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 made of glass; a second lens; a third lens; a fourth lens with positive optical power; a fifth lens; a sixth lens with a convex object side and a concave image side; a seventh lens with a convex object side and a convex image side; an eighth lens; wherein, the number of lenses with optical power in the imaging lens is eight, and the imaging lens satisfies: TTL / ImgH < 1.2, and 7mm < tan(Semi-FOV)*f < 10mm; where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel region on the imaging surface, Semi-FOV is half of the maximum field of view angle of the imaging lens, and f is the total effective focal length of the imaging lens.

Description

Technical Field

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

[0002] With the rapid replacement of smartphones, tablets, and consumer electronic products related to artificial intelligence, the market's requirements for imaging lenses on the product side are becoming increasingly diverse. For example, in addition to requiring imaging lenses on the product side to have high pixels, high resolution, and a large field of view angle, etc., there are also requirements for miniaturization and thinning of the size of the imaging lens. However, how to balance the imaging quality and system size of the imaging lens has become an urgent problem to be solved currently.

[0003] It should be understood that this background art section is intended to partially provide useful background for understanding this technology. However, these contents are not necessarily what those skilled in the art knew or understood before the filing date of this application. Summary of the Invention

[0004] This application provides an imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens made of glass; a second lens; a third lens; a fourth lens with a positive optical power; a fifth lens; a sixth lens with a convex object side and a concave image side; a seventh lens with a convex object side and a convex image side; an eighth lens; wherein, the number of lenses with optical power in the imaging lens is eight, and the imaging lens satisfies: TTL / ImgH < 1.2, and 7mm < tan(Semi - FOV) * f < 10mm; where TTL is the distance from the object side of the first lens to the imaging plane along the optical axis, ImgH is half of the diagonal length of the effective pixel area on the imaging plane, Semi - FOV is half of the maximum field of view angle of the imaging lens, and f is the total effective focal length of the imaging lens.

[0005] In an embodiment of this application, the imaging lens satisfies: -2.5 < f2 / f1 < -1, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

[0006] In an embodiment of this application, the imaging lens satisfies: 0.2 < (R11 + R12) / f < 2, 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, and f is the total effective focal length of the imaging lens.

[0007] In an embodiment of this application, the imaging lens satisfies: 1.07 ≤ CT7 / CT1 < 2, where CT1 is the central thickness of the first lens on the optical axis and CT7 is the central thickness of the seventh lens on the optical axis.

[0008] In an embodiment of the present application, the imaging lens satisfies: 1.43 ≤ CT5 / CT8 < 3.5, where CT5 is the central thickness of the fifth lens on the optical axis, and CT8 is the central thickness of the eighth lens on the optical axis.

[0009] In an embodiment of the present application, the imaging lens satisfies: Semi-FOV > 45°.

[0010] In an embodiment of the present application, the imaging lens satisfies: 0.5 < f12345 / f123 < 1.5, where f12345 is the combined focal length of the first, second, third, fourth, and fifth lenses, and f123 is the combined focal length of the first, second, and third lenses.

[0011] In an embodiment of the present application, the imaging lens satisfies: 0.4 ≤ (CT5 - CT4) / T45 < 2.5, where CT5 is the central thickness of the fifth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the air gap between the fourth and fifth lenses along the optical axis.

[0012] In an embodiment of the present application, the imaging lens satisfies: the material of any one of the second to eighth lenses is plastic, and the refractive index of any lens with a plastic material is greater than 1.5.

[0013] In an embodiment of the present application, the imaging lens satisfies: Vg > 19.0, where Vg is the dispersion coefficient of the first lens.

[0014] In an embodiment of the present application, the imaging lens satisfies: Np - Ng < 0, where Np is the minimum value of the refractive indices of the respective lenses from the second to eighth lenses, and Ng is the refractive index of the first lens.

[0015] In an embodiment of the present application, the imaging lens satisfies: 20 < (Vamin + Vbmin) / 2 < 45, where Vamin is the minimum value of the dispersion coefficients of the respective lenses from the first to fourth lenses, and Vbmin is the minimum value of the dispersion coefficients of the respective lenses from the fifth to eighth lenses.

[0016] In an embodiment of the present application, the imaging lens satisfies: -3 < 1 / (R5 / R6 - R7 / R8) < 0, where R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens.

[0017] In an embodiment of the present application, the imaging lens satisfies: ET5 / CT5 < 1, where CT5 is the central thickness of the fifth lens on the optical axis, and ET5 is the edge thickness of the fifth lens at the maximum effective diameter.

[0018] In an embodiment of the present application, the imaging lens satisfies: 1.1 < ET8 / CT8 < 4.1, where CT8 is the central thickness of the eighth lens on the optical axis, and ET8 is the edge thickness of the eighth lens at the maximum effective diameter.

[0019] In an embodiment of the present application, the imaging lens satisfies: 2 < ET3 / ET4 + ET6 / ET5 < 4, where ET3 is the edge thickness of the third lens at the maximum effective diameter, ET4 is the edge thickness of the fourth lens at the maximum effective diameter, ET5 is the edge thickness of the fifth lens at the maximum effective diameter, and ET6 is the edge thickness of the sixth lens at the maximum effective diameter.

[0020] In an embodiment of the present application, the imaging lens satisfies: f / f4 > 0, where f is the total effective focal length of the imaging lens, and f4 is the effective focal length of the fourth lens.

[0021] The imaging lens of the present application employs multiple (e.g., eight) lenses. By reasonably setting the ratio of the distance along the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens to half of the diagonal length of the effective pixel region on the imaging surface, it is possible to achieve a large image surface while making the imaging lens have the characteristics of miniaturization. Additionally, by reasonably setting the ratio of the tangent value of half of the maximum field of view angle of the imaging lens to the total effective focal length of the imaging lens, the imaging lens has a relatively wide field of view and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present application will become more apparent. In the drawings:

[0023] Figure 1 A schematic structural diagram of the imaging lens according to Embodiment 1 of the present application is shown;

[0024] Figures 2A to 2DThe axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 1 of the present application are respectively shown;

[0025] Figure 3 The schematic structural diagram of the imaging lens according to Embodiment 2 of the present application is shown;

[0026] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 2 of the present application are respectively shown;

[0027] Figure 5 The schematic structural diagram of the imaging lens according to Embodiment 3 of the present application is shown;

[0028] Figures 6A to 6D The axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 3 of the present application are respectively shown;

[0029] Figure 7 The schematic structural diagram of the imaging lens according to Embodiment 4 of the present application is shown;

[0030] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 4 of the present application are respectively shown;

[0031] Figure 9 The schematic structural diagram of the imaging lens according to Embodiment 5 of the present application is shown;

[0032] Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 5 of the present application are respectively shown;

[0033] Figure 11 The schematic structural diagram of the imaging lens according to Embodiment 6 of the present application is shown; and

[0034] Figures 12A to 12D The axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and distortion curve of the imaging lens according to Embodiment 6 of the present application are respectively shown; Detailed Embodiments

[0035] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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.

