Motion camera lens

Abstract

The invention provides a motion camera lens. The motion camera lens is composed of eight lenses. The motion camera lens comprises a first group, a prism and a second group which are sequentially arranged from the object side to the image side. The lens of the motion camera meets the following conditions: 95 degrees < = Semi-FOVlt; 100 DEG C; 1.95 lt, 1.95 lt; dT11 / DT12lt, and DT11 / DT12lt; 2.15, 2.15; 0.50 lt, 0.50 lt; and d1s / (R1-R2) < = 0.75. The problem that in the prior art, a motion camera lens is poor in edge imaging performance in order to meet the requirement for the large field angle is solved.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to a motion camera lens. Background Technology

[0002] In recent years, action cameras have become increasingly popular among outdoor enthusiasts and professional photographers due to their portability and powerful shooting capabilities, especially in scenarios such as extreme sports, travel adventures, and everyday life documentation. As users' demands for shooting experiences continue to rise, particularly the strong need for wide field of view, the design of action camera lenses faces new challenges.

[0003] Currently, to meet the imaging requirements of a large field of view, when designing action camera lenses, there are situations where the effective diameter of the object-side surface of the first lens is much larger than the effective diameter of the image-side surface. In this case, large-angle incident light rays can enter the first lens. However, when the peripheral light rays exit through the image-side surface of the first lens, the difference between the exit angle and the incident angle is large. This causes a significant change in the refraction angle of the peripheral light rays at the object-side and image-side surfaces of the first lens, which in turn amplifies the difference in refractive index between different wavelengths of light. As a result, the chromatic aberration problem of the peripheral light rays exiting through the first lens is more obvious, affecting the edge imaging performance of the action camera lens.

[0004] In other words, existing action camera lenses suffer from poor edge imaging performance due to the need to meet the requirements of a large field of view. Summary of the Invention

[0005] The main objective of this invention is to provide a sports camera lens to solve the problem that existing sports camera lenses have poor edge imaging performance due to the need to meet the requirements of a large field of view.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a sports camera lens. The sports camera lens is composed of eight lenses. The sports camera lens includes a first group, a prism, and a second group arranged in sequence from the object side to the image side. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens. The first optical axis and the second optical axis are perpendicular to each other. Half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°. The effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfy: 1.95 < DT11 / DT12 < 2.15. The inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 0.50 < d1s / (R1 - R2) ≤ 0.75.

[0007] According to another aspect of the present invention, there is provided a sports camera lens. The sports camera lens is composed of eight lenses. The sports camera lens includes a first group, a prism, and a second group arranged in sequence from the object side to the image side. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens. The first optical axis and the second optical axis are perpendicular to each other. Half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°. The effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfy: 1.95 < DT11 / DT12 < 2.15. The inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f of the sports camera lens satisfy: -4.40 ≤ (d1s / D1s)×(f1 / f) ≤ -3.00.

[0008] According to another aspect of the present invention, a sports camera lens is provided. The sports camera lens consists of eight lenses and includes, from the object side to the image side, a first group, a prism, and a second group arranged in sequence; the first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens; the second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens; the first optical axis and the second optical axis are perpendicular to each other; half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°; between the effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens, it satisfies: 1.95 < DT11 / DT12 < 2.15; between the outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, the air gap T12 on the first optical axis between the image side surface of the first lens and the object side surface of the second lens, and the spacing distance T2Y on the first optical axis between the image side surface of the second lens and the incident surface of the prism, it satisfies: 1.85 ≤ (D1s - d1s) / (T12 + T2Y) < 2.45.

[0009] Further, the prism includes a prism incident surface, a prism reflection surface, and a prism exit surface. The angle between the prism incident surface and the prism exit surface is 90°, and the prism incident surface, the prism reflection surface, and the prism exit surface are all flat surfaces; between the spacing distance T2Y on the first optical axis between the image side surface of the second lens and the prism incident surface and the spacing distance TY3 on the second optical axis between the prism exit surface and the object side surface of the third lens, it satisfies: 6.00 ≤ T2Y / TY3 < 6.90.

[0010] Further, between the axial distance TD between the object side surface of the first lens and the image side surface of the eighth lens and the effective focal length f of the sports camera lens, it satisfies: 13.45 < TD / f < 14.05.

[0011] Further, between the inner diameter d1m of the image side surface of the first lens, the inner diameter d01m of the image side end surface of the first lens barrel, and the effective focal length f2 of the second lens, it satisfies: -0.85 ≤ (d1m - d01m) / f2 < 2.55.

[0012] Further, between the inner diameter d1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens, it satisfies: -1.20 < d1s / (f1 - f2) < -0.85.

[0013] Furthermore, the maximum height L1 of the first lens tube and the maximum height L2 of the second lens tube satisfy the following condition: 0.85 <L1 / L2<1.25。

[0014] Furthermore, the outer diameter D01s of the object-side end face of the first lens tube and the maximum height L2 of the second lens tube satisfy the following relationship: 3.35 <D01s / L2<3.60。

[0015] Furthermore, the second lens barrel includes an inner annular protrusion, which is disposed on a portion of the inner annular surface of the second lens barrel and protrudes in a direction close to the second optical axis. The inner annular protrusion has an object-side surface facing the object-side end face of the second lens barrel and an image-side surface facing the image-side end face of the second lens barrel. The inner diameter of the image-side surface of the inner annular protrusion is the minimum value of the inner diameter of the inner annular surface of the second lens barrel. The object-side surface of the inner annular protrusion contacts the image-side surface of the third lens, and the image-side surface of the inner annular protrusion contacts the object-side surface of the fourth lens.

