Optical imaging lens

Abstract

The present application discloses an optical imaging lens. The optical imaging lens sequentially includes a first lens group and a second lens group along the optical axis from the object side to the image side. Among them, the first lens group includes: a first lens and a second lens having negative optical power; the second lens group includes: a third lens, a fourth lens, a fifth lens, a sixth lens having positive optical power, a seventh lens, and an eighth lens having positive optical power. Among them, there is a spacing distance between any two adjacent lenses among the first lens to the eighth lens; the optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the spacing distance between the first lens group and the second lens group on the optical axis; the object sides of the third lens and the sixth lens are both convex surfaces; and the effective focal length f2 of the second lens and the effective focal length f8 of the eighth lens satisfy: 0 < f2 / f8 < 8.

Description

Technical Field

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

[0002] With the popularization of portable electronic products such as mobile phones and tablet computers, people's requirements for the photography of mobile phone lenses are getting higher and higher. Most current mobile phone lenses use seven-piece or eight-piece lenses, which have the characteristics of high pixels and can take better picture quality, which indeed improves the user experience of mobile phone photography. At the same time, with the development of science and technology, zoom imaging technology is becoming more and more mature and is widely used in portable electronic products. The continuous zoom optical lens realizes optical zoom by changing the distance between some components, and can make the picture transition smooth during the zoom process. Therefore, in order to meet the needs of consumers, designing an eight-piece optical imaging lens with good imaging quality and continuous zoom is one of the current research hotspots. Summary of the Invention

[0003] This application provides such an optical imaging lens. The optical imaging lens sequentially includes a first lens group and a second lens group along the optical axis from the object side to the image side; wherein, the first lens group includes: a first lens and a second lens with negative optical power; the second lens group includes: a third lens, a fourth lens, a fifth lens, a sixth lens with positive optical power, a seventh lens, and an eighth lens with positive optical power; wherein, there is an interval distance between any two adjacent lenses among the first lens to the eighth lens; the optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the interval distance between the first lens group and the second lens group on the optical axis; the object sides of the third lens and the sixth lens are both convex surfaces; and the effective focal length f2 of the second lens and the effective focal length f8 of the eighth lens satisfy: 0 < f2 / f8 < 8.

[0004] In one embodiment, both the second lens and the third lens have positive optical power.

[0005] In one embodiment, both the fourth lens and the seventh lens have negative optical power.

[0006] In one embodiment, the air interval T45 between the fourth lens and the fifth 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: 1 < T45 / (CT5 + CT4) < 1.7.

[0007] In one embodiment, 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: 0.8 < (CT3 - CT5) / CT4 < 2.

[0008] In one embodiment, the maximum semi-field of view Semi-FOV of the optical imaging lens satisfies: 10° < Semi-FOV < 50°.

[0009] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 0.5 < f1 / f4 < 2.

[0010] In one embodiment, the central thickness CT8 of the eighth lens on the optical axis is greater than the central thickness of any lens among the first lens to the seventh lens on the optical axis; and the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 1.3 < (CT7 + CT8) / T78 < 2.5.

[0011] In one embodiment, when the interval distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; when the interval distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; the focal length FT of the optical imaging lens in the first state and the focal length FW of the optical imaging lens in the third state satisfy: 1.5 < FT / FW < 2.5.

[0012] In one embodiment, when the interval distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; when the interval distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; when the interval distance between the first lens group and the second lens group on the optical axis is between the minimum and the maximum, the optical imaging lens is in the second state; the focal length FT of the optical imaging lens in the first state, the focal length FM of the optical imaging lens in the second state, the focal length FW of the optical imaging lens in the third state, and the effective focal length f8 of the eighth lens satisfy: 0 < (FT + FM + FW) / f8 < 2.5.

[0013] In one embodiment, the air gap T12 between the first lens and the second lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6 < T12 / T34 < 13.

[0014] In one embodiment, both the object side and the image side of the sixth lens are convex surfaces, and the radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the radius of curvature R15 of the object side of the eighth lens, and the radius of curvature R16 of the image side of the eighth lens satisfy: -2.5 < (R12 - R11) / (R16 + R15) < -0.8.

[0015] In one embodiment, the edge thickness ET3 of the third lens and the edge thickness ET4 of the fourth lens satisfy: 0 < ET3 / ET4 < 0.9.

[0016] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 2.5 < ET1 / CT1 < 5.6.

[0017] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -3 < (f3 + f6) / f7 < -1.

[0018] In one embodiment, the curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -3 < (R3 + R4) / (R5 + R6) < 0.

[0019] In one embodiment, each of the first lens to the eighth lens is a plastic lens, and at least one of the lens surfaces of each of the first lens to the eighth lens is an aspherical lens surface.

[0020] In one embodiment, the maximum effective radius DT52 of the image side surface of the fifth lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: 1 < DT61 / DT52 < 1.3.

[0021] In one embodiment, the refractive indices of the first lens, the second lens, and the third lens are arranged in a combination of low refractive index, high refractive index, and low refractive index in sequence.

[0022] The optical imaging lens proposed in this application realizes the continuous zoom function by changing the distance between the first lens group and the second lens group, reasonably distributes the positive and negative optical powers and surface shapes of some lenses, can effectively balance the low-order aberrations of the system, and enables the system to have good imaging quality and processability. At the same time, by reasonably controlling the ratio of the effective focal lengths of the second lens and the eighth lens, the optical power of the system can be reasonably distributed, so that the positive and negative spherical aberrations of the first lens group and the second lens group cancel each other out. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of this application will become more apparent:

[0024] Figure 1 FIG. shows a schematic structural diagram of the optical imaging lens in the wide-angle end state according to Embodiment 1 of this application;

[0025] Figures 2A to 2DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 in the wide-angle end state are respectively shown;

[0026] Figure 3 The structural schematic diagram of the optical imaging lens of Embodiment 1 of the present application in the middle-end state is shown;

[0027] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 in the middle-end state are respectively shown;

[0028] Figure 5 The structural schematic diagram of the optical imaging lens of Embodiment 1 of the present application in the telephoto end state is shown;

[0029] Figures 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 in the telephoto end state are respectively shown;

[0030] Figure 7 The structural schematic diagram of the optical imaging lens of Embodiment 2 of the present application in the wide-angle end state is shown;

[0031] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2 in the wide-angle end state are respectively shown;

[0032] Figure 9 The structural schematic diagram of the optical imaging lens of Embodiment 2 of the present application in the middle-end state is shown;

[0033] Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2 in the middle-end state are respectively shown;

[0034] Figure 11 The structural schematic diagram of the optical imaging lens of Embodiment 2 of the present application in the telephoto end state is shown;

[0035] Figures 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2 in the telephoto end state are respectively shown;

[0036] Figure 13 The structural schematic diagram of the optical imaging lens of Embodiment 3 of the present application in the wide-angle end state is shown;

[0037] Figures 14A to 14DSeparate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 3 in the wide-angle state;

[0038] Figure 15 Shows a schematic structural diagram of the optical imaging lens in Example 3 of the present application in the middle state;

[0039] Figures 16A to 16D Separate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 3 in the middle state;

[0040] Figure 17 Shows a schematic structural diagram of the optical imaging lens in Example 3 of the present application in the telephoto state;

