Imaging lens

Abstract

The present application discloses an imaging lens, which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens all have positive focal powers; the image side surface of the third lens is concave; the object side surface of the sixth lens is concave; the object side surface of the eighth lens is concave. There is an air gap between any two adjacent lenses among the first lens to the eighth lens.

Description

Technical Field

[0001] The present application relates to an imaging lens, and more particularly, to an imaging lens including eight lenses. Background Art

[0002] In recent years, with the development of science and technology, the market demand for imaging lenses suitable for portable electronic products has gradually increased. On the one hand, with the rapid development of mobile phone lens modules, especially the popularity of large-size, high-pixel CMOS chips, mobile phone manufacturers have put forward more stringent requirements on the imaging quality of lenses. On the other hand, with the improvement of CCD and CMOS component performance and the reduction of size, higher requirements are put forward for the high imaging quality and miniaturization of the matching imaging system.

[0003] In order to meet the needs of shooting, the requirements for pixels and imaging quality of the corresponding miniaturized imaging systems are gradually increasing, and imaging lenses are gradually developing towards large aperture, wide viewing angle and high resolution. Therefore, imaging lenses that can have both miniaturization and high imaging quality are the current pre-research direction. Summary of the invention

[0004] The present application provides an imaging lens that is applicable to portable electronic products and can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art.

[0005] On the one hand, the present application provides such an imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with optical power. Among them, the second lens, the sixth lens and the seventh lens can all have positive optical power; the image side surface of the third lens can be a concave surface; the object side surface of the sixth lens can be a concave surface; the object side surface of the eighth lens can be a concave surface. Among them, there can be an air gap between any two adjacent lenses from the first lens to the eighth lens.

[0006] In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the imaging lens may satisfy 0.5<f2 / f<1.3.

[0007] In one embodiment, half of the diagonal length of the effective pixel area on the imaging plane of the imaging lens ImgH and the effective focal length f6 of the sixth lens may satisfy 0<ImgH / f6<1.

[0008] In one embodiment, a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens may satisfy 0.3<|R6 / R5|<0.8.

[0009] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy 2 < (CT2 + CT1) / (CT2 - CT1) < 3.

[0010] In one embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R15 of the object side surface of the eighth lens may satisfy 0 < R15 / R11 < 1.

[0011] In one embodiment, the spacing distance T34 between the third lens and the fourth lens on the optical axis and the spacing distance T78 between the seventh lens and the eighth lens on the optical axis may satisfy 0 < T34 / T78 < 1.3.

[0012] In one embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens may satisfy 1.1 < f123 / f4567 < 2.

[0013] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and the effective focal length f7 of the seventh lens may satisfy 0.5 < TTL / f7 < 1.4.

[0014] In one embodiment, the sum ∑CT of the central thicknesses of the first lens to the eighth lens respectively on the optical axis and the sum ∑AT of the spacing distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis may satisfy 2 < ∑CT / ∑AT < 2.5.

[0015] In one embodiment, the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens may satisfy f / EPD < 2.

[0016] On the other hand, the present application provides such an imaging lens, which sequentially includes, 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 each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens may each have a positive focal power; the image side surface of the third lens may be concave; the object side surface of the sixth lens may be concave; the object side surface of the eighth lens may be concave. Among them, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens and the effective focal length f6 of the sixth lens may satisfy 0 < ImgH / f6 < 1.

[0017] On the other hand, the present application provides an imaging lens which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens can each have a positive focal power; the image side of the third lens can be concave; the object side of the sixth lens can be concave; the object side of the eighth lens can be concave. Among them, the effective focal length f2 of the second lens and the total effective focal length f of the imaging lens can satisfy 0.5 < f2 / f < 1.3.

[0018] On the other hand, the present application provides an imaging lens which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens can each have a positive focal power; the image side of the third lens can be concave; the object side of the sixth lens can be concave; the object side of the eighth lens can be concave. Among them, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens can satisfy 0.3 < |R6 / R5| < 0.8.

[0019] On the other hand, the present application provides an imaging lens which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens can each have a positive focal power; the image side of the third lens can be concave; the object side of the sixth lens can be concave; the object side of the eighth lens can be concave. Among them, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis can satisfy 2 < (CT2 + CT1) / (CT2 - CT1) < 3.

[0020] On the other hand, the present application provides an imaging lens which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens can each have a positive focal power; the image side of the third lens can be concave; the object side of the sixth lens can be concave; the object side of the eighth lens can be concave. Among them, the sum ∑CT of the central thicknesses of the first lens to the eighth lens on the optical axis and the sum ∑AT of the spacing distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis can satisfy 2 < ∑CT / ∑AT < 2.5.

[0021] On the other hand, the present application provides an imaging lens, which sequentially includes, 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, each having a focal power. Among them, the second lens, the sixth lens, and the seventh lens can all have a positive focal power; the image side surface of the third lens can be concave; the object side surface of the sixth lens can be concave; the object side surface of the eighth lens can be concave. Among them, the combined focal length f123 of the first lens, the second lens, and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens can satisfy 1.1 < f123 / f4567 < 2.

[0022] The present application uses eight lenses. By reasonably distributing the focal power, surface type, central thickness of each lens, and the on-axis spacing between each lens, etc., the above optical lens group has at least one beneficial effect such as miniaturization, ultra-thinness, large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] With reference to the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of the present application will become more obvious. In the drawings:

[0024] Figure 1 shows a schematic structural diagram of an imaging lens according to Embodiment 1 of the present application;

[0025] Figures 2A to 2D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 1;

[0026] Figure 3 shows a schematic structural diagram of an imaging lens according to Embodiment 2 of the present application;

[0027] Figures 4A to 4D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 2;

[0028] Figure 5 shows a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application;

[0029] Figures 6A to 6D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 3;

[0030] Figure 7 shows a schematic structural diagram of an imaging lens according to Embodiment 4 of the present application;

[0031] Figures 8A to 8D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 4;

[0032] Figure 9 Shows a schematic structural diagram of an imaging lens according to Embodiment 5 of the present application;

[0033] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 5;

[0034] Figure 11 Shows a schematic structural diagram of an imaging lens according to Embodiment 6 of the present application;

[0035] Figures 12A to 12D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 6;

[0036] Figure 13 Shows a schematic structural diagram of an imaging lens according to Embodiment 7 of the present application;

[0037] Figures 14A to 14D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 7;

[0038] Figure 15 Shows a schematic structural diagram of an imaging lens according to Embodiment 8 of the present application;

[0039] Figures 16A to 16D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 8;

[0040] Figure 17 Shows a schematic structural diagram of an imaging lens according to Embodiment 9 of the present application;

[0041] Figures 18A to 18D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 9;

[0042] Figure 19 Shows a schematic structural diagram of an imaging lens according to Embodiment 10 of the present application;

[0043] Figures 20A to 20D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the imaging lens of Embodiment 10. Detailed implementation manners

[0044] 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.

[0045] 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 features. 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.

