Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein the first lens has positive refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the sixth lens has positive refractive power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the eighth lens has negative refractive power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface; half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging lens is ImgH, and ImgH satisfies ImgH > 5.0 mm; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy f / EPD < 1.8; the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy -1.0 < f6 / (R11+R12) < 0, 7.0 mm < R11 < 17.0 mm and -1.0 < R11 / R12 < 0.

Description

Technical Field

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

[0002] In recent years, with the development of science and technology, portable electronic products such as mobile phones and tablet computers have become increasingly popular. People's requirements for mobile phone lenses have also become higher and higher, and mobile phone lenses with high imaging quality have been increasingly favored. However, due to the trend of portable electronic products towards miniaturization, the total length requirement for camera lenses has become increasingly strict, resulting in a reduction in the design freedom of the lens and an increase in the design difficulty. To meet the requirements of miniaturization, the F-number of mobile phone imaging lenses is basically above 2.0, and imaging systems with an F-number below 2.0 sometimes cannot meet the system requirements, and various performance indicators will deteriorate, and the aberration will also increase. Therefore, how to obtain high imaging quality and small aberration under the current conditions has also become a bottleneck that is difficult to break through. Summary of the Invention

[0003] This application provides an optical imaging lens, which sequentially includes, along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein, the first lens has a positive optical power, its object side is a convex surface, and its image side is a concave surface; the sixth lens has a positive optical power, its object side is a convex surface, and its image side is a convex surface; the eighth lens has a negative optical power, its object side is a concave surface, and its image side is a concave surface; half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfies: ImgH > 5.0 mm; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD < 1.8; and the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side of the sixth lens, and the curvature radius R12 of the image side of the sixth lens satisfy: -1.0 < f6 / (R11 + R12) < 0, 7.0 mm < R11 < 17.0 mm, and -1.0 < R11 / R12 < 0.

[0004] In one embodiment, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: CT2 + CT3 < CT5 and CT3 + CT4 < CT5.

[0005] In one embodiment, the image side of the fifth lens is a convex surface; and the curvature radius R10 of the image side of the fifth lens and the effective focal length f of the optical imaging lens satisfy: -5.0 < R10 / f < -1.0.

[0006] In an embodiment, the image side surface of the seventh lens is concave; and the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical imaging lens satisfy: 0.5 < R14 / f < 3.0.

[0007] In an embodiment, the effective focal length f1 of the first lens, the effective focal length f8 of the eighth lens, and the effective focal length f of the optical imaging lens satisfy: 0 < f / f1 < 1.0 and -1.0 < f8 / f < 0.

[0008] In an embodiment, 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: 0 < (R2 - R1) / (R2 + R1) < 1.0.

[0009] In an embodiment, the distance TTL from the object side surface of the first lens of the optical imaging lens to the imaging surface on the optical axis and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL / ImgH < 1.9.

[0010] In an embodiment, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the dispersion coefficient V3 of the third lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.0 < (V1×CT1) / (V2×CT2 + V3×CT3) < 3.5.

[0011] In an embodiment, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 11.0 < f345 / [(N3 + N4 + N5)×(T34 + T45)] < 21.0.

[0012] In an embodiment, the radius of curvature R14 of the image side surface of the seventh lens, the radius of curvature R15 of the object side surface of the eighth lens, the radius of curvature R16 of the image side surface of the eighth lens, and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.0 < f78 / (R14 + R15 + R16) < 0.

[0013] In an embodiment, the dispersion coefficient V5 of the fifth lens, the dispersion coefficient V6 of the sixth lens, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 1.0 < (V5 - V6)×(CT5 - CT6) / T56 < 7.0.

[0014] In one embodiment, the combined focal length f12 of the first lens and the second lens, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.5 <f12 / (R1+R4)<2.0。

[0015] In one embodiment, the axial distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, the axial distance SAG72 between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens, and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: -2.5 < (SAG71 + SAG72) / T67 < -1.5.

[0016] In one embodiment, the air gap T78 between the seventh and eighth lenses on the optical axis, the edge thickness ET7 of the seventh lens, and the edge thickness ET8 of the eighth lens satisfy: 0 <T78 / (ET7+ET8)<0.3。

[0017] In one embodiment, the combined focal length f12345 of the first lens, second lens, third lens, fourth lens, and fifth lens satisfies the condition ∑ET15, which is equal to the sum of the edge thicknesses of the first lens, second lens, third lens, and fourth lens: 4.0. <f12345 / ∑ET15<5.0。

[0018] In one embodiment, the maximum effective radius DT12 of the image-side surface of the first lens, the maximum effective radius DT22 of the image-side surface of the second lens, the maximum effective radius DT72 of the image-side surface of the seventh lens, and the maximum effective radius DT82 of the image-side surface of the eighth lens satisfy: 0 < (DT12 + DT22) / (DT72 + DT82) < 0.6.