[0036] 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, 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.

[0037] In the drawings, for the sake of clarity, the thickness, dimensions, and shapes of the lenses 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 illustrative purposes only and are not drawn to an exact scale.

[0038] 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.

[0039] It should also be understood that the terms "comprising", "including", "having", "containing" and / or "including", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after 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 the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0040] Unless otherwise defined, all terms used herein (including technical and scientific terms) 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.

[0041] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application 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.

[0042] The features, principles and other aspects of the present application are described in detail below.

[0043] The imaging lens according to an exemplary embodiment of the present application may include, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, each having a focal power.

[0044] In an exemplary embodiment, the first lens may have a positive focal power, its object side surface may be convex, and its image side surface may be concave; the second lens may have a negative focal power, its object side surface is convex, and its image side surface is concave; the third lens may have a positive focal power, its object side surface may be convex, and its image side surface may be concave; the fourth lens may have a positive focal power, its object side surface may be concave, and its image side surface may be convex; the fifth lens may have a negative focal power, its object side surface may be concave, and its image side surface may be convex or concave; alternatively, its object side surface is convex and its image side surface is concave; the sixth lens may have a negative focal power, its object side surface may be convex, and its image side surface may be concave; the seventh lens may have a positive focal power, its object side surface may be convex, and its image side surface may be convex; the eighth lens may have a negative focal power, its object side surface may be concave, and its image side surface may be concave. By reasonably distributing the surface types and focal powers of the respective lenses of the imaging lens, the imaging effect can be effectively improved. In addition, by reasonably controlling the surface types of the respective lenses, the path of light in the optical system can be further adjusted, effectively improving the resolution of the imaging lens and balancing the aberration of the imaging lens.

[0045] In an exemplary embodiment, the imaging lens satisfies: TTL / ImgH < 1.2, and 7mm < tan(Semi-FOV)*f < 10mm; where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel region on the imaging surface, Semi-FOV is half of the maximum field of view angle of the imaging lens, and f is the total effective focal length of the imaging lens. Further, the imaging lens satisfies: 1.0 < TTL / ImgH < 1.2, and 7.5mm < tan(Semi-FOV)*f < 9.0mm. By reasonably setting the ratio of the distance along the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens to half of the diagonal length of the effective pixel region on the imaging surface, the imaging lens can be miniaturized while achieving a large image surface; in addition, by reasonably setting the ratio between the tangent value of half of the maximum field of view angle of the imaging lens and the total effective focal length of the imaging lens, the imaging lens has a relatively wide field of view and high imaging quality.

[0046] In an exemplary embodiment, the imaging lens satisfies: -2.5 < f2 / f1 < -1, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. Further, the imaging lens satisfies: -1.8 < f2 / f1 < -1.0. By reasonably setting the ratio of the effective focal length of the first lens to the effective focal length of the second lens, it is beneficial to balance the aberration of the imaging lens and improve the resolution of the imaging lens.

[0047] In an exemplary embodiment, the imaging lens satisfies: 0.2 < (R11 + R12) / f < 2, 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, and f is the total effective focal length of the imaging lens. Further, the imaging lens satisfies: 0.8 < (R11 + R12) / f < 2. By reasonably setting the ratio of the sum of the curvature radius of the object side of the sixth lens and the curvature radius of the image side of the sixth lens to the total effective focal length of the imaging lens, it is beneficial to control the angle of off-axis field light incident on the imaging surface and improve the matching between the imaging lens and the photosensitive element and the color filter.

[0048] In an exemplary embodiment, the imaging lens satisfies: 1.07 ≤ CT7 / CT1 < 2, where CT1 is the central thickness of the first lens on the optical axis and CT7 is the central thickness of the seventh lens on the optical axis. Further, the imaging lens satisfies: 1.07 ≤ CT7 / CT1 < 1.5. By reasonably setting the ratio of the central thicknesses of the first lens and the seventh lens on the optical axis, the size of the imaging lens can be effectively reduced, avoiding the imaging lens from being too large in volume, while reducing the assembly difficulty of the lens and achieving a higher space utilization rate.

[0049] In an exemplary embodiment, the imaging lens satisfies: 1.43 ≤ CT5 / CT8 < 3.5, where CT5 is the central thickness of the fifth lens on the optical axis and CT8 is the central thickness of the eighth lens on the optical axis. Further, the imaging lens satisfies: 1.43 ≤ CT5 / CT8 < 2.5. By reasonably setting the ratio of the central thicknesses of the fifth lens and the eighth lens on the optical axis, the imaging lens can have good processability, and the imaging lens can obtain sufficient spacing space and higher surface freedom, while enhancing the ability of the imaging lens to correct field curvature and astigmatism.

[0050] In an exemplary embodiment, the imaging lens satisfies: Semi-FOV > 45°, where Semi-FOV is half of the maximum field of view angle of the imaging lens. Further, the imaging lens satisfies: 45° < Semi-FOV < 50°. When Semi-FOV > 45°, the imaging lens can have a broader imaging field of view.

[0051] In an exemplary embodiment, the imaging lens satisfies: 0.5 < f12345 / f123 < 1.5, where f12345 is the combined focal length of the first, second, third, fourth, and fifth lenses, and f123 is the combined focal length of the first, second, and third lenses. Further, the imaging lens satisfies: 0.7 < f12345 / f123 < 1.3. Satisfying 0.5 < f12345 / f123 < 1.5 can effectively reduce the optical sensitivity of the lens and is more conducive to mass production.

[0052] In an exemplary embodiment, the imaging lens satisfies: 0.4 ≤ (CT5 - CT4) / T45 < 2.5, where CT5 is the central thickness of the fifth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the air gap between the fourth and fifth lenses along the optical axis. Further, the imaging lens satisfies: 0.4 ≤ (CT5 - CT4) / T45 < 2.0. By reasonably controlling the ratio of the difference in the central thicknesses of the fourth and fifth lenses to the air gap between the fourth and fifth lenses on the optical axis within a certain range, it is possible to ensure that the lens has good processability and adjust the chief ray angle of the imaging lens, thereby effectively improving the relative brightness of the imaging lens and enhancing the image plane clarity.