[0041] Figures 18A to 18D Separate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 3 in the telephoto state;

[0042] Figure 19 Shows a schematic structural diagram of the optical imaging lens in Example 4 of the present application in the wide-angle state;

[0043] Figures 20A to 20D Separate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 4 in the wide-angle state;

[0044] Figure 21 Shows a schematic structural diagram of the optical imaging lens in Example 4 of the present application in the middle state;

[0045] Figures 22A to 22D Separate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 4 in the middle state;

[0046] Figure 23 Shows a schematic structural diagram of the optical imaging lens in Example 4 of the present application in the telephoto state;

[0047] Figures 24A to 24D Separate diagrams show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens in Example 4 in the telephoto state;

[0048] Figure 25 Shows a schematic structural diagram of the optical imaging lens in Example 5 of the present application in the wide-angle state;

[0049] Figures 26A to 26Drespectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the wide-angle end state;

[0050] Figure 27 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application in the middle-end state;

[0051] Figures 28A to 28D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the middle-end state;

[0052] Figure 29 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application in the telephoto end state;

[0053] Figures 30A to 30D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the telephoto end state;

[0054] Figure 31 shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application in the wide-angle end state;

[0055] Figures 32A to 32D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 6 in the wide-angle end state;

[0056] Figure 33 shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application in the middle-end state;

[0057] Figures 34A to 34D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 6 in the middle-end state;

[0058] Figure 35 shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application in the telephoto end state; and

[0059] Figures 36A to 36D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 6 in the telephoto end state. Detailed Embodiments

[0060] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present 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.

[0061] It should be noted that in this specification, the expressions such as first, second, third, etc. 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 application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0062] In the drawings, for ease of illustration, 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.

[0063] In this document, 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.

[0064] It should also be understood that the terms "comprise", "comprising", "have", "include", 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 a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing 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] 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 sense unless expressly so defined herein.

[0066] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0067] The features, principles and other aspects of the present application will be described in detail below.

[0068] According to an exemplary embodiment of the present application, an optical imaging lens may include a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis. The first lens group includes: a first lens and a second lens having negative optical powers; the second lens group includes: a third lens, a fourth lens, a fifth lens, a sixth lens having positive optical power, a seventh lens, and an eighth lens having positive optical power. These eight lenses are arranged in sequence along the optical axis from the object side to the image side. The object surfaces of the third lens and the sixth lens are both convex surfaces; by reasonably distributing the positive and negative optical powers and surface types of some lenses in the optical imaging lens, the low-order aberrations of the system can be effectively balanced, so that the system has good imaging quality and processability. There may be a spacing distance between any two adjacent lenses among the first lens to the eighth lens, and the optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the spacing distance between the first lens group and the second lens group on the optical axis. Reasonably controlling the distance between the lenses enables the entire optical imaging lens to achieve a continuous zoom function during operation by changing the distance between the first lens group and the second lens group. Further, it is set that the effective focal length f2 of the second lens and the effective focal length f8 of the eighth lens satisfy: 0 < f2 / f8 < 8. By reasonably controlling the ratio of the effective focal lengths of the second lens and the eighth lens, the optical power of the system can be reasonably distributed, so that the positive and negative spherical aberrations of the first lens group and the second lens group cancel each other out.

[0069] In an exemplary embodiment, the second lens group further includes a diaphragm disposed on the object surface of the third lens.

[0070] In an exemplary embodiment, both the second lens and the third lens have positive optical powers. By reasonably distributing the positive and negative optical powers of the second lens and the third lens, the low-order aberrations of the system can be effectively balanced, so that the system has good imaging quality and processability.

[0071] In an exemplary embodiment, both the fourth lens and the seventh lens have negative optical powers. By reasonably distributing the positive and negative optical powers of the fourth lens and the seventh lens, the low-order aberrations of the system can be effectively balanced, so that the system has good imaging quality and processability.

[0072] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1 < T45 / (CT5 + CT4) < 1.7, where T45 is the air gap between the fourth lens and the fifth 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 1 < T45 / (CT5 + CT4) < 1.7 helps to make the lens size distribution uniform, ensure assembly stability, reduce the aberration of the entire optical imaging lens, and shorten the total length of the optical imaging lens.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.8 < (CT3 - CT5) / CT4 < 2, where 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 0.8 < (CT3 - CT5) / CT4 < 2 reasonably distributes the central thicknesses of the third lens, the fourth lens, and the fifth lens, making the lenses easy to injection mold, improving the processability of the optical imaging lens, and ensuring good imaging quality at the same time.

[0074] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 10° < Semi - FOV < 50°, where Semi - FOV is the maximum half - field - of - view angle of the optical imaging lens. Satisfying 10° < Semi - FOV < 50° can effectively control the focal length of the system by restricting the field - of - view angle of the optical imaging lens within a certain range, which is beneficial to the improvement of image quality.

[0075] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.5 < f1 / f4 < 2, where f1 is the effective focal length of the first lens and f4 is the effective focal length of the fourth lens. Satisfying 0.5 < f1 / f4 < 2 reasonably configures the optical powers of the first lens and the fourth lens, which is beneficial to sharing the large object - side field of view and correcting the off - axis aberration of its subsequent lens, thereby improving the imaging quality of the lens.

[0076] In an exemplary embodiment, the central thickness CT8 of the eighth lens of the optical imaging lens according to the present application on the optical axis is greater than the central thickness of any lens among the first lens to the seventh lens on the optical axis. The optical imaging lens according to the present application may satisfy: 1.3 < (CT7 + CT8) / T78 < 2.5, where CT7 is the central thickness of the seventh lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis. Satisfying 1.3 < (CT7 + CT8) / T78 < 2.5 helps to make the lens size distribution uniform, ensure assembly stability, reduce the aberration of the entire optical imaging lens, and shorten the total length of the optical imaging lens.

[0077] In an exemplary embodiment, the optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the distance between the first lens group and the second lens group on the optical axis. When the distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; when the distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; the focal length FT of the optical imaging lens in the first state and the focal length FW of the optical imaging lens in the third state satisfy: 1.5 < FT / FW < 2.5. By controlling the ratio of the overall system focal length in the first state to the overall system focal length in the third state within a certain range, the continuous zoom range is effectively controlled, so that the optical imaging lens has a continuous zoom function within a certain range.

[0078] In an exemplary embodiment, the optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the distance between the first lens group and the second lens group on the optical axis. When the distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; when the distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; when the distance between the first lens group and the second lens group on the optical axis is between the minimum and the maximum, the optical imaging lens is in the second state; the focal length FT of the optical imaging lens in the first state, the focal length FM of the optical imaging lens in the second state, the focal length FW of the optical imaging lens in the third state and the effective focal length f8 of the eighth lens satisfy: 0 < (FT + FM + FW) / f8 < 2.5, which can effectively reduce the contribution of the eighth lens to the aberration and improve the imaging quality of the system.

[0079] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 6 < T12 / T34 < 13, where T12 is the air gap between the first lens and the second lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis. Satisfying 6 < T12 / T34 < 13 and reasonably configuring the air gaps of the lenses from the first lens to the fourth lens can effectively reduce the thickness sensitivity of the lens and correct the field curvature.