[0046] 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 only examples and are not drawn to an exact scale.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 accompanying drawings and in combination with the embodiments.

[0051] The features, principles and other aspects of the present application will be described in detail below.

[0052] The imaging lens according to an exemplary embodiment of the present application may include, for example, eight lenses having optical powers, namely, 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. These eight lenses are arranged in order from the object side to the image side along the optical axis. An air gap may be provided between any two adjacent lenses among the first lens to the eighth lens.

[0053] In the exemplary embodiment, the first lens has an optical power; the second lens may have a positive optical power; the third lens has an optical power, and its image side may be concave; the fourth lens has an optical power; the fifth lens has an optical power; the sixth lens may have a positive optical power, and its object side may be concave; the seventh lens may have a positive optical power; the eighth lens has an optical power, and its object side may be concave. By reasonably distributing the positive and negative of the optical powers of the respective components of the control system and the light incident amount, the low-order aberrations of the control system are effectively balanced, and at the same time, by controlling the full field of view angle, the imaging range of the control system is effectively controlled.

[0054] In the exemplary embodiment, the object side of the first lens may be convex and the image side may be concave; the object side of the second lens may be convex; the third lens may have a negative optical power, and its object side may be convex; the object side of the fifth lens may be convex and the image side may be concave; the image side of the sixth lens may be convex; the object side of the seventh lens may be convex; the eighth lens may have a negative optical power, and its image side may be concave.

[0055] In the exemplary embodiment, the imaging lens according to the present application may satisfy the condition f / EPD < 2, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens. More specifically, f and EPD may further satisfy 1.80 ≤ f / EPD ≤ 1.98. The configuration in which the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy f / EPD < 2 can, during the process of increasing the light passing amount, enable the system to have the advantages of a large aperture and a large aperture diameter, thereby reducing the aberrations of the edge field of view while enhancing the imaging effect in a dark environment, making the system have low sensitivity.

[0056] In an exemplary embodiment, the imaging lens according to the present application can satisfy the conditional expression 0.5 < f2 / f < 1.3, where f2 is the effective focal length of the second lens and f is the total effective focal length of the imaging lens. More specifically, f2 and f can further satisfy 0.87 ≤ f2 / f ≤ 0.92. Controlling the optical power of the second lens within a reasonable range can effectively control the overall focal length of the imaging lens and, at the same time, play a role in balancing the field curvature.

[0057] In an exemplary embodiment, the imaging lens according to the present application can satisfy the conditional expression 0 < ImgH / f6 < 1, where ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the imaging lens and f6 is the effective focal length of the sixth lens. More specifically, ImgH and f6 can further satisfy 0.4 < ImgH / f6 < 0.7. For example, 0.48 ≤ ImgH / f6 ≤ 0.61. By reasonably controlling ImgH and f6, the total size of the imaging system can be effectively compressed to achieve miniaturization of the imaging system.

[0058] In an exemplary embodiment, the imaging lens according to the present application can satisfy the conditional expression 0.3 < |R6 / R5| < 0.8, 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. More specifically, R6 and R5 can further satisfy 0.52 ≤ |R6 / R5| ≤ 0.61. By reasonably configuring the curvature radii of the lenses, spherical aberration of the optical lens group can be effectively eliminated to obtain high-definition images.

[0059] In an exemplary embodiment, the imaging lens according to the present application can satisfy the conditional expression 2 < (CT2 + CT1) / (CT2 - CT1) < 3, where CT1 is the central thickness of the first lens on the optical axis and CT2 is the central thickness of the second lens on the optical axis. More specifically, CT1 and CT2 can further satisfy 2.14 ≤ (CT2 + CT1) / (CT2 - CT1) ≤ 2.73. Reasonably controlling the central thickness of the first lens on the optical axis and the central thickness of the second lens on the optical axis helps to make the lens size distribution uniform, ensure assembly stability, and helps to reduce the aberration of the entire imaging lens and shorten the total length of the imaging lens.

[0060] In an exemplary embodiment, the imaging lens according to the present application can satisfy the conditional expression 0 < R15 / R11 < 1, where R11 is the curvature radius of the object side surface of the sixth lens and R15 is the curvature radius of the object side surface of the eighth lens. More specifically, R11 and R15 can further satisfy 0.4 < R15 / R11 < 0.8. For example, 0.49 ≤ R15 / R11 ≤ 0.77. By reasonably setting the curvature radius of the object side surface of the sixth lens and the curvature radius of the object side surface of the eighth lens, it is convenient to control the deflection angle of light, enabling the system to easily match common chips.

[0061] In an exemplary embodiment, the imaging lens according to the present application may satisfy the conditional formula 0 < T34 / T78 < 1.3, where T34 is the distance between the third lens and the fourth lens on the optical axis, and T78 is the distance between the seventh lens and the eighth lens on the optical axis. More specifically, T34 and T78 may further satisfy 0.5 < T34 / T78 < 1.1. For example, 0.69 ≤ T34 / T78 ≤ 1.06. By reasonably configuring the air spaces between the third lens and the fourth lens, and between the seventh lens and the eighth lens on the optical axis, the thickness sensitivity of the lens can be effectively reduced and the field curvature can be corrected.

[0062] In an exemplary embodiment, the imaging lens according to the present application may satisfy the conditional formula 2 < ∑CT / ∑AT < 2.5, where ∑CT is the sum of the central thicknesses of the first lens to the eighth lens on the optical axis respectively, and ∑AT is the sum of the distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis. More specifically, ∑CT and ∑AT may further satisfy 2.10 ≤ ∑CT / ∑AT ≤ 2.28. By effectively controlling the central thicknesses of the lenses in the system and the air spaces between any two adjacent lenses with optical power on the optical axis, the balance between the edge thickness and the central thickness of each lens is made stable, the space utilization rate is improved, the lens processing and assembly difficulties are reduced, while ensuring the miniaturization of the lens, the aberration correction ability of the system is enhanced.

[0063] In an exemplary embodiment, the imaging lens according to the present application may satisfy the conditional formula 1.1 < f123 / f4567 < 2, where f123 is the combined focal length of the first lens, the second lens and the third lens, and f4567 is the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens. More specifically, f123 and f4567 may further satisfy 1.58 ≤ f123 / f4567 ≤ 1.77. By reasonably configuring the optical power of the system, the distortion in the paraxial range of the image plane can be effectively corrected, thereby improving the imaging quality of the system.

[0064] In an exemplary embodiment, the imaging lens according to the present application may satisfy the conditional formula 0.5 < TTL / f7 < 1.4, where TTL is the distance from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, and f7 is the effective focal length of the seventh lens. More specifically, TTL and f7 may further satisfy 0.82 ≤ TTL / f7 ≤ 1.14. By reasonably controlling the total optical length of the imaging lens and the effective focal length of the seventh lens, the total size of the imaging lens can be effectively compressed to achieve the ultra-thin characteristic and miniaturization of the imaging lens, so that the above imaging lens can be better applied to a system with limited size.

[0065] In an exemplary embodiment, the above imaging lens may further include a diaphragm to improve the imaging quality of the lens group. The diaphragm may be disposed between the object side and the first lens.