[0016] Furthermore, the minimum inner diameter dQs of the inner annular protrusion, the effective diameter DT32 of the image-side surface of the third lens, and the effective diameter DT41 of the object-side surface of the fourth lens satisfy the following relationship: 1.85 <dQs / (DT32-DT41)<3.30。

[0017] Furthermore, the second group also includes a seventh spacer element, which is located on the object side of the eighth lens and in contact with the object side surface of the eighth lens; the inner diameter d7s of the object side surface of the seventh spacer element and the combined focal length f67 of the sixth and seventh lenses satisfy: -1.20 <d7s / f67≤-0.30。

[0018] Furthermore, the distance CPQ between the object-side surface of the inner annular protrusion and the image-side surface of the inner annular protrusion on the second optical axis, and the distance T34 between the image-side surface of the third lens and the object-side surface of the fourth lens on the second optical axis, satisfy the following condition: 0.90 <CPQ / T34<1.80。

[0019] Furthermore, the second group also includes a seventh spacer element, which is located on the object side of the eighth lens and in contact with the object side surface of the eighth lens; the radius of curvature R13 of the object side surface of the eighth lens, the inner diameter d7m of the image side surface of the seventh spacer element, and the outer diameter D7m of the image side surface of the seventh spacer element satisfy the following relationship: 3.10 <R13 / (D7m-d7m)<15.55。

[0020] Applying the technical solution of the present invention, the sports camera lens consists of eight lenses. The sports camera lens includes a first group, a prism, and a second group arranged in sequence from the object side to the image side; the first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens; the second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens; the first optical axis and the second optical axis are perpendicular to each other; half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°; the relationship between the effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfies: 1.95 < DT11 / DT12 < 2.15; the relationship between the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: 0.50 < d1s / (R1 - R2) ≤ 0.75.

[0021] The sports camera lens of the present application consists of a first group, a prism, and a second group. In order to obtain a large field angle, the sports camera lens satisfies 95° ≤ Semi-FOV < 100° and 1.95 < DT11 / DT12 < 2.15. It can be seen that under the condition of a large field angle, the effective diameter of the object side surface of the first lens is much larger than the effective diameter of the image side surface. Large-angle incident light can enter the first lens. However, when the marginal light exits through the image side surface of the first lens, the difference between the exit angle and the incident angle is relatively large, resulting in a large change in the refraction angle of the marginal light at the object side surface and the image side surface of the first lens. Furthermore, the difference in the refractive index of different wavelengths of light is amplified, and the axial chromatic aberration is serious. Eventually, the defocus problem of the marginal field of the first lens is relatively obvious, thus affecting the imaging performance of the sports camera lens. Based on this, the present application controls the ratio of the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens within a reasonable range by restricting the relationship between them, so that the first spacer element can intercept and absorb the ineffective light exiting from the image side surface of the first lens, reduce the marginal chromatic aberration problem on the image side of the first lens, thereby improving the defocus situation of the marginal field of the first lens, and ensuring that the first lens meets the imaging performance requirements of the sports camera lens while satisfying the large field angle. Description of the Drawings

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1A A partial dimensioning diagram of an action camera lens according to an alternative embodiment of the present invention is shown;

[0024] Figure 1B It shows Figure 1A Partial dimension annotation diagram of action camera lenses;

[0025] Figure 2 A partial structural schematic diagram of the action camera lens of Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 A partial structural schematic diagram of the action camera lens of Embodiments 1-2 of the present invention is shown;

[0027] Figure 4 The diagram shows partial structural schematics of the action camera lens in embodiments 1-3 of the present invention;

[0028] Figure 5 The on-axis chromatic aberration curve of the action camera lens according to Embodiment 1 of the present invention is shown;

[0029] Figure 6 The astigmatism curve of the action camera lens according to Embodiment 1 of the present invention is shown;

[0030] Figure 7 A partial structural schematic diagram of the action camera lens of Embodiment 2-1 of the present invention is shown;

[0031] Figure 8 A partial structural schematic diagram of the action camera lens of Embodiment 2-2 of the present invention is shown;

[0032] Figure 9 A partial structural schematic diagram of the action camera lens of Embodiments 2-3 of the present invention is shown;

[0033] Figure 10 The on-axis chromatic aberration curve of the action camera lens according to Embodiment 2 of the present invention is shown;

[0034] Figure 11 The astigmatism curve of the action camera lens of Embodiment 2 of the present invention is shown;

[0035] Figure 12 A partial structural schematic diagram of the action camera lens of Embodiment 3-1 of the present invention is shown;

[0036] Figure 13A partial structural schematic diagram of the action camera lens of Embodiment 3-2 of the present invention is shown;

[0037] Figure 14 A partial structural schematic diagram of the action camera lens of Embodiment 3-3 of the present invention is shown;

[0038] Figure 15 The on-axis chromatic aberration curve of the action camera lens according to Embodiment 3 of the present invention is shown;

[0039] Figure 16 The astigmatism curve of the action camera lens of Embodiment 3 of the present invention is shown;

[0040] Figure 17 The diagram shows the defocus curve of an action camera lens satisfying Semi-FOV=98.80°, DT11 / DT12=2.11 and d1s / (R1-R2)=0.54 according to Embodiment 3-1 of the present invention.

[0041] Figure 18 The defocus curve of an example action camera lens that satisfies Semi-FOV=98.80°, DT11 / DT12=2.11 and d1s / (R1-R2)=0.20 is shown.

[0042] Figure 19 The defocus curve of an action camera lens with Semi-FOV=98.80°, DT11 / DT12=2.11 and d1s / (R1-R2)=1.10 is shown in another example.

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

[0044] 100. Prism; 200. Inner annular protrusion; P01. First lens barrel; P02. Second lens barrel; E1. First lens; P1. First spacer element; E2. Second lens; E3. Third lens; E4. Fourth lens; E5. Fifth lens; P5. Fifth spacer element; E6. Sixth lens; E7. Seventh lens; P7. Seventh spacer element; E8. Eighth lens; S1. Object-side surface of the first lens; S2. Image-side surface of the first lens; S3. Second lens S4, the image side of the second lens; S5, the object side of the third lens; S6, the image side of the third lens; S7, the object side of the fourth lens; S8, the image side of the fourth lens (object side of the fifth lens); S9, the image side of the fifth lens; S10, the object side of the sixth lens; S11, the image side of the sixth lens (object side of the seventh lens); S12, the image side of the seventh lens; S13, the object side of the eighth lens; S14, the image side of the eighth lens. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and 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 one of ordinary skill in the art to which this application pertains.

[0047] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

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

[0049] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0050] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity 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 location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0051] To address the problem that existing action camera lenses suffer from poor edge imaging performance in order to meet the requirements of a large field of view, this invention provides an action camera lens.

