Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, an imaging lens group and a spacing element group, the imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the spacing element group comprises a first spacing element arranged on the image side surface of the first lens; the optical imaging lens satisfies the following conditions: 68.00 degree lt; the method comprises the following steps: carrying out half-FOVlt; the angle is 71.45 degrees, and the angle is 5.35 lt; l / f * tan (Semi-FOV) lt; 6.80, 0.45 lt, 6.80, 0.45 lt; (D1s-d1s) / R2lt; the Semi-FOV is half of the maximum field angle of the optical imaging lens, the L is the length of the lens barrel in the direction of the optical axis, the f is the total effective focal length of the optical imaging lens, the R2 is the curvature radius of the image side surface of the first lens, the d1s is the inner diameter of the object side surface of the first spacing element, and the D1s is the outer diameter of the object side surface of the first spacing element.

Description

Technical Field

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

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical imaging lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical imaging lenses varies. Six-piece optical imaging lenses have become the mainstream and are widely used in fields such as mobile phones, virtual reality technology, augmented reality technology, and machine vision technology.

[0003] For a six-piece optical imaging lens, it is usually necessary to reasonably design the structure of the lens to enable the optical imaging lens to achieve the characteristics of wide angle and miniaturization. However, a miniaturized six-piece wide-angle lens is prone to stray light problems. For example, the first lens diverges light, and when the deflection angle of the light emitted from the first lens is unreasonable, stray light is easily generated, thereby affecting the imaging quality of the optical imaging lens. Summary of the Invention

[0004] One aspect of the present disclosure provides such an optical imaging lens, which includes a lens barrel, an imaging lens group, and a spacer element group disposed in the lens barrel. The imaging lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The spacer element group includes a first spacer element, and the first spacer element is disposed on and in contact with the image side surface of the first lens. Among them, the number of lenses with optical power in the optical imaging lens is six. Half of the maximum field of view Semi-FOV of the optical imaging lens satisfies: 68.00° < Semi-FOV < 71.45°; the length L of the lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens, and half of the maximum field of view Semi-FOV of the optical imaging lens satisfy: 5.35 < L / f × tan(Semi-FOV) < 6.80; the radius of curvature R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the outer diameter D1s of the object side surface of the first spacer element satisfy: 0.45 < (D1s - d1s) / R2 < 1.10.

[0005] According to an exemplary embodiment of the present disclosure, the effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the optical axis, and the inner diameter d1s of the object side surface of the first spacer element satisfy: -10.10mm -1 < f1 / CT1 / d1s ≤ -8.60mm -1 .

[0006] According to an exemplary embodiment of the present disclosure, the sum of the length L of the lens barrel in the direction of the optical axis and the center thickness ΣCT of each lens of the first lens to the sixth lens on the optical axis satisfies: 1.60 <L / ∑CT<1.90。

[0007] According to an exemplary embodiment of the present disclosure, the outer diameter D0s of the object side end surface of the lens barrel and the outer diameter D0m of the image side end surface of the lens barrel satisfy the following relationship: 1.25 <D0m / D0s<1.60。

[0008] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element, which is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. The curvature radius R4 of the image side surface of the second lens, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: -2.70<(d2s+d2m) / R4≤-1.60.

[0009] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element, which is disposed on the image side surface of the second lens and contacts the image side surface of the second lens. The inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 0.45<(D1m-d1s) / d2s<1.40.

[0010] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element, which is disposed on the image side of the second lens and in contact with the image side of the second lens. The spacing distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer element satisfy: 0.15 <T23 / CP2<4.95。

[0011] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element, which is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. The distance EP12 between the first spacer element and the second spacer element along the optical axis, the outer diameter D2s of the object side surface of the second spacer element, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.50 <D2s / (EP12+CT2)<5.90。

[0012] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is placed on the image side surface of the second lens and contacts the image side surface of the second lens, and the third spacer element is placed on the image side surface of the third lens and contacts the image side surface of the third lens. Wherein, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.10<(R5+R6) / (R5-R6)<0.35; the distance EP23 between the second spacer element and the third spacer element along the optical axis and the effective focal length f3 of the third lens satisfy: 0.10 <EP23 / f3<0.30。

[0013] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a third spacer element, which is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -1.71≤f1 / f3<-1.50; the inner diameter d1m of the image side surface of the first spacer element and the inner diameter d3m of the image side surface of the third spacer element satisfy: 0.60≤d1m / d3m<1.00.

[0014] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a third spacer element, which is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. The curvature radius R6 of the image side surface of the third lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: -1.45 <d3m / R6<-0.80。

[0015] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens. The inner diameter d2s of the object side surface of the second spacer element and the inner diameter d3s of the object side surface of the third spacer element satisfy: 0.65 <d2s / d3s≤1.15。

[0016] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a second spacer element, a third spacer element and a fourth spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and the fourth spacer element is disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens. Wherein, the distance EP23 between the second spacer element and the third spacer element along the optical axis, the distance EP34 between the third spacer element and the fourth spacer element along the optical axis, and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.10≤(EP23+EP34) / f34≤0.35.