[0053] In an exemplary embodiment, the imaging lens satisfies: the material of any one of the second to eighth lenses is plastic, and the refractive index of any lens with a plastic material is greater than 1.5. Satisfying the above conditions can balance the lens chromatic aberration and correct the lens aberration while controlling costs, thereby improving the imaging quality of the lens.

[0054] In an exemplary embodiment, the imaging lens satisfies: Vg > 19.0, where Vg is the dispersion coefficient of the first lens. Further, the imaging lens satisfies: 25.0 < Vg < 40.0. By restricting the dispersion coefficient of the first lens made of glass, the dispersion ability of the glass lens can be reasonably distributed, so that the chromatic aberration generated by the plastic lens is balanced with that of the glass lens, and the aberration of the lens is fully corrected, thereby improving the imaging quality.

[0055] In an exemplary embodiment, the imaging lens satisfies: Np - Ng < 0, where Np is the minimum value of the refractive indices of the lenses from the second to the eighth lenses, and Ng is the refractive index of the first lens. Further, the imaging lens satisfies: -1.5 < Np - Ng < 0. By restricting the difference between the minimum value of the refractive indices of the plastic lenses and the minimum value of the refractive indices of the glass lenses, the dispersion ability of the system is reasonably distributed, and the axial chromatic aberration and the lateral chromatic aberration are better corrected; at the same time, it is beneficial to the molding process of the plastic lenses and the glass lenses, thereby improving the production yield of the imaging lens.

[0056] In an exemplary embodiment, the imaging lens satisfies: 20 < (Vamin + Vbmin) / 2 < 45, where Vamin is the minimum value of the dispersion coefficients of the lenses from the first lens to the fourth lens, and Vbmin is the minimum value of the dispersion coefficients of the lenses from the fifth lens to the eighth lens. Further, the imaging lens satisfies: 25 < (Vamin + Vbmin) / 2 < 40. By constraining the sum of the minimum value of the dispersion coefficients of the first four lenses of the imaging lens and the minimum value of the dispersion coefficients of the last four lenses within a reasonable range, the size layout of the imaging lens can be made more reasonable, which is beneficial to the processability of the lens and the stability of its use; at the same time, it can better correct the system chromatic aberration to improve the imaging quality.

[0057] In an exemplary embodiment, the imaging lens satisfies: -3 < 1 / (R5 / R6 - R7 / R8) < 0, where R5 is the curvature radius of the object side of the third lens, R6 is the curvature radius of the image side of the third lens, R7 is the curvature radius of the object side of the fourth lens, and R8 is the curvature radius of the image side of the fourth lens. Further, the imaging lens satisfies: -2.0 < 1 / (R5 / R6 - R7 / R8) < -0.3. Satisfying -3 < 1 / (R5 / R6 - R7 / R8) < 0 is beneficial for the imaging lens to better adjust the light focusing position, improve the light converging ability of the lens, and effectively balance the axial aberration of the imaging lens.

[0058] In an exemplary embodiment, the imaging lens satisfies: ET5 / CT5 < 1, where CT5 is the central thickness of the fifth lens on the optical axis, and ET5 is the edge thickness at the maximum effective diameter of the fifth lens. Further, the imaging lens satisfies: 0.2 < ET5 / CT5 < 0.8. By reasonably controlling the ratio of the edge thickness at the maximum effective diameter of the fifth lens to its central thickness on the optical axis, the processing and assembly difficulty of the lens can be reduced.

[0059] In an exemplary embodiment, the imaging lens satisfies: 1.1 < ET8 / CT8 < 4.1, where CT8 is the central thickness of the eighth lens on the optical axis, and ET8 is the edge thickness at the maximum effective diameter of the eighth lens. Further, the imaging lens satisfies: 1.2 < ET8 / CT8 < 3.8. By reasonably controlling the ratio of the edge thickness at the maximum effective diameter of the eighth lens to its central thickness on the optical axis, it is possible to avoid the excessive thickness or thinness of the imaging lens, reduce the molding difficulty of the lens, and achieve a high space utilization rate.

[0060] In an exemplary embodiment, the imaging lens satisfies: 2 < ET3 / ET4 + ET6 / ET5 < 4, where ET3 is the edge thickness at the maximum effective diameter of the third lens, ET4 is the edge thickness at the maximum effective diameter of the fourth lens, ET5 is the edge thickness at the maximum effective diameter of the fifth lens, and ET6 is the edge thickness at the maximum effective diameter of the sixth lens. Further, the imaging lens satisfies: 2.5 < ET3 / ET4 + ET6 / ET5 < 3.5. Satisfying 2 < ET3 / ET4 + ET6 / ET5 < 4 can ensure the processing and assembly characteristics of the imaging lens, and avoid problems such as interference and matching of the front and rear lenses during the assembly process due to too small or too large edge thickness. At the same time, it is beneficial to slow down the light deflection, adjust the field curvature of the imaging lens, reduce the sensitivity, and thus improve the imaging quality.

[0061] In an exemplary embodiment, the imaging lens satisfies: f / f4 > 0, where f is the total effective focal length of the imaging lens and f4 is the effective focal length of the fourth lens. Further, the imaging lens satisfies: 0 < f / f4 < 0.6. By reasonably controlling the ratio of the total effective focal length of the lens to the effective focal length of the fourth lens, it is beneficial to correct aberrations and adjust the light position, and shorten the total length of the imaging lens.

[0062] In an exemplary embodiment, the material of the first lens can be glass, and the material of any one of the second lens to the eighth lens can be plastic. Selecting glass material for the first lens enables the first lens to have a high Abbe number and a high refractive index, which can reduce the size of the imaging lens; the materials of the second lens to the eighth lens are plastic, which is beneficial to saving the cost of the imaging lens and reducing the processing difficulty of the lens while obtaining high imaging quality.

[0063] In an exemplary embodiment, the imaging lens according to the present application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0064] In an embodiment of the present application, at least one of the mirror surfaces of each of the first lens to the eighth lens is an aspherical mirror 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, and thus improve the imaging quality. Optionally, the object side and the image side of each of the first lens to the eighth lens are aspherical mirror surfaces.

[0065] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the 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 embodiments, the imaging lens is not limited to including eight lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0066] Specific embodiments of the imaging lens applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0067] Example 1

[0068] The following refers to Figures 1 to 2D Describe the imaging lens according to Embodiment 1 of the present application. As Figure 1 shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: 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.

[0069] The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power, its object surface S7 is concave, and its image surface S8 is convex. The fifth lens E5 has a negative optical power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is convex, and its image surface S12 is concave. 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.

[0070] Table 1 shows the basic parameter table of the imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0071]

[0072] Table 1

[0073] In this embodiment, the total effective focal length f of the imaging lens is 7.55 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S19 along the optical axis is 8.93 mm, half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi-FOV = 47.4°, and the aperture value FNO of the imaging lens is 1.90.