[0080] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -2.5 < (R12 - R11) / (R16 + R15) < -0.8, where R11 is the curvature radius of the object side of the sixth lens, R12 is the curvature radius of the image side of the sixth lens, R15 is the curvature radius of the object side of the eighth lens, and R16 is the curvature radius of the image side of the eighth lens. Satisfying -2.5 < (R12 - R11) / (R16 + R15) < -0.8 can effectively control the optical powers of the sixth lens and the eighth lens, enable better deflection of the system light rays in the sixth lens and the eighth lens, and obtain a better imaging effect.

[0081] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0 < ET3 / ET4 < 0.9, where ET3 is the edge thickness of the third lens and ET4 is the edge thickness of the fourth lens. Satisfying 0 < ET3 / ET4 < 0.9 helps to make the lens size distribution uniform, ensure assembly stability, and reduce the aberration of the entire optical imaging lens.

[0082] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.5 < ET1 / CT1 < 5.6, where CT1 is the central thickness of the first lens on the optical axis and ET1 is the edge thickness of the first lens. Satisfying 2.5 < ET1 / CT1 < 5.6 is beneficial to improving the processing manufacturability of the first lens and reducing the forming manufacturing difficulty.

[0083] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -3 < (f3 + f6) / f7 < -1, where f3 is the effective focal length of the third lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. Satisfying -3 < (f3 + f6) / f7 < -1 is beneficial to reasonably controlling the residual of the balanced positive and negative spherical aberrations of these three lenses within a smaller reasonable range, and then making it easier for the optical imaging lens to ensure the image quality near the on-axis field of view.

[0084] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -3 < (R3 + R4) / (R5 + R6) < 0, where R3 is the curvature radius of the object side of the second lens, R4 is the curvature radius of the image side of the second lens, R5 is the curvature radius of the object side of the third lens, and R6 is the curvature radius of the image side of the third lens. Satisfying -3 < (R3 + R4) / (R5 + R6) < 0 can effectively control the optical power of the second lens and the third lens, enable better deflection of the system light rays in the second lens and the third lens, and obtain a better imaging effect.

[0085] In an exemplary embodiment, each of the first lens to the eighth lens is a plastic lens, and at least one of the lens surfaces of each of the first lens to the eighth lens is an aspherical lens surface. Using plastic lenses and having at least one aspherical surface in the plastic lenses can increase the system optimization freedom, is beneficial to balancing the system aberration, and improving the imaging quality of the lens.

[0086] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1 < DT61 / DT52 < 1.3, where DT52 is the maximum effective radius of the image side surface of the fifth lens, and DT61 is the maximum effective radius of the object side surface of the sixth lens. By satisfying 1 < DT61 / DT52 < 1.3, by defining the ratio range of the maximum effective radius of the object side surface of the fifth lens and the maximum effective radius of the object side surface of the sixth lens, the shapes of the fifth lens and the sixth lens can be effectively constrained, thereby effectively improving the illumination characteristics of the system.

[0087] In an exemplary embodiment, the refractive indices of the first lens, the second lens, and the third lens are arranged in a form of low refractive index, high refractive index, and low refractive index in sequence. Using this combination of refractive index materials is beneficial for correcting chromatic aberration of the system and balancing system aberrations, thereby improving the imaging quality of the lens.

[0088] In an exemplary embodiment, at least one of the lens surfaces of each of the first lens to the eighth lens is an aspherical lens surface. The present application does not specifically limit the specific numbers of spherical lenses and aspherical lenses. If the resolution quality is the key concern, aspherical lenses can be used for all lenses. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. The characteristics of a spherical lens are that it has a constant curvature from the center to the periphery of the lens. Aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and astigmatism aberration. After using aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each of the first lens to the eighth lens are both aspherical lens surfaces.

[0089] In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of -11.3 mm to -8.1 mm, the effective focal length f2 of the second lens may be, for example, in the range of 22.0 mm to 30.3 mm, the effective focal length f3 of the third lens may be, for example, in the range of 4.4 mm to 4.9 mm, the effective focal length f4 of the fourth lens may be, for example, in the range of -8.4 mm to -6.8 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of -294.0 mm to 25773.0 mm, the effective focal length f6 of the sixth lens may be, for example, in the range of 6.8 mm to 7.6 mm, the effective focal length f7 of the seventh lens may be, for example, in the range of -6.6 mm to -5.2 mm, and the effective focal length f8 of the eighth lens may be, for example, in the range of 16.3 mm to 21.8 mm. Half of the image height ImgH corresponding to the maximum field of view angle of the optical imaging lens may be, for example, in the range of 5.1 mm to 5.4 mm. Exemplarily, ImgH is 5.27 mm.

[0090] In an exemplary embodiment, when the spacing distance between the first lens group and the second lens group on the optical axis is at a minimum, i.e., when the optical imaging lens is in the first state, the effective focal length f (i.e., FT) of the optical imaging lens can be, for example, in the range of 11.2 mm to 14.1 mm, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis can be, for example, in the range of 16.4 mm to 18.5 mm, the maximum field of view FOV of the optical imaging lens can be, for example, in the range of 42° to 50°, and the aperture value Fno of the optical imaging lens can be, for example, in the range of 2.8 to 3.7.

[0091] In an exemplary embodiment, when the spacing distance between the first lens group and the second lens group on the optical axis is at a maximum, i.e., when the optical imaging lens is in the third state, the effective focal length f (i.e., FW) of the optical imaging lens can be, for example, in the range of 5.6 mm to 6.9 mm, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis can be, for example, in the range of 18.5 mm to 19.5 mm, the maximum field of view FOV of the optical imaging lens can be, for example, in the range of 78° to 94°, and the aperture value Fno of the optical imaging lens can be, for example, in the range of 2.0 to 2.5.

[0092] In an exemplary embodiment, when the spacing distance between the first lens group and the second lens group on the optical axis is between the minimum and the maximum, the optical imaging lens is in the second state. The effective focal length f (i.e., FM) of the optical imaging lens can be, for example, in the range of 2.8 mm to 10.1 mm, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis can be, for example, in the range of 16.7 mm to 17.9 mm, the maximum field of view FOV of the optical imaging lens can be, for example, in the range of 55.5° to 62.5°, and the aperture value Fno of the optical imaging lens can be, for example, in the range of 2.5 to 3.0.

[0093] In an exemplary embodiment, when the spacing distance between the first lens group and the second lens group on the optical axis is at a minimum, the optical imaging lens is in the first state. At this time, the optical imaging lens has the characteristic of a long focal length, that is, the optical imaging lens is in the long focal length end state; when the spacing distance between the first lens group and the second lens group on the optical axis is at a maximum, the optical imaging lens is in the third state. At this time, the optical imaging lens has the characteristic of a wide angle, that is, the optical imaging lens is in the wide angle end state; when the spacing distance between the first lens group and the second lens group on the optical axis is between the minimum and the maximum, the optical imaging lens is in the second state. At this time, the optical imaging lens has a state between the long focal length end state and the wide angle end state, that is, the optical imaging lens is in the middle end state.

[0094] In an exemplary embodiment, the optical imaging lens according to the present application further includes a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0095] The present application provides an optical imaging lens having characteristics such as a large field of view, high pixels, miniaturization, and high imaging quality. The optical imaging lens according to the above embodiment of the present application 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 incident light can be effectively converged, the optical total length of the optical imaging lens can be reduced, and the processability of the optical imaging lens can be improved, making the optical imaging lens more conducive to production and processing. 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.