[0017] According to an exemplary embodiment of the present disclosure, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens. Wherein, the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis, the maximum thickness CP5 of the fifth spacer element, and the effective focal length f6 of the sixth lens satisfy: -6.50≤f6 / (EP45+CP5)<-2.55.

[0018] According to an exemplary embodiment of the present disclosure, the first lens has negative optical power, and its image side surface is concave. The object side surface of the second lens is concave, and the image side surface is convex. The third lens has positive optical power, and its object side surface is convex, and the image side surface is convex. The fourth lens has negative optical power, and its object side surface is convex, and the image side surface is concave. The fifth lens has positive optical power, and its object side surface is convex, and the image side surface is convex. The sixth lens has positive optical power, and its object side surface is concave.

[0019] The optical imaging lens provided by the present disclosure uses six lenses. By controlling the relationship between half of the maximum field of view angle of the optical imaging lens and the maximum length of the lens barrel in the direction of the optical axis and the total effective focal length of the optical imaging lens, the optical imaging lens can achieve wide-angle and miniaturized characteristics. However, miniaturized wide-angle lenses are prone to stray light problems. For example, when the deflection angle of the light emitted from the first lens is unreasonable, stray light is easily generated. Therefore, by controlling the relationship between the inner diameter and the outer diameter of the object side of the first spacing element and the curvature radius of the image side of the first lens, the angle of the light emitted from the first lens can be within a reasonable range, and the first spacing element can effectively block stray light, reduce the stray light of the optical imaging lens, and improve the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present disclosure will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which: Figure 1 A parameter annotation diagram of an optical imaging lens according to an embodiment of the present disclosure is shown; Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present disclosure is shown; Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present disclosure is shown; Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present disclosure is shown; Figure 5The figure shows a magnification chromatic aberration curve, an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens according to Embodiment 1, 2, or 3 of the present disclosure; Figure 6 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present disclosure is shown; Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present disclosure is shown; Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present disclosure is shown; Fig. 9 The figure shows a magnification chromatic aberration curve, an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens according to Embodiment 4, 5, or 6 of the present disclosure; Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present disclosure is shown; Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present disclosure is shown; Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present disclosure is shown; Fig.13 The figure shows a magnification chromatic aberration curve, an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens according to Embodiment 7, 8, or 9 of the present disclosure; Fig.14 and Fig.15 The optical path diagram and stray light simulation diagram of the optical imaging lens satisfying Semi-FOV=70°, L / f×tan(Semi-FOV)=6, (D1s-d1s) / R2=0.25 are shown respectively; Fig.16 and Fig.17 The optical path diagram and stray light simulation diagram of the optical imaging lens satisfying Semi-FOV=70°, L / f×tan(Semi-FOV)=6, (D1s-d1s) / R2=1.46 are shown respectively; Fig.18 and Fig.19 The optical path diagram and stray light simulation diagram of the optical imaging lens satisfying Semi-FOV=70°, L / f×tan(Semi-FOV)=6, (D1s-d1s) / R2=0.63 are shown respectively; Fig. 20 and Fig.21 The optical path diagram and stray light simulation diagram of the optical imaging lens satisfying Semi-FOV=70°, L / f×tan(Semi-FOV)=6, and (D1s-d1s) / R2=0.86 are shown respectively. DETAILED DESCRIPTION

[0021] In order to better understand the present disclosure, a more detailed description will be made of various aspects of the present disclosure with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present disclosure, and do not limit the scope of the present disclosure in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0022] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present disclosure, the first lens discussed below may also be referred to as the second lens or the third lens.

[0023] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0024] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the image plane is called the image side of the lens.

[0025] It should also be understood that the terms "including" and / or "having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing embodiments of the present disclosure, the term "may" is used to mean "one or more embodiments of the present disclosure". And, the term "exemplary" is intended to refer to an example or illustration.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this document.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] For a six-piece wide-angle lens, by controlling the relationship between half of the maximum field of view angle of the optical imaging lens, the maximum length of the lens barrel in the direction of the optical axis, and the total effective focal length of the optical imaging lens, a compact design of the optical imaging lens can be achieved. However, in a compact wide-angle lens, there is an easy problem of stray light. For example, the first lens diverges light, and when the deflection angle of the light emitted from the first lens is unreasonable, stray light is easily generated, thereby affecting the imaging quality of the optical imaging lens.

[0029] In a first aspect of the present disclosure, there is provided such an optical imaging lens. The optical imaging lens may include a lens barrel, an imaging lens group, and a spacer element group disposed within the lens barrel. The imaging lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The number of lenses having optical power in the optical imaging lens is six. The spacer element group may include a first spacer element, and the first spacer element may be disposed on the image side surface of the first lens and at least partially in contact with the image side surface of the first lens. Half of the maximum field of view angle Semi-FOV of the optical imaging lens may satisfy: 68.00° < Semi-FOV < 71.45°; the length L of the lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens, and half of the maximum field of view angle Semi-FOV of the optical imaging lens may satisfy: 5.35 < L / f × tan(Semi-FOV) < 6.80. By controlling the relationship between half of the maximum field of view angle of the optical imaging lens and its relationship with the maximum length of the lens barrel in the direction of the optical axis and the total effective focal length of the optical imaging lens, the characteristics of wide angle and miniaturization of the optical imaging lens can be achieved.

