example, the object-side surface and image-side surface of the first spacer P1 are at least partially in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 are at least partially in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 are at least partially in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are at least partially in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 are at least partially in contact with the image-side surface S10 of the fifth lens and the object-side surface of the fifth auxiliary spacer P5b, respectively. The image-side surface of the fifth auxiliary spacer P5b is at least partially in contact with the object-side surface S11 of the sixth lens.

[0116] like Figure 9 FIG2 is a schematic structural diagram of an optical imaging lens according to Example 2-2. This example differs from Example 2-1 in that a fifth auxiliary spacer P5c is further provided on the image side of the fifth auxiliary spacer P5b. The object-side and image-side surfaces of the fifth auxiliary spacer P5c are in at least partial contact with the image-side surface of the fifth auxiliary spacer P5b and the object-side surface S11 of the sixth lens element, respectively. The contact mechanism of the remaining spacers is the same as that of Example 2-1, and reference may be made to the relevant description in Example 2-1, which will not be repeated here.

[0117] like Figure 10 FIG2 is a schematic diagram of the structure of an optical imaging lens according to Example 2-3. This example differs from Example 2-2 in that a third auxiliary spacer P3b is further provided on the image side of the third spacer P3. In this case, the object-side and image-side surfaces of the third auxiliary spacer P3b are in at least partial contact with the image-side surface of the third spacer P3 and the object-side surface S7 of the fourth lens element, respectively. The contact mechanism of the remaining spacers is the same as that of Example 2-2, and reference may be made to the relevant description in Example 2-2, which will not be repeated here.

[0118] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5 (unit: mm).

[0119] Table 5

[0120] Parameters\Example 2-1 2-2 2-3 d1s 2.418 2.553 2.389 d1m 2.418 2.553 2.389 d2s 1.812 1.812 1.812 d2m 1.783 1.783 1.783 d3s 2.177 2.166 2.252 d4s 2.577 2.577 2.577 d5s 3.824 3.746 3.706 D5s 7.120 7.540 7.599 EP01 1.159 1.104 1.185 CP2 0.022 0.022 0.022 EP23 0.714 0.685 0.428 CP3 0.022 0.022 0.287 EP34 0.544 0.573 0.570 CP4 0.022 0.022 0.022 L 5.933 5.952 5.933 ∑CP5 0.810 0.663 0.664 D5mx 7.759 7.640 7.699 d5mn 4.905 4.905 4.905 d4mn 2.577 2.577 2.577 EP45 0.509 0.656 0.656

[0121] In Example 2, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0122] In Example 2, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 49.72°, the effective focal length f of the optical imaging lens is 3.31 mm, the effective focal length f1 of the first lens is -12.87 mm, the effective focal length f2 of the second lens is -2385.25 mm, the effective focal length f3 of the third lens is 3.45 mm, the effective focal length f4 of the fourth lens is -9.67 mm, the effective focal length f5 of the fifth lens is 4.56 mm, and the effective focal length f6 of the sixth lens is -8.72 mm.

[0123] Table 6 shows the basic structural parameters of the optical imaging lens of Example 2, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S13 and S14 (not shown) can represent the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S15 (not shown) represents the imaging surface.

[0124] Table 6

[0125]

[0126] Table 7 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S1-S12 in Example 2.

[0127] Table 7

[0128]

[0129]

[0130] Figure 11 The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 12 The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 13 The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion values corresponding to different image heights.

[0131] according to Figures 11 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0132] Example 3

[0133] like Figures 14 to 19 As shown, the optical imaging lens of Example 3 is described. Figure 14 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-1. Figure 15 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-2. Figure 16 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0134] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth lens E6, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0.

[0135] like Figure 14 , which is a schematic structural diagram of the optical imaging lens of Example 3-1. In this example, the object-side surface and image-side surface of the first spacer P1 are at least partially in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 are at least partially in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 are at least partially in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are at least partially in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 are at least partially in contact with the image-side surface S10 of the fifth lens and the object-side surface of the fifth auxiliary spacer P5b, respectively. The image-side surface of the fifth auxiliary spacer P5b is at least partially in contact with the object-side surface S11 of the sixth lens.

[0136] like Figure 15, which is a schematic structural diagram of the optical imaging lens of Example 3-2. This example differs from Example 3-1 in that a third auxiliary spacer P3b is further provided on the image side of the third spacer P3. The object-side and image-side surfaces of the third auxiliary spacer P3b are at least partially in contact with the image-side surface of the third spacer P3 and the object-side surface S7 of the fourth lens, respectively. The contact method of the remaining spacers is the same as that of Example 3-1, and reference may be made to the relevant description in Example 3-1, which will not be repeated here.