[0019] In one embodiment, the average value of the maximum effective radius of the object-side surface of each of the sixth to eighth lenses, aveDT68, and the average value of the maximum effective radius of the object-side surface of each of the first to fifth lenses, aveDT15, satisfy: 1.0 mm. <aveDT68-aveDT15<1.6mm。

[0020] In one embodiment, the effective focal length f of the optical imaging lens, the maximum field of view (FOV) of the optical imaging system, and the radius of curvature R1 of the object-side surface of the first lens satisfy: 1.2 <f×tan(FOV / 2) / R1<1.7。

[0021] For the optical imaging lens proposed in this application, the optical powers and surface shapes of the first lens, the sixth lens, and the eighth lens are reasonably allocated, which can effectively balance the low-order aberrations of the system and can also control the overall system length to be as small as possible. At the same time, by controlling ImgH>5.0mm, f / EPD<1.8, -1.0<f6 / (R11+R12)<0, 7.0mm<R11<17.0mm, and -1.0<R11 / R12<0, the optical imaging lens realizes the characteristics of large aperture and large image plane. The larger the ImgH value, the larger the corresponding chip, and the better the imaging effect. f / EPD is the F-number of the optical imaging lens. The smaller this value, the larger the optical aperture, and the clearer the imaging. Controlling the radius of curvature of the sixth lens within a reasonable range can effectively converge the angle of the outgoing light rays, play a role in reducing the aberrations of the large image plane and large aperture imaging lens, reduce the influence of the sensitive position of the sixth lens on the overall lens, and thus improve the imaging quality. Brief Description of the Drawings

[0022] By reading the detailed description of the non-restrictive embodiments made with reference to the following drawings, other features, objects, and advantages of this application will become more obvious:

[0023] Figure 1 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of this application;

[0024] Figures 2A to 2D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 1;

[0025] Figure 3 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of this application;

[0026] Figures 4A to 4D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 2;

[0027] Figure 5 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of this application;

[0028] Figures 6A to 6D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 3;

[0029] Figure 7 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of this application;

[0030] Figures 8A to 8D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 4;

[0031] Figure 9 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown;

[0032] Figures 10A to 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 5 are shown respectively.

[0033] Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of this application is shown;

[0034] Figures 12A to 12D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 6 are shown respectively.

[0035] Figure 13 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown;

[0036] Figures 14A to 14D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 7 are shown respectively.

[0037] Figure 15 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown; and

[0038] Figures 16A to 16D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 8 are shown respectively. Detailed Implementation

[0039] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] 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.

[0041] 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 strictly to scale.

[0042] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the 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 the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0043] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] The features, principles and other aspects of this application are described in detail below.

[0047] An optical imaging lens according to an exemplary embodiment of the present application may include, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein, the first lens has a positive optical power, its object side is convex, and its image side is concave; the sixth lens has a positive optical power, its object side is convex, and its image side is convex; the eighth lens has a negative optical power, its object side is concave, and its image side is concave; half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens, ImgH, satisfies: ImgH > 5.0 mm; the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD < 1.8; the effective focal length f6 of the sixth lens, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy: -1.0 < f6 / (R11 + R12) < 0, 7.0 mm < R11 < 17.0 mm, and -1.0 < R11 / R12 < 0. In the present application, the optical powers and surface types of the first lens, the sixth lens, and the eighth lens are reasonably allocated, which can effectively balance the low-order aberrations of the system and can also control the overall system length to be as small as possible; at the same time, by controlling ImgH > 5.0 mm, f / EPD < 1.8, -1.0 < f6 / (R11 + R12) < 0, 7.0 mm < R11 < 17.0 mm, and -1.0 < R11 / R12 < 0, the optical imaging lens realizes the characteristics of large aperture and large image surface. The larger the ImgH value, the larger the corresponding chip, and the better the imaging effect; f / EPD is the F-number of the optical imaging lens. The smaller this value, the larger the optical aperture, and the clearer the imaging. Controlling the radius of curvature of the sixth lens within a reasonable range can effectively converge the angle of the outgoing light, play a role in reducing the aberrations of the large image surface and large aperture imaging lens, and reduce the influence of the sensitive position of the sixth lens on the overall lens, thereby improving the imaging quality.