[0030] In some embodiments, the radius of curvature R2 of the image side surface of the first lens, the inner diameter d1s and the outer diameter D1s of the object side surface of the first spacer element may satisfy: 0.45 < (D1s - d1s) / R2 < 1.10. By controlling the relationship between the inner diameter and outer diameter of the object side surface of the first spacer element and the radius of curvature of the image side surface of the first lens, the angle of the light emitted from the first lens can be within a reasonable range, and the first spacer element can effectively block stray light, reduce the stray light of the optical imaging lens, and improve the imaging quality of the optical imaging lens.

[0031] The following will describe the imaging effect of the optical imaging lens in conjunction with Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 and Fig.21 to describe the imaging effect of the optical imaging lens. Fig.14 and Fig.15They are respectively the optical path diagram and the stray light simulation diagram of the optical imaging lens satisfying Semi-FOV = 70°, L / f×tan(Semi-FOV) = 6, and (D1s - d1s) / R2 = 0.25. Fig.16 and Fig.17 They are respectively the optical path diagram and the stray light simulation diagram of the optical imaging lens satisfying Semi-FOV = 70°, L / f×tan(Semi-FOV) = 6, and (D1s - d1s) / R2 = 1.46. Fig.18 and Fig.19 They are respectively the optical path diagram and the stray light simulation diagram of the optical imaging lens satisfying Semi-FOV = 70°, L / f×tan(Semi-FOV) = 6, and (D1s - d1s) / R2 = 0.63. Fig. 20 and Fig.21 They are respectively the optical path diagram and the stray light simulation diagram of the optical imaging lens satisfying Semi-FOV = 70°, L / f×tan(Semi-FOV) = 6, and (D1s - d1s) / R2 = 0.86.

[0032] From Fig.14 and Fig.15 it can be seen that when the optical imaging lens satisfies (D1s - d1s) / R2 = 0.25, the first lens generates internal reflection stray light, and the internal reflection stray light generated by the first lens cannot be effectively blocked by the first spacer element, resulting in an increase in the stray light of the optical imaging lens. From Fig.16 and Fig.17 it can be seen that when the optical imaging lens satisfies (D1s - d1s) / R2 = 1.46, the first spacer element cannot effectively intercept the stray light emitted from the first lens, resulting in an increase in the stray light of the optical imaging lens. However, when the optical imaging lens satisfies (D1s - d1s) / R2 = 0.63, the first spacer element can effectively block the internal reflection stray light generated by the first lens, and the stray light of the optical imaging lens is significantly reduced (as shown in Fig.18 and Fig.19 ); when the optical imaging lens satisfies (D1s - d1s) / R2 = 0.86, the first spacer element can effectively block the stray light emitted from the first lens, and the stray light of the optical imaging lens is significantly reduced (as shown in Fig. 20 and Fig.21 ). It can be seen that by controlling the optical imaging lens to satisfy "68.00° < Semi-FOV < 71.45°, 5.35 < L / f×tan(Semi-FOV) < 6.80, 0.45 < (D1s - d1s) / R2 < 1.10", while the optical imaging lens realizes the characteristics of wide angle and miniaturization, the stray light can be reduced.

[0033] In an exemplary embodiment, between the first lens and the sixth lens, there may be a spacing distance between any two adjacent lenses, such as an air gap.

[0034] In an exemplary embodiment, the optical imaging lens may further include a diaphragm. The diaphragm may be disposed between the second lens and the third lens.

[0035] In an exemplary embodiment, the spacer element group may include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. Reasonable use of the spacer elements can effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the optical imaging lens.

[0036] In an exemplary embodiment, the lens barrel may include an object-side end face, an image-side end face, an outer ring face, and an inner ring face. Among them, the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in the direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer ring face, and the surface of the lens barrel closest to the optical axis is the inner ring face.

[0037] In an exemplary embodiment, the spacer element group may include a first spacer element, and the first spacer element may be placed on the image side surface of the first lens and at least partially in contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the central thickness CT1 of the first lens on the optical axis, and the inner diameter d1s of the object side surface of the first spacer element may satisfy: -10.10mm -1 <f1 / CT1 / d1s ≤ -8.60mm -1 By controlling the relationship among the effective focal length of the first lens, the central thickness of the first lens on the optical axis, and the inner diameter of the object side surface of the first spacer element, the angle of the outgoing light of the first lens can be within a reasonable range, and the first spacer element can effectively block stray light, reduce the stray light of the optical imaging lens, and improve the imaging quality of the optical imaging lens.

[0038] In an exemplary embodiment, the length L of the lens barrel in the direction of the optical axis and the sum ∑CT of the central thicknesses of each lens from the first lens to the sixth lens on the optical axis may satisfy: 1.60 < L / ∑CT < 1.90. By controlling the ratio of the length of the lens barrel in the direction of the optical axis to the sum of the central thicknesses of each lens from the first lens to the sixth lens on the optical axis, the overall size of the optical imaging lens can be restricted, so that the size of the optical imaging lens is within a reasonable range, and the maximum outer shape of the optical imaging lens can be better controlled, improving the assembly stability of the optical imaging lens.