[0066] 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.

[0067] The imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the lens can be effectively reduced, the sensitivity of the lens can be decreased, and the processability of the lens can be improved, making the imaging lens more conducive to production and processing and applicable to portable electronic products. The imaging lens configured as above may also have beneficial effects such as ultra-thin, large aperture, and high imaging quality.

[0068] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface and the image side surface 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. The characteristics of an aspherical lens are that the curvature changes continuously 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 curvature radius 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, both the object side surface and the image side surface 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.

[0069] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the imaging lens may 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 imaging lens is not limited to including eight lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0070] The following further describes a specific embodiment of the imaging lens applicable to the above embodiment with reference to the drawings.

[0071] Example 1

[0072] The following refers to Figures 1 to 2D Describe the imaging lens according to Embodiment 1 of the present application. Figure 1 A schematic structural diagram of the imaging lens according to Embodiment 1 of the present application is shown.

[0073] As shown Figure 1 in FIG. 1, an imaging lens according to an exemplary embodiment of the present application 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.

[0074] The first lens E1 has a negative focal power, its object surface S1 is convex, 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 negative focal power, its object surface S5 is convex, and its image surface S6 is concave. 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 negative 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 concave, and its image surface S12 is convex. The seventh lens E7 has a positive focal power, its object surface S13 is convex, and its image surface S14 is concave. The eighth lens E8 has a negative focal power, its object surface S15 is concave, 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.

[0075] Table 1 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 1, where the units of the curvature radius and thickness are both millimeters (mm).

[0076]

[0077]

[0078] Table 1

[0079] As can be seen from Table 1, the object surface and the image surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. In this embodiment, the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0080]

[0081] where x is the sagitta, the distance from the vertex of the aspherical surface at the position where the height is h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient (given in Table 1); Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order term coefficients A that can be used for the aspherical surfaces S1 - S16 in Example 14 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 .

[0082]

[0083]

[0084] Table 2

[0085] Table 3 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of each lens in Example 1.

[0086] ImgH (mm) 3.08 f3 (mm) -8.88 TTL (mm) 4.79 f4 (mm) -34.49 HFOV (°) 41.3 f5 (mm) -30.06 Fno 1.98 f6 (mm) 5.01 f (mm) 3.50 f7 (mm) 5.82 f1 (mm) -49.03 f8 (mm) -2.70 f2 (mm) 3.20

[0087] Table 3

[0088] The imaging lens in Example 1 satisfies:

[0089] f / EPD = 1.98, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens;

[0090] f2 / f = 0.91, where f2 is the effective focal length of the second lens E2 and f is the total effective focal length of the imaging lens;

[0091] ImgH / f6 = 0.61, where ImgH is half of the diagonal length of the effective pixel region on the imaging surface S19 and f6 is the effective focal length of the sixth lens E6;

[0092] |R6 / R5| = 0.61, where R5 is the radius of curvature of the object side surface S5 of the third lens E3 and R6 is the radius of curvature of the image side surface S6 of the third lens E3;

[0093] (CT2 + CT1) / (CT2 - CT1) = 2.63, where CT1 is the central thickness of the first lens E1 on the optical axis and CT2 is the central thickness of the second lens E2 on the optical axis;

[0094] R15 / R11 = 0.49, where R11 is the radius of curvature of the object side surface S11 of the sixth lens E6 and R15 is the radius of curvature of the object side surface S15 of the eighth lens E8;

[0095] T34 / T78 = 0.69, where T34 is the distance between the third lens E3 and the fourth lens E4 on the optical axis, and T78 is the distance between the seventh lens E7 and the eighth lens E8 on the optical axis;

[0096] ∑CT / ∑AT = 2.14, where ∑CT is the sum of the central thicknesses of the first lens E1 to the eighth lens E8 on the optical axis respectively, and ∑AT is the sum of the distances between any two adjacent lenses among the first lens E1 to the eighth lens E8 on the optical axis;

[0097] f123 / f4567 = 1.61, where f123 is the combined focal length of the first lens E1, the second lens E2, and the third lens E3, and f4567 is the combined focal length of the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7;

[0098] TTL / f7 = 0.82, where TTL is the distance from the object side surface S1 of the first lens E1 to the imaging surface S19 on the optical axis, and f7 is the effective focal length of the seventh lens E7.

[0099] Figure 2A The axial chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curve of the imaging lens of Embodiment 1 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 2D The lateral chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 2A to 2D It can be seen that the imaging lens given in Embodiment 1 can achieve good imaging quality.

[0100] Example 2

[0101] The following refers to Figures 3 to 4D Describe the 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 3 The structural schematic diagram of the imaging lens according to Embodiment 2 of the present application is shown.

[0102] As Figure 3 shown, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a diaphragm 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.

[0103] The first lens E1 has a negative focal power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive focal power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative focal power, its object side S7 is convex, and its image side S8 is concave. 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. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0104] Table 4 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the lenses of the imaging lens of Example 2, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0105]

[0106] Table 4

[0107] As can be seen from Table 4, in Example 2, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces. Table 5 shows the higher-order term coefficients of the aspherical surfaces that can be used in Example 2, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0108] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.1234E-01 1.9078E-02 -2.7856E-03 5.0379E-03 5.9393E-03 -8.1504E-04 2.7585E-04 S2 -2.3796E-01 1.1256E-01 -4.9457E-03 3.6622E-03 5.4669E-03 -4.4079E-04 1.1285E-04 S3 -1.4007E-01 2.8707E-02 2.1642E-03 -2.6888E-03 -1.3760E-03 -2.6555E-04 -1.7841E-04 S4 -1.6921E-01 4.3343E-02 -5.4880E-04 -4.2163E-05 8.9260E-04 -2.4472E-03 1.1124E-04 S5 -1.7554E-01 9.5638E-02 9.7281E-04 -2.0006E-03 -1.2403E-03 4.7081E-04 2.2634E-05 S6 -4.1342E-02 4.1814E-02 -2.1081E-03 -2.2730E-03 3.9702E-04 1.9762E-03 7.4142E-05 S7 -2.2955E-01 5.0660E-01 -1.3395E+00 2.1727E+00 -1.9792E+00 9.8265E-01 -2.1026E-01 S8 -2.1341E-01 4.5780E-01 -1.1963E+00 1.7942E+00 -1.4465E+00 6.1266E-01 -1.0859E-01 S9 -1.5152E-01 1.1325E-02 1.4577E-03 1.6024E-01 -2.1153E-01 1.1144E-01 -2.2318E-02 S10 -1.7312E-01 4.8958E-02 8.6488E-02 -1.3732E-01 9.2683E-02 -2.7303E-02 2.3356E-03 S11 4.8231E-02 4.7209E-02 -1.4489E-01 1.5134E-01 -7.4482E-02 1.7482E-02 -1.5736E-03 S12 2.7813E-02 -3.5826E-02 9.8033E-02 -8.8253E-02 4.9601E-02 -1.5298E-02 1.9098E-03 S13 -7.7615E-02 -3.4605E-02 5.0714E-02 -3.4024E-02 1.1902E-02 -2.1897E-03 1.7383E-04 S14 -5.1481E-03 -1.7532E-02 1.2893E-02 -8.1610E-03 2.6815E-03 -4.1779E-04 2.5368E-05 S15 -2.0460E-02 3.3780E-02 -1.8005E-02 7.1143E-03 -1.5712E-03 1.7278E-04 -7.3208E-06 S16 -4.7431E-02 2.6330E-03 2.0865E-03 -9.1013E-04 1.7088E-04 -1.5500E-05 5.3923E-07

[0109] Table 5

[0110] Table 6 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Example 2, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S19 on the optical axis, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.