[0052] like Figure 1A , Figures 1B to 17As shown, the sports camera lens consists of eight lenses. The sports camera lens includes a first group, a prism, and a second group arranged in sequence from the object side to the image side. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens. The first optical axis and the second optical axis are perpendicular to each other. Half of the maximum field angle of the sports camera lens, Semi - FOV, satisfies: 95° ≤ Semi - FOV < 100°. The relationship between the effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfies: 1.95 < DT11 / DT12 < 2.15. The relationship between the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: 0.50 < d1s / (R1 - R2) ≤ 0.75.

[0053] The sports camera lens of the present application consists of a first group, a prism, and a second group. In order to obtain a large field angle, the sports camera lens satisfies 95° ≤ Semi - FOV < 100° and 1.95 < DT11 / DT12 < 2.15. Thus, under the condition of a large field angle, the effective diameter of the object side surface of the first lens is much larger than that of the image side surface, and incident light at a large angle can enter the first lens. However, when the marginal rays exit through the image side surface of the first lens, the difference between the exit angle and the incident angle is relatively large, resulting in a large change in the refraction angle of the marginal rays at the object side surface and the image side surface of the first lens. Furthermore, the difference in the refractive index of different wavelengths of light is amplified, and the axial chromatic aberration is severe. Eventually, the defocus problem of the marginal field of the first lens is relatively obvious, affecting the imaging performance of the sports camera lens. Based on this, the present application controls the relationship between the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens, and makes the ratio of the inner diameter of the first spacer element and the difference in the curvature radii of the object side surface and the image side surface of the first lens within a reasonable range, so that the first spacer element can intercept and absorb the invalid light exiting from the image side surface of the first lens, reduce the marginal chromatic aberration problem on the image side of the first lens, improve the defocus situation of the marginal field of the first lens, and ensure that the first lens meets the imaging performance requirements of the sports camera lens while satisfying the large field angle.

[0054] In addition, refer to Figures 17 to 19As shown, on the premise that the sports camera lens satisfies 95° ≤ Semi - FOV < 100° and 1.95 < DT11 / DT12 < 2.15, for example, Semi - FOV = 98.80° and DT11 / DT12 = 2.11, Figure 17 The defocus curve graph of the sports camera lens of Embodiment 3 - 1 of the present invention is shown. Specifically, in Embodiment 3 - 1, the sports camera lens satisfies d1s / (R1 - R2) = 0.74. Figure 18 The defocus curve graph of an example sports camera lens is shown. Specifically, in this example, the sports camera lens satisfies d1s / (R1 - R2) = 0.20. Hereinafter, this example is referred to as Example 1. Figure 19 The defocus curve graph of another example sports camera lens is shown. Specifically, in this example, the sports camera lens satisfies d1s / (R1 - R2) = 1.10. Hereinafter, this example is referred to as Example 2. In the defocus curve graph, the abscissa is the defocus position with the unit of mm, the ordinate is the modulation transfer function without dimension, Field of View 1 is the 0F field of view, Field of View 2 is the 0.7F field of view, Field of View 3 is the 0.9F field of view, and Field of View 4 is the 1.0F field of view.

[0055] As Figure 17 shown, when the sports camera lens satisfies d1s / (R1 - R2) = 0.54, the first spacer element intercepts and absorbs the invalid light rays emitted from the image side of the first lens. The peak values of the defocus curves of each field of view are relatively concentrated, and the peak value at the 0mm defocus position of the edge field of view is also relatively large, indicating that the performance of the sports camera lens of Embodiment 3 - 1 is better.

[0056] As Figure 18 shown, when the sports camera lens satisfies d1s / (R1 - R2) = 0.20, the inner diameter of the first spacer element is too small, resulting in the truncation of the effective light rays in the edge fields of view (Field of View 3 and Field of View 4, that is, the 0.9F field of view and the 1.0F field of view) by the first spacer element, resulting in poor edge imaging of the sports camera lens. The defocus curves of each field of view shift significantly left and right, and the peak value at the 0mm defocus position of the edge field of view drops severely, indicating that the performance of the sports camera lens of Example 1 is poor.

[0057] As Figure 19 shown, when the sports camera lens satisfies d1s / (R1 - R2) = 1.10, the inner diameter of the first spacer element is too large, resulting in the entry of the invalid light rays of the first lens into the rear lens, resulting in a larger edge chromatic aberration of the sports camera lens. The defocus curves of each field of view shift significantly left and right, and the peak value at the 0mm defocus position of the edge field of view drops severely, indicating that the performance of the sports camera lens of Example 2 is poor.

[0058] In summary, as Figures 17 to 19As shown, when the sports camera lens satisfies 95° ≤ Semi - FOV < 100°, 1.95 < DT11 / DT12 < 2.15, and ensures that d1s / (R1 - R2) is within the range of 0.50 to 0.75, the first spacer element of the sports camera lens intercepts and absorbs the ineffective light rays emitted from the image side of the first lens, and the peak values of the defocus curves of each field of view are concentrated, indicating that the sports camera lens of Embodiment 3 - 1 has the best performance. Therefore, by restricting d1s / (R1 - R2) within a reasonable range, this application controls the ratio of the inner diameter of the first spacer element to the difference in the curvature radii of the object side and the image side of the first lens within a reasonable range, enabling the first spacer element to intercept and absorb the ineffective light rays emitted from the image side of the first lens, reducing the marginal chromatic aberration problem on the image side of the first lens, thereby improving the defocus situation of the marginal field of view of the first lens, and ensuring that the first lens meets the imaging performance requirements of the sports camera lens while satisfying a large field of view angle.

[0059] In some optional embodiments, the prism includes a prism incident surface, a prism reflecting surface, and a prism exit surface. The angle between the prism incident surface and the prism exit surface is 90°, and the prism incident surface, the prism reflecting surface, and the prism exit surface are all flat surfaces. The light rays from the object side are refracted by the first lens and the second lens of the first group and then reach the prism incident surface. Subsequently, the light rays propagate to the prism reflecting surface and are deflected by 90°. After the reflection is completed, the light rays are refracted again from the prism exit surface and projected into the second group, and are finally converged onto the imaging surface of the sports camera lens after being refracted by the third lens to the eighth lens. By deflecting the light rays by 90° through the prism, the space inside the sports camera lens is saved, meeting the requirements of miniaturization and portability.

[0060] Among them, the first optical axis is perpendicular to the prism incident surface, the second optical axis is perpendicular to the prism exit surface, and the prism reflecting surface reflects the light rays transmitted along the first optical axis to be transmitted along the second optical axis.