[0137] like Figure 16 FIG3 is a schematic structural diagram of an optical imaging lens according to Example 3-3. This example differs from Example 3-2 in that a fifth auxiliary spacer P5c is further provided on the image side of the fifth auxiliary spacer P5b. The object-side and image-side surfaces of the fifth auxiliary spacer P5c are in at least partial contact with the image-side surface of the fifth auxiliary spacer P5b and the object-side surface S11 of the sixth lens element, respectively. The contact mechanism of the remaining spacers is the same as that of Example 3-2, and reference may be made to the relevant description in Example 3-2, which will not be repeated here.

[0138] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8 (unit: mm).

[0139] Table 8

[0140] Parameters\Example 3-1 3-2 3-3 d1s 2.487 2.556 2.503 d1m 2.487 2.556 2.503 d2s 1.864 1.864 1.864 d2m 1.835 1.835 1.835 d3s 2.471 2.708 2.252 d4s 2.943 2.943 2.943 d5s 3.690 3.690 3.859 D5s 6.926 6.886 7.565 EP01 1.003 0.974 0.996 CP2 0.022 0.022 0.022 EP23 0.731 0.522 0.522 CP3 0.022 0.396 0.396 EP34 0.731 0.566 0.566 CP4 0.022 0.022 0.022 L 5.974 5.953 5.961 ∑CP5 0.810 0.810 0.612 D5mx 7.565 7.565 7.465 d5mn 4.965 4.965 4.965 d4mn 2.943 2.943 2.943 EP45 0.394 0.394 0.589

[0141] In Example 3, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0142] In Example 3, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 52.95°, the effective focal length f of the optical imaging lens is 3.31 mm, the effective focal length f1 of the first lens is -11.44 mm, the effective focal length f2 of the second lens is -186.58 mm, the effective focal length f3 of the third lens is 2.69 mm, the effective focal length f4 of the fourth lens is -6.86 mm, the effective focal length f5 of the fifth lens is 6.03 mm, and the effective focal length f6 of the sixth lens is -8.86 mm.

[0143] Table 9 shows the basic structural parameters of the optical imaging lens of Example 3, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) is the object distance. STO (not shown) is the aperture stop, located between the second lens element E2 and the third lens element E3. S13 and S14 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S15 (not shown) is the imaging surface.

[0144] Table 9

[0145]

[0146] Table 10 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S1-S12 in Example 3.

[0147] Table 10

[0148] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.57E-01 -2.15E-01 1.85E-01 -1.28E-01 6.49E-02 -2.26E-02 5.07E-03 -6.54E-04 3.66E-05 S2 3.47E-01 -3.71E-01 5.51E-01 -7.78E-01 8.53E-01 -6.34E-01 2.94E-01 -7.59E-02 8.17E-03 S3 5.87E-02 -3.37E-01 7.77E-01 -1.69E+00 2.56E+00 -2.51E+00 1.52E+00 -5.20E-01 7.64E-02 S4 4.57E-02 -2.67E-01 9.90E-01 -3.07E+00 6.13E+00 -7.61E+00 5.75E+00 -2.42E+00 4.34E-01 S5 -6.48E-03 6.16E-03 -1.30E-01 5.34E-01 -1.29E+00 1.91E+00 -1.68E+00 8.09E-01 -1.63E-01 S6 -4.15E-02 4.11E-02 -5.48E-02 -1.90E-01 7.77E-01 -1.24E+00 1.05E+00 -4.72E-01 8.78E-02 S7 -1.56E-01 2.60E-01 -5.31E-01 8.35E-01 -9.27E-01 6.94E-01 -3.29E-01 8.81E-02 -1.01E-02 S8 -1.72E-01 2.73E-01 -4.31E-01 5.48E-01 -5.03E-01 3.15E-01 -1.27E-01 2.90E-02 -2.86E-03 S9 -2.90E-02 4.18E-02 -2.79E-02 1.69E-02 3.25E-03 -1.26E-02 7.77E-03 -2.07E-03 2.12E-04 S10 -6.74E-02 7.99E-02 -5.44E-02 2.69E-02 -5.10E-03 -7.48E-04 4.17E-04 -4.99E-05 1.96E-06 S11 -1.26E-01 4.16E-02 -1.17E-03 -5.96E-03 2.88E-03 -6.94E-04 9.54E-05 -7.13E-06 2.25E-07 S12 -2.40E-01 1.17E-01 -4.24E-02 1.06E-02 -1.78E-03 1.98E-04 -1.38E-05 5.49E-07 -9.43E-09

[0149] Figure 17 The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 18 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 19 The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion values corresponding to different image heights.