[0096] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0097] Example 1

[0098] The following refers to Figures 1 to 6D Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 、 Figure 3 and Figure 5 respectively show schematic structural diagrams of the optical imaging lens according to Embodiment 1 of the present application in the wide-angle end state, the middle-end state, and the telephoto end state.

[0099] As Figure 1 、 Figure 3 and Figure 5As shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, 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. The first lens E1 has a negative optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a positive 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 convex. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is convex, and its image surface S10 is concave. The sixth lens E6 has a positive optical power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The eighth lens E8 has a positive optical power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0100] Table 1 shows the basic parameter table of the optical imaging lens of Example 1, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm).

[0101]

[0102] Table 1

[0103] In Example 1, the object surface and the image surface of any one of the first lens E1 to the eighth lens E8 are both aspherical. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0104]

[0105] where x is the sagitta, the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of 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 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Tables 2-1 and 2-2 below give 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 , A28 and A 30 。

[0106]

[0107]

[0108] Table 2-1

[0109] Plane Number A18 A20 A22 A24 A26 A28 A30 S1 -3.9461E-04 4.3096E-04 -2.3602E-04 2.9443E-05 1.3144E-05 7.8593E-06 -2.3311E-05 S2 -1.5663E-03 -2.5349E-04 3.0844E-04 1.5546E-04 -7.1946E-05 -6.8677E-05 -2.5393E-05 S3 -1.1266E-03 -2.0195E-04 3.3497E-04 1.6932E-04 -6.0615E-05 -6.3834E-05 -2.1022E-05 S4 -2.4101E-04 1.1347E-04 1.3850E-04 -3.2073E-06 -5.1586E-05 -2.1607E-05 -4.1038E-06 S5 -6.1685E-07 -5.9969E-06 -2.0253E-06 -3.2205E-06 -2.2004E-06 -2.4676E-06 -9.4278E-07 S6 8.3801E-05 -5.6271E-05 2.6286E-05 -1.7302E-05 4.9811E-06 -3.6236E-06 -4.0751E-08 S7 8.0347E-05 -4.7380E-05 2.2807E-05 -1.2564E-05 3.9147E-06 -1.8730E-06 -1.5080E-07 S8 1.5457E-05 -6.9871E-06 2.6330E-06 -2.5476E-07 -2.3168E-07 4.9339E-07 -5.9822E-07 S9 6.2462E-06 1.9866E-06 3.5388E-06 1.8820E-06 -7.8592E-07 -7.4512E-07 2.6272E-08 S10 1.7189E-05 4.3702E-06 2.6501E-06 3.2935E-06 1.2368E-06 -2.1834E-07 -1.5470E-07 S11 1.3300E-04 3.2994E-05 -2.8442E-07 -9.5677E-07 1.4302E-06 1.5340E-06 -1.7214E-07 S12 1.4633E-04 4.0031E-05 -9.9121E-06 1.2578E-05 1.2433E-06 1.7168E-06 -4.0006E-06 S13 6.8971E-04 -1.2541E-04 1.2235E-04 5.5413E-06 5.3499E-06 -2.0911E-05 -2.8712E-05 S14 2.1400E-03 -8.9749E-04 4.8177E-04 -3.0335E-04 2.9470E-05 -7.3761E-05 3.7563E-05 S15 2.6096E-04 -3.8720E-04 -1.1131E-05 9.5022E-05 3.7474E-05 -7.7784E-05 -8.5877E-05 S16 -2.5694E-03 -7.1323E-04 -3.1893E-04 -7.9426E-05 1.6368E-06 8.4205E-05 -1.5557E-06

[0110] Table 2-2

[0111] In this embodiment and the following embodiments, the optical imaging lens realizes the continuous zoom function by changing the distance between the first lens group and the second lens group. Specifically, in an exemplary embodiment, when the distance D4 between the first lens group and the second lens group changes, the distance D12 between the seventh lens and the eighth lens and the distance D16 between the eighth lens and the filter can change accordingly to ensure that the total length TTL of the optical imaging lens is within a stable range and a good imaging effect is presented. Table 2-3 shows some basic parameters of the optical imaging lens of Embodiment 1 in the wide-angle state, the middle state, and the telephoto state.

[0112] In this embodiment and the following embodiments, the focal length F of the optical imaging lens in the wide-angle state also represents the focal length FW of the optical imaging lens in the third state; the focal length F of the optical imaging lens in the middle state also represents the focal length FM of the optical imaging lens in the second state; the focal length F of the optical imaging lens in the telephoto state also represents the focal length FT of the optical imaging lens in the first state.

[0113] Parameter / Status Wide-angle End Status Mid-range End Status Telephoto End Status TTL (mm) 19.00 17.80 18.47 ImgH (mm) 5.27 5.27 5.27 FOV (°) 80.6 56.7 42.2 Fno 2.15 2.90 3.60 F (mm) 6.10 10.06 14.03 D4 (mm) 5.47 1.91 0.15 D12 (mm) 1.28 0.58 0.25 D16 (mm) 0.45 3.51 6.27 ET1 2.13 2.13 2.13 ET3 0.39 0.39 0.39 ET4 0.82 0.82 0.82 DT52 2.20 2.20 2.20 DT61 2.41 2.41 2.41

[0114] Table 2-3

[0115] In this embodiment and the following embodiments, the axial chromatic aberration curve represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens, the astigmatism curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane, the distortion curve represents the distortion magnitude values corresponding to different field angles, and the lateral chromatic aberration curve represents the deviation of different image heights on the imaging plane after the light rays pass through the lens.

[0116] Figures 2A to 2D respectively show the axial chromatic aberration curve, the astigmatism curve, the distortion curve, and the lateral chromatic aberration curve of the optical imaging lens of Embodiment 1 in the wide-angle state, Figures 4A to 4D respectively show the axial chromatic aberration curve, the astigmatism curve, the distortion curve, and the lateral chromatic aberration curve of the optical imaging lens of Embodiment 1 in the middle state, Figures 6A to 6DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 1 are respectively shown in the telephoto state. According to Figures 2A to 2D , Figures 4A to 4D and Figures 6A to 6D it can be known that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0117] Example 2

[0118] The following will refer to Figures 7 to 12D to describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 7 , Figure 9 and Figure 11 respectively show the schematic structural diagrams of the optical imaging lens according to Embodiment 2 of the present application in the wide-angle state, the middle state, and the telephoto state.

[0119] As Figure 7 , Figure 9 and Figure 11 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, 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. The first lens E1 has a negative optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a positive 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 convex. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is convex, and its image surface S10 is convex. The sixth lens E6 has a positive optical power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The eighth lens E8 has a positive optical power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0120] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units of curvature radius, thickness, and effective focal length are all in millimeters (mm). Tables 4-1 and 4-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 2, where the surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above. Table 4-3 shows some basic parameters of the optical imaging lens of Example 2 at the wide-angle end, intermediate end, and telephoto end.