[0039] In an exemplary embodiment, the outer diameter D0s of the object-side end face of the lens barrel and the outer diameter D0m of the image-side end face of the lens barrel may satisfy: 1.25 < D0m / D0s < 1.60. By controlling the ratio of the outer diameters of the image-side end face and the object-side end face of the lens barrel, the head size of the optical imaging lens can be constrained within a reasonable range, and the overall wall thickness of the lens barrel can be made relatively uniform, improving the structural stability of the lens barrel, and further improving the assembly stability and reliability of the optical imaging lens.

[0040] In some embodiments, the spacer element group may include a second spacer element, and the second spacer element may be disposed on the image side face of the second lens and at least partially in contact with the image side face of the second lens. The radius of curvature R4 of the image side face of the second lens, the inner diameter d2s of the object side face of the second spacer element, and the inner diameter d2m of the image side face of the second spacer element may satisfy: -2.70 < (d2s + d2m) / R4 ≤ -1.60. By controlling the ratio of the sum of the inner diameters of the object side face and the image side face of the second spacer element to the radius of curvature of the image side face of the second lens, the angle of the outgoing light of the second lens can be within a reasonable range, and the second spacer element can effectively block excess stray light, improving the imaging quality of the optical imaging lens. In addition, the number of light rays entering the third lens can be controlled, so that the optical imaging lens has a reasonable relative illumination.

[0041] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side face of the first lens and at least partially in contact with the image side face of the first lens, and the second spacer element may be disposed on the image side face of the second lens and at least partially in contact with the image side face of the second lens. The inner diameter d1s of the object side face of the first spacer element, the outer diameter D1m of the image side face of the first spacer element, and the inner diameter d2s of the object side face of the second spacer element may satisfy: 0.45 < (D1m - d1s) / d2s < 1.40. By controlling the above conditional expression, the inner diameter of the object side face and the outer diameter of the image side face of the first spacer element can be constrained within a reasonable range, that is, the size of the first spacer element is controlled so that the first spacer element can effectively block the stray light generated by the first lens; at the same time, by cooperating with restricting the inner diameter of the object side face of the second spacer element, the stray light caused by the marginal rays at the second lens can be reduced, improving the imaging quality of the optical imaging lens.

[0042] In an exemplary embodiment, the spacer element group may include a second spacer element, which may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The spacing distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer element may satisfy: 0.15 < T23 / CP2 < 4.95. By controlling the above conditional expression, the maximum thickness of the second spacer element can be constrained within a reasonable range, improving the assembly stability of the second lens and the third lens and the assembly yield of the optical imaging lens; at the same time, by cooperating with restricting the spacing distance between the second lens and the third lens on the optical axis, the sensitivity of the second lens and the third lens in a high-temperature and high-humidity environment can be reduced, improving the reliability of the optical imaging lens.

[0043] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens, and the second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. Among them, the distance EP12 between the first spacer element and the second spacer element along the optical axis, the outer diameter D2s of the object side of the second spacer element, and the central thickness CT2 of the second lens on the optical axis may satisfy: 4.50 < D2s / (EP12 + CT2) < 5.90. By controlling the above conditional expression, the edge thickness and the central thickness of the second lens can be constrained within a reasonable range, improving the forming feasibility of the second lens; at the same time, by cooperating with restricting the outer diameter of the object side of the second spacer element, the minimum outer diameter of the third lens can be constrained, ensuring that the abutting length between the third lens and the second lens is within a reasonable range and improving the assembly stability of the optical imaging lens.

[0044] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens may satisfy: 0.10 < (R5 + R6) / (R5 - R6) < 0.35; the distance EP23 along the optical axis between the second spacer element and the third spacer element and the effective focal length f3 of the third lens may satisfy: 0.10 < EP23 / f3 < 0.30. By controlling the above conditional expressions, the radii of curvature of the object side and the image side of the third lens can be constrained, that is, the overall shape of the third lens can be constrained, so that the third lens has good thickness uniformity and improves the forming feasibility of the third lens; at the same time, by restricting the distance along the optical axis between the second spacer element and the third spacer element and the effective focal length of the third lens, the angle of the outgoing light rays at the edge of the third lens can be within a reasonable range, and the stray light generated by the reflection of the outgoing light rays at a large angle by the inner ring surface of the third spacer element can be minimized as much as possible, thereby improving the imaging quality of the optical imaging lens.

[0045] In an exemplary embodiment, the spacer element group may include a first spacer element and a third spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: -1.71 ≤ f1 / f3 < -1.50; the inner diameter d1m of the image side of the first spacer element and the inner diameter d3m of the image side of the third spacer element may satisfy: 0.60 ≤ d1m / d3m < 1.00. By controlling the above conditional expressions, the angles of the outgoing light rays of the first lens and the third lens can be within a reasonable range, and the first spacer element and the third spacer element can block the non-imaging light rays, minimizing the stray light generated by the direct passage of the non-imaging light rays as much as possible, thereby improving the imaging quality of the optical imaging lens.

