An optical imaging lens

Abstract

The present invention discloses an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a diaphragm; a first lens having a focal power; a second lens having a negative focal power; a third lens having a focal power; a fourth lens having a focal power; a fifth lens having a negative focal power; a sixth lens having a focal power; a seventh lens having a focal power; and an eighth lens having a focal power; wherein, the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: 2.0 < SAG21 / SAG31 < 3.0. Reasonably adjusting the sag heights of the second lens and the third lens can effectively reduce the risk of ghosts in the second and third lenses, and will contribute to the overall size compression of the camera lens group.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and particularly relates to an optical imaging lens including eight lenses. Background Art

[0002] With the increasing powerful camera function of smart phones, people's demand for using mobile phones for photography has also expanded, adding many application scenarios that were not covered by previous mobile phone lenses, such as optical zoom, large image plane, ultra-wide angle, high-definition portrait, etc., especially the demand for high-definition portrait lenses.

[0003] Based on this strong demand orientation, the present invention proposes an optical imaging lens composed of eight lenses, which meets the requirements of small size, large aperture, and large image plane. Summary of the Invention

[0004] The present invention aims to provide an optical imaging lens composed of eight lenses, which has the characteristics of small size, large aperture, and large image plane.

[0005] The present application provides an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis:

[0006] A diaphragm;

[0007] A first lens with a focal power;

[0008] A second lens with a negative focal power;

[0009] A third lens with a focal power;

[0010] A fourth lens with a focal power, whose object side is concave and image side is convex;

[0011] A fifth lens with a negative focal power, whose object side is convex and image side is concave;

[0012] A sixth lens with a focal power, whose object side is concave and image side is convex;

[0013] A seventh lens with a focal power;

[0014] An eighth lens with a focal power;

[0015] Wherein, the axial distance SAG21 between the intersection point of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens and the axial distance SAG31 between the intersection point of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens satisfy: 2.0 < SAG21 / SAG31 < 3.0.

[0016] According to an embodiment of the present application, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: TTL / ImgH < 1.3.

[0017] According to an embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD < 2.0.

[0018] According to an embodiment of the present application, half of the maximum field of view angle of the optical imaging system, Semi-FOV, satisfies: Semi-FOV > 40°.

[0019] According to an embodiment of the present application, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 2.5 < (R6 + R5) / (R6 - R5) < 5.5.

[0020] According to an embodiment of the present application, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, satisfies: ImgH > 8.0 mm.

[0021] According to an embodiment of the present application, the curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: -4.5 < (R6 - R7) / (R6 + R7) < -1.0.

[0022] According to an embodiment of the present application, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 2.5 < (SAG11 + SAG22) / (SAG11 - SAG22) < 6.5.

[0023] According to an embodiment of the present application, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens and the on-axis distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: -4.0 < (SAG52 - SAG61) / (SAG52 + SAG61) < -2.0.

[0024] According to an embodiment of the present application, the sum of the central thicknesses of all lenses on the optical axis, ∑CT, and the central thickness CT2 of the second lens on the optical axis satisfy: 13.5 < ∑CT / CT2 ≤ 16.

[0025] According to an embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture stop to the image side surface of the last lens satisfy: 1.0 < TTL / SD < 1.5.

[0026] According to an embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1 - V2 > 30.

[0027] According to an embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V4 of the fourth lens satisfy: V1 - V4 < 20.

[0028] The present application provides an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis:

[0029] A diaphragm;

[0030] A first lens with a focal power;

[0031] A second lens with a negative focal power;

[0032] A third lens with a focal power;

[0033] A fourth lens with a focal power, having a concave object side surface and a convex image side surface;

[0034] A fifth lens with a negative focal power, having a convex object side surface and a concave image side surface;

[0035] A sixth lens with a focal power, having a concave object side surface and a convex image side surface;

[0036] A seventh lens with a focal power;

[0037] An eighth lens with a focal power;

[0038] Wherein, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 2.5 < (R6 + R5) / (R6 - R5) < 5.5.

[0039] According to an embodiment of the present application, half of the diagonal length of the effective pixel region on the imaging surface ImgH and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: TTL / ImgH < 1.3.

[0040] According to an embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD < 2.0.

[0041] According to an embodiment of the present application, half of the maximum field of view of the optical imaging system Semi-FOV satisfies: Semi-FOV > 40°.