[0111] ImgH (mm) 3.08 f3 (mm) -8.12 TTL (mm) 4.72 f4 (mm) -26.61 HFOV (°) 41.8 f5 (mm) -43.73 Fno 1.98 f6 (mm) 5.05 f (mm) 3.44 f7 (mm) 5.65 f1 (mm) -65.49 f8 (mm) -2.69 f2 (mm) 3.14

[0112] Table 6

[0113] Figure 4A Shows the axial chromatic aberration curve of the imaging lens of Example 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4BThe astigmatism curve of the imaging lens according to Embodiment 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4C The distortion curve of the imaging lens according to Embodiment 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4D The longitudinal chromatic aberration curve of the imaging lens according to Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4A to 4D it can be known that the imaging lens given in Embodiment 2 can achieve good imaging quality.

[0114] Example 3

[0115] The following refers to Figures 5 to 6D the imaging lens according to Embodiment 3 of the present application is described. Figure 5 The structural schematic diagram of the imaging lens according to Embodiment 3 of the present application is shown.

[0116] As Figure 5 shown, the imaging lens according to the exemplary embodiment of the present application 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.

[0117] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a convex surface. The third lens E3 has a negative optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a negative optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a concave surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a concave surface. The eighth lens E8 has a negative optical power, its object side surface S15 is a concave surface, and its image side surface S16 is a concave surface. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through each surface S1 to S18 and finally forms an image on the imaging surface S19.

[0118] Table 7 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens according to Embodiment 3, where the units of the curvature radius and the thickness are both millimeters (mm).

[0119]

[0120]

[0121] Table 7

[0122] As can be seen from Table 7, in Embodiment 3, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 8 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0123] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.2032E-01 4.5870E-02 -1.0177E-01 2.2887E-01 -2.8196E-01 2.1949E-01 -7.5398E-02 S2 -2.4062E-01 1.3488E-01 -4.5063E-02 4.0592E-02 3.7209E-02 -5.9510E-02 2.3457E-02 S3 -1.3876E-01 2.9015E-02 3.0029E-03 -2.2917E-03 -2.0380E-03 -2.0280E-03 -1.7841E-04 S4 -1.7030E-01 4.3197E-02 -1.3268E-04 2.9546E-04 2.9959E-04 -4.1863E-03 1.1124E-04 S5 -1.7410E-01 9.5934E-02 5.7289E-04 -2.4976E-03 -1.1560E-03 1.4057E-03 2.2634E-05 S6 -4.3204E-02 4.1079E-02 -2.5663E-03 -2.2897E-03 5.4314E-04 2.0012E-03 6.4576E-05 S7 -2.2317E-01 4.7155E-01 -1.3016E+00 2.2442E+00 -2.1624E+00 1.1347E+00 -2.5649E-01 S8 -1.9867E-01 3.7755E-01 -1.0623E+00 1.7053E+00 -1.4527E+00 6.4956E-01 -1.2165E-01 S9 -1.5143E-01 1.1362E-02 1.4572E-03 1.6025E-01 -2.1151E-01 1.1147E-01 -2.2296E-02 S10 -1.7234E-01 4.9700E-02 8.6731E-02 -1.3727E-01 9.2673E-02 -2.7322E-02 2.3197E-03 S11 7.8132E-02 -3.4812E-02 -2.3897E-02 4.7940E-02 -2.2394E-02 3.1046E-03 9.4302E-05 S12 2.3320E-02 -3.6939E-02 1.0819E-01 -9.8369E-02 5.7267E-02 -1.8522E-02 2.4183E-03 S13 -9.1802E-02 -2.8712E-02 3.7840E-02 -2.3105E-02 6.8082E-03 -9.7363E-04 6.4207E-05 S14 1.3111E-02 -3.8848E-02 2.2020E-02 -9.9975E-03 2.5747E-03 -2.8785E-04 8.6755E-06 S15 -2.2391E-02 3.6222E-02 -1.7063E-02 6.1813E-03 -1.3249E-03 1.4531E-04 -6.2640E-06 S16 -6.8690E-02 1.6849E-02 -3.8197E-03 6.5282E-04 -8.1025E-05 6.7110E-06 -2.7825E-07

[0124] Table 8

[0125] Table 9 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Embodiment 3, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S19 on the optical axis, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of each lens.

[0126] ImgH (mm) 3.08 f3 (mm) -6.72 TTL (mm) 4.64 f4 (mm) -23.72 HFOV (°) 42.3 f5 (mm) -87.39 Fno 1.98 f6 (mm) 5.27 f (mm) 3.38 f7 (mm) 5.01 f1 (mm) 663.67 f8 (mm) -2.51 f2 (mm) 3.05

[0127] Table 9

[0128] Figure 6A Shows the axial chromatic aberration curve of the imaging lens in 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 imaging lens in Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6C Shows the distortion curve of the imaging lens in Embodiment 3, which represents the distortion magnitude values under different image heights. Figure 6D Shows the lateral chromatic aberration curve of the imaging lens in Embodiment 3, which represents the deviation of different image heights on the imaging surface after light rays pass through the lens. According to Figures 6A to 6D it can be seen that the imaging lens given in Embodiment 3 can achieve good imaging quality.

[0129] Example 4

[0130] The following refers to Figures 7 to 8D to describe the imaging lens according to Embodiment 4 of the present application. Figure 7 Shows a schematic structural diagram of the imaging lens according to Embodiment 4 of the present application.

[0131] As Figure 7 shown, the imaging lens according to the exemplary embodiment of the present application 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.

[0132] 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 positive optical power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative 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 convex, and its image side S8 is concave. The fifth lens E5 has a positive 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 S1 to S18 and finally forms an image on the imaging surface S19.

[0133] Table 10 shows the surface types, curvature radii, thicknesses, materials, and conic coefficients of the lenses of the imaging lens according to Embodiment 4, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0134]

[0135] Table 10

[0136] As can be seen from Table 10, in Embodiment 4, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces. Table 11 shows the high-order term coefficients of the aspherical surfaces that can be used in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0137]

[0138]

[0139] Table 11

[0140] Table 12 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Embodiment 4, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.