[0048] In an exemplary embodiment, the optical imaging lens further includes an aperture disposed on the object side surface of the first lens.

[0049] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: CT2 + CT3 < CT5 and CT3 + CT4 < CT5, where CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. Satisfying CT2 + CT3 < CT5 and CT3 + CT4 < CT5 can effectively control the step difference of the front-stage lenses, make the light transition smoothly, and greatly improve the processability.

[0050] In an exemplary embodiment, the image side of the fifth lens of the optical imaging lens according to the present application is convex and satisfies: -5.0 < R10 / f < -1.0, where R10 is the radius of curvature of the image side of the fifth lens, and f is the effective focal length of the optical imaging lens. By satisfying -5.0 < R10 / f < -1.0 and restricting the ratio of the radius of curvature of the image side of the fifth lens to the effective focal length of the optical imaging lens, the optical power of the overall system can be effectively distributed, the incident angle of light can be reduced, and thus spherical aberration and off-axis aberration can be reduced, playing a role in improving image quality.

[0051] In an exemplary embodiment, the image side of the seventh lens of the optical imaging lens according to the present application is concave and satisfies: 0.5 < R14 / f < 3.0, where R14 is the radius of curvature of the image side of the seventh lens, and f is the effective focal length of the optical imaging lens. By satisfying 0.5 < R14 / f < 3.0 and restricting the ratio of the radius of curvature of the image side of the seventh lens to the effective focal length of the optical imaging lens, the optical power of the overall system can be effectively distributed, the incident angle of light can be reduced, and spherical aberration and off-axis aberration can be reduced simultaneously.

[0052] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < f / f1 < 1.0 and -1.0 < f8 / f < 0, where f1 is the effective focal length of the first lens, f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical imaging lens. By satisfying 0 < f / f1 < 1.0 and -l.0 < f8 / f < 0, the optical power of the system can be reasonably distributed, the system can have good imaging quality, and the sensitivity of the system can be effectively reduced, ensuring the stability of assembly and improving the yield.

[0053] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < (R2 - R1) / (R2 + R1) < 1.0, where R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens. By satisfying 0 < (R2 - R1) / (R2 + R1) < 1.0, the deflection angle of the system light beam in the first lens can be effectively controlled, the sensitivity of the system can be effectively reduced, and good processing characteristics can be achieved.

[0054] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: TTL / ImgH < 1.9, where TTL is the distance from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface. By satisfying TTL / ImgH < 1.9 and controlling the ratio of TTL to ImgH, the size of the system is effectively compressed, and the ultra-thin characteristics of the lens are ensured to meet the requirements of miniaturization of the imaging system.

[0055] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.0 < (V1 × CT1) / (V2 × CT2 + V3 × CT3) < 3.5, where V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, V3 is the dispersion coefficient of the third lens, CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. Satisfying 1.0 < (V1 × CT1) / (V2 × CT2 + V3 × CT3) < 3.5 can constrain the chromatic aberration of the first lens, the second lens, and the third lens, and perform chromatic aberration compensation by using the dispersion coefficient differences of different materials, thereby reducing the influence of the first three lenses on the overall chromatic aberration of the lens.

[0056] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 11.0 < f345 / [(N3 + N4 + N5) × (T34 + T45)] < 21.0, where N3 is the refractive index of the third lens, N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and f345 is the combined focal length of the third lens, the fourth lens, and the fifth lens. Satisfying 11.0 < f345 / [(N3 + N4 + N5) × (T34 + T45)] < 21.0 can reasonably distribute the optical power of the system, enable the system to have good imaging quality and effectively reduce the sensitivity of the system, and play a role in improving the product yield.

[0057] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -1.0 < f78 / (R14 + R15 + R16) < 0, where R14 is the radius of curvature of the image side of the seventh lens, R15 is the radius of curvature of the object side of the eighth lens, R16 is the radius of curvature of the image side of the eighth lens, and f78 is the combined focal length of the seventh lens and the eighth lens. Satisfying -1.0 < f78 / (R14 + R15 + R16) < 0 can effectively control the deflection angle of the system light beam in the seventh lens and the eighth lens, and further increase the focal length of the system, playing a role in increasing the image height.

[0058] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.0 < (V5 - V6)×(CT5 - CT6) / T56 < 7.0, where V5 is the dispersion coefficient of the fifth lens, V6 is the dispersion coefficient of the sixth lens, CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. Satisfying 1.0 < (V5 - V6)×(CT5 - CT6) / T56 < 7.0 can constrain the chromatic aberration of the fifth lens and the sixth lens, and perform chromatic aberration compensation through the difference in the dispersion coefficients of different materials, thereby reducing the influence of the first three lenses on the overall chromatic aberration of the lens.