[0042] According to an embodiment of the present application, the axial distance SAG21 between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the axial distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: 2.0 < SAG21 / SAG31 < 3.0.

[0043] According to an embodiment of the present application, half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfies: ImgH > 8.0 mm.

[0044] According to an embodiment of the present application, the radius of curvature R6 of the image side surface of the third lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: -4.5 < (R6 - R7) / (R6 + R7) < -1.0.

[0045] According to an embodiment of the present application, the axial distance SAG11 between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the axial distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 2.5 < (SAG11 + SAG22) / (SAG11 - SAG22) < 6.5.

[0046] According to an embodiment of the present application, the axial distance SAG52 between the intersection point of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens and the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: -4.0 < (SAG52 - SAG61) / (SAG52 + SAG61) < -2.0.

[0047] According to an embodiment of the present application, the sum of the central thicknesses of all lenses on the optical axis, ∑CT and the central thickness CT2 of the second lens on the optical axis satisfy: 13.5 < ∑CT / CT2 ≤ 16.

[0048] According to an embodiment of the present application, the axial distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture stop to the image side surface of the last lens satisfy: 1.0 < TTL / SD < 1.5.

[0049] According to an embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1 - V2 > 30.

[0050] According to an embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V4 of the fourth lens satisfy: V1 - V4 < 20.

[0051] Advantages of the present invention:

[0052] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the eighth lens. Constraining the effective focal lengths of the respective lenses of the optical system ensures the characteristics of a large image plane and ultra-thinness of the camera lens; constraining the positive and negative directions of the curvatures of the fourth and fifth lenses can reasonably control the distortion of the system, and at the same time enable the system to have good shooting performance, ensuring the high image quality characteristics of the system. Reasonably adjusting the sag heights of the second lens and the third lens can effectively reduce the risk of ghosts of the second and third lenses, and will contribute to the compression of the overall size of the camera lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0054] Figure 1 Schematic diagram of the lens group structure of Embodiment 1 of the optical imaging lens of the present invention;

[0055] Figures 2a to 2d Respectively, the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 1 of the optical imaging lens of the present invention;

[0056] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0057] Figures 4a to 4d Respectively, the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 2 of the optical imaging lens of the present invention;

[0058] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0059] Figures 6a to 6d Respectively, the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 3 of the optical imaging lens of the present invention;

[0060] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0061] Figures 8a to 8d Respectively, the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 4 of the optical imaging lens of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0063] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0064] It should also be understood that the terms "comprising", "including", "having", "containing", and / or "including" when used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0065] In the drawings, for the sake of clarity, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustration only and are not drawn to an exact scale.

[0066] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0067] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal manner unless expressly so defined herein.

[0068] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0069] Exemplary Embodiment

[0070] The optical imaging lens according to the exemplary embodiment of the present invention includes eight lenses, which are sequentially arranged 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. Among them, each lens is independent of each other, and there is an air gap between each lens on the optical axis.

[0071] The present exemplary embodiment provides an optical imaging lens, which sequentially includes along the optical axis from the object side to the image side: a diaphragm; a first lens having a focal power; a second lens having a negative focal power; a third lens having a focal power; a fourth lens having a focal power, the object side surface of which is concave and the image side surface of which is convex; a fifth lens having a negative focal power, the object side surface of which is convex and the image side surface of which is concave; a sixth lens having a focal power, the object side surface of which is concave and the image side surface of which is convex; a seventh lens having a focal power; and an eighth lens having a focal power. Constraining the effective focal lengths of the respective lenses of the optical system ensures the characteristics of a large image plane and ultra-thinness of the camera lens; constraining the positive and negative directions of the curvatures of the fourth and fifth lenses can reasonably control the distortion of the system, and at the same time enable the system to have good shooting performance, ensuring the high image quality characteristics of the system.

[0072] In the present exemplary embodiment, the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: 2.0 < SAG21 / SAG31 < 3.0. Reasonably adjusting the sag heights of the second lens and the third lens can effectively reduce the risk of ghosts of the second and third lenses, and will contribute to the overall size compression of the optical imaging lens. More specifically, the axial distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: 2.30 < SAG21 / SAG31 < 2.55.