[0141] ImgH (mm) 3.08 f3 (mm) -6.82 TTL (mm) 4.52 f4 (mm) -15.78 HFOV (°) 43.3 f5 (mm) 78.62 Fno 1.98 f6 (mm) 5.59 f (mm) 3.27 f7 (mm) 4.43 f1 (mm) 126.71 f8 (mm) -2.38 f2 (mm) 3.01

[0142] Table 12

[0143] Figure 8A Shows the axial chromatic aberration curve of the imaging lens according to Embodiment 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens.Figure 8B The astigmatism curve of the imaging lens of Example 4 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 8C The distortion curve of the imaging lens of Example 4 is shown, which represents the distortion magnitude values under different image heights. Figure 8D The longitudinal chromatic aberration curve of the imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8A to 8D it can be seen that the imaging lens given in Example 4 can achieve good imaging quality.

[0144] Example 5

[0145] The following refers to Figures 9 to 10D the imaging lens according to Embodiment 5 of the present application is described. Figure 9 The schematic structural diagram of the imaging lens according to Embodiment 5 of the present application is shown.

[0146] As Figure 9 shown, the imaging lens according to the exemplary embodiment of the present application 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 surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has a negative optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has a positive optical power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has a negative optical power, its object side surface S15 is concave, and its image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0148] Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 5, where the units of the radius of curvature and the thickness are both millimeters (mm).

[0149]

[0150]

[0151] Table 13

[0152] As can be seen from Table 13, in Example 5, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 14 shows 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 formula (1) given in Example 1 above.

[0153] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.3945E-01 9.8219E-02 -2.9598E-01 8.2622E-01 -1.2783E+00 1.1389E+00 -4.3968E-01 S2 -2.6055E-01 1.9825E-01 -2.0002E-01 5.0898E-01 -6.9750E-01 5.6000E-01 -1.9796E-01 S3 -1.4956E-01 7.0856E-02 -1.5919E-01 4.3928E-01 -5.9651E-01 3.6927E-01 -9.2985E-02 S4 -1.7175E-01 5.7063E-02 -1.2523E-01 4.9879E-01 -8.3938E-01 6.2699E-01 -1.8087E-01 S5 -1.8380E-01 1.2996E-01 -1.8199E-01 6.3017E-01 -1.0697E+00 8.2266E-01 -2.3101E-01 S6 -5.9311E-02 6.4816E-02 -4.3991E-02 8.5672E-02 -1.0272E-01 4.4306E-02 2.4367E-03 S7 -1.9019E-01 2.5204E-01 -6.9876E-01 1.3134E+00 -1.4197E+00 9.3085E-01 -2.7678E-01 S8 -8.4906E-02 -3.6431E-01 1.1510E+00 -1.8404E+00 1.5445E+00 -5.6429E-01 5.2870E-02 S9 -1.2701E-01 -5.2906E-01 2.0735E+00 -3.6203E+00 3.4486E+00 -1.6879E+00 3.3021E-01 S10 -2.2233E-01 1.9363E-01 -9.5244E-02 -1.3979E-01 3.0413E-01 -1.9625E-01 4.2875E-02 S11 1.2340E-01 -2.3330E-02 -2.4502E-01 4.0563E-01 -2.7739E-01 9.0802E-02 -1.1936E-02 S12 1.8712E-02 -1.1368E-01 2.7812E-01 -2.4964E-01 1.3378E-01 -3.9589E-02 4.7836E-03 S13 -9.5516E-02 -9.4644E-02 1.0568E-01 -8.0868E-02 3.2667E-02 -5.9792E-03 3.9536E-04 S14 8.9858E-02 -1.3057E-01 5.5976E-02 -1.7158E-02 4.4894E-03 -7.3456E-04 4.7497E-05 S15 -2.3127E-02 3.8491E-02 -1.2241E-02 2.2849E-03 -2.6204E-04 1.7263E-05 -4.7426E-07 S16 -1.0256E-01 3.1365E-02 -7.3531E-03 1.3943E-03 -2.2494E-04 2.3728E-05 -1.0513E-06

[0154] Table 14

[0155] Table 15 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Example 5, the distance TTL on the optical axis from the object side of the first lens E1 to the imaging surface S19, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of each lens.

[0156] ImgH (mm) 3.08 f3 (mm) -6.37 TTL (mm) 4.39 f4 (mm) 1086.38 HFOV (°) 43.7 f5 (mm) -25.85 Fno 1.98 f6 (mm) 5.89 f (mm) 3.19 f7 (mm) 4.45 f1 (mm) 196.34 f8 (mm) -2.39 f2 (mm) 2.89

[0157] Table 15

[0158] Figure 10A Shows the axial chromatic aberration curve of the imaging lens in Example 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10B Shows the astigmatism curve of the imaging lens in Example 5, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 10C Shows the distortion curve of the imaging lens in Example 5, which represents the distortion magnitude values under different image heights. Figure 10D Shows the lateral chromatic aberration curve of the imaging lens in Example 5, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 10A to 10D it can be seen that the imaging lens given in Example 5 can achieve good imaging quality.

[0159] Example 6

[0160] The following refers to Figures 11 to 12D and describes the imaging lens according to Embodiment 6 of the present application. Figure 11 Shows a schematic structural diagram of the imaging lens according to Embodiment 6 of the present application.

[0161] As Figure 11 shown, the imaging lens according to the exemplary embodiment of the present application 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.

[0162] 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 positive focal power, with its object side S3 being convex and its image side S4 being convex. The third lens E3 has a negative focal power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a negative focal power, with its object side S7 being convex and its image side S8 being concave. 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 positive 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 convex. The eighth lens E8 has a negative focal power, with its object side S15 being concave and its image side S16 being concave. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0163] Table 16 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the lenses of the imaging lens according to Embodiment 6, where the units of the radii of curvature and thicknesses are both millimeters (mm).

[0164]

[0165]

[0166] Table 16

[0167] As can be seen from Table 16, in Embodiment 6, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 17 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 6, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0168] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.4162E-01 9.0367E-02 -1.9093E-01 3.6590E-01 -3.2705E-01 1.3882E-01 -1.7097E-02 S2 -2.5749E-01 1.9760E-01 -2.3446E-01 5.5848E-01 -7.8299E-01 6.2781E-01 -2.1501E-01 S3 -1.4431E-01 6.9830E-02 -1.6938E-01 4.5128E-01 -6.2356E-01 4.1398E-01 -1.1838E-01 S4 -2.1418E-01 3.2955E-01 -8.2760E-01 1.5302E+00 -1.7704E+00 1.1168E+00 -2.9903E-01 S5 -2.1754E-01 3.6742E-01 -6.9390E-01 1.1984E+00 -1.4319E+00 9.4886E-01 -2.5092E-01 S6 -6.2446E-02 7.7318E-02 2.6743E-02 -1.5907E-01 2.0346E-01 -1.3542E-01 4.4345E-02 S7 -1.6559E-01 1.3634E-01 -4.1152E-01 8.3089E-01 -8.1581E-01 4.7032E-01 -1.3260E-01 S8 -1.0290E-01 -1.7782E-01 2.7641E-01 -3.4297E-02 -2.1939E-01 2.2228E-01 -7.0604E-02 S9 -1.5359E-01 -2.1891E-01 7.4367E-01 -8.9132E-01 5.7565E-01 -1.9117E-01 2.4434E-02 S10 -1.8938E-01 5.6579E-02 1.3328E-01 -2.5068E-01 2.1816E-01 -9.2681E-02 1.5058E-02 S11 1.1896E-01 -1.2034E-01 4.9537E-02 2.6710E-02 -2.5055E-02 5.1371E-03 -9.2452E-05 S12 2.1163E-02 -5.7414E-02 1.4622E-01 -1.2865E-01 7.6997E-02 -2.6532E-02 3.6931E-03 S13 -8.7726E-02 -2.3280E-02 2.4053E-02 -2.3077E-02 1.0165E-02 -2.0451E-03 1.7920E-04 S14 6.7375E-02 -5.2536E-02 -5.5842E-04 7.5427E-03 -2.8899E-03 5.8355E-04 -5.1181E-05 S15 -2.5045E-02 2.9876E-02 -4.4683E-03 -1.3368E-04 1.2771E-04 -1.6630E-05 8.5760E-07 S16 -1.1491E-01 4.4088E-02 -1.3625E-02 2.9835E-03 -4.3767E-04 3.8028E-05 -1.4509E-06