[0074] In this embodiment, the surface shape x of the aspherical surfaces included in the object side surface and the image side surface of the lenses from the first lens E1 to the eighth lens E8 can be defined by, but not limited to, the following aspherical formula:

[0075]

[0076] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for each of the aspherical surfaces S1 to S16 in the imaging lens of Example 1.

[0077] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -2.7638E-02 -7.2894E-03 -1.1627E-03 -1.7892E-04 -4.1516E-05 -6.7609E-05 -6.1814E-05 S2 -5.5595E-03 8.3016E-04 -1.1904E-03 -3.5275E-04 -1.6365E-04 -2.6178E-04 -1.5773E-04 S3 -2.5350E-02 2.3116E-03 -2.1128E-03 -1.6063E-04 3.2136E-04 -4.1168E-04 2.0212E-05 S4 -9.9440E-03 1.8109E-03 -3.8355E-03 -3.4714E-04 2.5818E-04 -4.2123E-05 -1.1604E-05 S5 9.1281E-02 1.9609E-02 1.6419E-03 -5.9336E-04 1.8980E-04 1.7913E-06 7.2064E-06 S6 5.3268E-02 1.8719E-02 5.0375E-03 5.7195E-04 2.1899E-04 -2.7774E-05 1.9180E-05 S7 -1.4654E-01 -2.1758E-03 1.6557E-03 1.2740E-04 4.0828E-05 -6.3824E-05 1.2891E-04 S8 -2.0047E-01 6.4549E-03 8.3493E-03 3.5730E-04 1.3546E-03 -4.5768E-04 4.5788E-04 S9 -2.3452E-01 1.5450E-03 1.0812E-02 1.5712E-03 6.7585E-04 -6.8425E-04 6.9640E-04 S10 -4.3551E-01 1.3334E-02 1.8312E-02 9.0010E-03 -3.3114E-05 -1.0139E-03 -2.1293E-04 S11 -1.8202E+00 8.7909E-02 -2.0111E-02 2.8086E-02 -7.1196E-04 2.5579E-03 -1.1701E-03 S12 -2.9602E+00 4.5412E-01 -1.2528E-01 1.0836E-02 -6.1656E-03 7.7314E-03 -5.1119E-03 S13 -4.3192E+00 4.8917E-01 -6.0681E-02 -7.4136E-02 1.0252E-02 5.8521E-04 -1.0674E-02 S14 -3.6887E-01 -2.0212E-01 1.4283E-01 -5.8996E-02 1.9728E-02 -1.8590E-03 -2.8340E-03 S15 2.9163E-01 8.5665E-01 -4.7944E-01 2.1827E-01 -7.3362E-02 1.6263E-02 4.4544E-04 S16 -5.7857E+00 1.1230E+00 -3.2833E-01 1.4110E-01 -6.0095E-02 3.4816E-02 -2.0919E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -4.6913E-05 -1.0739E-05 -2.0578E-05 5.1332E-06 1.7915E-06 6.1884E-06 7.8333E-06 S2 2.0777E-04 -8.1595E-05 1.2402E-04 -1.5572E-05 6.7725E-05 -2.7547E-05 2.1185E-05 S3 1.6554E-04 -8.5058E-05 9.2932E-05 -2.7407E-05 4.4528E-05 -2.1313E-05 1.4850E-05 S4 8.0250E-05 -6.9940E-05 4.1727E-05 -1.6988E-05 2.9606E-05 -1.6710E-05 9.6369E-06 S5 3.3299E-06 4.1867E-06 -1.7723E-05 5.2491E-06 -4.2111E-06 9.9989E-06 -1.9233E-06 S6 -3.9938E-05 8.7497E-06 -1.5929E-05 1.3211E-05 -1.1825E-06 8.7215E-06 -8.1242E-06 S7 -5.1446E-05 3.5229E-05 -2.3150E-05 -3.4978E-07 -9.3286E-06 4.0116E-06 1.9777E-06 S8 -4.6491E-04 6.6227E-06 -2.5287E-04 -4.0339E-05 -1.1225E-04 5.3317E-06 -2.7964E-05 S9 -1.4800E-04 8.0181E-05 -2.1148E-04 -7.8112E-05 -7.6276E-05 1.1244E-05 7.0068E-06 S10 2.7537E-04 2.8049E-04 1.8083E-04 4.0899E-05 4.2474E-06 -1.6112E-05 -1.2097E-05 S11 7.1589E-04 8.4912E-05 2.8472E-04 -1.3066E-04 -4.5054E-06 -3.0407E-06 2.3580E-05 S12 1.4611E-03 -1.2713E-04 1.9169E-04 -4.9599E-04 1.2524E-04 -1.1251E-04 -4.6722E-05 S13 7.4835E-03 -2.7900E-03 -4.1968E-04 2.4278E-04 1.7249E-04 -3.3317E-04 9.7869E-05 S14 4.9369E-03 -4.4408E-03 1.8621E-03 -1.1996E-04 -7.2786E-05 1.0244E-04 -3.4969E-05 S15 4.8614E-03 -1.2762E-02 1.1501E-02 -6.2673E-03 1.1855E-03 1.2157E-04 -3.1492E-04 S16 1.7728E-02 -1.3760E-02 6.7669E-03 -2.3893E-03 1.6594E-03 -7.0120E-04 5.5512E-04

[0078] Table 2

[0079] Figure 2A shows the axial chromatic aberration curve of the imaging lens of Example 1, which represents the deviation of the convergence focal points of light rays with different wavelengths after passing through the imaging lens. Figure 2B shows the astigmatism curve of the imaging lens of Example 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C shows the lateral chromatic aberration curve of the imaging lens of Example 1, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. Figure 2D shows the distortion curve of the imaging lens of Example 1, which represents the distortion magnitude values corresponding to different image heights. According to Figures 2A to 2D it can be seen that the imaging lens given in Example 1 can achieve good imaging quality.

[0080] Example 2

[0081] The following refers to Figures 3 to 4D to describe the imaging lens according to Embodiment 2 of the present application. As Figure 3As shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0082] The first lens E1 has a positive focal power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative 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 concave. The fourth lens E4 has a positive focal power, its object surface S7 is concave, and its image surface S8 is convex. 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 negative focal power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a positive focal power, its object surface S13 is convex, and its image surface S14 is convex. 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.