[0073] In this exemplary embodiment, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: TTL / ImgH < 1.3. This ensures that the overall optical length of the entire optical imaging lens is limited to a certain size, enabling the optical imaging lens to have an ultra-thin characteristic. More specifically, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: TTL / ImgH < 1.25.

[0074] In this exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD < 2.0. This can ensure that the optical imaging lens has a larger aperture, increasing the amount of light entering the optical imaging lens and meeting the usage requirements in a dark environment. More specifically, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD ≤ 1.99.

[0075] In this exemplary embodiment, half of the maximum field of view angle of the optical imaging system, Semi-FOV, satisfies: Semi-FOV > 40°. This ensures that the optical imaging lens can obtain a wider imaging range, with a field of view angle greater than 80 degrees. More specifically, half of the maximum field of view angle of the optical imaging system, Semi-FOV, satisfies: Semi-FOV > 43°.

[0076] In this exemplary embodiment, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 2.5 < (R6 + R5) / (R6 - R5) < 5.5. By restricting the range of the object side curvature radius and the image side curvature radius of the third lens, the contribution rate of coma of the third lens is controlled within a reasonable range, and thus the coma generated by the system lenses can be well balanced, obtaining good off-axis field imaging quality. More specifically, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 2.70 < (R6 + R5) / (R6 - R5) < 5.4.

[0077] In this exemplary embodiment, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, satisfies: ImgH > 8.0 mm. This ensures that the optical imaging lens has a relatively large imaging range. More specifically, half of the diagonal length of the effective pixel region on the imaging surface, ImgH, satisfies: ImgH > 8.20 mm.

[0078] In the present exemplary embodiment, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.5 < (R6 - R7) / (R6 + R7) < -1.0. By constraining the relationship between the radius of curvature of the image-side surface of the third lens and the radius of curvature of the object-side surface of the fourth lens, the third lens of the camera lens has a more reasonable shape, reasonably bears the system optical power, and balances the aberration generated by the subsequent lenses; at the same time, the secondary reflection ghosting generated between the third lens and the fourth lens is weakened. More specifically, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.40 < (R6 - R7) / (R6 + R7) < -1.30.

[0079] In the present exemplary embodiment, the axial distance SAG11 between the intersection of the object-side surface of the first lens and the optical axis and the vertex of the effective radius of the object-side surface of the first lens and the axial distance SAG22 between the intersection of the image-side surface of the second lens and the optical axis and the vertex of the effective radius of the image-side surface of the second lens satisfy: 2.5 < (SAG11 + SAG22) / (SAG11 - SAG22) < 6.5. By controlling the relationship between the sagittal height of the object-side surface of the first lens and the sagittal height of the image-side surface of the second lens within a certain range, the deflection angle of the marginal rays of the system can be reasonably controlled, and the sensitivity of the first lens and the second lens of the system can be effectively reduced. More specifically, the axial distance SAG11 between the intersection of the object-side surface of the first lens and the optical axis and the vertex of the effective radius of the object-side surface of the first lens and the axial distance SAG22 between the intersection of the image-side surface of the second lens and the optical axis and the vertex of the effective radius of the image-side surface of the second lens satisfy: 2.80 < (SAG11 + SAG22) / (SAG11 - SAG22) < 6.10.

[0080] In the present exemplary embodiment, the axial distance SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens and the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens satisfy: -4.0 < (SAG52 - SAG61) / (SAG52 + SAG61) < -2.0. By controlling the sagittal height of the object-side surface and the image-side surface of the fifth lens within a certain range, the deflection angle of the marginal rays of the system can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, the axial distance SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens and the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens satisfy: -3.70 < (SAG52 - SAG61) / (SAG52 + SAG61) < -2.20.

[0081] In this exemplary embodiment, the sum of the central thicknesses of all lenses on the optical axis, ∑CT, and the central thickness of the second lens on the optical axis, CT2, satisfy: 13.5 < ∑CT / CT2 ≤ 16. Reasonably adjusting the ratio of the sum of the central thicknesses of the first lens to the seventh lens and the central thickness of the second lens can effectively reduce the ghost image risk of the second lens and contribute to the size compression of the camera lens group. More specifically, the sum of the central thicknesses of all lenses on the optical axis, ∑CT, and the central thickness of the second lens on the optical axis, CT2, satisfy: 13.5 < ∑CT / CT2 ≤ 15.5.