[0169] Table 17

[0170] Table 18 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Embodiment 6, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.

[0171] ImgH (mm) 3.08 f3 (mm) -6.47 TTL (mm) 4.52 f4 (mm) -18.43 HFOV (°) 42.4 f5 (mm) -3115.99 Fno 1.91 f6 (mm) 5.56 f (mm) 3.28 f7 (mm) 4.01 f1 (mm) 301.28 f8 (mm) -2.21 f2 (mm) 2.90

[0172] Table 18

[0173] Figure 12AShows the axial chromatic aberration curve of the imaging lens of Embodiment 6, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 12B Shows the astigmatism curve of the imaging lens of Embodiment 6, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 12C Shows the distortion curve of the imaging lens of Embodiment 6, which represents the distortion magnitude values under different image heights. Figure 12D Shows the lateral chromatic aberration curve of the imaging lens of Embodiment 6, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 12A to 12D it can be known that the imaging lens given in Embodiment 6 can achieve good imaging quality.

[0174] Example 7

[0175] The following refers to Figures 13 to 14D describes the imaging lens according to Embodiment 7 of the present application. Figure 13 Shows a schematic structural diagram of the imaging lens according to Embodiment 7 of the present application.

[0176] As Figure 13 shown, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a diaphragm 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.

[0177] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a convex surface. The third lens E3 has a negative optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a concave surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a negative optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a concave surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a concave surface. The eighth lens E8 has a negative optical power, its object side surface S15 is a concave surface, and its image side surface S16 is a concave surface. The filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through each surface S1 to S18 and finally forms an image on the imaging surface S19.

[0178] Table 19 shows the surface types, curvature radii, thicknesses, materials, and conic coefficients of the lenses of the imaging lens of Embodiment 7, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0179]

[0180] Table 19

[0181] As can be seen from Table 19, in Example 7, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 20 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Example 7, where each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0182] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.3715E-01 8.8176E-02 -1.8854E-01 3.5344E-01 -3.0251E-01 1.0970E-01 -4.9152E-03 S2 -2.6678E-01 2.2453E-01 -2.6219E-01 5.8853E-01 -8.0970E-01 6.2126E-01 -1.9660E-01 S3 -1.5815E-01 9.6131E-02 -1.5813E-01 4.0842E-01 -5.8064E-01 3.6165E-01 -8.8334E-02 S4 -2.1344E-01 3.3189E-01 -7.2611E-01 1.1616E+00 -1.2626E+00 7.7938E-01 -2.0665E-01 S5 -2.3580E-01 3.9195E-01 -5.6469E-01 7.3479E-01 -8.4121E-01 6.0580E-01 -1.7131E-01 S6 -7.6026E-02 6.9148E-02 2.0204E-01 -6.4073E-01 8.5330E-01 -5.7256E-01 1.6184E-01 S7 -1.2769E-01 -3.2931E-02 -5.1583E-02 4.0233E-01 -6.0154E-01 5.3460E-01 -2.0498E-01 S8 -6.2394E-02 -4.7298E-01 1.2422E+00 -1.7908E+00 1.5384E+00 -6.6591E-01 1.0454E-01 S9 -1.8208E-01 -2.5992E-01 1.2226E+00 -2.1406E+00 2.0681E+00 -1.0332E+00 2.0536E-01 S10 -2.1831E-01 1.7553E-01 -9.1295E-02 -6.0175E-02 1.6487E-01 -1.0462E-01 2.1357E-02 S11 1.4581E-01 -1.7630E-01 6.2784E-02 1.0809E-01 -1.2455E-01 5.0847E-02 -7.7539E-03 S12 3.2304E-02 -1.2184E-01 2.5497E-01 -2.0934E-01 1.0559E-01 -3.0049E-02 3.5092E-03 S13 -8.3567E-02 -7.1106E-02 8.9228E-02 -7.2377E-02 2.8067E-02 -4.5578E-03 2.2684E-04 S14 9.7816E-02 -1.0521E-01 4.5534E-02 -2.1717E-02 8.4630E-03 -1.6832E-03 1.2525E-04 S15 -2.6002E-02 3.0499E-02 -2.6799E-03 -1.4915E-03 4.8708E-04 -5.8795E-05 2.7237E-06 S16 -1.1029E-01 4.0997E-02 -1.2366E-02 2.7327E-03 -4.1850E-04 3.8038E-05 -1.4776E-06

[0183] Table 20

[0184] Table 21 gives half of the diagonal length ImgH of the effective pixel area on the imaging surface S19 in Example 7, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S19 on the optical axis, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of each lens.

[0185] ImgH (mm) 3.08 f3 (mm) -6.66 TTL (mm) 4.47 f4 (mm) -19.76 HFOV (°) 43.2 f5 (mm) -226.61 Fno 1.80 f6 (mm) 6.12 f (mm) 3.25 f7 (mm) 3.94 f1 (mm) 182.29 f8 (mm) -2.23 f2 (mm) 2.85

[0186] Table 21

[0187] Figure 14A Shows the axial chromatic aberration curve of the imaging lens in Example 7, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 14B Shows the astigmatism curve of the imaging lens in Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14C Shows the distortion curve of the imaging lens in Example 7, which represents the distortion magnitude values under different image heights. Figure 14D Shows the lateral chromatic aberration curve of the imaging lens in Example 7, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 14A to 14D it can be known that the imaging lens given in Example 7 can achieve good imaging quality.

[0188] Example 8

[0189] The following refers to Figures 15 to 16D to describe the imaging lens according to Example 8 of the present application. Figure 15 Shows a schematic structural diagram of the imaging lens according to Example 8 of the present application.

[0190] As Figure 15 shown, the imaging lens according to the exemplary embodiment of the present application 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.