[0061] In some optional embodiments, the spacing distance T2Y between the image side of the second lens and the prism incident surface on the first optical axis and the spacing distance TY3 between the prism exit surface and the object side of the third lens on the second optical axis satisfy: 6.00 ≤ T2Y / TY3 < 6.90. By setting T2Y / TY3 within a reasonable range, the spacing distances between the first group and the prism, and between the prism and the second group are controlled, meeting the assembly requirements of the sports camera lens on the basis of ensuring miniaturization, and improving the assembly accuracy of the first group, the prism, and the second group.

[0062] In some optional embodiments, the axial distance TD between the object side surface of the first lens and the image side surface of the eighth lens and the effective focal length f of the action camera lens satisfy: 13.45 < TD / f < 14.05. By setting TD / f within a reasonable range, the overall optical length and the effective focal length of the action camera lens are restricted, so that while the effective focal length of the action camera lens meets the imaging requirements, the overall optical length is limited, and the volume of the action camera lens is reduced as much as possible on the premise of ensuring imaging.

[0063] In some optional embodiments, the effective focal length f of the action camera lens satisfies: 2.30 mm < f < 2.70 mm. Preferably, the effective focal length f of the action camera lens can further satisfy: 2.50 mm < f < 2.60 mm.

[0064] It should be noted that TD is the sum of the spacing distance between the object side surface of the first lens and the prism reflection surface on the first optical axis and the spacing distance between the prism reflection surface and the image side surface of the eighth lens on the second optical axis.

[0065] In some optional embodiments, the inner diameter d1m of the image side surface of the first lens, the inner diameter d01m of the image side end surface of the first lens barrel, and the effective focal length f2 of the second lens satisfy: -0.85 ≤ (d1m - d01m) / f2 < 2.55. By setting (d1m - d01m) / f2 within a reasonable range, it is ensured that the second lens can effectively bear against between the first spacer element and the first lens barrel, improving the assembly stability among the first lens, the second lens and the first lens barrel, thereby reducing the assembly error and being beneficial to improving the assembly yield of the action camera lens.

[0066] In some optional embodiments, the inner diameter d1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.20 < d1s / (f1 - f2) < -0.85. By setting d1s / (f1 - f2) within a reasonable range, the inner diameter of the object side surface of the first spacer element and the relationship between the effective focal lengths of the first lens and the second lens in the first group are restricted, so that the first spacer element effectively intercepts the invalid light rays emitted from the first lens, while reducing the risk of stray light generated by the reflection of the invalid light rays in the first group and avoiding the entry of excess light rays into the action camera lens.

[0067] In some optional embodiments, the maximum height L1 of the first lens barrel and the maximum height L2 of the second lens barrel satisfy: 0.85 < L1 / L2 < 1.25. By setting L1 / L2 within a reasonable range, the ratio of the maximum heights of the first lens barrel and the second lens barrel is restricted, effectively limiting the overall size of the action camera lens and achieving the miniaturization of the action camera lens.

[0068] It should be noted that L1 is the distance between the object-side end face and the image-side end face of the first lens barrel along the direction of the first optical axis, and L2 is the distance between the object-side end face and the image-side end face of the second lens barrel along the direction of the second optical axis.

[0069] In some optional embodiments, the outer diameter D01s of the object-side end face of the first lens barrel and the maximum height L2 of the second lens barrel satisfy: 3.35 < D01s / L2 < 3.60. By setting D01s / L2 within a reasonable range, that is, controlling the ratio of the outer diameter of the object-side end face of the first lens barrel to the maximum height of the second lens barrel, the overall size of the sports camera lens can be effectively controlled, ensuring the miniaturization of the sports camera lens, thereby avoiding the risk of collision between the first group and the second group during the assembly process; at the same time, restricting the above formula within a reasonable range can optimize the relative sizes of the first group and the second group.

[0070] In some optional embodiments, the second lens barrel includes an inner-ring surface protrusion, which is provided on a part of the inner-ring surface of the second lens barrel and protrudes in the direction close to the second optical axis. The inner-ring surface protrusion has an object side surface facing the object-side end face of the second lens barrel and an image side surface facing the image-side end face of the second lens barrel. The inner diameter of the image side surface of the inner-ring surface protrusion is the minimum value of the inner diameter of the inner-ring surface of the second lens barrel. The object side surface of the inner-ring surface protrusion contacts the image side surface of the third lens, and the image side surface of the inner-ring surface protrusion contacts the object side surface of the fourth lens. By providing an inner-ring surface protrusion on the inner-ring surface of the second lens barrel, and the inner-ring surface protrusion is integrally formed with the second lens barrel, reducing the use of spacer elements and ensuring the stability of assembly, thereby improving the assembly accuracy of the sports camera lens and effectively preventing the risk of vibration during actual use.

[0071] In some optional embodiments, the minimum inner diameter dQs of the inner-ring surface protrusion, the effective diameter DT32 of the image side surface of the third lens, and the effective diameter DT41 of the object side surface of the fourth lens satisfy: 1.85 < dQs / (DT32 - DT41) < 3.30. The aperture of the sports camera lens is located between the third lens and the fourth lens. By setting dQs / (DT32 - DT41) within a reasonable range and controlling the minimum inner diameter of the inner-ring surface protrusion, it has a reasonable size between the third lens and the fourth lens, which can effectively block stray light while not obstructing the propagation path of normal light.

[0072] In some optional embodiments, the fourth lens and the fifth lens are glued to form a glued lens, and the sixth lens and the seventh lens are glued to form a glued lens. By providing two groups of glued lenses, it can ensure that the optical paths of the light passing through the fourth lens and the fifth lens, the sixth lens and the seventh lens are consistent, reducing light energy loss, thereby improving the clarity and contrast of imaging. At the same time, the glued lens also has good adhesion and durability, effectively improving the stability of the sports camera lens in various use environments.

[0073] In some optional embodiments, the second group further includes a seventh spacer element, which is located on the object side of the eighth lens and contacts the object side surface of the eighth lens; the inner diameter d7s of the object side surface of the seventh spacer element and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.20 < d7s / f67 ≤ -0.30. By providing the seventh spacer element and constraining d7s / f67 within a reasonable range, the inner diameter of the object side surface of the seventh spacer element can be restricted, so that it can effectively block the marginal stray light generated by the cemented lens of the sixth lens and the seventh lens.