[0083] Table 3 shows the basic parameter table of the imaging lens of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0084]

[0085] Table 3

[0086] In this embodiment, the total effective focal length f of the imaging lens is 7.65 mm, the distance TTL from the object surface S1 of the first lens E1 to the imaging surface S19 along the optical axis is 8.92 mm, half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi-FOV = 47.0°, and the aperture value FNO of the imaging lens is 1.90.

[0087] Table 4 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each mirror surface of the aspherical surfaces S1 to S16 in Example 2. Among them, the aspherical surface profiles can be defined by the formula (1) given in the above Example 1.

[0088] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -2.6120E-02 -8.4780E-03 -2.5702E-03 -6.5826E-04 -2.1246E-04 -1.5419E-06 1.2965E-05 S2 -7.9276E-03 7.7957E-05 7.1474E-04 2.0173E-04 4.3935E-04 2.8041E-04 9.4069E-05 S3 -2.8107E-02 5.8603E-03 1.1622E-03 1.0094E-03 6.6377E-04 2.7565E-04 7.9042E-05 S4 -9.7268E-03 7.2245E-04 -3.0976E-03 -4.3950E-04 3.1169E-05 1.2475E-04 2.8044E-05 S5 9.6636E-02 2.3742E-02 3.1725E-03 6.9991E-05 -1.7459E-05 3.0056E-05 3.7866E-05 S6 5.4050E-02 2.0742E-02 6.1567E-03 1.3783E-03 3.2360E-04 1.1719E-05 2.3106E-05 S7 -1.6802E-01 -7.3338E-03 1.0546E-03 1.6569E-04 1.7920E-04 -1.8383E-05 2.9915E-05 S8 -1.8933E-01 6.8501E-03 7.4057E-03 1.1301E-03 7.8730E-04 9.9229E-05 2.1274E-04 S9 -2.9058E-01 1.4480E-02 1.6460E-02 7.2287E-04 -1.3459E-03 -6.9006E-04 5.5720E-04 S10 -5.0952E-01 2.6605E-02 2.8249E-02 9.4965E-03 -2.5052E-03 -2.4593E-03 -7.5425E-04 S11 -1.7809E+00 9.8062E-02 -2.6920E-02 2.8923E-02 -7.7448E-04 3.3046E-03 -2.5225E-03 S12 -2.9869E+00 4.5611E-01 -1.2270E-01 1.4317E-02 -8.8062E-03 8.3808E-03 -5.7916E-03 S13 -4.4703E+00 5.0461E-01 -8.8744E-02 -8.7427E-02 7.2852E-03 -2.4661E-03 -1.1951E-02 S14 -1.9920E-01 -2.4043E-01 1.5746E-01 -6.8346E-02 2.5932E-02 -8.5439E-03 -5.8277E-03 S15 2.4885E-01 8.5057E-01 -4.7434E-01 2.0981E-01 -7.3425E-02 1.6913E-02 -4.4116E-03 S16 -7.3485E+00 7.5551E-01 -4.9633E-01 1.1042E-01 -1.1480E-01 1.2856E-02 -4.2698E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 2.1786E-05 1.6151E-06 2.9440E-06 -2.4619E-06 3.2810E-06 -1.9785E-07 1.5339E-06 S2 3.4475E-05 1.5255E-05 1.1620E-05 -2.7367E-06 -2.5406E-06 -4.0347E-06 3.4436E-06 S3 2.0158E-05 2.2204E-05 3.7888E-07 -2.2938E-06 -3.9051E-06 -1.6189E-06 -2.7159E-06 S4 2.5527E-06 -7.3865E-06 -1.8977E-06 -3.1189E-06 3.3621E-06 2.6709E-06 3.0841E-06 S5 -4.2042E-06 -3.3864E-06 -9.7165E-06 9.2640E-07 1.3311E-06 4.5337E-06 -1.4535E-06 S6 -1.2027E-05 7.6332E-06 -5.8277E-06 2.5744E-06 -5.8464E-07 3.7599E-06 -3.0890E-06 S7 1.6317E-05 1.5363E-05 1.0974E-05 -2.8750E-07 1.3288E-07 -1.8114E-06 1.7631E-06 S8 9.1424E-05 7.6992E-05 2.2980E-05 9.8752E-06 -3.8794E-06 1.1949E-06 -6.0078E-07 S9 7.7773E-04 3.3742E-04 3.0015E-05 -1.0246E-04 -8.6038E-05 -3.9221E-05 -1.7836E-05 S10 9.8557E-04 8.7956E-04 4.1432E-04 -2.0612E-05 -1.5803E-04 -1.1028E-04 -4.6301E-05 S11 1.0855E-04 1.0343E-03 8.9239E-04 1.4196E-04 -2.5039E-04 -1.5715E-04 -1.2917E-04 S12 2.3736E-03 9.8522E-04 -1.9787E-04 -5.9123E-04 2.1033E-04 1.6634E-04 -1.1576E-04 S13 6.3542E-03 -4.4368E-03 -8.6508E-04 3.8420E-04 8.2906E-06 -2.2663E-04 -1.1342E-04 S14 -6.8126E-05 -5.3958E-03 1.4898E-03 -2.2840E-03 -1.1577E-03 -1.0245E-04 -5.6723E-04 S15 8.2676E-03 -1.4543E-02 1.2740E-02 -5.4491E-03 1.3586E-03 5.4787E-04 -1.5541E-04 S16 1.0755E-02 -2.1557E-02 4.3317E-03 -5.7511E-03 4.7524E-04 -1.9715E-03 2.2730E-04

[0089] Table 4

[0090] Figure 4AShows the axial chromatic aberration curve of the imaging lens of Embodiment 2, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the imaging lens. Figure 4B Shows the astigmatism curve of the imaging lens of Embodiment 2, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 4C Shows the lateral chromatic aberration curve of the imaging lens of Embodiment 2, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. Figure 4D Shows the distortion curve of the imaging lens of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. According to Figures 4A to 4D It can be seen that the imaging lens given in Embodiment 2 can achieve good imaging quality.

[0091] Example 3

[0092] The following refers to Figures 5 to 6D Describe the imaging lens according to Embodiment 3 of the present application. As Figure 5 Shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: 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 plane S19.

[0093] 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 negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive 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 concave, and its image side surface S8 is convex. 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 negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a positive optical power, its object side surface S13 is convex, and its image side surface S14 is convex. 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 plane S19.

[0094] Table 5 shows the basic parameter table of the imaging lens of Embodiment 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0095]

[0096] Table 5

[0097] In this embodiment, the total effective focal length f of the imaging lens is 7.63 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S19 along the optical axis is 8.90 mm, half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi - FOV = 47.1°, and the aperture value FNO of the imaging lens is 1.90.