[0059] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0.5 < f12 / (R1 + R4) < 2.0, where f12 is the combined focal length of the first lens and the second lens, R1 is the curvature radius of the object side surface of the first lens, and R4 is the curvature radius of the image side surface of the second lens. Satisfying 0.5 < f12 / (R1 + R4) < 2.0 can reasonably utilize the front-segment lens to preliminarily control the light entering the system, and further control the astigmatism of the system and improve the imaging quality of the off-axis field.

[0060] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -2.5 < (SAG71 + SAG72) / T67 < -1.5, where SAG71 is the axial distance between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, SAG72 is the axial distance between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis. If the value of (SAG71 + SAG72) / T67 is too large, it will increase the assembly difficulty of the seventh lens; if it is too small, it will cause the axial length of the gap between the two lenses to be too large. Controlling the conditional formula (SAG71 + SAG72) / T67 within a reasonable range is beneficial to better balance and achieve miniaturization of the module.

[0061] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0 < T78 / (ET7 + ET8) < 0.3, where T78 is the air gap between the seventh lens and the eighth lens on the optical axis, ET7 is the edge thickness of the seventh lens, and ET8 is the edge thickness of the eighth lens. If the value of T78 / (ET7 + ET8) is too large, it will cause the edge thicknesses of the seventh and eighth lenses to be too thin, easily triggering molding risks; if it is too small, it will cause the gap between the seventh and eighth lenses to be too small, easily resulting in collisions. Controlling T78 / (ET7 + ET8) within a certain range can reduce the sensitivity of the lens and improve the processability.

[0062] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 4.0 < f12345 / ∑ET15 < 5.0, where f12345 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, and ∑ET15 is the sum of the edge thicknesses of the first lens, the second lens, the third lens, and the fourth lens. Satisfying 4.0 < f12345 / ∑ET15 < 5.0 is beneficial to better balance and achieve miniaturization of the module.

[0063] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0 < (DT12 + DT22) / (DT72 + DT82) < 0.6, where DT12 is the maximum effective radius of the image side of the first lens, DT22 is the maximum effective radius of the image side of the second lens, DT72 is the maximum effective radius of the image side of the seventh lens, and DT82 is the maximum effective radius of the image side of the eighth lens. Satisfying 0 < (DT12 + DT22) / (DT72 + DT82) < 0.6 can effectively control the step difference of the entire lens, enable smooth transition of light, greatly improve the processability of the first lens, the second lens, the seventh lens, and the eighth lens, and reduce aberration.

[0064] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.0 mm < aveDT68 - aveDT15 < 1.6 mm, where aveDT68 is the average value of the maximum effective radii of the object sides of the lenses from the sixth lens to the eighth lens, and aveDT15 is the average value of the maximum effective radii of the object sides of the lenses from the first lens to the fifth lens. Satisfying 1.0 mm < aveDT68 - aveDT15 < 1.6 mm can effectively control the step difference of the entire lens, enable smooth transition of light, and improve the processability.

[0065] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.2 < f × tan(FOV / 2) / R1 < 1.7, where f is the effective focal length of the optical imaging lens, FOV is the maximum field angle of the optical imaging system, and R1 is the curvature radius of the object side of the first lens. If the value of f × tan(FOV / 2) / R1 is too large, it will result in insufficient diopter of the first lens; if it is too small, it will result in insufficient field angle and image height. Satisfying 1.2 < f × tan(FOV / 2) / R1 < 1.7 can ensure a sufficiently large image height and excellent imaging quality.

[0066] In an exemplary embodiment, at least one of the mirror surfaces of each of the first to eighth lenses is an aspherical mirror surface. This application does not specifically limit the number of spherical and aspherical lenses; if image resolution is a primary concern, all lenses can be aspherical. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. A spherical lens, on the other hand, has a constant curvature from its center to its periphery. Aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, the object-side and image-side surfaces of each of the first to eighth lenses are aspherical mirror surfaces.