[0074] In some optional embodiments, the interval distance CPQ on the second optical axis between the object side surface and the image side surface of the inner ring surface protrusion, and the interval distance T34 on the second optical axis between the image side surface of the third lens and the object side surface of the fourth lens satisfy: 0.90 < CPQ / T34 < 1.80. By constraining CPQ / T34 within a reasonable range, on the one hand, the thickness of the inner ring surface protrusion along the second optical axis and the interval distance between the third lens and the fourth lens on the second optical axis can be balanced, and on the other hand, the edge thickness of the ineffective diameter region of the third lens and the fourth lens can be indirectly controlled, thereby improving the assembly stability of the third lens and the fourth lens.

[0075] In some optional embodiments, the second group further includes a seventh spacer element, which is located on the object side of the eighth lens and contacts the object side surface of the eighth lens; the radius of curvature R13 of the object side surface of the eighth lens, the inner diameter d7m of the image side surface of the seventh spacer element, and the outer diameter D7m of the image side surface of the seventh spacer element satisfy: 3.10 < R13 / (D7m - d7m) < 15.55. By defining the ratio between the annular width of the image side surface of the seventh spacer element and the radius of curvature of the eighth lens, the bearing area between the seventh spacer element and the object side surface of the eighth lens is made reasonable, thereby improving the assembly stability of the eighth lens. At the same time, stray light can be blocked by the seventh spacer element from entering the eighth lens, improving the imaging quality.

[0076] It should be noted that the temperature range of the all-glass-designed action camera lens is relatively wide, and stable optical performance can be maintained within the range of -40°C to 105°C. Specifically, when focusing on the resolution quality and reliability, the first lens to the eighth lens can all be glass aspherical lenses. Of course, in application scenarios with lower temperature stability requirements, the first lens to the eighth lens in the action camera lens can also all be made of plastic. Making optical lenses with plastic can effectively reduce the production cost. Of course, the first lens to the eighth lens in the optical lens can also be made of a combination of plastic and glass.

[0077] In another aspect, in another alternative embodiment, a sports camera lens is provided. The sports camera lens consists of eight lenses and includes, from the object side to the image side, a first group, a prism, and a second group arranged in sequence. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens. The first optical axis and the second optical axis are perpendicular to each other. Half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°. The relationship between the effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfies: 1.95 < DT11 / DT12 < 2.15. The relationship between the inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f of the sports camera lens satisfies: -4.40 ≤ (d1s / D1s) × (f1 / f) ≤ -3.00.

[0078] The sports camera lens of the present application consists of a first group, a prism, and a second group. In order to obtain a large field angle, the sports camera lens satisfies 95° ≤ Semi-FOV < 100° and 1.95 < DT11 / DT12 < 2.15. It can be seen that under the condition of a large field angle, the effective diameter of the object side surface of the first lens is much larger than that of the image side surface, and incident light at a large angle can enter the first lens. However, when the marginal rays exit through the image side surface of the first lens, the difference between the exit angle and the incident angle is relatively large, resulting in a large change in the refraction angle of the marginal rays at the object side surface and the image side surface of the first lens, serious axial chromatic aberration, and ultimately obvious defocus problems in the marginal field of view of the first lens, thus affecting the imaging performance of the sports camera lens. Based on this, the present application controls the relationship between the inner diameter d1s of the object side surface of the first spacer element, the outer diameter D1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f of the sports camera lens, controls the ratio of the inner and outer diameters of the first spacer element, enables the first spacer element to intercept invalid rays that deviate from the ideal optical path due to large refraction angle changes, and at the same time controls the contribution of the effective focal length of the first lens to the effective focal length of the sports camera lens, optimizes the cooperation relationship between the first spacer element and the first lens, helps to adjust the light beam path more uniformly, and thus improves the resolution and contrast of the imaging of the sports camera lens.

[0079] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0080] In another aspect, in another alternative embodiment, a sports camera lens is provided. The sports camera lens consists of eight lenses and includes, from the object side to the image side, a first group, a prism, and a second group arranged in sequence. The first group includes a first lens barrel and a first lens, a first spacer element, and a second lens sequentially accommodated in the first lens barrel along the first optical axis of the sports camera lens. The first spacer element is located between the first lens and the second lens and contacts the image side surface of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially accommodated in the second lens barrel along the second optical axis of the sports camera lens. The first optical axis and the second optical axis are perpendicular to each other. Half of the maximum field angle of the sports camera lens, Semi-FOV, satisfies: 95° ≤ Semi-FOV < 100°. The effective diameter DT11 of the object side surface of the first lens and the effective diameter DT12 of the image side surface of the first lens satisfy: 1.95 < DT11 / DT12 < 2.15. The outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, the air gap T12 between the image side surface of the first lens and the object side surface of the second lens on the first optical axis, and the spacing distance T2Y between the image side surface of the second lens and the incident surface of the prism on the first optical axis satisfy: 1.85 ≤ (D1s - d1s) / (T12 + T2Y) < 2.45.

[0081] The sports camera lens of the present application consists of a first group, a prism, and a second group. In order to obtain a large field of view angle, the sports camera lens satisfies 95° ≤ Semi-FOV < 100° and 1.95 < DT11 / DT12 < 2.15. It can be seen that under the condition of a large field of view angle, the effective diameter of the object side of the first lens is much larger than the effective diameter of the image side. Large-angle incident light can enter the first lens. However, when the marginal light exits from the image side of the first lens, the difference between the exit angle and the incident angle is relatively large, resulting in a large change in the refraction angle of the marginal light at the object side and the image side of the first lens, serious axial chromatic aberration, and ultimately obvious defocus problems in the marginal field of view of the first lens, thus affecting the imaging performance of the sports camera lens. Based on this, the present application controls the relationship between the outer diameter D1s of the object side of the first spacer element, the inner diameter d1s of the object side of the first spacer element, the air gap T12 on the first optical axis between the image side of the first lens and the object side of the second lens, and the spacer distance T2Y on the first optical axis between the image side of the second lens and the incident surface of the prism, and controls the relationship between the difference between the outer diameter and the inner diameter of the first spacer element, the air gap between the first lens and the second lens, and the positions of the first group and the prism, so that the first spacer element can intercept and absorb the ineffective light exiting from the image side of the first lens, reduce the marginal chromatic aberration generated by the ineffective light, and at the same time optimize the distances between the first lens, the second lens and the prism, provide sufficient space for light transmission, control the propagation path and the final focusing position of the marginal light between the first lens and the second lens, reduce the accumulation of chromatic aberration, and further improve the marginal imaging quality of the sports camera lens.