[0046] In an exemplary embodiment, the spacer element group may include a third spacer element, which may be placed on the image side of the third lens and at least partially in contact with the image side of the third lens. The radius of curvature R6 of the image side of the third lens and the inner diameter d3m of the image side of the third spacer element may satisfy: -1.45 < d3m / R6 < -0.80. By controlling the radius of curvature of the image side of the third lens to control the optical power of the third lens, the angle of the outgoing light rays at the edge of the third lens can be made to be within a reasonable range; at the same time, in conjunction with restricting the inner diameter of the image side of the third spacer element, the light rays entering the fourth lens can be controlled. For example, the third spacer element effectively blocks non-imaging light rays, reduces the stray light of the optical imaging lens, and improves the imaging quality of the optical imaging lens.

[0047] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be placed on the image side of the second lens and at least partially in contact with the image side of the second lens, and the third spacer element may be placed on the image side of the third lens and at least partially in contact with the image side of the third lens. The inner diameter d2s of the object side of the second spacer element and the inner diameter d3s of the object side of the third spacer element may satisfy: 0.65 < d2s / d3s ≤ 1.15. The inner diameter of the object side of the second spacer element is related to the aperture of the diaphragm. For example, the inner diameter of the object side of the second spacer element is the aperture of the diaphragm. By controlling the inner diameter of the object side of the second spacer element, the aperture of the diaphragm can be restricted, effectively controlling the aperture of the optical imaging lens; at the same time, in conjunction with the inner diameter of the object side of the third spacer element, the third spacer element can block non-imaging light rays, reduce the stray light of the optical imaging lens, and improve the imaging quality of the optical imaging lens.

[0048] In an exemplary embodiment, the spacer element group may include a second spacer element, a third spacer element, and a fourth spacer element. The second spacer element may be placed on the image side of the second lens and at least partially in contact with the image side of the second lens, the third spacer element may be placed on the image side of the third lens and at least partially in contact with the image side of the third lens, and the fourth spacer element may be placed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The distance EP23 along the optical axis between the second spacer element and the third spacer element and the distance EP34 along the optical axis between the third spacer element and the fourth spacer element and the combined focal length f34 of the third lens and the fourth lens may satisfy: 0.10 ≤ (EP23 + EP34) / f34 ≤ 0.35. By controlling the above conditional expression, the edge thicknesses of the third lens and the fourth lens can be restricted within a reasonable range, such that the thickness ratio of the third lens and the fourth lens meets the requirements; at the same time, in conjunction with restricting the combined focal length of the third lens and the fourth lens, the concavity and convexity of the surfaces of these two lenses can be controlled, reducing the forming and demolding difficulties of these two lenses and improving the forming yield of these two lenses.

[0049] In an exemplary embodiment, the spacer element group may include a fourth spacer element and a fifth spacer element, the fourth spacer element may be placed on the image side of the fourth lens and at least partially contact the image side of the fourth lens, and the fifth spacer element may be placed on the image side of the fifth lens and at least partially contact the image side of the fifth lens. The distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis, the maximum thickness CP5 of the fifth spacer element and the effective focal length f6 of the sixth lens may satisfy: -6.50≤f6 / (EP45+CP5)<-2.55. By controlling the above conditional expression, the thickness ratio of the fifth lens can be constrained, the molding difficulty of the fifth lens can be reduced, and the size and surface stability of the fifth lens can be guaranteed, thereby improving the reliability of the optical imaging lens; at the same time, by limiting the effective focal length of the sixth lens, the reasonable distribution of the optical focal length can be achieved, and the angle of the outgoing light of the sixth lens can be effectively controlled, so that the image size of the optical imaging lens matches the rear chip.

[0050] According to the above-mentioned embodiment of the present disclosure, the optical imaging lens can use six lenses and at least one spacer element. By reasonably allocating the parameters of each lens, each spacer element and the lens barrel, the optical imaging lens can achieve wide-angle and miniaturization characteristics, reduce stray light of the optical imaging lens, and improve the imaging quality and assembly stability of the optical imaging lens.

[0051] In an embodiment of the present disclosure, at least one of the surfaces of each lens from the first lens to the sixth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0052] It should be understood that the present disclosure is concerned with the performance optimization of a miniaturized six-piece wide-angle lens. Specifically, the present disclosure is concerned with how to overcome stray light problems or assembly stability problems caused by, for example, achieving miniaturization and wide-angle characteristics. The stray light problem may be, for example, a stray light problem generated by the first lens, or a stray light problem generated by the second lens, or a stray light problem generated by the third lens, or a stray light problem generated by the fourth lens, or a stray light problem generated by the fifth lens. The specific focal length distribution of the six lenses and the surface configuration of each lens are not the focus of the present disclosure, and these configurations can be adjusted accordingly as needed. That is, although several specific focal length distributions and surface configurations are shown for the imaging lens group in the embodiments of the present disclosure, it should be understood that these embodiments are merely exemplary, and the imaging lens group in the present disclosure should not be limited to the several specific cases shown in the embodiments, but should be broadly understood as a six-piece imaging lens group with miniaturization and wide-angle characteristics.