[0082] In this exemplary embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture stop to the image side surface of the last lens satisfy: 1.0 < TTL / SD < 1.5. Overconstraining the relative relationship between the total length of the optical system and the aperture stop position can reasonably control the distortion of the system and enable the system to have good distortion performance. More specifically, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture stop to the image side surface of the last lens satisfy: 1.20 < TTL / SD < 1.45.

[0083] In this exemplary embodiment, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1 - V2 > 30. By controlling the Abbe numbers of the first lens and the second lens located at the front of the system, the lateral chromatic aberration, axial chromatic aberration, and chromatic spherical aberration of the system can be strongly corrected. Thus, the image quality of the system is better guaranteed. More specifically, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1 - V2 > 36.

[0084] In this exemplary embodiment, the Abbe number V1 of the first lens and the Abbe number V4 of the fourth lens satisfy: V1 - V4 < 20. By selecting materials with relatively small Abbe number aberrations for the first lens and the fourth lens of the system, the magnification chromatic aberration and lateral chromatic aberration of the system can be effectively corrected. Thus, the image quality of the system is better guaranteed. More specifically, the Abbe number V1 of the first lens and the Abbe number V4 of the fourth lens satisfy: V1 - V4 < 15.

[0085] In this exemplary embodiment, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0086]

[0087] Wherein, x is the sagitta, which is the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at the position with height h; 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); k is the conic constant; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0088] In this exemplary embodiment, the above optical imaging lens may further include a diaphragm. The diaphragm can be disposed at an appropriate position as needed. For example, the diaphragm can be disposed between the object side and the first lens. Optionally, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0089] The optical imaging lens according to the above embodiment of the present invention may employ multiple lenses, such as the eight lenses described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the optical imaging lens has a large imaging surface, features a wide imaging range and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0090] In the exemplary embodiment, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the lens surfaces from the object side of the first lens to the image side of the eighth lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better radius of curvature characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical surface. Optionally, both the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are aspherical surfaces.

[0091] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0092] The following further describes a specific embodiment of the optical imaging lens applicable to the above embodiment with reference to the accompanying drawings. Specific Embodiment 1

[0094] Figure 1 FIG. 2 is a schematic structural diagram of a lens group according to Embodiment 1 of the optical imaging lens of the present invention. The optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a 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, a filter E9, and an imaging surface S19.

[0095] The first lens E1 has a positive optical power. Its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power. Its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power. Its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power. Its object surface S7 is concave, and its image surface S8 is convex. The fifth lens E5 has a negative optical power. Its object surface S9 is convex, and its image surface S10 is concave. The sixth lens E6 has a negative optical power. Its object surface S11 is concave, and its image surface S12 is convex. The seventh lens E7 has a positive optical power. Its object surface S13 is convex, and its image surface S14 is concave. The eighth lens E8 has a negative optical power. Its object surface S15 is concave, and its image surface S16 is convex. The filter E9 has an object surface S17 and an image surface S18. Light from an object sequentially passes through the surfaces of S1 to S18 and finally forms an image on the imaging surface S19.

[0096] As shown in Table 1, it is a basic parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0097]

[0098] Table 1

[0099] As shown in Table 2, in Embodiment 1, the total effective focal length f of the optical imaging lens is 8.69 mm, the distance TTL on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 10.20 mm, and half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 8.27 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 43.0°.

[0100]

[0101] Table 2

[0102] The optical imaging lens in Embodiment 1 satisfies:

[0103] SAG21 / SAG31 = 2.52; where SAG21 is the axial distance between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens, and SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens.

[0104] TTL / ImgH = 1.23; where ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and TTL is the axial distance from the object side surface of the first lens to the imaging surface.

[0105] f / EPD = 1.99; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.

[0106] (R6 + R5) / (R6 - R5) = 5.36; where R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

[0107] (R6 - R7) / (R6 + R7) = -1.70; where R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.

[0108] (SAG11 + SAG22) / (SAG11 - SAG22) = 4.34; where SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens.

[0109] (SAG52 - SAG61) / (SAG52 + SAG61) = -3.28; where SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0110] ∑CT / CT2 = 13.91; where ∑CT is the sum of the central thicknesses of all lenses on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0111] TTL / SD = 1.22; where TTL is the axial distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the diaphragm to the image side surface of the last lens.