[0067] In an exemplary embodiment, the effective focal length f1 of the first lens can be, for example, in the range of 7.6mm to 18.8mm; the effective focal length f2 of the second lens can be, for example, in the range of -14.5mm to 25.5mm; the effective focal length f3 of the third lens can be, for example, in the range of -29.0mm to 9.0mm; the effective focal length f4 of the fourth lens can be, for example, in the range of -9.5mm to 12.5mm; the effective focal length f5 of the fifth lens can be, for example, in the range of -11.0mm to 90.0mm; the effective focal length f6 of the sixth lens can be, for example, in the range of 9.5mm to 12.5mm; the effective focal length f7 of the seventh lens can be, for example, in the range of -23.0mm to 68.0mm; and the effective focal length f8 of the eighth lens can be, for example, in the range of -7.0mm to -3.5mm. The effective focal length f of the optical imaging lens can be, for example, in the range of 7.0mm to 8.0mm; exemplaryly, f is 7.5mm. The image height (ImgH) corresponding to the maximum field of view of the optical imaging lens can be, for example, in the range of 5.0 mm to 7.0 mm. The maximum field of view (FOV) of the optical imaging lens can be, for example, in the range of 70° to 90°. The distance (TTL) on the optical axis from the object side of the first lens to the imaging plane of the optical imaging lens can be, for example, in the range of 9.0 mm to 10.0 mm; exemplarily, the TTL is 9.80 mm.

[0068] In an exemplary embodiment, the optical imaging lens according to this application further includes a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0069] This application proposes an optical imaging lens with characteristics such as a large field of view, high pixel count, miniaturization, and high image quality. The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, incident light rays can be effectively converged, the overall optical length of the optical imaging lens can be reduced, and the manufacturability of the optical imaging lens can be improved, making the optical imaging lens more conducive to manufacturing. However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0070] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0071] Example 1

[0072] The following is for reference Figures 1 to 2D Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown.

[0073] like Figure 1 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0074] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0075] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0076]

[0077] Table 1

[0078] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0079]

[0080] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A16, A26, A36, A47, A68, A166 that can be used for each aspherical mirror S1-S16 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0081]

[0082]

[0083] Table 2

[0084] Table 3 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 1, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0085] Basic Data / Example 1 f(mm) 7.50 TTL(mm) 9.80 ImgH(mm) 6.15 FOV (°) 80.0 f / EPD 1.70 ET7 (mm) 1.72 ET8 (mm) 0.27 SAG71 (mm) -2.42 SAG72 (mm) -0.98 DT12 (mm) 2.15 DT22(mm) 1.96 DT72 (mm) 4.49 DT82 (mm) 4.84 aveDT15(mm) 2.26 aveDT68(mm) 3.67 ∑ET15(mm) 1.98 f12 (mm) 16.28 f78(mm) -4.78 f345(mm) 14.69 f12345(mm) 8.85

[0086] Table 3

[0087] Figure 2A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 2A to 2D It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0088] Example 2

[0089] The following is for reference Figures 3 to 4D This paper describes an optical imaging lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0090] like Figure 3 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0091] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0092] Table 4 shows the basic parameters of the optical imaging lens of Example 2, where the units for radius of curvature, thickness / distance, and effective focal length are millimeters (mm). Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, where each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0093]

[0094] Table 4

[0095]

[0096]

[0097] Table 5

[0098] Table 6 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 2, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0099] Basic Data / Example 2 f(mm) 7.50 TTL(mm) 9.80 ImgH(mm) 5.39 FOV (°) 72.00 f / EPD 1.61 ET7 (mm) 1.59 ET8 (mm) 0.32 SAG71 (mm) -2.02 SAG72 (mm) -0.70 DT12 (mm) 2.27 DT22(mm) 2.06 DT72 (mm) 4.08 DT82 (mm) 4.35 aveDT15(mm) 2.30 aveDT68(mm) 3.40 ∑ET15(mm) 2.08 f12 (mm) 16.17 f78(mm) -4.84 f345(mm) 15.00 f12345(mm) 8.91

[0100] Table 6

[0101] Figure 4A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4A to 4D It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following is for reference Figures 5 to 6D An optical imaging lens according to Embodiment 3 of this application is described. Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0104] like Figure 5 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0105] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0106] Table 7 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0107]

[0108] Table 7

[0109]

[0110] Table 8

[0111] Table 9 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 3, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0112] Basic Data / Example 3 f(mm) 7.50 TTL(mm) 9.80 ImgH(mm) 6.54 FOV (°) 84.00 f / EPD 1.61 ET7 (mm) 1.70 ET8 (mm) 0.25 SAG71 (mm) -2.64 SAG72 (mm) -1.20 DT12 (mm) 2.27 DT22(mm) 2.07 DT72 (mm) 4.68 DT82 (mm) 5.18 aveDT15(mm) 2.33 aveDT68(mm) 3.83 ∑ET15(mm) 1.94 f12 (mm) 16.29 f78(mm) -4.85 f345(mm) 15.01 f12345(mm) 8.92

[0113] Table 9

[0114] Figure 6A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6DThe magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6A to 6D It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0115] Example 4

[0116] The following is for reference Figures 7 to 8D An optical imaging lens according to Embodiment 4 of this application is described. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown.