[0121]

[0122] Table 3

[0123]

[0124]

[0125] Table 4-1

[0126] Plane Number A18 A20 A22 A24 A26 A28 A30 S1 -5.5715E-04 2.7677E-04 -1.6994E-04 1.7239E-04 -1.1753E-04 4.4478E-05 -9.1585E-06 S2 -1.3896E-03 2.8310E-05 -1.5573E-04 2.0561E-04 2.3895E-04 1.4332E-04 3.7752E-05 S3 -8.8901E-04 2.6305E-04 2.1775E-05 2.0114E-04 1.7434E-04 9.3268E-05 -2.2911E-06 S4 5.8697E-05 2.9129E-04 1.0077E-05 8.8481E-05 2.1943E-05 -1.2168E-05 -1.1013E-05 S5 4.6326E-06 -3.2068E-06 -5.6025E-07 -3.9060E-06 -2.1143E-06 -4.2834E-06 -5.8871E-07 S6 3.4865E-05 -1.1991E-05 6.2288E-06 -2.7142E-06 -3.2899E-06 -1.9807E-06 -1.7054E-06 S7 2.7060E-05 -7.4239E-06 5.8501E-06 3.3524E-07 -4.9538E-07 -7.3792E-07 -4.5856E-07 S8 -9.9350E-07 7.5490E-07 -1.5723E-06 1.2948E-06 -5.8721E-08 1.4200E-06 -1.0876E-06 S9 2.9017E-05 5.3529E-06 6.3915E-06 -1.7484E-06 3.8707E-07 -1.6281E-06 1.8780E-07 S10 8.4818E-05 3.9839E-05 1.9092E-05 9.8907E-06 3.1494E-06 4.5673E-07 -3.0114E-07 S11 1.7022E-05 4.3213E-06 9.4448E-06 2.2665E-06 5.5589E-06 2.8844E-06 1.8396E-06 S12 -1.3898E-04 5.8089E-06 -5.9395E-06 1.2915E-06 -1.0642E-06 1.6894E-06 -3.9367E-06 S13 1.0037E-03 -4.7120E-04 -8.3945E-05 -3.8227E-05 -4.3567E-05 -5.1809E-05 -4.9257E-06 S14 3.0198E-03 -1.5305E-03 4.7077E-04 -1.2692E-04 1.9381E-05 -3.8523E-05 3.1656E-05 S15 2.0462E-04 1.2661E-05 -2.2795E-04 -1.5454E-04 2.6338E-04 6.0919E-05 -1.4073E-04 S16 -3.8366E-04 6.5582E-04 1.0503E-03 1.1750E-04 -3.8558E-04 -3.4563E-05 -8.1929E-05

[0127] Table 4-2

[0128] Parameter / Status Wide-angle End Status Mid-range End Status Telephoto End Status TTL (mm) 18.74 16.94 17.20 ImgH (mm) 5.27 5.27 5.27 FOV (°) 84.7 55.6 45.1 Fno 2.15 2.90 3.60 F (mm) 5.89 9.50 12.06 D4 (mm) 5.25 1.44 0.12 D12 (mm) 1.20 0.57 0.26 D16 (mm) 0.45 3.08 4.97 ET1 2.33 2.33 2.33 ET3 0.38 0.38 0.38 ET4 0.86 0.86 0.86 DT52 2.25 2.25 2.25 DT61 2.48 2.48 2.48

[0129] Table 4-3 Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 2 at the wide-angle end state are shown respectively. Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 2 are shown respectively when the lens is in the middle end state. Figures 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 2 are shown respectively. Figures 8A to 8D , Figures 10A to 10D as well as Figures 12A to 12D It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0130] Example 3

[0131] The following reference Figures 13 to 18D An optical imaging lens according to Example 3 of the present application is described. Figure 13 , Figure 15 and Figure 17 Schematic diagrams of the structures of the optical imaging lens according to Example 3 of the present application in the wide-angle end state, the intermediate end state and the telephoto end state are respectively shown.

[0132] like Figure 13 , Figure 15 and Figure 17As shown in the figure, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, 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. The first lens E1 has a negative optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a positive 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 convex. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative optical power, its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a positive optical power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The eighth lens E8 has a positive optical power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0133] Table 5 shows the basic parameter table of the optical imaging lens of Embodiment 3, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above. Table 6-3 shows some basic parameters of the optical imaging lens of Embodiment 3 in the wide-angle state, the intermediate state, and the telephoto state.

[0134]

[0135]

[0136] Table 5

[0137] Plane Number A4 A6 A8 A10 A12 A14 A16 S1 1.2563E-01 -1.6567E-01 8.6762E-02 -3.4563E-02 1.5778E-02 -7.2221E-03 2.1820E-03 S2 3.7985E-02 -2.1543E-01 3.2802E-02 -2.9397E-02 -1.5885E-03 -9.9087E-03 -4.6736E-03 S3 -5.5080E-01 -7.2485E-02 -4.1957E-02 -2.8656E-02 -1.4855E-02 -7.9868E-03 -1.6002E-03 S4 -5.2922E-01 1.4806E-03 -3.4345E-02 -1.3276E-02 -4.6720E-03 1.2749E-03 2.0104E-03 S5 -1.3249E-02 -4.6158E-03 -9.9421E-04 -1.6590E-04 -2.8973E-05 -1.5743E-05 -2.6184E-06 S6 1.5681E-02 4.0691E-03 -1.9327E-03 9.9804E-04 -5.9105E-04 3.0347E-04 -1.4736E-04 S7 -1.4285E-01 2.7562E-02 -3.9878E-03 1.4069E-03 -6.3171E-04 3.0834E-04 -1.1995E-04 S8 -5.1453E-02 2.5356E-02 -1.1060E-03 6.0607E-04 -1.5981E-04 6.1820E-05 -1.2194E-05 S9 -1.4219E-01 1.4023E-02 6.5196E-04 1.9843E-03 4.6971E-04 2.5770E-04 9.9482E-05 S10 -4.5284E-01 1.4084E-02 -4.0038E-03 1.9353E-03 4.3357E-04 3.9714E-04 1.8316E-04 S11 -8.9803E-01 -4.3203E-03 1.2982E-02 4.7996E-04 -1.1944E-03 5.9581E-05 3.9322E-04 S12 -2.9273E-01 3.6215E-02 2.4507E-02 -3.0519E-03 -2.3357E-03 4.4127E-04 3.7406E-04 S13 1.3234E+00 -1.7169E-01 1.3636E-02 1.6864E-03 -3.8211E-03 4.4207E-03 -4.1132E-03 S14 -1.3237E-01 9.2144E-04 -3.4658E-02 2.6154E-02 -1.8718E-02 1.2602E-02 -8.3105E-03 S15 -3.0163E+00 7.5256E-01 -2.1394E-01 6.6638E-02 -2.8283E-02 9.7667E-03 -3.9686E-03 S16 -2.8762E+00 4.8018E-01 -1.1203E-01 6.9787E-03 -1.1698E-02 -1.9382E-03 -4.3423E-03

[0138] Table 6-1

[0139]

[0140]

[0141] Table 6-2

[0142] Parameter / Status Wide-angle End Status Mid-range End Status Telephoto End Status TTL (mm) 19.48 16.86 16.53 ImgH (mm) 5.27 5.27 5.27 FOV (°) 78.4 56.1 46.8 Fno 2.14 2.53 2.86 F (mm) 6.81 9.57 11.69 D4 (mm) 5.29 1.51 0.11 D12 (mm) 1.39 0.98 0.58 D16 (mm) 0.54 2.12 3.59 ET1 2.47 2.47 2.47 ET3 0.25 0.25 0.25 ET4 0.92 0.92 0.92 DT52 2.30 2.30 2.30 DT61 2.59 2.59 2.59

[0143] Table 6-3

[0144] Figures 14A to 14DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 3 at the wide-angle end state are shown respectively. Figures 16A to 16D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 3 are shown respectively when the lens is in the middle end state. Figures 18A to 18D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 3 are shown respectively. Figures 14A to 14D , Figures 16A to 16D as well as Figures 18A to 18D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0145] Example 4

[0146] The following reference Figures 19 to 24D An optical imaging lens according to Example 4 of the present application is described. Figure 19 , Figure 21 and Figure 23 Schematic diagrams of the structures of the optical imaging lens according to Example 4 of the present application in the wide-angle end state, the intermediate end state and the telephoto end state are respectively shown.