[0112] V1 - V2 = 36.90; where V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0113] V1 - V4 = 14.20; where V1 is the Abbe number of the first lens and V4 is the Abbe number of the fourth lens.

[0114] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 3 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0115] Face number A4 A6 A8 A10 A12 A14 A16 S1 -8.3965E-02 -3.2594E-02 -9.9796E-03 -2.4341E-03 -4.2372E-04 2.4880E-05 7.2907E-05 S2 -1.7213E-01 -3.4069E-03 -8.1078E-03 1.9786E-03 5.5869E-04 8.3652E-04 3.8904E-04 S3 -1.1831E-01 4.1451E-02 -6.1748E-03 -8.6602E-04 -7.7143E-04 3.3298E-04 1.2838E-04 S4 -3.1878E-02 2.0715E-02 1.3380E-03 -1.1673E-03 -1.3060E-03 -6.6088E-04 -2.4701E-04 S5 -4.9331E-03 1.8106E-02 8.0663E-03 1.9936E-03 3.3922E-04 -2.7060E-05 -4.3001E-06 S6 -6.1535E-02 4.5041E-03 3.9640E-03 1.0449E-03 1.8909E-04 2.7820E-05 1.2055E-05 S7 -2.9188E-01 -4.1812E-02 -4.6343E-03 -1.0092E-03 -6.3440E-04 -3.1077E-04 -9.2742E-05 S8 -4.5877E-01 -4.1643E-02 5.6135E-03 2.0982E-03 8.2277E-04 6.9352E-04 9.9443E-04 S9 -7.3692E-01 3.5553E-02 -7.0602E-03 -1.4094E-02 8.2476E-04 2.7470E-04 2.0067E-03 S10 -9.6608E-01 9.3458E-02 9.1507E-03 -1.6691E-02 9.8980E-03 -3.7334E-03 -9.6413E-05 S11 2.8580E-01 -2.7244E-01 1.9255E-01 6.4061E-04 7.9381E-03 -1.1603E-02 1.2401E-03 S12 -7.4824E-01 2.5411E-01 -6.8456E-03 -3.4867E-03 -1.3483E-02 1.2090E-02 8.0571E-03 S13 -8.4351E+00 2.0839E+00 -3.3600E-01 -1.7103E-02 8.0202E-03 1.7649E-02 -1.5897E-02 S14 -7.2186E+00 6.4891E-01 1.9758E-01 -9.5594E-02 6.2285E-02 -1.1027E-02 5.4666E-02 S15 5.2693E+00 -3.5472E-01 -5.3227E-02 -1.2066E-01 1.0905E-02 -1.6642E-02 7.7376E-03 S16 -9.4065E-01 1.8819E+00 -3.1475E-01 2.0743E-01 9.6030E-02 -1.6822E-01 -6.0787E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 5.3964E-05 3.8391E-05 3.3034E-05 1.7647E-05 5.6767E-06 -1.1671E-06 2.3372E-08 S2 1.9815E-04 8.8705E-05 1.0216E-05 -4.6529E-06 -1.2714E-05 -5.4295E-06 1.5013E-05 S3 2.0404E-04 1.4827E-04 1.4410E-04 5.8234E-05 3.9776E-05 -7.6788E-06 1.9142E-06 S4 -1.8742E-05 3.6398E-05 4.9433E-05 1.9223E-05 1.1038E-05 -9.0833E-06 -9.0742E-06 S5 -2.6599E-05 -3.7359E-06 -1.0202E-05 -3.4974E-08 -2.7668E-06 3.2795E-06 0.0000E+00 S6 3.0076E-06 2.3983E-06 3.5945E-06 4.5624E-06 8.5619E-07 -1.5996E-06 0.0000E+00 S7 -3.4079E-05 -7.6817E-07 -3.2467E-06 1.5400E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 3.2227E-04 2.0142E-04 5.1820E-05 3.6223E-05 6.8745E-06 4.2124E-06 -8.3880E-06 S9 -3.1520E-04 1.2534E-04 6.8789E-05 4.4824E-05 -7.5236E-06 -4.5155E-06 -3.1641E-06 S10 -1.4432E-03 1.7163E-03 1.2292E-04 -1.1591E-04 -1.3185E-04 -2.0898E-05 -1.2675E-05 S11 -4.4889E-03 -2.5715E-04 4.0422E-04 7.0546E-04 1.3012E-04 9.7003E-05 -8.2970E-06 S12 -5.0259E-03 -1.4864E-03 6.0155E-04 3.4776E-04 -5.8095E-04 -1.7088E-04 -6.9495E-05 S13 5.3558E-03 4.9887E-04 -9.3018E-04 -5.7463E-04 9.9891E-04 -4.1173E-04 4.0673E-05 S14 3.3607E-02 3.5675E-02 9.1488E-03 7.4588E-03 4.4252E-03 3.2339E-03 6.7740E-04 S15 1.6354E-02 -1.9553E-03 1.3348E-02 5.4253E-03 -4.4059E-04 3.5573E-03 -1.5445E-04 S16 2.5039E-02 -3.9916E-02 -6.2132E-02 1.4340E-02 7.4912E-02 1.3367E-02 -1.9153E-02