[0053] A second aspect of the present disclosure provides an optical imaging lens, which may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a first spacer element and a second spacer element, the first spacer element may be placed on the image side of the first lens and in contact with the image side of the first lens, and the second spacer element may be placed on the image side of the second lens and in contact with the image side of the second lens. The number of lenses having optical power in the optical imaging lens is six.

[0054] Half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfies: 68.00° < Semi-FOV < 71.45°; the length L of the lens barrel in the direction of the optical axis and the sum ∑CT of the central thicknesses of each lens from the first lens to the sixth lens on the optical axis satisfy: 1.60 < L / ∑CT < 1.90; the inner diameter d1s of the object side of the first spacer element, the outer diameter D1m of the image side of the first spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy: 0.45 < (D1m - d1s) / d2s < 1.40. By controlling the Semi-FOV and L / ∑CT, the optical imaging lens can achieve the characteristics of wide angle and miniaturization. However, a miniaturized wide-angle lens is prone to stray light problems. For example, the first lens and the second lens are prone to generate stray light. Therefore, by controlling (D1m - d1s) / d2s within a reasonable range, the inner diameter of the object side and the outer diameter of the image side of the first spacer element can be restricted, that is, the size of the first spacer element can be controlled so that the first spacer element can effectively block the stray light generated by the first lens; at the same time, by cooperating with restricting the inner diameter of the object side of the second spacer element, the stray light caused by the marginal rays at the second lens can be reduced, and the imaging quality of the optical imaging lens can be improved.

[0055] Those skilled in the art should understand that without departing from the technical solutions claimed in the present disclosure, the number of lenses and spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0056] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0057] Embodiment 1

[0058] The following refers to Figure 2 Describe the optical imaging lens according to Embodiment 1 of the present disclosure.

[0059] As Figure 2 shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may sequentially include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 along the optical axis from the object side to the image side. An aperture STO (not shown) may be disposed between the second lens E2 and the third lens E3.

[0060] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. In the example, an optical element may be further provided on the image side of the sixth lens E6, and the optical element may be, for example, a filter, and the optical element has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15 (not shown).

[0061] The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. In an example, the spacer element group may also include a second auxiliary spacer element P2b, a third auxiliary spacer element P3b, and a fifth auxiliary spacer element P5b, wherein the second auxiliary spacer element P2b is disposed on the image side surface of the second spacer element P2 and is at least partially in contact with the image side surface of the second spacer element P2, the third auxiliary spacer element P3b is disposed on the image side surface of the third spacer element P3 and is at least partially in contact with the image side surface of the third spacer element P3, and the fifth auxiliary spacer element P5b is disposed on the image side surface of the fifth spacer element P5 and is at least partially in contact with the image side surface of the fifth spacer element P5. The spacer element may block excess light in the imaging process from entering the next lens, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0062] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0063] Table 1

[0064] In this embodiment, the total effective focal length f of the optical imaging lens is 2.32 mm, the half of the maximum field of view SemiFOV of the optical imaging lens is 69.41°, and the combined focal length f34 of the third lens and the fourth lens is 4.42 mm.

[0065] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by but not limited to the following aspherical surface formula: (1) Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric surface S1-S12 in Example 1.

[0066] Table 2

[0067] Example 2

[0068] The following reference Figure 3 An optical imaging lens according to Embodiment 2 of the present disclosure is described.

[0069] like Figure 3 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. An optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3 and a fifth spacer element P5. In the example, the spacer element group may also include a second auxiliary spacer element P2b and a third auxiliary spacer element P3b. In the example, the spacer element group may also include a sixth spacer element P6, which is disposed on the image side of the sixth lens E6 and is in at least partial contact with the image side of the sixth lens E6.

[0070] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0071] Example 3

[0072] The following reference Figure 4 An optical imaging lens according to Embodiment 3 of the present disclosure is described.

[0073] like Figure 4As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. An optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3 and a fifth spacer element P5. In the example, the spacer element group may also include a second auxiliary spacer element P2b and a third auxiliary spacer element P3b. In the example, the spacer element group may also include a sixth spacer element P6, which is disposed on the image side of the sixth lens E6 and is in at least partial contact with the image side of the sixth lens E6.

[0074] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0075] Figure 5 Figure a shows the magnification chromatic aberration curve of the optical imaging lens of Example 1, 2 or 3, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 5 Figure b shows the axial chromatic aberration curve of the optical imaging lens of Example 1, 2 or 3, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging lens. Figure 5 Figure c in the figure shows the astigmatism curve of the optical imaging lens of Example 1, 2 or 3, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 5 Figure d in FIG. 1 shows the distortion curve of the optical imaging lens of Example 1, 2 or 3, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 5 It can be seen that the optical imaging lens of Example 1, 2 or 3 can achieve good imaging quality.

[0076] Example 4

[0077] The following reference Figure 6 An optical imaging lens according to Embodiment 4 of the present disclosure is described.