[0147] like Figure 19 , Figure 21 and Figure 23 As shown, the optical imaging lens comprises, from object side to image side, a first lens element E1, a second lens element E2, an aperture STO, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an imaging surface S19. The first lens element E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens element E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens element E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens element E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens element E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens element E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens element E7 has negative refractive power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The optical filter E9 has an object-side surface S17 and an image-side surface S18. Light from an object sequentially passes through surfaces S1 to S18 and is ultimately imaged on imaging surface S19.

[0148] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units of curvature radius, thickness, and effective focal length are all in millimeters (mm). Tables 8-1 and 8-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 4, where the surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above. Table 8-3 shows some basic parameters of the optical imaging lens of Example 4 at the wide-angle end, intermediate end, and telephoto end.

[0149]

[0150] Table 7

[0151]

[0152]

[0153] Table 8-1

[0154] Plane Number A18 A20 A22 A24 A26 A28 A30 S1 -1.0241E-03 9.1302E-04 -5.5960E-04 3.0685E-04 -2.6599E-04 4.3990E-05 -8.9033E-05 S2 -4.8256E-03 -8.0752E-04 -1.1204E-03 -2.7464E-04 -1.1586E-04 8.5354E-05 5.5269E-05 S3 -7.8172E-04 8.5564E-04 -5.9467E-05 6.7320E-05 9.9751E-05 1.3122E-04 4.7605E-05 S4 5.8300E-04 8.1493E-05 -3.3373E-04 -1.5247E-05 1.0888E-05 1.2422E-05 -1.2163E-05 S5 -2.0387E-06 8.6115E-07 2.2561E-06 2.2634E-06 1.9489E-06 3.3580E-07 3.2610E-08 S6 6.7103E-05 -2.3264E-05 1.4384E-05 -4.4093E-07 -6.3571E-07 1.4462E-07 -1.7252E-06 S7 5.5076E-05 -1.3547E-05 8.1114E-06 2.1859E-06 -1.4907E-06 1.1811E-06 -7.5457E-07 S8 2.3980E-06 2.7628E-06 -2.3487E-06 2.2079E-06 -2.4724E-07 1.3135E-06 -4.5224E-07 S9 2.0006E-05 8.5686E-06 3.0630E-07 2.3372E-06 -5.5009E-07 -9.5569E-07 -2.6474E-07 S10 7.9331E-05 3.9693E-05 1.3630E-05 9.2901E-06 4.0706E-06 1.0866E-06 4.6630E-07 S11 6.6470E-05 4.8461E-05 2.9094E-05 4.5967E-05 2.4696E-05 8.9067E-06 -5.1785E-07 S12 -2.3510E-05 1.7693E-05 4.9977E-05 5.8382E-05 3.2046E-05 -2.1367E-06 1.2213E-06 S13 2.4282E-03 -8.2747E-04 3.4891E-04 9.3994E-06 -2.1132E-05 4.5000E-05 -1.2702E-05 S14 4.3966E-03 -1.9290E-03 7.6307E-04 -1.6086E-04 -7.1743E-06 7.5361E-05 -2.1444E-05 S15 1.1635E-03 3.4227E-04 -2.2704E-04 3.2310E-04 -6.2443E-04 -7.5093E-05 6.9963E-05 S16 -1.6257E-03 3.4727E-03 -9.6626E-04 1.3938E-03 -2.3480E-04 -4.5635E-04 -1.4158E-04

[0155] Table 8-2

[0156] Parameter / Status Wide-angle End Status Mid-range End Status Telephoto End Status TTL (mm) 19.40 16.79 16.49 ImgH (mm) 5.27 5.27 5.27 FOV (°) 79.1 56.2 46.7 Fno 2.14 2.53 2.86 F (mm) 6.73 2.82 11.52 D4 (mm) 5.27 1.49 0.11 D12 (mm) 1.39 0.97 0.58 D16 (mm) 0.53 2.11 3.59 ET1 2.47 2.47 2.47 ET3 0.26 0.26 0.26 ET4 0.91 0.91 0.91 DT52 2.30 2.30 2.30 DT61 2.59 2.59 2.59

[0157] Table 8-3

[0158] Figures 20A to 20D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 4 at the wide-angle end state are shown respectively. Figures 22A to 22D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 4 at the intermediate end state are shown respectively. Figures 24A to 24D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 4 are shown respectively. Figures 20A to 20D , Figures 22A to 22D as well as Figures 24A to 24D It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0159] Example 5

[0160] The following reference Figures 25 to 30D An optical imaging lens according to Example 5 of the present application is described. Figure 25 , Figure 27 and Figure 29 Schematic diagrams of the structures of the optical imaging lens according to Example 5 of the present application in the wide-angle end state, the intermediate end state, and the telephoto end state are respectively shown.

[0161] like Figure 25 , Figure 27and Figure 29 As shown in Figure 29 , the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, 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. The first lens E1 has a negative focal power, its object surface S1 is concave, and its image surface S2 is concave. The second lens E2 has a positive focal power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is convex. The fourth lens E4 has a negative focal power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive focal power, its object surface S9 is convex, and its image surface S10 is concave. The sixth lens E6 has a positive focal power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative focal power, its object surface S13 is concave, and its image surface S14 is concave. The eighth lens E8 has a positive focal power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0162] Table 9 shows the basic parameter table of the optical imaging lens of Example 5, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 10-1 and 10-2 show the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 5, where each aspherical surface type can be defined by the formula (1) given in Example 1 above. Table 10-3 shows some basic parameters of the optical imaging lens of Example 5 in the wide-angle state, the middle state, and the telephoto state.