[0082] 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.

[0083] Optionally, the above sports camera lens may further include a filter located between the imaging surface and the eighth lens.

[0084] Optionally, the above sports camera lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0085] It should be noted that each lens consists of an optical effective diameter region located at the center and an optical structure region located at the edge. The optical structure region is located on the outer peripheral side of the optical effective diameter region and is arranged circumferentially around the optical effective diameter region. The optical effective diameter region is used for the passage of imaging light, while the optical structure region is not used for the passage of imaging light. The optical structure region is used to abut against the lens barrel, an adjacent lens, or an adjacent spacer element. The optical structure region is also referred to as a non-effective diameter region.

[0086] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0087] Figure 1A , Figure 1B The accompanying drawings show partial dimensional annotations for an action camera lens according to this application, indicating parameters such as d1s, d1m, D1s, d01m, D01s, d7s, dQs, L1, L2, d7m, D7m, CPQ, DT11, DT12, DT32, and DT41 to clearly and intuitively understand the meaning of these parameters. To facilitate the description of the action camera lens and the specific lens surface shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0088] It should be noted that, in the process of light traveling from the object being photographed to the imaging surface, along the direction of light transmission, the object side refers to the side where the optical element receives the light, or in other words, the side where the object to be imaged is located along the direction of light transmission, with the optical element as the boundary. The image side refers to the side where the optical element emits the light, or in other words, the side where the image of the object to be imaged is located along the direction of light transmission, with the optical element as the boundary.

[0089] It should be noted that the object-side end face of the lens barrel refers to the surface of the lens barrel closest to the object side and perpendicular to the optical axis; the image-side end face of the lens barrel refers to the surface of the lens barrel closest to the image side and perpendicular to the optical axis; the object-side surface of the spacer element refers to the surface that contacts the optical element located on the object side of the spacer element and is perpendicular to the optical axis; the image-side surface of the spacer element refers to the surface that contacts the optical element located on the image side of the spacer element and is perpendicular to the optical axis. The annular width of the spacer element refers to the radial width of the spacer element, specifically the annular width of the object-side surface of the spacer element and the annular width of the image-side surface of the spacer element. The annular width of the object-side surface of the spacer element is the difference between the outer diameter and the inner diameter of the object-side surface of the spacer element, and the annular width of the image-side surface of the spacer element is the difference between the outer diameter and the inner diameter of the image-side surface of the spacer element. Wherein, when the lens barrel and spacer element are structural components of the first group, the optical axis is the first optical axis; when the lens barrel and spacer element are structural components of the second group, the optical axis is the second optical axis.

[0090] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of action camera lenses applicable to the above embodiments.

[0091] It should be noted that in the following Embodiment 1, there are Embodiments 1-1, 1-2, and 1-3; in Embodiment 2, there are Embodiments 2-1, 2-2, and 2-3; and in Embodiment 3, there are Embodiments 3-1, 3-2, and 3-3. Within the same embodiment, the curvature radius, center thickness, and other parameters of the first to eighth lenses of the action camera lens, as well as the spacing distance and higher-order coefficients between the lenses, are the same. However, the thickness, inner diameter, and outer diameter of the first lens barrel, second lens barrel, first spacer element, and seventh spacer element, as well as the shape of some lenses, are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0092] It should be noted that any of the embodiments described in Examples 1 to 3 below are applicable to all implementation methods of this application.

[0093] Example 1

[0094] like Figures 2 to 6 As shown, the action camera lens of Embodiment 1 is described. Figure 2 A schematic diagram of the action camera lens of Embodiment 1-1 is shown. Figure 3 The diagram shows the structural schematics of the action camera lenses in Embodiments 1-2. Figure 4 The diagram shows the structural schematics of the action camera lenses in Examples 1-3.

[0095] like Figures 2 to 4 As shown, the action camera lens includes a first lens barrel P01, a prism 100, a second lens barrel P02, eight lenses, and multiple spacers. The first group includes the first lens barrel P01 and a first lens E1, a first spacer P1, and a second lens E2 arranged sequentially from the object side to the image side within the first lens barrel P01. The second group includes the second lens barrel P02 and a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8 arranged sequentially from the object side to the image side within the second lens barrel P02. The third lens E3 and the fourth lens E4 are located on opposite sides of the inner annular protrusion 200.

[0096] like Figure 2 The diagram shown is a schematic representation of the structure of a sports camera lens in Embodiment 1-1. In this embodiment, a fifth spacer element P5 is also provided in the second group. At this time, the object-side surface and image-side surface of the first spacer element P1 are 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 fifth spacer element P5 are in contact with the image-side surface S9 of the fifth lens and the object-side surface S10 of the sixth lens, respectively; the object-side surface and image-side surface of the seventh spacer element P7 are in contact with the image-side surface S12 of the seventh lens and the object-side surface S13 of the eighth lens, respectively.

[0097] like Figure 3 The diagram shows a schematic of the action camera lens in Embodiment 1-2. The difference from Embodiment 1-1 is that the second group of spacers only includes a seventh spacer element P7. In this case, the object-side and image-side of the first spacer element P1 contact the image-side S2 of the first lens and the object-side S3 of the second lens, respectively; the object-side and image-side of the seventh spacer element P7 contact the image-side S12 of the seventh lens and the object-side S13 of the eighth lens, respectively. Between the fifth and sixth lenses, the inner ring of the lens barrel protrudes towards the direction close to the second optical axis to form a second protruding structure. The object-side and image-side of the second protruding structure contact the object-side S9 of the fifth lens and the object-side S10 of the sixth lens, respectively.

[0098] like Figure 4 The diagram shown is a structural schematic of the action camera lens in Embodiments 1-3. The support method of each spacer element is the same as in Embodiment 1-1, and will not be described in detail here.

[0099] In summary, the structural parameters of the action camera lens in Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 8.