[0150] according to Figures 17 to 19 It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0151] Example 4

[0152] like Figures 20 to 25 As shown, the optical imaging lens of Example 4 is described. Figure 20 FIG4 shows a schematic structural diagram of the optical imaging lens of Example 4-1. Figure 21 FIG4 shows a schematic structural diagram of the optical imaging lens of Example 4-2. Figure 22 A schematic structural diagram of the optical imaging lens of Example 4-3 is shown.

[0153] like Figures 20 to 22As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth lens E6, which are arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0.

[0154] like Figure 20 , which is a schematic structural diagram of the optical imaging lens of Example 4-1. In this example, the object-side surface and image-side surface of the first spacer P1 are at least partially in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 are at least partially in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 are at least partially in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are at least partially in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the fifth spacer P5 are at least partially in contact with the image-side surface S10 of the fifth lens and the object-side surface of the fifth auxiliary spacer P5b, respectively. The image-side surface of the fifth auxiliary spacer P5b is at least partially in contact with the object-side surface S11 of the sixth lens.

[0155] like Figure 21 , which is a schematic structural diagram of the optical imaging lens of Example 4-2. This example differs from Example 4-1 in that a third auxiliary spacer P3b is further provided on the image side of the third spacer P3. The object-side and image-side surfaces of the third auxiliary spacer P3b are at least partially in contact with the image-side surface of the third spacer P3 and the object-side surface S7 of the fourth lens, respectively. The contact method of the remaining spacers is the same as that of Example 4-1, and reference may be made to the relevant description in Example 4-1, which will not be repeated here.

[0156] like Figure 22 FIG4 is a schematic structural diagram of the optical imaging lens of Example 4-3. This example differs from Example 4-2 in that a fifth auxiliary spacer P5c is further provided on the image side of the fifth auxiliary spacer P5b. In this case, the object-side and image-side surfaces of the fifth auxiliary spacer P5c are in at least partial contact with the image-side surface of the fifth auxiliary spacer P5b and the object-side surface S11 of the sixth lens element, respectively. The contact mechanism of the remaining spacers is the same as that of Example 4-2, and reference may be made to the relevant description in Example 4-2, which will not be repeated here.

[0157] In summary, the structural parameters of the optical imaging lens of Example 4 in Example 4-1, Example 4-2, and Example 4-3 are shown in Table 11 (unit: mm).

[0158] Table 11

[0159]

[0160]

[0161] In Example 4, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0162] In Example 4, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 52.46°, the effective focal length f of the optical imaging lens is 3.31 mm, the effective focal length f1 of the first lens is -17.06 mm, the effective focal length f2 of the second lens is -30.04 mm, the effective focal length f3 of the third lens is 2.63 mm, the effective focal length f4 of the fourth lens is -6.91 mm, the effective focal length f5 of the fifth lens is 6.47 mm, and the effective focal length f6 of the sixth lens is -11.34 mm.

[0163] Table 12 shows the basic structural parameters of the optical imaging lens of Example 4, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S13 and S14 (not shown) can represent the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S15 (not shown) represents the imaging surface.

[0164] Table 12

[0165]

[0166]

[0167] Table 13 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S1-S12 in Example 4.

[0168] Table 13

[0169] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.06E-01 -1.53E-01 1.19E-01 -7.38E-02 3.37E-02 -1.06E-02 2.14E-03 -2.51E-04 1.28E-05 S2 3.39E-01 -4.17E-01 6.97E-01 -1.03E+00 1.12E+00 -8.14E-01 3.70E-01 -9.43E-02 1.02E-02 S3 7.98E-02 -3.17E-01 5.30E-01 -7.54E-01 7.50E-01 -4.83E-01 1.84E-01 -3.62E-02 2.66E-03 S4 5.07E-02 -2.23E-01 8.72E-01 -2.67E+00 5.21E+00 -6.43E+00 4.82E+00 -2.01E+00 3.59E-01 S5 -8.23E-03 2.16E-02 -1.96E-01 7.61E-01 -1.86E+00 2.83E+00 -2.61E+00 1.33E+00 -2.88E-01 S6 -3.87E-02 7.38E-02 -3.17E-01 7.69E-01 -1.23E+00 1.27E+00 -8.17E-01 2.93E-01 -4.52E-02 S7 -1.13E-01 2.00E-01 -4.45E-01 7.25E-01 -8.16E-01 6.07E-01 -2.83E-01 7.39E-02 -8.18E-03 S8 -1.31E-01 1.93E-01 -2.85E-01 3.37E-01 -2.88E-01 1.69E-01 -6.31E-02 1.35E-02 -1.25E-03 S9 -3.71E-02 6.07E-02 -8.09E-02 1.10E-01 -8.63E-02 3.90E-02 -1.03E-02 1.51E-03 -9.56E-05 S10 -8.95E-02 1.08E-01 -6.61E-02 1.12E-02 2.79E-02 -2.40E-02 8.42E-03 -1.41E-03 9.33E-05 S11 -1.17E-01 5.38E-02 -1.60E-02 3.06E-03 -3.43E-04 1.54E-05 8.98E-07 -1.36E-07 4.60E-09 S12 -2.14E-01 9.72E-02 -3.23E-02 7.31E-03 -1.10E-03 1.09E-04 -6.75E-06 2.38E-07 -3.63E-09

[0170] Figure 23The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 24 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 25 The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion values corresponding to different image heights.