[0191] 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 positive focal power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative 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. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0192] Table 22 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the lenses of the imaging lens of Example 8, where the units of the radii of curvature and thicknesses are both millimeters (mm).

[0193]

[0194]

[0195] Table 22

[0196] As can be seen from Table 22, in Example 8, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 23 shows the higher-order term coefficients of the aspherical surfaces that can be used in Example 8, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0197] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.3733E-01 8.6163E-02 -1.7945E-01 3.3452E-01 -2.8026E-01 9.7446E-02 -2.7094E-03 S2 -2.6694E-01 2.2316E-01 -2.5754E-01 5.8627E-01 -8.2155E-01 6.4339E-01 -2.0782E-01 S3 -1.5778E-01 9.4925E-02 -1.5451E-01 4.0792E-01 -6.0042E-01 3.9594E-01 -1.0521E-01 S4 -2.1244E-01 3.3100E-01 -7.3211E-01 1.1760E+00 -1.2800E+00 7.9606E-01 -2.1450E-01 S5 -2.3644E-01 3.9191E-01 -5.4918E-01 6.6649E-01 -7.1840E-01 5.0812E-01 -1.4321E-01 S6 -7.7501E-02 7.1130E-02 2.1345E-01 -6.8256E-01 9.1201E-01 -6.1004E-01 1.7049E-01 S7 -1.3030E-01 -1.5208E-02 -8.2615E-02 4.1922E-01 -5.9432E-01 5.2076E-01 -1.9916E-01 S8 -5.9266E-02 -5.1098E-01 1.4190E+00 -2.1838E+00 1.9790E+00 -9.0519E-01 1.5439E-01 S9 -1.7860E-01 -3.0918E-01 1.4472E+00 -2.6267E+00 2.6116E+00 -1.3366E+00 2.7224E-01 S10 -2.2111E-01 1.9795E-01 -1.4474E-01 1.1536E-02 1.0603E-01 -7.8040E-02 1.6422E-02 S11 1.4645E-01 -1.7761E-01 6.0084E-02 1.1554E-01 -1.3125E-01 5.3589E-02 -8.1900E-03 S12 3.1439E-02 -1.1867E-01 2.4894E-01 -2.0366E-01 1.0253E-01 -2.9149E-02 3.4004E-03 S13 -8.5099E-02 -6.5507E-02 8.1851E-02 -6.6891E-02 2.5817E-02 -4.0870E-03 1.8742E-04 S14 9.6999E-02 -1.0480E-01 4.5593E-02 -2.1688E-02 8.3900E-03 -1.6583E-03 1.2276E-04 S15 -2.5867E-02 3.0374E-02 -2.5661E-03 -1.5512E-03 5.0322E-04 -6.0987E-05 2.8420E-06 S16 -1.1135E-01 4.2246E-02 -1.2995E-02 2.9055E-03 -4.4470E-04 4.0054E-05 -1.5381E-06

[0198] Table 23

[0199] Table 24 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Example 8, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.

[0200] ImgH (mm) 3.08 f3 (mm) -6.64 TTL (mm) 4.48 f4 (mm) -47.99 HFOV (°) 43.2 f5 (mm) -27.57 Fno 1.80 f6 (mm) 6.03 f (mm) 3.25 f7 (mm) 3.94 f1 (mm) 174.72 f8 (mm) -2.22 f2 (mm) 2.85

[0201] Table 24

[0202] Figure 16AThe axial chromatic aberration curve of the imaging lens of Embodiment 8 is shown, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 16B The astigmatism curve of the imaging lens of Embodiment 8 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16C The distortion curve of the imaging lens of Embodiment 8 is shown, which represents the distortion magnitude values under different image heights. Figure 16D The lateral chromatic aberration curve of the imaging lens of Embodiment 8 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 16A to 16D it can be known that the imaging lens given in Embodiment 8 can achieve good imaging quality.

[0203] Example 9

[0204] The following refers to Figures 17 to 18D an imaging lens according to Embodiment 9 of the present application is described. Figure 17 A schematic structural diagram of the imaging lens according to Embodiment 9 of the present application is shown.

[0205] As Figure 17 shown, the imaging lens according to an exemplary embodiment of the present application 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.

[0206] The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a convex surface. The third lens E3 has a negative optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a concave surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The eighth lens E8 has a negative optical power, its object side surface S15 is a concave surface, and its image side surface S16 is a concave surface. The filter E9 has an object side surface S17 and an image side 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.

[0207] Table 25 shows the surface types, curvature radii, thicknesses, materials, and conic coefficients of the lenses of the imaging lens of Embodiment 9, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0208]

[0209] Table 25

[0210] As can be seen from Table 25, in Embodiment 9, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces. Table 26 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 9, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0211]

[0212]

[0213] Table 26

[0214] Table 27 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Embodiment 9, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S19 on the optical axis, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of each lens.

[0215] ImgH (mm) 3.08 f3 (mm) -6.53 TTL (mm) 4.51 f4 (mm) -12.99 HFOV (°) 43.5 f5 (mm) 41.32 Fno 1.98 f6 (mm) 6.01 f (mm) 3.24 f7 (mm) 4.31 f1 (mm) 163.67 f8 (mm) -2.25 f2 (mm) 2.88

[0216] Table 27

[0217] Figure 18A Shows the axial chromatic aberration curve of the imaging lens in Embodiment 9, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 18B Shows the astigmatism curve of the imaging lens in Embodiment 9, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18C Shows the distortion curve of the imaging lens in Embodiment 9, which represents the distortion magnitude values under different image heights. Figure 18D Shows the lateral chromatic aberration curve of the imaging lens in Embodiment 9, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 18A to 18D it can be known that the imaging lens given in Embodiment 9 can achieve good imaging quality.

[0218] Example 10

[0219] The following refers to Figures 19 to 20D to describe the imaging lens according to Embodiment 10 of the present application. Figure 19 Shows a schematic structural diagram of the imaging lens according to Embodiment 10 of the present application.

[0220] As Figure 19As shown, the imaging lens according to an exemplary embodiment of the present application 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.

[0221] 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 convex. The third lens E3 has a negative optical power, its object surface S5 is convex, and its image surface S6 is concave. 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 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 convex. The eighth lens E8 has a negative optical power, its object surface S15 is concave, 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.