[0117] like Figure 7 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0118] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0119] Table 10 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 11 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0120]

[0121] Table 10

[0122]

[0123] Table 11

[0124] Table 12 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 4, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0125] Basic Data / Example 4 f(mm) 7.50 TTL(mm) 9.80 ImgH(mm) 6.21 FOV (°) 80.00 f / EPD 1.61 ET7 (mm) 1.55 ET8 (mm) 0.27 SAG71 (mm) -2.43 SAG72 (mm) -1.15 DT12 (mm) 2.27 DT22(mm) 2.10 DT72 (mm) 4.44 DT82 (mm) 4.81 aveDT15(mm) 2.32 aveDT68(mm) 3.58 ∑ET15(mm) 2.13 f12 (mm) 18.48 f78(mm) -5.26 f345(mm) 13.62 f12345(mm) 8.86

[0126] Table 12

[0127] Figure 8A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 8B The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8A to 8D It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0128] Example 5

[0129] The following is for reference Figures 9 to 10D An optical imaging lens according to Embodiment 5 of this application is described. Figure 9 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown.

[0130] like Figure 9 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0131] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0132] Table 13 shows the basic parameters of the optical imaging lens of Example 5, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 14 shows the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133]

[0134]

[0135] Table 13

[0136]

[0137] Table 14

[0138] Table 15 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 5, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0139] Basic Data / Example 5 f(mm) 7.50 TTL(mm) 9.80 ImgH(mm) 6.20 FOV (°) 80.00 f / EPD 1.61 ET7 (mm) 1.53 ET8 (mm) 0.25 SAG71 (mm) -2.49 SAG72 (mm) -1.23 DT12 (mm) 2.27 DT22(mm) 2.04 DT72 (mm) 4.44 DT82 (mm) 4.80 aveDT15(mm) 2.34 aveDT68(mm) 3.65 ∑ET15(mm) 1.98 f12 (mm) 14.89 f78(mm) -5.29 f345(mm) 18.80 f12345(mm) 9.43

[0140] Table 15

[0141] Figure 10A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 10B The astigmatism curve of the optical imaging lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 10DThe magnification chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 10A to 10D It can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0142] Example 6

[0143] The following is for reference Figures 11 to 12D An optical imaging lens according to Embodiment 6 of this application is described. Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of this application is shown.

[0144] like Figure 11 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0145] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0146] Table 16 shows the basic parameters of the optical imaging lens of Example 6, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 17 shows the higher-order coefficients that can be used for each aspherical mirror in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0147]

[0148]

[0149] Table 16

[0150]

[0151] Table 17

[0152] Table 18 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 6, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens (ImgH), and the maximum field of view (FOV) of the optical imaging lens.

[0153]

[0154]

[0155] Table 18

[0156] Figure 12A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 6 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 12B The astigmatism curve of the optical imaging lens of Embodiment 6 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 12D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 6 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 12A to 12D It can be seen that the optical imaging lens given in Example 6 can achieve good imaging quality.

[0157] Example 7

[0158] The following is for reference Figures 13 to 14D An optical imaging lens according to Embodiment 7 of this application is described. Figure 13 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown.

[0159] like Figure 13 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0160] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0161] Table 19 shows the basic parameters of the optical imaging lens of Example 7, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 20 shows the higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0162]

[0163]

[0164] Table 19

[0165]

[0166] Table 20

[0167] Table 21 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 7, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0168]

[0169]

[0170] Table 21

[0171] Figure 14A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 14B The astigmatism curve of the optical imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14CThe distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 14D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 14A to 14D It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0172] Example 8

[0173] The following is for reference Figures 15 to 16D An optical imaging lens according to Embodiment 8 of this application is described. Figure 15 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown.

[0174] like Figure 15 As shown, the optical imaging lens includes, from the object side to the image side, an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S17.

[0175] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes through surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0176] Table 22 shows the basic parameters of the optical imaging lens of Example 8, wherein the units of radius of curvature, thickness / distance and effective focal length are millimeters (mm). Table 23 shows the higher-order coefficients that can be used for each aspherical mirror in Example 8, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0177]

[0178]

[0179] Table 22

[0180]

[0181] Table 23

[0182] Table 24 provides data on parameters such as the effective focal length f of the optical imaging lens in Example 8, the distance TTL from the object side of the first lens of the optical imaging lens to the imaging surface on the optical axis, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH, and the maximum field of view FOV of the optical imaging lens.