[0171] according to Figures 23 to 25 It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0172] In summary, Examples 1 to 4 respectively satisfy the relationships shown in Table 14.

[0173] Table 14

[0174]

[0175]

[0176] Table 15 shows the effective focal length of the optical imaging lens, the effective focal length of each lens, and half of the maximum field of view (Semi-FOV) of the optical imaging lens according to Examples 1 to 4.

[0177] Table 15

[0178] Parameters / Example one two three Four Semi-FOV(°) 52.09 49.72 52.95 52.46 f(mm) 3.32 3.31 3.31 3.31 f1(mm) -12.86 -12.87 -11.44 -17.06 f2(mm) 64.84 -2385.25 -186.58 -30.04 f3(mm) 3.45 3.45 2.69 2.63 f4(mm) -8.89 -9.67 -6.86 -6.91 f5(mm) 4.73 4.56 6.03 6.47 f6(mm) -9.13 -8.72 -8.86 -11.34

[0179] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0180] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0181] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0182] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0183] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group and a spacer assembly arranged in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. Among them, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The spacer assembly includes a fourth spacer placed between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens, and a fifth spacer placed between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; the number of spacers between the fourth lens and the fifth lens is one or more, and the number of spacers between the fifth lens and the sixth lens is one or more. The maximum axial height L of the lens barrel, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 4.20 < L / (T45 + T56) < 4.95; the effective focal length f5 of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 1.15 < f5 / d5s < 1.65; the spacer distance EP45 on the optical axis from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 7.00 < (D5s - d4s) / EP45 < 11.

90.

2. The optical imaging lens according to claim 1, wherein: The object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex, and the image side surface of the third lens is convex; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex.

3. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a first spacer placed between the first lens and the second lens and at least partially contacting the image side surface of the first lens. The effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer satisfy: -6.80 < f1 / d1s < -4.45; the effective focal length f6 of the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -2.75 < f^6 / d5s < -2.

25.

4. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a first spacer placed between the first lens and the second lens and at least partially contacting the image side surface of the first lens. The effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 3.85 < f1 / R1 < 5.05; the central thickness CT1 of the first lens on the optical axis and the interval distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer satisfy: 2.10 < EP01 / CT1 < 3.

20.

5. The optical imaging lens according to claim 1, the inner diameter d5mn of the image side surface of the spacer closest to the image side between the fifth lens and the sixth lens and the inner diameter d5s of the object side surface of the fifth spacer satisfy: 1.25 < d5mn / d5s < 1.

40.

6. The optical imaging lens according to claim 5, wherein: The curvature radius R10 of the image side surface of the fifth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 9.40 < (R10 - R11) / (R10 + R11) < 22.

35.

7. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens. The interval distance EP34 on the optical axis from the image side surface of the third spacer to the object side surface of the fourth spacer, the maximum axial thickness CP4 of the fourth spacer, and the air gap T45 on the optical axis between the fourth lens and the fifth lens satisfy: 0.90 < (EP34 + CP4) / T45 < 1.

60.

8. The optical imaging lens according to claim 1, wherein: The sum ∑CP5 of the maximum axial thicknesses of all spacers between the fifth lens and the sixth lens and the air gap T56 on the optical axis between the fifth lens and the sixth lens satisfy: 0.75 < ∑CP5 / T56 < 1.

45.

9. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a first spacer disposed between the first lens and the second lens and at least partially contacting the image side surface of the first lens, a second spacer disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens. The inner diameter d1m of the image side surface of the first spacer and the inner diameter d2s of the object side surface of the second spacer satisfy: 1.30 < d1m / d2s < 1.5; the inner diameter d3s of the object side surface of the third spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 1.20 < d3s / d2m < 1.

70.

10. The optical imaging lens according to claim 1, wherein: The spacer assembly further includes a second spacer disposed between the second lens and the third lens and at least partially contacting the image side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens. The distance EP23 between the image side surface of the second spacer and the object side surface of the third spacer on the optical axis, the maximum axial thickness CP3 of the third spacer, and the center thickness CT3 of the third lens on the optical axis satisfy the following conditions: 0.85<(EP23+CP3) / CT3<1.30; the air gap T23 between the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacer satisfy the following conditions: 18.40 <T23 / CP2<27.95。

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