[0100] In Embodiment 1, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens E6 has negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The seventh lens E7 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The eighth lens, E8, has positive optical power. Its object-side surface, S13, is convex, and its image-side surface, S14, is concave. In Table 1, OBJ (not shown in the figure) represents the object surface of the action camera lens, and STO (not shown in the figure) represents the aperture stop, located between the third lens, E3, and the fourth lens, E4. S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, respectively. S17 (not shown in the figure) is the imaging surface of the action camera lens. Light rays from the object surface pass through S1 to S16 and reach S17.

[0101] Table 1 shows the basic structural parameters of the action camera lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0102]

[0103] Table 1

[0104] In Embodiment 1, the object-side surface and image-side surface of the second lens E2, the third lens E3, and the eighth lens E8 are all aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0105] Formula (1)

[0106] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirrors S3-S6 and S13-S14 in Example 1.

[0107]

[0108] Table 2

[0109] Figure 5 The on-axis chromatic aberration curve of the action camera lens in Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the action camera lens. Figure 6 The astigmatism curve of the action camera lens in Embodiment 1 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles.

[0110] according to Figures 5 to 6 As can be seen, the action camera lens given in Example 1 can achieve good image quality.

[0111] Example 2

[0112] like Figures 7 to 11 As shown, the action camera lens of Embodiment 2 is described. Figure 7 A schematic diagram of the action camera lens in Embodiment 2-1 is shown. Figure 8 A schematic diagram of the action camera lens in Embodiment 2-2 is shown. Figure 9 A schematic diagram of the action camera lens in Embodiments 2-3 is shown.

[0113] like Figures 7 to 9As shown, the action camera lens includes a first lens barrel P01, a prism 100, a second lens barrel P02, eight lenses, and multiple spacers. The first group includes the first lens barrel P01 and a first lens E1, a first spacer P1, and a second lens E2 arranged sequentially from the object side to the image side within the first lens barrel P01. The second group includes the second lens barrel P02 and a third lens E3, a fourth lens E4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8 arranged sequentially from the object side to the image side within the second lens barrel P02. The third lens E3 and the fourth lens E4 are located on opposite sides of the inner annular protrusion 200.

[0114] like Figure 7 The diagram shown is a schematic representation of the structure of an action camera lens in Embodiment 2-1. In this embodiment, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively; the object-side and image-side of the fifth spacer element P5 are in contact with the image-side S9 of the fifth lens and the object-side S10 of the sixth lens, respectively; and the object-side and image-side of the seventh spacer element P7 are in contact with the image-side S12 of the seventh lens and the object-side S13 of the eighth lens, respectively.

[0115] like Figure 8 The diagram shown is a structural schematic of the action camera lens in Embodiment 2-2. The support method of each spacer element is the same as in Embodiment 2-1, and will not be described in detail here.

[0116] like Figure 9 The diagram shown is a structural schematic of the action camera lens in Embodiment 2-3. The support method of each spacer element is the same as in Embodiment 2-1, and will not be described in detail here.

[0117] In summary, the structural parameters of the action camera lens in Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 8.

[0118] In Embodiment 2, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens E6 has negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The seventh lens E7 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The eighth lens, E8, has positive optical power. Its object-side surface, S13, is convex, and its image-side surface, S14, is concave. In Table 1, OBJ (not shown in the figure) represents the object surface of the action camera lens, and STO (not shown in the figure) represents the aperture stop, located between the third lens, E3, and the fourth lens, E4. S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, respectively. S17 (not shown in the figure) is the imaging surface of the action camera lens. Light rays from the object surface pass through S1 to S16 and reach S17.

[0119] Table 3 shows the basic structural parameters of the action camera lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0120]

[0121] Table 3

[0122] Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S3-S6, S13-S14 in Example 2. Among them, each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0123]

[0124] Table 4

[0125] Figure 10 The on-axis chromatic aberration curve of the action camera lens in Embodiment 2 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the action camera lens. Figure 11 The astigmatism curve of the action camera lens in Embodiment 2 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles.

[0126] according to Figures 10 to 11It can be seen that the action camera lens given in Example 2 can achieve good image quality.

[0127] Example 3

[0128] like Figures 12 to 16 As shown, the action camera lens of Embodiment 3 is described. Figure 12 A schematic diagram of the action camera lens of Embodiment 3-1 is shown. Figure 13 A schematic diagram of the action camera lens of Embodiment 3-2 is shown. Figure 14 A schematic diagram of the structure of the action camera lens in Embodiment 3-3 is shown.

[0129] like Figures 12 to 14 As shown, the action camera lens includes a first lens barrel P01, a prism 100, a second lens barrel P02, eight lenses, and multiple spacers. The first group includes the first lens barrel P01 and a first lens E1, a first spacer P1, and a second lens E2 arranged sequentially from the object side to the image side within the first lens barrel P01. The second group includes the second lens barrel P02 and a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8 arranged sequentially from the object side to the image side within the second lens barrel P02. The third lens E3 and the fourth lens E4 are located on opposite sides of the inner annular protrusion 200.

[0130] like Figure 12 The diagram shown is a schematic representation of the structure of a sports camera lens in Embodiment 3-1. In this embodiment, the object-side surface and image-side surface of the first spacer element P1 are 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 seventh spacer element P7 are in contact with the image-side surface S12 of the seventh lens and the object-side surface S13 of the eighth lens, respectively.

[0131] like Figure 13 The diagram shown is a schematic representation of the action camera lens in Embodiment 3-2. The difference from Embodiment 3-1 is that, between the fifth and sixth lenses, the inner ring of the lens barrel protrudes towards the second optical axis to form a second protruding structure. The object-side and image-side of the second protruding structure contact the object-side S9 of the fifth lens and the object-side S10 of the sixth lens, respectively. The bearing method of the remaining spacer elements is the same as in Embodiment 3-1, and will not be described in detail here.

[0132] like Figure 14The diagram shown is a schematic representation of the action camera lens in Embodiment 3-3. The difference from Embodiment 3-1 is that, between the fifth and sixth lenses, the inner ring of the lens barrel protrudes towards the second optical axis to form a second protruding structure. The object-side and image-side of the second protruding structure contact the object-side S9 of the fifth lens and the object-side S10 of the sixth lens, respectively. The object-side and image-side of the seventh spacer element P7 contact the image-side S11 of the sixth lens and the object-side S13 of the eighth lens, respectively. The bearing method of the remaining spacer elements is the same as in Embodiment 3-1, and will not be described in detail here.

[0133] In summary, the structural parameters of the action camera lens in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8.