[0116] Table 3

[0117] Figure 2a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2b shows the astigmatism curve of the optical imaging lens of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2c shows the distortion curve of the optical imaging lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2d shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2a to 2d as shown, the optical imaging lens given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0119] Figure 3 This is a schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention. The optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a 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, a filter E9, and an imaging surface S19.

[0120] The first lens E1 has a positive focal power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative focal power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a positive focal power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive focal power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has a negative focal power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has a negative focal power, with its object side S11 being concave and its image side S12 being convex. The seventh lens E7 has a positive focal power, with its object side S13 being convex and its image side S14 being concave. The eighth lens E8 has a negative focal power, with its object side S15 being concave and its image side S16 being convex. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces of S1 to S18 and finally forms an image on the imaging surface S19.

[0121] As shown in Table 4, it is the basic parameter table of the optical imaging lens in Embodiment 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0122]

[0123]

[0124] Table 4

[0125] As shown in Table 5, in Embodiment 2, the total effective focal length f of the optical imaging lens is 8.66 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 10.20 mm, and half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 8.27 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 43.0°.

[0126]

[0127] Table 5

[0128] The optical imaging lens in Embodiment 2 satisfies:

[0129] SAG21 / SAG31 = 2.40; where SAG21 is the axial distance between the intersection of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens, and SAG31 is the axial distance between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens.

[0130] TTL / ImgH = 1.23; where ImgH is half of the diagonal length of the effective pixel region on the imaging surface, and TTL is the axial distance from the object side of the first lens to the imaging surface.

[0131] f / EPD = 1.95; where f is the effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging system.

[0132] (R6 + R5) / (R6 - R5) = 4.70; where R5 is the radius of curvature of the object side surface of the third lens and R6 is the radius of curvature of the image side surface of the third lens.

[0133] (R6 - R7) / (R6 + R7) = -4.39; where R6 is the radius of curvature of the image side surface of the third lens and R7 is the radius of curvature of the object side surface of the fourth lens.

[0134] (SAG11 + SAG22) / (SAG11 - SAG22) = 6.05; where SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens.

[0135] (SAG52 - SAG61) / (SAG52 + SAG61) = -3.64; where SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0136] ∑CT / CT2 = 14.08; where ∑CT is the sum of the central thicknesses of all lenses on the optical axis and CT2 is the central thickness of the second lens on the optical axis.

[0137] TTL / SD = 1.23; where TTL is the axial distance from the object side surface of the first lens to the imaging surface and SD is the distance from the diaphragm to the image side surface of the last lens.

[0138] V1 - V2 = 36.90; where V1 is the Abbe number of the first lens and V2 is the Abbe number of the second lens.

[0139] V1 - V4 = 14.20; where V1 is the Abbe number of the first lens and V4 is the Abbe number of the fourth lens.

[0140] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0141]

[0142]

[0143] Table 6

[0144] Figure 4a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 4b shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4c shows the distortion curve of the optical imaging lens of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4d shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 4a to 4d as shown, it can be seen that the optical imaging lens given in Embodiment 2 can achieve good imaging quality. Specific Embodiment 3

[0146] Figure 5 is a schematic structural diagram of the lens group of Embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a 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, a filter E9, and an imaging surface S19.

[0147] The first lens E1 has a positive optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative optical power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive optical power, its object side S11 is concave, and its image side S12 is convex. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative optical power, its object side S15 is concave, and its image side S16 is concave. The filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the surfaces of S1 to S18 and finally forms an image on the imaging surface S19.