[0078] like Figure 6As shown, the optical imaging lens may include a lens barrel, an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3.

[0079] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. In the example, the image side of the sixth lens E6 may also be provided with an optical element, and the optical element may be, for example, a filter, and the optical element has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15 (not shown).

[0080] The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. In an example, the spacer element group may also include a second auxiliary spacer element P2b, a third auxiliary spacer element P3b, and a fifth auxiliary spacer element P5b, wherein the second auxiliary spacer element P2b is disposed on the image side surface of the second spacer element P2 and is at least partially in contact with the image side surface of the second spacer element P2, the third auxiliary spacer element P3b is disposed on the image side surface of the third spacer element P3 and is at least partially in contact with the image side surface of the third spacer element P3, and the fifth auxiliary spacer element P5b is disposed on the image side surface of the fifth spacer element P5 and is at least partially in contact with the image side surface of the fifth spacer element P5. The spacer element may block excess light in the imaging process from entering the next lens, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0081] Table 3 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0082] Table 3

[0083] In this embodiment, the total effective focal length f of the optical imaging lens is 2.32 mm, the half of the maximum field of view SemiFOV of the optical imaging lens is 68.04°, and the combined focal length f34 of the third lens and the fourth lens is 3.60 mm.

[0084] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface S1-S12 in Example 4.

[0085] Table 4

[0086] Example 5

[0087] The following reference Figure 7 An optical imaging lens according to Embodiment 5 of the present disclosure is described.

[0088] like Figure 7 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. In the example, an optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. In the example, the spacer element group may also include a fifth auxiliary spacer element P5b.

[0089] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0090] Example 6

[0091] The following reference Figure 8 An optical imaging lens according to Embodiment 6 of the present disclosure is described.

[0092] like Figure 8As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. In the example, an optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. In the example, the spacer element group may also include a fifth auxiliary spacer element P5b.

[0093] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0094] Fig. 9 Figure a shows the magnification chromatic aberration curve of the optical imaging lens of Example 4, 5 or 6, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Fig. 9 Figure b shows the axial chromatic aberration curve of the optical imaging lens of Example 4, 5 or 6, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging lens. Fig. 9 Figure c in the figure shows the astigmatism curve of the optical imaging lens of Example 4, 5 or 6, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 9 Figure d in FIG. 1 shows the distortion curve of the optical imaging lens of Example 4, 5 or 6, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig. 9 It can be seen that the optical imaging lens of Example 4, 5 or 6 can achieve good imaging quality.

[0095] Example 7

[0096] The following reference Fig.10 An optical imaging lens according to Embodiment 7 of the present disclosure is described.

[0097] like Fig.10 As shown, the optical imaging lens may include a lens barrel, an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in order from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3.

[0098] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. In the example, an optical element may be further provided on the image side of the sixth lens E6, and the optical element may be, for example, a filter, and the optical element has an object side surface S13 (not shown) and an image side surface S14 (not shown). Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15 (not shown).

[0099] The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. In an example, the spacer element group may also include a second auxiliary spacer element P2b and a fifth auxiliary spacer element P5b, wherein the second auxiliary spacer element P2b is disposed on the image side surface of the second spacer element P2 and is at least partially in contact with the image side surface of the second spacer element P2, and the fifth auxiliary spacer element P5b is disposed on the image side surface of the fifth spacer element P5 and is at least partially in contact with the image side surface of the fifth spacer element P5. The spacer element may block excess light in the imaging process from entering the next lens, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

[0100] Table 5 shows the basic parameters of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0101] Table 5

[0102] In this embodiment, the total effective focal length f of the optical imaging lens is 2.30 mm, the half of the maximum field of view SemiFOV of the optical imaging lens is 71.44°, and the combined focal length f34 of the third lens and the fourth lens is 4.38 mm.

[0103] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface S1-S12 in Example 7.

[0104] Table 6

[0105] Example 8

[0106] The following reference Fig.11 An optical imaging lens according to Example 8 of the present disclosure is described.

[0107] like Fig.11 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. In the example, an optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. In the example, the spacer element group may also include a second auxiliary spacer element P2b and a fifth auxiliary spacer element P5b.

[0108] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0109] Example 9

[0110] The following reference Fig.12 An optical imaging lens according to Embodiment 9 of the present disclosure is described.

[0111] like Fig.12 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed in the lens barrel. The imaging lens group may include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 in sequence from the object side to the image side along the optical axis. A stop STO (not shown) may be disposed between the second lens E2 and the third lens E3. In the example, an optical element may also be disposed on the image side of the sixth lens E6, and the optical element may be, for example, a filter. The spacer element group may include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. In the example, the spacer element group may also include a second auxiliary spacer element P2b and a fifth auxiliary spacer element P5b.

[0112] The structure of the imaging lens group of this embodiment is the same as that of the imaging lens group of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0113] Fig.13 Figure a shows the magnification chromatic aberration curve of the optical imaging lens of Example 7, 8 or 9, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Fig.13 Figure b shows the axial chromatic aberration curve of the optical imaging lens of Example 7, 8 or 9, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging lens. Fig.13 Figure c in the figure shows the astigmatism curve of the optical imaging lens of Example 7, 8 or 9, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.13 Figure d in FIG. 1 shows the distortion curve of the optical imaging lens of Example 7, 8 or 9, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.13 It can be seen that the optical imaging lens of Example 7, 8 or 9 can achieve good imaging quality.