[0183]

[0184]

[0185] Table 24

[0186] Figure 16A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 8 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 16B The astigmatism curve of the optical imaging lens of Embodiment 8 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16C The distortion curve of the optical imaging lens of Example 8 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 16D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 8 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 16A to 16D It can be seen that the optical imaging lens given in Example 8 can achieve good imaging quality.

[0187] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 25.

[0188] Conditional / Example 1 2 3 4 5 6 7 8 f6 / (R11+R12) -0.23 -0.33 -0.80 -0.80 -0.61 -0.97 -0.31 -0.15 R11 / R12 -0.17 -0.23 -0.46 -0.46 -0.37 -0.52 -0.22 -0.11 R10 / f -2.62 -2.67 -2.52 -2.07 -2.62 -1.74 -2.58 -2.27 R14 / f 2.00 2.05 1.29 2.00 0.54 1.32 2.03 2.46 f / f1 0.97 0.98 0.92 0.91 0.95 0.40 0.97 0.97 f8 / f -0.55 -0.55 -0.53 -0.64 -0.92 -0.53 -0.55 -0.51 (R2-R1) / (R2+R1) 0.88 0.89 0.80 0.76 0.83 0.21 0.87 0.84 TTL / ImgH 1.59 1.82 1.50 1.58 1.58 1.60 1.58 1.57 (V1×CT1) / (V2×CT2+V3×CT3) 2.95 3.22 3.26 1.95 3.18 1.38 3.26 3.26 f345 / [(N3+N4+N5)×(T34+T45)] 12.74 12.48 14.19 15.71 17.64 20.93 12.62 15.13 f78 / (R14+R15+R16) -0.27 -0.27 -0.33 -0.32 -0.62 -0.63 -0.27 -0.25 (V5-V6)×(CT5-CT6) / T56 6.10 6.23 6.33 5.54 2.20 3.18 6.07 5.95 f12 / (R1+R4) 1.54 1.50 1.48 1.24 1.50 0.54 1.49 1.45 (SAG71+SAG72) / T67 -2.13 -1.71 -2.38 -2.24 -2.26 -2.15 -2.18 -2.15 T78 / (ET7+ET8) 0.14 0.14 0.14 0.16 0.17 0.11 0.14 0.13 f12345 / ∑ET15 4.46 4.28 4.61 4.16 4.76 4.77 4.47 4.46 (DT12+DT22) / (DT72+DT82) 0.44 0.51 0.44 0.47 0.47 0.47 0.46 0.45 aveDT68-aveDT15 1.41 1.10 1.50 1.26 1.31 1.38 1.36 1.42 f×tan(FOV / 2) / R1 1.57 1.36 1.67 1.58 1.57 1.65 1.58 1.59

[0189] Table 25

[0190] This application also provides an imaging device, wherein the 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 optical imaging lens described above.

[0191] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, In order from the object side to the image side along the optical axis, the optical imaging lens comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; wherein The first lens has positive refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; The image side surface of the second lens is a concave surface; The object side surface of the third lens is a convex surface; The image side surface of the fifth lens is a convex surface; The sixth lens has positive refractive power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; The image side surface of the seventh lens is a concave surface; The eighth lens has negative refractive power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface; The number of lenses with refractive power in the optical imaging lens is eight; Half the length of the diagonal of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfies: 5.39mm≤ImgH≤6.54mm; The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 1.61≤f / EPD<1.8; and The effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.0<f6 / (R11+R12)≤-0.15, 8.7482mm≤R11≤13.3134mm and -0.52≤R11 / R12≤-0.11; The dispersion coefficient V5 of the fifth lens, the dispersion coefficient V6 of the sixth lens, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis and the air gap T56 of the fifth lens and the sixth lens on the optical axis satisfy: 2.20≤(V5-V6)×(CT5-CT6) / T56≤6.33; The second lens has negative refractive power, the third lens and the fourth lens have opposite positive and negative refractive powers, and the fifth lens and the seventh lens both have positive refractive power; or The second lens, the third lens, the fifth lens and the seventh lens all have negative refractive power, and the fourth lens has positive refractive power; or The second lens, the fourth lens, the fifth lens and the seventh lens all have positive refractive power, and the third lens has negative refractive power.

2. The optical imaging lens according to claim 1, wherein, The central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: CT2+CT3<CT5 and CT3+CT4<CT5.