[0163]

[0164]

[0165] Table 9

[0166] Plane Number A4 A6 A8 A10 A12 A14 A16 S1 4.0456E-01 -1.9091E-01 9.6173E-02 -3.9287E-02 1.7754E-02 -8.0223E-03 3.0599E-03 S2 1.5107E-01 -1.8261E-01 4.1536E-02 -1.7267E-02 2.7441E-03 -3.1785E-03 -1.6303E-03 S3 -4.9674E-01 -4.2564E-02 -2.1016E-02 -1.5875E-02 -8.4419E-03 -3.9346E-03 -1.5165E-03 S4 -4.2648E-01 1.2143E-02 -1.8736E-02 -1.0246E-02 -3.8283E-03 -1.2892E-04 7.1536E-04 S5 -2.0030E-02 -4.9490E-03 -8.7737E-04 -2.8388E-05 2.9161E-05 2.9949E-05 6.4326E-06 S6 1.3418E-02 3.8043E-03 -1.4181E-03 8.7164E-04 -3.7296E-04 2.2381E-04 -9.5648E-05 S7 -1.3785E-01 2.6579E-02 -3.8407E-03 1.2238E-03 -4.5578E-04 2.1481E-04 -8.6137E-05 S8 -4.8814E-02 2.3728E-02 -1.2363E-03 4.8095E-04 -1.0695E-04 3.5415E-05 -5.7103E-06 S9 -1.4681E-01 1.5720E-02 1.6105E-03 1.8134E-03 5.0462E-04 2.8944E-04 7.3723E-05 S10 -4.7322E-01 1.5094E-02 -2.2401E-03 1.8309E-03 6.5808E-04 5.1191E-04 2.2455E-04 S11 -9.2644E-01 6.4823E-04 1.5089E-02 4.3540E-05 -6.3614E-04 9.4841E-04 6.2468E-04 S12 -2.9929E-01 4.1642E-02 2.3188E-02 -4.1573E-03 -1.1910E-03 1.1269E-03 4.5828E-04 S13 1.1208E+00 -1.2624E-01 4.1157E-03 5.5058E-03 -3.7605E-03 1.9414E-03 -2.8030E-03 S14 -6.1177E-01 1.9499E-02 -3.4539E-02 2.3930E-02 -1.5905E-02 8.2179E-03 -5.7708E-03 S15 -2.8222E+00 7.2210E-01 -1.9088E-01 4.7002E-02 -2.0407E-02 6.8866E-03 -3.8635E-03 S16 -3.5976E+00 4.1329E-01 -1.3692E-01 -1.1634E-02 -2.7526E-02 -2.3745E-03 -6.5798E-03

[0167] Table 10-1

[0168]

[0169]

[0170] Table 10-2

[0171] Parameter / Status Wide-angle End Status Mid-range End Status Telephoto End Status TTL (mm) 18.78 17.47 17.48 ImgH (mm) 5.27 5.27 5.27 FOV (°) 92.4 62.1 49.1 Fno 2.15 2.90 3.60 F (mm) 5.74 8.84 11.54 D4 (mm) 5.16 2.01 0.42 D12 (mm) 1.34 0.76 0.54 D16 (mm) 0.44 2.86 4.68 ET1 2.60 2.60 2.60 ET3 0.31 0.31 0.31 ET4 0.91 0.91 0.91 DT52 2.27 2.27 2.27 DT61 2.51 2.51 2.51

[0172] Table 10-3

[0173] Figures 26A to 26D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the wide-angle end state are respectively shown. Figures 28A to 28D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the middle-end state are respectively shown. Figures 30A to 30D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 in the telephoto end state are respectively shown. According to Figures 26A to 26D 、 Figures 28A to 28D and Figures 30A to 30D it can be seen that the optical imaging lens given in Embodiment 5 can achieve good imaging quality.

[0174] Example 6

[0175] The following Figures 31 to 36D describes the optical imaging lens according to Embodiment 6 of the present application. Figure 31 、 Figure 33 and Figure 35 respectively show the schematic structural diagrams of the optical imaging lens according to Embodiment 5 of the present application in the wide-angle end state, middle-end state, and telephoto end state.

[0176] As Figure 31 、 Figure 33 and Figure 35 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, 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. The first lens E1 has a negative focal power, its object surface S1 is concave, and its image surface S2 is concave. The second lens E2 has a positive focal power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is convex. The fourth lens E4 has a negative focal power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive focal power, its object surface S9 is convex, and its image surface S10 is convex. The sixth lens E6 has a positive focal power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative focal power, its object surface S13 is concave, and its image surface S14 is concave. The eighth lens E8 has a positive focal power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0177] Table 11 shows the basic parameters of the optical imaging lens of Example 6, where the units of curvature radius, thickness, and effective focal length are all in millimeters (mm). Tables 12-1 and 12-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 6, where the surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above. Table 12-3 shows some basic parameters of the optical imaging lens of Example 6 at the wide-angle end, intermediate end, and telephoto end.

[0178]

[0179] Table 11

[0180]

[0181]

[0182] Table 12-1

[0183] Plane number A18 A20 A22 A24 A26 A28 A30 S1 -1.0725E-03 5.8101E-04 -3.1766E-04 2.7810E-04 -2.3168E-04 1.1046E-04 -3.2984E-05 S2 -1.5493E-03 1.3047E-04 -2.9203E-04 2.0613E-04 3.1180E-04 1.0402E-04 2.2566E-05 S3 -6.4588E-04 3.7064E-04 8.7013E-05 2.8319E-04 2.9158E-04 8.0798E-05 1.0258E-06 S4 5.2207E-04 3.7820E-04 9.3209E-05 1.2131E-04 3.2909E-05 -2.3353E-05 1.0002E-05 S5 1.8483E-05 5.8168E-06 7.9745E-06 5.0132E-07 1.6380E-06 -2.7189E-06 1.2073E-06 S6 4.7595E-05 -1.7197E-05 9.1945E-06 -4.7973E-06 -4.0063E-06 -2.3755E-06 -2.3319E-06 S7 3.6083E-05 -1.2230E-05 5.0199E-06 -2.4690E-06 -3.3591E-06 -1.0299E-06 -1.5258E-06 S8 7.6724E-08 1.3846E-06 -1.4335E-06 1.8693E-06 -4.4181E-07 9.9120E-07 -1.3761E-06 S9 2.5444E-05 -9.3773E-07 2.3065E-06 -3.3283E-06 -4.8804E-07 -2.3193E-06 9.0100E-07 S10 1.1283E-04 4.6472E-05 2.1737E-05 9.1183E-06 4.6361E-06 4.6336E-08 -4.2193E-07 S11 2.3617E-05 -4.4407E-05 4.5575E-06 7.4987E-06 1.2125E-05 4.7491E-06 5.6439E-06 S12 -2.4402E-04 -7.0584E-05 2.3381E-05 3.1263E-05 1.1366E-05 4.1018E-06 -3.8593E-07 S13 9.9200E-04 -5.5426E-04 1.4030E-05 -1.1390E-04 -1.2127E-05 -7.1119E-05 4.8985E-06 S14 3.1552E-03 -1.5482E-03 6.4955E-04 -2.8112E-04 1.0435E-04 -1.0051E-04 8.5162E-05 S15 5.5287E-04 -1.6017E-03 3.3025E-04 3.0837E-04 5.1518E-04 4.5328E-05 -2.8782E-04 S16 4.1599E-03 -1.2430E-03 4.5113E-06 4.5881E-04 -2.1401E-04 4.5012E-05 -1.0508E-04