[0114] Table 7 shows the values ​​of parameters such as d1s, d1m, D1s, D1m, d2s, d2m, D2s, d3s, d3m, D0s, D0m, EP12, CP2, EP23, EP34, EP45, CP5 and L in each of Examples 1 to 9. The above parameters can be calculated according to Figure 1 The units of the parameters listed in Table 7 are all mm.

[0115] Table 7

[0116] Table 8 shows the values ​​of the conditional expressions of each of Examples 1 to 9.

[0117] Table 8

[0118] The present disclosure also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0119] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present disclosure is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other.

Claims

1. An optical imaging lens, characterized in that: include: An imaging lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis; a spacer element group, comprising a first spacer element, wherein the first spacer element is disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; as well as a lens barrel, wherein the imaging lens group and the spacer element group are disposed in the lens barrel; Wherein, the number of lenses having optical power of the optical imaging lens is six; The Semi-FOV of the optical imaging lens satisfies half of the maximum field of view: 68.00° <Semi-FOV<71.45°; The length L of the lens barrel in the direction of the optical axis, the total effective focal length f of the optical imaging lens and half of the maximum field of view Semi-FOV of the optical imaging lens satisfy: 5.35 <L / f×tan(Semi-FOV)<6.80; The curvature radius R2 of the image-side surface of the first lens, the inner diameter d1s of the object-side surface of the first spacer element, and the outer diameter D1s of the object-side surface of the first spacer element satisfy: 0.45<(D1s-d1s) / R2<1.

10.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis and the inner diameter d1s of the object side surface of the first spacer element satisfy: -10.10 mm -1 <f1 / CT1 / d1s≤-8.60mm -1 .

3. The optical imaging lens according to claim 1, wherein: The sum of the length L of the lens barrel in the direction of the optical axis and the center thickness ΣCT of each lens from the first lens to the sixth lens on the optical axis satisfies: 1.60 <L / ∑CT<1.90。 4. The optical imaging lens according to claim 1, wherein: The outer diameter D0s of the object side end surface of the lens barrel and the outer diameter D0m of the image side end surface of the lens barrel satisfy: 1.25 <D0m / D0s<1.60。 5. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The curvature radius R4 of the image side surface of the second lens, the inner diameter d2s of the object side surface of the second spacing element, and the inner diameter d2m of the image side surface of the second spacing element satisfy: -2.70<(d2s+d2m) / R4≤-1.

60.

6. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The inner diameter d1s of the object-side surface of the first spacing element, the outer diameter D1m of the image-side surface of the first spacing element, and the inner diameter d2s of the object-side surface of the second spacing element satisfy: 0.45<(D1m-d1s) / d2s<1.

40.

7. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The spacing distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacing element satisfy: 0.15 <T23 / CP2<4.95。 8. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; The distance EP12 between the first spacing element and the second spacing element along the optical axis, the outer diameter D2s of the object side of the second spacing element and the center thickness CT2 of the second lens on the optical axis satisfy: 4.50 <D2s / (EP12+CT2)<5.90。 9. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; The curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.10<(R5+R6) / (R5-R6)<0.35; the distance EP23 between the second spacing element and the third spacing element along the optical axis and the effective focal length f3 of the third lens satisfy: 0.10 <EP23 / f3<0.30。 10. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a third spacer element, the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; Among them, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -1.71≤f1 / f3<-1.50; the inner diameter d1m of the image side surface of the first spacing element and the inner diameter d3m of the image side surface of the third spacing element satisfy: 0.60≤d1m / d3m<1.

00.

11. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a third spacer element, the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; The curvature radius R6 of the image side surface of the third lens and the inner diameter d3m of the image side surface of the third spacing element satisfy: -1.45 <d3m / R6<-0.80。 12. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element and a third spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, and the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; The inner diameter d2s of the object side surface of the second spacing element and the inner diameter d3s of the object side surface of the third spacing element satisfy: 0.65 <d2s / d3s≤1.15。 13. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further comprises a second spacer element, a third spacer element and a fourth spacer element, the second spacer element is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens, the third spacer element is disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and the fourth spacer element is disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; Among them, the distance EP23 between the second spacing element and the third spacing element along the optical axis, the distance EP34 between the third spacing element and the fourth spacing element along the optical axis, and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.10≤(EP23+EP34) / f34≤0.

35.

14. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The distance EP45 between the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element and the effective focal length f6 of the sixth lens satisfy: -6.50≤f6 / (EP45+CP5)<-2.

55.

15. The optical imaging lens according to any one of claims 1 to 4, wherein: The first lens has negative optical power, and its image side surface is concave; The object side surface of the second lens is concave, and the image side surface is convex; The third lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fourth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The fifth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; and The sixth lens has positive refractive power, and its object side surface is concave.

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