[0222] Table 28 shows the surface types, curvature radii, thicknesses, materials, and conic coefficients of the lenses of the imaging lens of Example 10, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0223]

[0224]

[0225] Table 28

[0226] As can be seen from Table 28, in Example 10, the object surfaces and image surfaces of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 29 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 10, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0227] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.4880E-01 1.0415E-01 -1.5740E-01 2.3496E-01 -1.1584E-01 -3.8369E-02 4.2027E-02 S2 -2.7252E-01 2.9711E-01 -4.2241E-01 8.4190E-01 -1.1272E+00 8.7422E-01 -2.9130E-01 S3 -1.5792E-01 1.3516E-01 -2.0259E-01 3.9460E-01 -5.6914E-01 4.3992E-01 -1.4903E-01 S4 -1.9172E-01 1.9802E-01 -2.9544E-01 4.2564E-01 -5.0843E-01 3.7631E-01 -1.2636E-01 S5 -2.0624E-01 2.3890E-01 -6.8234E-02 -2.2878E-01 3.3400E-01 -1.9683E-01 5.0930E-02 S6 -7.7777E-02 5.9295E-02 2.1755E-01 -6.2367E-01 7.8268E-01 -5.0540E-01 1.3756E-01 S7 -1.1641E-01 -8.1609E-02 2.3779E-01 -3.8817E-01 4.8115E-01 -2.4912E-01 3.2216E-02 S8 -8.9902E-02 -2.3764E-01 5.9236E-01 -7.9962E-01 6.5433E-01 -2.6124E-01 3.5465E-02 S9 -1.9018E-01 -1.5605E-01 6.5856E-01 -9.0482E-01 7.3570E-01 -3.3624E-01 6.4287E-02 S10 -1.8878E-01 3.3367E-02 9.6492E-02 -1.3517E-01 1.4194E-01 -8.2884E-02 1.8121E-02 S11 1.3905E-01 -1.2806E-01 -7.1993E-03 1.2639E-01 -1.0119E-01 3.3066E-02 -4.1327E-03 S12 4.6193E-03 -1.0635E-04 3.9444E-02 -2.2903E-02 1.3834E-02 -5.8191E-03 8.8455E-04 S13 -1.1134E-01 2.2803E-02 -3.5292E-02 3.0941E-02 -1.5423E-02 3.7874E-03 -3.4416E-04 S14 6.5885E-02 -5.1219E-02 1.7425E-02 -5.7340E-03 1.3522E-03 -1.6625E-04 6.1490E-06 S15 -4.0242E-02 5.8092E-02 -2.0824E-02 3.9622E-03 -3.8919E-04 1.5929E-05 -2.2528E-09 S16 -1.2145E-01 5.6441E-02 -2.1366E-02 5.1635E-03 -7.3576E-04 5.6707E-05 -1.8278E-06

[0228] Table 29

[0229] Table 30 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 in Example 10, the distance TTL from the object surface S1 of the first lens E1 to the imaging surface S19 on the optical axis, the maximum half field of view HFOV, the f-number Fno, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.

[0230]

[0231]

[0232] Table 30

[0233] Figure 20A shows the axial chromatic aberration curve of the imaging lens of Embodiment 10, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 20B shows the astigmatism curve of the imaging lens of Embodiment 10, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20C shows the distortion curve of the imaging lens of Embodiment 10, which represents the distortion magnitude values under different image heights. Figure 20D shows the lateral chromatic aberration curve of the imaging lens of Embodiment 10, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 20A to 20D it can be known that the imaging lens given in Embodiment 10 can achieve good imaging quality.

[0234] In summary, Embodiments 1 to 10 respectively satisfy the relationships shown in Table 31.

[0235] Conditional expression / Example 1 2 3 4 5 6 7 8 9 10 f / EPD 1.98 1.98 1.98 1.98 1.98 1.91 1.80 1.80 1.98 1.86 f2 / f 0.91 0.91 0.90 0.92 0.91 0.88 0.88 0.88 0.89 0.87 ImgH / f6 0.61 0.61 0.58 0.55 0.52 0.55 0.50 0.51 0.51 0.48 f123 / f4567 1.61 1.63 1.70 1.70 1.68 1.77 1.69 1.69 1.59 1.58 ∑CT / ∑AT 2.14 2.12 2.16 2.25 2.21 2.26 2.14 2.15 2.28 2.10 TTL / f7 0.82 0.84 0.93 1.02 0.99 1.13 1.13 1.14 1.05 1.06 |R6 / R5| 0.61 0.58 0.52 0.55 0.53 0.55 0.55 0.55 0.54 0.55 R15 / R11 0.49 0.51 0.57 0.66 0.77 0.62 0.71 0.70 0.68 0.74 (CT2 + CT1) / (CT2 - CT1) 2.63 2.73 2.58 2.52 2.38 2.21 2.41 2.37 2.29 2.14 T34 / T78 0.69 0.70 0.77 0.88 0.87 0.98 1.05 1.06 0.88 0.83

[0236] Table 31

[0237] This application also provides an imaging device, whose 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 imaging lens described above.

[0238] The above description is only the preferred embodiments of this application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions 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 solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in this application.

Claims

1. An imaging lens, sequentially from the object side to the image side along the optical axis comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens having optical powers, characterized in that the second lens, the sixth lens and the seventh lens all have positive optical powers; the third lens and the eighth lens both have negative optical powers; the object side surface of the first lens is convex and the image side surface is concave; the object side surface of the second lens is convex; the object side surface of the third lens is convex and the image side surface is concave; the object side surface of the fifth lens is convex and the image side surface is concave; the object side surface of the sixth lens is concave and the image side surface is convex; the object side surface of the seventh lens is convex; the object side surface of the eighth lens is concave and the image side surface is concave; the number of lenses with optical powers in the imaging lens is eight; the first lens has a positive optical power, and at least one of the fourth lens and the fifth lens has a negative optical power; or, the first lens has a negative optical power, the fourth lens has a negative optical power, and the fifth lens has a positive or negative optical power; and there is an air gap between any two adjacent lenses among the first lens to the eighth lens; the interval distance T34 between the third lens and the fourth lens on the optical axis and the interval distance T78 between the seventh lens and the eighth lens on the optical axis satisfy 0.69 ≤ T34 / T78 ≤ 1.06; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R15 of the object side surface of the eighth lens satisfy 0.49 ≤ R15 / R11 ≤ 0.

77.

2. The imaging lens according to claim 1, characterized in that the effective focal length f2 of the second lens and the total effective focal length f of the imaging lens satisfy 0.87 ≤ f2 / f ≤ 0.

92.

3. The imaging lens according to claim 1, characterized in that half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens and the effective focal length f6 of the sixth lens satisfy 0.48 ≤ ImgH / f6 ≤ 0.

61.

4. The imaging lens according to claim 1, characterized in that The radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy 0.52 ≤ R6 / R5 ≤ 0.

61.

5. The imaging lens according to claim 1, characterized in that the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy 2.14 ≤ (CT2 + CT1) / (CT2 - CT1) ≤ 2.

73.

6. The imaging lens according to claim 1, characterized in that the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy 1.58 ≤ f123 / f4567 ≤ 1.

77.

7. The imaging lens according to claim 1, characterized in that the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and the effective focal length f7 of the seventh lens satisfy 0.82 ≤ TTL / f7 ≤ 1.

14.

8. The imaging lens according to any one of claims 1 to 7, wherein, the sum ∑CT of the central thicknesses of the first lens to the eighth lens on the optical axis respectively and the sum ∑AT of the distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis satisfy 2.10 ≤ ∑CT / ∑AT ≤ 2.

28.

9. The imaging lens according to any one of claims 1 to 7, wherein, the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy 1.80 ≤ f / EPD ≤ 1.98.

Images