3. The optical imaging lens according to claim 1, wherein The curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical imaging lens satisfy: -2.67≤R10 / f≤-1.

74.

4. The optical imaging lens according to claim 1, wherein The curvature radius R14 of the image side surface of the seventh lens and the effective focal length f of the optical imaging lens satisfy: 0.5<R14 / f≤2.

46.

5. The optical imaging lens according to claim 1, wherein, An effective focal length f1 of the first lens, an effective focal length f8 of the eighth lens and an effective focal length f of the optical imaging lens satisfy: 0.40≤f / f1<1.0 and -0.92≤f8 / f≤-0.

51.

6. The optical imaging lens according to claim 1, wherein, A radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: 0.21≤(R2-R1) / (R2+R1)≤0.

89.

7. The optical imaging lens according to claim 1, wherein, A distance TTL from an object side surface of the first lens of the optical imaging lens to the imaging surface on the optical axis and a half of a diagonal line length of an effective pixel area on the imaging surface ImgH satisfy: 1.50≤TTL / ImgH≤1.

82.

8. The optical imaging lens according to claim 1, wherein, A dispersion coefficient V1 of the first lens, a dispersion coefficient V2 of the second lens, a dispersion coefficient V3 of the third lens, a central thickness CT1 of the first lens on the optical axis, a central thickness CT2 of the second lens on the optical axis and a central thickness CT3 of the third lens on the optical axis satisfy: 1.38≤(V1×CT1) / (V2×CT2+V3×CT3)≤3.

26.

9. The optical imaging lens according to claim 1, wherein, A refractive index N3 of the third lens, a refractive index N4 of the fourth lens, a refractive index N5 of the fifth lens, an air separation T34 of the third lens and the fourth lens on the optical axis, an air separation T45 of the fourth lens and the fifth lens on the optical axis, a combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 12.48≤f345 / [(N3+N4+N5)×(T34+T45)]≤20.

93.

10. The optical imaging lens according to claim 1, wherein, A radius of curvature R14 of an image side surface of the seventh lens, a radius of curvature R15 of an object side surface of the eighth lens, a radius of curvature R16 of an image side surface of the eighth lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -0.63≤f78 / (R14+R15+R16)≤-0.

25.

11. The optical imaging lens according to any of claims 1 to 10, wherein, A combined focal length f12 of the first lens and the second lens, a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.5<f12 / (R1+R4)≤1.

54.

12. The optical imaging lens according to any of claims 1 to 10, wherein, An on-axis distance SAG71 between an intersection of an object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens, an on-axis distance SAG72 between an intersection of an image side surface of the seventh lens and the optical axis and an effective radius vertex of the image side surface of the seventh lens and an air separation T67 of the sixth lens and the seventh lens on the optical axis satisfy: -2.38≤(SAG71+SAG72) / T67≤-1.

71.

13. The optical imaging lens according to any of claims 1 to 10, wherein, An air separation T78 of the seventh lens and the eighth lens on the optical axis, an edge thickness ET7 of the seventh lens and an edge thickness ET8 of the eighth lens satisfy: 0.11≤T78 / (ET7+ET8)≤0.

17.

14. The optical imaging lens according to any of claims 1 to 10, wherein, A combination focal length f12345 of the first lens, the second lens, the third lens, the fourth lens and the fifth lens and a sum ∑ET15 of an edge thickness of the first lens, an edge thickness of the second lens, an edge thickness of the third lens and an edge thickness of the fourth lens satisfy: 4.16≤f12345 / ∑ET15≤4.

77.

15. The optical imaging lens according to any of claims 1 to 10, wherein, A maximum effective radius DT12 of an image side surface of the first lens, a maximum effective radius DT22 of an image side surface of the second lens, a maximum effective radius DT72 of an image side surface of the seventh lens and a maximum effective radius DT82 of an image side surface of the eighth lens satisfy: 0.44≤(DT12+DT22) / (DT72+DT82)≤0.

51.

16. The optical imaging lens according to any of claims 1 to 10, wherein, An average value aveDT68 of a maximum effective radius of an object side surface of each lens of the sixth lens to the eighth lens and an average value aveDT15 of a maximum effective radius of an object side surface of each lens of the first lens to the fifth lens satisfy: 1.10mm≤aveDT68-aveDT15≤1.50mm.

17. The optical imaging lens according to any of claims 1 to 10, wherein, An effective focal length f of the optical imaging lens, a maximum field of view angle FOV of the optical imaging system and a curvature radius R1 of an object side surface of the first lens satisfy: 1.36≤f×tan(FOV / 2) / R1<1.7.

Images