[0148] As shown in Table 7, it is the basic parameter table of the optical imaging lens in Embodiment 3, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0149]

[0150]

[0151] Table 7

[0152] As shown in Table 8, in Embodiment 3, the total effective focal length f of the optical imaging lens is 8.66 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 10.16 mm, and half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 8.27 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 43.3°.

[0153]

[0154] Table 8

[0155] The optical imaging lens in Embodiment 3 satisfies:

[0156] SAG21 / SAG31 = 2.33; where SAG21 is the axial distance between the intersection of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens, and SAG31 is the axial distance between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens.

[0157] TTL / ImgH = 1.23; where ImgH is half of the diagonal length of the effective pixel region on the imaging surface, and TTL is the axial distance from the object side of the first lens to the imaging surface.

[0158] f / EPD = 1.75; where f is the effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging system.

[0159] (R6 + R5) / (R6 - R5) = 2.79; where R5 is the radius of curvature of the object side surface of the third lens and R6 is the radius of curvature of the image side surface of the third lens.

[0160] (R6 - R7) / (R6 + R7) = -1.84; where R6 is the radius of curvature of the image side surface of the third lens and R7 is the radius of curvature of the object side surface of the fourth lens.

[0161] (SAG11 + SAG22) / (SAG11 - SAG22) = 2.87; where SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens.

[0162] (SAG52 - SAG61) / (SAG52 + SAG61) = -2.36; where SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0163] ∑CT / CT2 = 14.93; where ∑CT is the sum of the central thicknesses of all lenses on the optical axis and CT2 is the central thickness of the second lens on the optical axis.

[0164] TTL / SD = 1.31; where TTL is the axial distance from the object side surface of the first lens to the imaging surface and SD is the distance from the aperture stop to the image side surface of the last lens.

[0165] V1 - V2 = 36.90; where v1 is the Abbe number of the first lens and V2 is the Abbe number of the second lens.

[0166] V1 - V4 = 14.20; where V1 is the Abbe number of the first lens and V4 is the Abbe number of the fourth lens.

[0167] In Embodiment 3, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 9 shows the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A20 、A 22 、A 24 、A 26 、A 28 and A 30 。

[0168]

[0169]

[0170] Table 9

[0171] Figure 6a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6b shows the astigmatism curve of the optical imaging lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6c shows the distortion curve of the optical imaging lens of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6d shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 6a to 6d as shown, the optical imaging lens given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0173] Figure 7 is a schematic structural diagram of the lens group of Embodiment 4 of the optical imaging lens of the present invention. The optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a 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, a filter E9, and an imaging surface S19.

[0174] The first lens E1 has a positive focal power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative focal power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive focal power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has a negative focal power, its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive focal power, its object side S11 is concave, and its image side S12 is convex. The seventh lens E7 has a positive focal power, its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative focal power, its object side S15 is concave, and its image side S16 is concave. The filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the surfaces of S1 to S18 and finally forms an image on the imaging surface S19.

[0175] As shown in Table 10, it is the basic parameter table of the optical imaging lens in Embodiment 4, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0176]

[0177]

[0178] Table 10

[0179] As shown in Table 11, in Embodiment 4, the total effective focal length f of the optical imaging lens is 8.63 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 9.01 mm, and half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 8.27 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 43.4°.

[0180]

[0181] Table 11

[0182] The optical imaging lens in Embodiment 4 satisfies:

[0183] SAG21 / SAG31 = 2.37; where SAG21 is the axial distance between the intersection of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens, and SAG31 is the axial distance between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens.

[0184] TTL / ImgH = 1.09; where ImgH is half of the diagonal length of the effective pixel region on the imaging surface, and TTL is the axial distance from the object side of the first lens to the imaging surface.

[0185] f / EPD = 1.89; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.

[0186] (R6 + R5) / (R6 - R5) = 3.28; where R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens.

[0187] (R6 - R7) / (R6 + R7) = -1.32; where R6 is the radius of curvature of the image side surface of the third lens, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0188] (SAG11 + SAG22) / (SAG11 - SAG22) = 3.14; where SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens.