[0098] Table 6 shows the high - order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each mirror surface in the aspherical surfaces S1 to S16 in Embodiment 3. Among them, the aspherical surface profiles can be defined by the formula (1) given in Embodiment 1 above.

[0099] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -2.6222E-02 -8.7013E-03 -2.8755E-03 -7.6502E-04 -2.2920E-04 -5.3802E-06 -2.2647E-06 S2 -7.7558E-03 1.9038E-04 6.6120E-04 2.7035E-04 4.8469E-04 2.6210E-04 9.4260E-05 S3 -2.8255E-02 5.9758E-03 1.3403E-03 1.0018E-03 6.2599E-04 2.2554E-04 7.7416E-05 S4 -9.9965E-03 4.8933E-04 -3.0777E-03 -5.1181E-04 2.7145E-06 9.2901E-05 2.0526E-05 S5 9.6455E-02 2.4081E-02 3.2039E-03 -8.0932E-06 -3.5231E-06 8.4677E-07 2.5483E-05 S6 5.3591E-02 2.0685E-02 6.3186E-03 1.2550E-03 3.5148E-04 -3.2695E-05 2.5993E-05 S7 -1.6839E-01 -7.2593E-03 9.9887E-04 1.6275E-04 1.3397E-04 -4.7021E-05 1.8950E-05 S8 -1.9040E-01 6.8893E-03 7.6770E-03 1.2883E-03 7.7701E-04 1.4671E-04 2.2788E-04 S9 -2.8429E-01 1.2283E-02 1.5666E-02 7.4578E-04 -1.4713E-03 -8.5661E-04 3.6597E-04 S10 -4.9895E-01 2.2093E-02 2.5612E-02 9.4502E-03 -1.7933E-03 -2.3861E-03 -1.0727E-03 S11 -1.7535E+00 9.4889E-02 -2.7999E-02 2.7332E-02 -9.3611E-04 3.0552E-03 -2.6572E-03 S12 -2.9652E+00 4.5243E-01 -1.2117E-01 1.4435E-02 -8.7740E-03 8.5323E-03 -5.8786E-03 S13 -4.4487E+00 5.0350E-01 -8.3979E-02 -8.6270E-02 7.6714E-03 -1.7417E-03 -1.1646E-02 S14 -2.0683E-01 -2.3826E-01 1.5616E-01 -6.6388E-02 2.6735E-02 -6.9311E-03 -4.6889E-03 S15 2.2924E-01 8.4872E-01 -4.7097E-01 2.0731E-01 -7.1778E-02 1.6626E-02 -4.7245E-03 S16 -7.0926E+00 7.7756E-01 -4.5544E-01 1.3148E-01 -9.5849E-02 2.1522E-02 -3.4073E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 1.0222E-05 4.9985E-06 1.2406E-05 1.6496E-07 -1.5671E-06 -1.0862E-07 7.5419E-06 S2 5.3339E-05 4.0781E-05 7.3856E-06 -1.7855E-05 -5.7312E-06 -1.0111E-05 4.2023E-06 S3 4.9111E-05 4.6357E-05 -1.0259E-05 -1.5574E-05 -1.3737E-06 -1.1090E-05 -2.1323E-06 S4 1.9498E-05 1.0512E-05 -4.0443E-06 -1.0309E-05 3.9523E-06 -2.1018E-06 4.6194E-06 S5 -5.5508E-06 1.2190E-05 -3.5539E-06 1.7889E-06 2.5453E-07 7.8112E-07 -7.4109E-07 S6 -3.5111E-05 2.3014E-05 -6.0640E-06 8.3577E-06 -1.1817E-05 4.8412E-06 -3.1436E-06 S7 1.8453E-05 1.4370E-05 1.0385E-05 -4.6350E-07 -1.0498E-06 -2.7671E-06 9.6156E-07 S8 1.4667E-04 8.2345E-05 4.4831E-05 7.3443E-06 3.7889E-06 -4.7794E-06 1.5963E-06 S9 7.1062E-04 2.7981E-04 8.0368E-05 -6.3334E-05 -2.9586E-05 -2.8992E-05 -1.2464E-05 S10 5.2401E-04 5.9167E-04 3.4273E-04 3.8760E-05 -6.5122E-05 -4.9835E-05 -2.3497E-05 S11 -1.7985E-04 8.1398E-04 8.2495E-04 2.4123E-04 -1.4479E-04 -1.1991E-04 -1.2952E-04 S12 2.3359E-03 9.8060E-04 -8.1956E-05 -5.7698E-04 1.6667E-04 1.1643E-04 -9.3122E-05 S13 6.2764E-03 -3.9905E-03 -8.2375E-04 3.1220E-04 4.7504E-05 -2.5109E-04 -9.0527E-05 S14 8.9668E-04 -4.7350E-03 1.7252E-03 -1.8260E-03 -7.1440E-04 -9.4957E-05 -4.0418E-04 S15 8.5631E-03 -1.4600E-02 1.2586E-02 -4.9126E-03 1.1175E-03 6.2229E-04 -2.1193E-04 S16 1.5242E-02 -1.6149E-02 4.6334E-03 -4.5476E-03 7.9599E-04 -1.0598E-03 3.6743E-04

[0100] Table 6

[0101] Figure 6A shows the axial chromatic aberration curve of the imaging lens in Embodiment 3, which represents the deviation of the convergence focal points of light rays with different wavelengths after passing through the imaging lens. Figure 6B shows the astigmatism curve of the imaging lens in Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C shows the lateral chromatic aberration curve of the imaging lens in Embodiment 3, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. Figure 6D shows the distortion curve of the imaging lens in Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. According to Figures 6A to 6D it can be known that the imaging lens given in Embodiment 3 can achieve good imaging quality.

[0102] Example 4

[0103] The following refers to Figures 7 to 8D Describe the imaging lens according to Embodiment 4 of the present application. As Figure 7 shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: 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.

[0104] The first lens E1 has a positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has a negative optical power, with its object side S9 being concave and its image side S10 being convex. The sixth lens E6 has a negative optical power, with its object side S11 being convex and its image side S12 being concave. The seventh lens E7 has a positive optical power, with its object side S13 being convex and its image side S14 being convex. The eighth lens E8 has a negative optical 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.

[0105] Table 7 shows the basic parameter table of the imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0106]

[0107] Table 7

[0108] In this embodiment, the total effective focal length f of the imaging lens is 7.51 mm, the distance TTL along the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 is 8.93 mm, half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi-FOV = 47.6°, and the aperture value FNO of the imaging lens is 1.90.

[0109] Table 8 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for each mirror surface of the aspherical surfaces S1 to S16 in Embodiment 4, where the aspherical surface profiles can be defined by the formula (1) given in the above Embodiment 1.