[0184] Table 12-2

[0185] Parameter / Status Wide-angle end status Middle end status Telephoto end status TTL (mm) 18.56 17.20 17.18 ImgH (mm) 5.27 5.27 5.27 FOV (°) 93.5 62.2 49.3 Fno 2.15 2.90 3.60 F (mm) 5.63 8.68 11.26 D4 (mm) 5.10 1.94 0.39 D12 (mm) 1.33 0.75 0.52 D16 (mm) 0.42 2.80 4.57 ET1 2.60 2.60 2.60 ET3 0.34 0.34 0.34 ET4 0.90 0.90 0.90 DT52 2.27 2.27 2.27 DT61 2.52 2.52 2.52

[0186] Table 12-3

[0187] Figures 32A to 32D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 6 at the wide-angle end state are shown respectively. Figures 34A to 34D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 6 at the intermediate end state are shown respectively. Figures 36A to 36D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 6 are shown respectively. Figures 32A to 32D 、 Figures 34A to 34D as well as Figures 36A to 36D It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0188] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0189] Conditional expression / Example 1 2 3 4 5 6 f2 / f8 1.54 1.51 1.23 1.24 1.36 1.32 FT / FW 2.30 2.05 1.72 1.71 2.01 2.00 (FT + FM + FW) / f8 1.54 1.55 1.29 0.97 1.60 1.53 f1 / f4 1.14 1.38 1.46 1.46 1.17 1.18 (f3 + f6) / f7 -2.25 -2.27 -1.87 -1.88 -2.15 -2.18 (R3 + R4) / (R5 + R6) -0.96 -1.71 -1.66 -1.66 -1.95 -1.99 (R12 - R11) / (R16 + R15) -1.44 -1.64 -1.97 -1.97 -1.60 -1.62 T12 / T34 7.11 12.12 11.13 11.37 11.00 11.85 (CT7 + CT8) / T78 1.84 1.80 2.06 2.05 2.01 1.90 (CT3 - CT5) / CT4 1.55 1.47 1.49 1.47 1.29 1.24 T45 / (CT5 + CT4) 1.26 1.32 1.48 1.48 1.22 1.22 ET1 / CT1 4.25 3.68 3.18 3.16 5.01 4.98 ET3 / ET4 0.48 0.45 0.27 0.29 0.34 0.37 DT61 / DT52 1.10 1.10 1.12 1.13 1.11 1.11

[0190] Table 13

[0191] The present application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0192] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that, It sequentially includes a first lens group and a second lens group from the object side to the image side along the optical axis; wherein, the first lens group includes: a first lens with a negative focal power and a second lens with a positive focal power; the second lens group includes: a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens, a sixth lens with a positive focal power, a seventh lens with a negative focal power, and an eighth lens with a positive focal power; wherein, The image side surface of the first lens is concave; The object side surface of the second lens is convex, and the image side surface is concave; The object side surface of the third lens is convex, and the image side surface is convex; The object side surface of the fourth lens is convex, and the image side surface is concave; The object side surface of the sixth lens is convex, and the image side surface is convex; The object side surface of the seventh lens is concave, and the image side surface is concave; The object side surface of the eighth lens is convex, and the image side surface is concave; The number of lenses with focal power in the optical imaging lens is eight; There is a spacing distance between any two adjacent lenses among the first lens to the eighth lens; The optical imaging lens is configured to continuously vary the focal length of the optical imaging lens by adjusting the spacing distance between the first lens group and the second lens group on the optical axis; And The effective focal length f2 of the second lens and the effective focal length f8 of the eighth lens satisfy: 1.23 ≤ f2 / f8 ≤ 1.

54.

2. The optical imaging lens according to claim 1, wherein, The air spacing T45 of the fourth lens and the fifth 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: 1.22 ≤ T45 / (CT5 + CT4) ≤ 1.

48.

3. The optical imaging lens according to claim 1, wherein, 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: 1.24 ≤ (CT3 - CT5) / CT4 ≤ 1.

55.

4. The optical imaging lens according to claim 1, wherein, The maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 10° ≤ Semi-FOV ≤ 46.75°.

5. The optical imaging lens according to claim 1, wherein, The effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.14 ≤ f1 / f4 ≤ 1.

46.

6. The optical imaging lens according to claim 1, wherein, The central thickness CT8 of the eighth lens on the optical axis is greater than the central thickness of any lens among the first lens to the seventh lens on the optical axis; and The central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the air spacing T78 of the seventh lens and the eighth lens on the optical axis satisfy: 1.80 ≤ (CT7 + CT8) / T78 ≤ 2.

06.

7. The optical imaging lens according to claim 1, wherein, When the spacing distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; When the spacing distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; The focal length FT of the optical imaging lens in the first state and the focal length FW of the optical imaging lens in the third state satisfy: 1.71 ≤ FT / FW ≤ 2.

30.

8. The optical imaging lens according to claim 1, wherein, When the distance between the first lens group and the second lens group on the optical axis is the smallest, the optical imaging lens is in the first state; When the distance between the first lens group and the second lens group on the optical axis is the largest, the optical imaging lens is in the third state; When the distance between the first lens group and the second lens group on the optical axis is between the minimum and the maximum, the optical imaging lens is in the second state; The focal length FT of the optical imaging lens in the first state, the focal length FM of the optical imaging lens in the second state, the focal length FW of the optical imaging lens in the third state and the effective focal length f8 of the eighth lens satisfy: 0.97 ≤ (FT + FM + FW) / f8 ≤ 1.

60.

9. The optical imaging lens according to any one of claims 1 to 8, wherein, The air gap T12 between the first lens and the second lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 7.11 ≤ T12 / T34 ≤ 12.

12.

10. The optical imaging lens according to any one of claims 1 to 8, wherein, The curvature radius R11 of the object side of the sixth lens, the curvature radius R12 of the image side of the sixth lens, the curvature radius R15 of the object side of the eighth lens and the curvature radius R16 of the image side of the eighth lens satisfy: -1.97 ≤ (R12 - R11) / (R16 + R15) ≤ -1.

44.

11. The optical imaging lens according to any one of claims 1 to 8, wherein, The edge thickness ET3 of the third lens and the edge thickness ET4 of the fourth lens satisfy: 0.27 ≤ ET3 / ET4 ≤ 0.

48.

12. The optical imaging lens according to any one of claims 1 to 8, wherein, The central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 3.16 ≤ ET1 / CT1 ≤ 5.

01.

13. The optical imaging lens according to any one of claims 1 to 8, wherein, The effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2.27 ≤ (f3 + f6) / f7 ≤ -1.

87.

14. The optical imaging lens according to any one of claims 1 to 8, wherein, The curvature radius R3 of the object side of the second lens, the curvature radius R4 of the image side of the second lens, 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: -1.99 ≤ (R3 + R4) / (R5 + R6) ≤ -0.

96.

15. The optical imaging lens according to any one of claims 1 to 8, wherein, Each of the first lens to the eighth lens is a plastic lens, and at least one of the lens surfaces of each of the first lens to the eighth lens is an aspherical lens surface.

16. The optical imaging lens according to any one of claims 1 to 8, wherein, The maximum effective radius DT52 of the image side of the fifth lens and the maximum effective radius DT61 of the object side of the sixth lens satisfy: 1.10 ≤ DT61 / DT52 ≤ 1.

13.

17. The optical imaging lens according to any one of claims 1 to 8, wherein, The refractive indices of the first lens, the second lens and the third lens are arranged in a combination of low refractive index, high refractive index and low refractive index in sequence.

Images