[0189] (SAG52 - SAG61) / (SAG52 + SAG61) = -2.26; where SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0190] ∑CT / CT2 = 15.41; where ∑CT is the sum of the central thicknesses of all lenses on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0191] TTL / SD = 1.13; where TTL is the axial distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the aperture stop to the image side surface of the last lens.

[0192] V1 - V2 = 36.90; where V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0193] V1 - V4 = 14.20; where V1 is the Abbe number of the first lens, and V4 is the Abbe number of the fourth lens.

[0194] In Embodiment 4, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 12 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18, A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0195]

[0196]

[0197] Table 12

[0198] Figure 8a shows the axial chromatic aberration curve of the optical imaging lens of Example 4, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 8b shows the astigmatism curve of the optical imaging lens of Example 4, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 8c shows the distortion curve of the optical imaging lens of Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8d shows the lateral chromatic aberration curve of the optical imaging lens of Example 4, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 8a to 8d as shown, the optical imaging lens given in Example 4 can achieve good imaging quality.

[0199] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that, The lens of the optical imaging lens has eight elements, and the optical imaging lens sequentially includes, from the object side to the image side along the optical axis: A diaphragm; A first lens with positive refractive power, whose object side is convex and image side is concave; A second lens with negative refractive power, whose object side is convex and image side is concave; A third lens with positive refractive power, whose object side is convex and image side is concave; A fourth lens, whose object side is concave and image side is convex; A fifth lens with negative refractive power, whose object side is convex and image side is concave; A sixth lens, whose object side is concave and image side is convex; A seventh lens with positive refractive power, whose object side is convex and image side is concave; An eighth lens with negative refractive power, whose object side is concave; The fourth lens has positive refractive power and the sixth lens has negative refractive power; or the fourth lens has negative refractive power and the sixth lens has positive refractive power; or the fourth lens has positive refractive power and the sixth lens has positive refractive power; Wherein, the axial distance SAG21 between the intersection point of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens and the axial distance SAG31 between the intersection point of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens satisfy: 2.33 ≤ SAG21 / SAG31 ≤ 2.52; The curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: 2.79 ≤ (R6 + R5) / (R6 - R5) ≤ 5.36; The sum of the central thicknesses of all lenses on the optical axis, ∑CT and the central thickness CT2 of the second lens on the optical axis satisfy: 13.91 ≤ ∑CT / CT2 ≤ 15.

41.

2. The optical imaging lens according to claim 1, wherein, Half of the diagonal length ImgH of the effective pixel region on the imaging surface and the axial distance TTL from the object side of the first lens to the imaging surface satisfy: 1.09 ≤ TTL / ImgH ≤ 1.

23.

3. The optical imaging lens according to claim 1, wherein, The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: 1.75 ≤ f / EPD < 2.

0.

4. The optical imaging lens according to claim 1, wherein Half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies: 43° ≤ Semi-FOV ≤ 43.4°.

5. The optical imaging lens according to claim 1, wherein Half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfies: ImgH = 8.27mm.

6. The optical imaging lens according to claim 1, wherein, The curvature radius R6 of the image side of the third lens and the curvature radius R7 of the object side of the fourth lens satisfy: -4.39 ≤ (R6 - R7) / (R6 + R7) ≤ -1.

32.

7. The optical imaging lens according to claim 1, wherein The axial distance SAG11 between the intersection point of the object side of the first lens and the optical axis and the vertex of the effective radius of the object side of the first lens and the axial distance SAG22 between the intersection point of the image side of the second lens and the optical axis and the vertex of the effective radius of the image side of the second lens satisfy: 2.87 ≤ (SAG11 + SAG22) / (SAG11 - SAG22) ≤ 6.

05.

8. The optical imaging lens according to claim 1, wherein The axial distance SAG52 between the intersection of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens and the axial distance SAG61 between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens satisfy: -3.64 ≤ (SAG52 - SAG61) / (SAG52 + SAG61) ≤ -2.

26.

9. The optical imaging lens according to claim 1, wherein The axial distance TTL from the object side of the first lens to the imaging surface and the distance SD from the aperture stop to the image side of the last lens satisfy: 1.13 ≤ TTL / SD ≤ 1.

31.

10. The optical imaging lens according to claim 1, wherein The Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1 - V2 = 36.

9.

11. The optical imaging lens according to claim 1, wherein The Abbe number V1 of the first lens and the Abbe number V4 of the fourth lens satisfy: V1 - V4 = 14.2.

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