[0110] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -3.2208E-02 -8.7889E-03 -2.5412E-03 -9.4938E-04 -4.1958E-04 -8.1973E-05 1.6326E-05 S2 -6.3179E-03 -3.2225E-04 -1.6431E-03 -5.9968E-04 9.3139E-05 -1.5726E-05 2.0303E-05 S3 -2.8076E-02 2.8571E-03 -1.5704E-03 2.2510E-04 2.8554E-04 -2.6943E-05 8.1320E-05 S4 -8.8340E-03 1.0185E-03 -3.3958E-03 -3.1372E-04 1.2564E-04 1.7578E-04 9.8217E-05 S5 9.1130E-02 1.9931E-02 2.2918E-03 -6.2552E-04 -2.0618E-05 -3.0912E-06 9.6284E-05 S6 4.7693E-02 1.8300E-02 5.0142E-03 6.8982E-04 1.9698E-04 -6.4741E-06 7.0527E-05 S7 -1.4643E-01 -3.7558E-03 1.5672E-03 -9.7995E-07 2.0438E-04 -9.1420E-05 4.3403E-05 S8 -1.9345E-01 7.0491E-03 7.9741E-03 9.7635E-04 1.4647E-03 1.7370E-04 5.1245E-04 S9 -2.3802E-01 4.3280E-03 1.2691E-02 2.2106E-03 4.1277E-04 -4.2703E-04 5.2611E-04 S10 -4.5702E-01 1.3071E-02 2.0807E-02 9.7592E-03 -3.1921E-04 -1.7978E-03 -1.1051E-03 S11 -1.7717E+00 8.9089E-02 -2.5495E-02 2.8507E-02 1.3713E-04 3.4091E-03 -1.8552E-03 S12 -3.0014E+00 4.5985E-01 -1.2621E-01 1.2244E-02 -6.5114E-03 8.7200E-03 -5.1434E-03 S13 -3.7817E+00 8.3831E-01 -5.7434E-02 -7.2591E-02 3.3219E-02 -2.1049E-03 -6.7955E-03 S14 2.0420E-01 -2.9981E-01 1.9116E-01 -8.2744E-02 3.6357E-02 -1.2297E-02 1.3425E-03 S15 5.2662E-01 9.0993E-01 -4.9651E-01 2.4307E-01 -9.1207E-02 2.5095E-02 -2.2678E-03 S16 -6.8131E+00 9.8580E-01 -3.7800E-01 1.6001E-01 -9.5582E-02 2.7490E-02 -2.2949E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 5.5694E-05 5.4420E-05 5.2255E-05 3.9553E-05 2.6282E-05 1.2145E-05 6.3757E-06 S2 -1.2912E-05 -3.4832E-05 -1.9521E-05 -3.7556E-05 -5.6345E-06 -1.4901E-05 3.1450E-06 S3 -1.3410E-06 4.4846E-06 -3.2532E-06 -1.2300E-05 4.7663E-06 -2.3413E-06 1.4650E-06 S4 1.8578E-05 -8.7581E-06 1.5840E-05 5.5231E-06 1.3184E-05 -8.6917E-06 1.1743E-06 S5 -1.4474E-05 1.3304E-05 -1.5273E-05 1.2941E-05 -1.7349E-06 9.6452E-06 -6.5353E-06 S6 1.2511E-05 3.1257E-05 -2.8023E-06 1.5290E-05 -6.7225E-07 7.3925E-06 -8.0231E-06 S7 -2.5214E-05 2.5968E-05 -5.3315E-06 1.1008E-05 -7.1904E-06 9.5122E-06 -3.4715E-06 S8 1.8809E-04 2.0575E-04 3.8528E-05 3.6654E-05 -1.9400E-05 1.1032E-05 -7.0270E-06 S9 6.7569E-04 3.0155E-04 5.0235E-05 -9.2614E-05 -6.1711E-05 -3.2007E-05 2.2173E-06 S10 2.5346E-04 4.1466E-04 3.0024E-04 4.8063E-05 -5.0459E-05 -6.0489E-05 -3.1077E-05 S11 -3.6031E-05 5.6382E-04 5.1717E-04 -7.4342E-08 -2.2360E-04 -1.0621E-04 -9.9890E-05 S12 1.6748E-03 7.6475E-04 -2.0927E-04 -5.6760E-04 1.5962E-04 7.5330E-05 -1.6089E-04 S13 8.3989E-03 -5.0972E-03 4.6162E-04 9.7924E-04 -2.5393E-04 -3.2179E-04 2.5665E-04 S14 2.4170E-03 -3.3717E-03 2.9017E-03 -8.0070E-04 8.2867E-05 1.0944E-04 -3.6299E-04 S15 1.2853E-03 -8.3262E-03 1.0799E-02 -5.9076E-03 2.4127E-03 -3.3270E-04 -4.2335E-04 S16 1.3814E-02 -1.1560E-02 6.3172E-03 -3.6920E-03 1.6994E-03 -8.4833E-04 6.5596E-04

[0111] Table 8

[0112] Figure 8A Shows the axial chromatic aberration curve of the imaging lens of Embodiment 4, which represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the imaging lens. Figure 8B Shows the astigmatism curve of the imaging lens of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8CThe longitudinal chromatic aberration curve of the imaging lens according to Embodiment 4 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. Figure 8D The distortion curve of the imaging lens according to Embodiment 4 is shown, which represents the distortion magnitude values corresponding to different image heights. According to Figures 8A to 8D it can be known that the imaging lens given in Embodiment 4 can achieve good imaging quality.

[0113] Example 5

[0114] The following refers to Figures 9 to 10D the imaging lens according to Embodiment 5 of the present application will be described. As Figure 9 shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0115] 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 negative optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface. The third lens E3 has a positive 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 positive optical power, its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fifth lens E5 has a negative optical power, its object side surface S9 is a concave surface, and its image side surface S10 is a concave surface. The sixth lens E6 has a negative optical power, its object side surface S11 is a convex surface, and its image side surface S12 is a concave 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. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0116] Table 9 shows the basic parameter table of the imaging lens according to Embodiment 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0117]

[0118]

[0119] Table 9

[0120] In this embodiment, the total effective focal length f of the imaging lens is 7.49 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S19 along the optical axis is 8.93 mm, half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi - FOV = 47.7°, and the aperture value FNO of the imaging lens is 1.90.