[0134] In Embodiment 3, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens E6 has negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The seventh lens E7 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The eighth lens, E8, has positive optical power. Its object-side surface, S13, is convex, and its image-side surface, S14, is concave. In Table 1, OBJ (not shown in the figure) represents the object surface of the action camera lens, and STO (not shown in the figure) represents the aperture stop, located between the third lens, E3, and the fourth lens, E4. S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, respectively. S17 (not shown in the figure) is the imaging surface of the action camera lens. Light rays from the object surface pass through S1 to S16 and reach S17.

[0135] Table 5 shows the basic structural parameters of the action camera lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0136]

[0137] Table 5

[0138] Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S3-S6, S13-S14 in Example 3. Among them, each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0139]

[0140] Table 6

[0141] Figure 15 The on-axis chromatic aberration curve of the action camera lens in Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the action camera lens. Figure 16 The astigmatism curve of the action camera lens in Embodiment 3 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different half-field angles.

[0142] according to Figures 15 to 16 As can be seen, the action camera lens given in Example 3 can achieve good image quality.

[0143] In summary, the action camera lenses of Examples 1 to 3 respectively satisfy the relationships shown in Table 7.

[0144]

[0145] Table 7

[0146] Table 8 shows some parameters of the action camera lenses in Embodiments 1 to 3. Wherein, f is the effective focal length of the action camera lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, and f67 is the combined focal length of the sixth and seventh lenses.

[0147]

[0148] Table 8

[0149] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone 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 action camera lens described above.

[0150] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0151] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0152] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0153] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lens for an action camera, characterized in that, The action camera lens is composed of eight lenses, and the action camera lens includes a first group, a prism and a second group arranged in sequence from the object side to the image side; The first group includes a first lens barrel and a first lens, a first spacer element and a second lens sequentially housed within the first lens barrel along the first optical axis of the action camera lens. The first spacer element is located between the first lens and the second lens and is in contact with the image side of the first lens. The second group includes a second lens barrel and a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are sequentially housed within the second lens barrel along the second optical axis of the action camera lens; The first optical axis is perpendicular to the second optical axis; The maximum field of view (Semi-FOV) of the action camera lens must satisfy: 95° ≤ Semi-FOV < 100°; The effective diameter DT11 of the object side of the first lens and the effective diameter DT12 of the image side of the first lens satisfy the following relationship: 1.95 <DT11 / DT12<2.15; The inner diameter d1s of the object-side surface of the first spacer element, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens satisfy the following relationship: 0.50 <d1s / (R1-R2)≤0.75。 2. The action camera lens according to claim 1, characterized in that, The prism includes an incident surface, a reflecting surface, and an exit surface. The angle between the incident surface and the exit surface is 90°. The incident surface, the reflecting surface, and the exit surface are all planar. The distance T2Y between the image-side surface of the second lens and the incident surface of the prism on the first optical axis, and the distance TY3 between the exit surface of the prism and the object-side surface of the third lens on the second optical axis satisfy the following condition: 6.00 ≤ T2Y / TY3 < 6.

90.

3. The action camera lens according to claim 1, characterized in that, The axial distance TD between the object-side surface of the first lens and the image-side surface of the eighth lens, and the effective focal length f of the action camera lens, satisfy the following condition: 13.

45. <TD / f<14.05。 4. The action camera lens according to claim 1, characterized in that, The inner diameter d1m of the image side of the first lens, the inner diameter d01m of the image side end face of the first lens barrel, and the effective focal length f2 of the second lens satisfy the following condition: -0.85≤(d1m-d01m) / f2<2.

55.

5. The action camera lens according to claim 1, characterized in that, The inner diameter d1s of the object side of the first spacer element, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy the following relationship: -1.20 <d1s / (f1-f2)<-0.85。 6. The action camera lens according to claim 1, characterized in that, The maximum height L1 of the first lens barrel and the maximum height L2 of the second lens barrel satisfy the following condition: 0.85 <L1 / L2<1.25。 7. The action camera lens according to claim 1, characterized in that, The outer diameter D01s of the object-side end face of the first lens barrel and the maximum height L2 of the second lens barrel satisfy the following relationship: 3.35 <D01s / L2<3.60。 8. The action camera lens according to claim 1, characterized in that, The second lens barrel includes an inner annular protrusion. The inner annular protrusion is disposed on a portion of the inner annular surface of the second lens barrel and protrudes in a direction close to the second optical axis. The inner annular protrusion has an object-side surface facing the object-side end face of the second lens barrel and an image-side surface facing the image-side end face of the second lens barrel. The inner diameter of the image-side surface of the inner annular protrusion is the minimum value of the inner diameter of the inner annular surface of the second lens barrel. The object-side surface of the inner annular protrusion contacts the image-side surface of the third lens and the image-side surface of the inner annular protrusion contacts the object-side surface of the fourth lens.

9. The action camera lens according to claim 8, characterized in that, The minimum inner diameter dQs of the protruding part of the inner annular surface, the effective diameter DT32 of the image side of the third lens, and the effective diameter DT41 of the object side of the fourth lens satisfy the following relationship: 1.85 <dQs / (DT32-DT41)<3.30。 10. The action camera lens according to any one of claims 1 to 8, characterized in that, The second group also includes a seventh spacer element located on the object side of the eighth lens and in contact with the object side surface of the eighth lens; The inner diameter d7s of the object-side surface of the seventh spacer element and the combined focal length f67 of the sixth and seventh lenses satisfy the following condition: -1.20 <d7s / f67≤-0.30。 11. The action camera lens according to any one of claims 1 to 8, characterized in that, The distance CPQ between the object-side surface and the image-side surface of the inner annular protrusion on the second optical axis, and the distance T34 between the image-side surface of the third lens and the object-side surface of the fourth lens on the second optical axis, satisfy the following condition: 0.

90. <CPQ / T34<1.80。 12. The action camera lens according to any one of claims 1 to 8, characterized in that, The second group also includes a seventh spacer element located on the object side of the eighth lens and in contact with the object side surface of the eighth lens; The radius of curvature R13 of the object-side surface of the eighth lens, the inner diameter d7m of the image-side surface of the seventh spacer element, and the outer diameter D7m of the image-side surface of the seventh spacer element satisfy the following condition: 3.10 <R13 / (D7m-d7m)<15.55。

Images