[0121] Table 10 shows the high - order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each mirror surface in the aspherical surfaces S1 to S16 in Example 5. Among them, each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0122]

[0123] Table 10

[0124] Figure 10A shows the axial chromatic aberration curve of the imaging lens in Example 5, which represents the deviation of the convergence focal points of light rays with different wavelengths after passing through the imaging 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 lateral chromatic aberration curve of the imaging lens in Example 5, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. Figure 10D shows the distortion curve of the imaging lens in Example 5, which represents the distortion magnitude values corresponding to different image heights. According to Figures 10A to 10D it can be seen that the imaging lens given in Example 5 can achieve good imaging quality.

[0125] Example 6

[0126] The following refers to Figures 11 to 12D Describe the imaging lens according to Embodiment 6 of the present application. As Figure 11 shown, the imaging lens sequentially includes, from the object side to the image side along the optical axis: 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.

[0127] The first lens E1 has a positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has a negative optical power, with its object side S9 being concave and its image side S10 being concave. The sixth lens E6 has a negative optical power, with its object side S11 being convex and its image side S12 being concave. The seventh lens E7 has a positive optical power, with its object side S13 being convex and its image side S14 being convex. The eighth lens E8 has a negative optical 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.

[0128] Table 11 shows the basic parameter table of the imaging lens of Example 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 11

[0132] In this embodiment, the total effective focal length f of the imaging lens is 7.45 mm, the distance TTL along the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 is 8.93 mm, half of the diagonal length of the effective pixel region on the imaging surface S19 is ImgH = 8.42 mm, half of the maximum field of view angle of the imaging lens is Semi - FOV = 47.8°, and the aperture value FNO of the imaging lens is 1.90.

[0133] Table 12 shows the high - order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each mirror surface of the aspherical surfaces S1 to S16 in Example 6, where the aspherical surface profiles can be defined by the formula (1) given in the above Example 1.

[0134]

[0135]

[0136] Table 12

[0137] Figure 12A shows the axial chromatic aberration curve of the imaging lens of Example 6, which represents the deviation of the convergence focal points of light rays of different wavelengths after passing through the imaging lens.Figure 12B The astigmatism curve of the imaging lens of Embodiment 6 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 12C The longitudinal chromatic aberration curve of the imaging lens of Embodiment 6 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Figure 12D The distortion curve of the imaging lens of Embodiment 6 is shown, which represents the distortion magnitude values corresponding to different image heights. According to Figures 12A to 12D it can be known that the imaging lens given in Embodiment 6 can achieve good imaging quality.

[0138] In summary, Embodiments 1 to 6 respectively satisfy the relationships shown in Table 13.

[0139] Conditional / Example 1 2 3 4 5 6 TTL / ImgH 1.06 1.06 1.06 1.06 1.06 1.06 tan(Semi - FOV)*f(mm) 8.22 8.21 8.21 8.22 8.22 8.22 (R11 + R12) / f 1.11 1.15 1.15 1.15 1.16 1.17 ET5 / CT5 0.78 0.54 0.60 0.61 0.67 0.61 ET3 / ET4 + ET6 / ET5 3.24 3.17 2.93 2.88 2.63 2.70 f2 / f1 -1.39 -1.69 -1.67 -1.35 -1.28 -1.35 1 / (R5 / R6 - R7 / R8) -0.55 -1.99 -1.52 -1.13 -0.82 -1.08 f12345 / f123 0.96 0.99 0.99 0.98 1.02 1.01 CT5 / CT8 1.43 1.79 1.77 2.41 2.40 2.31 (CT5 - CT4) / T45 1.48 0.42 0.40 1.02 1.31 1.23 CT7 / CT1 1.10 1.15 1.16 1.08 1.07 1.10 f / f4 0.28 0.00 0.04 0.05 0.05 0.02 (Vamin + Vbmin) / 2 30.06 30.39 30.23 32.54 34.94 33.25 ET8 / CT8 1.44 1.95 1.98 3.06 3.30 3.41 Vg 27.86 41.74 41.00 31.92 30.90 32.84 Np - Ng -0.07 -0.02 -0.02 -0.05 -0.06 -0.05

[0140] Table 13

[0141] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present 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 (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An imaging lens, characterized in that, It sequentially includes from the object side to the image side along the optical axis: A first lens with positive optical power, whose object side is convex and image side is concave, and its material is glass; A second lens with negative optical power, whose object side is convex and image side is concave; A third lens with positive optical power, whose object side is convex and image side is concave; A fourth lens with positive optical power, whose object side is concave and image side is convex; A fifth lens; A sixth lens with negative optical power, whose object side is convex and image side is concave; A seventh lens with positive optical power, whose object side is convex and image side is convex; An eighth lens with negative optical power, whose object side is concave and image side is concave; Among them, the number of lenses with optical power in the imaging lens is eight, and the imaging lens satisfies: 1.43 ≤ CT5 / CT8 ≤ 2.41, 1.0 < TTL / ImgH < 1.2, and 8.21 mm ≤ tan(Semi - FOV) f ≤ 8.22 mm; Among them, CT5 is the central thickness of the fifth lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface of the imaging lens, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, Semi-FOV is half of the maximum field of view angle of the imaging lens, and f is the total effective focal length of the imaging lens.

2. The imaging lens according to claim 1, wherein The imaging lens satisfies: -1.69 ≤ f2 / f1 ≤ -1.28, Among them, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

3. The imaging lens according to claim 1, wherein, The imaging lens satisfies: 1.11 ≤ (R11 + R12) / f ≤ 1.17, Among them, 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, and f is the total effective focal length of the imaging lens.

4. The imaging lens according to claim 1, wherein, The imaging lens satisfies: 1.07 ≤ CT7 / CT1 ≤ 1.16, Among them, CT1 is the central thickness of the first lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis.

5. The imaging lens according to claim 1, wherein The imaging lens satisfies: 47.8° ≥ Semi-FOV > 45°.

6. The imaging lens according to claim 2, wherein The imaging lens satisfies: 0.96 ≤ f12345 / f123 ≤ 1.02, Among them, f12345 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and f123 is the combined focal length of the first lens, the second lens and the third lens.

7. The imaging lens according to claim 4, wherein The imaging lens satisfies: 0.4 ≤ (CT5 - CT4) / T45 ≤ 1.48, Among them, CT5 is the central thickness of the fifth lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens along the optical axis.

8. The imaging lens according to any one of claims 1 to 7, characterized in that, The material of any one of the second lens to the eighth lens is plastic, and among them, the refractive index of any one of the lenses is greater than 1.

5.

9. The imaging lens according to claim 1, wherein The imaging lens satisfies: 27.86 ≤ Vg ≤ 41.74, Among them, Vg is the dispersion coefficient of the first lens.

10. The imaging lens according to claim 8, wherein, The imaging lens satisfies: -0.07 ≤ Np - Ng < 0, Among them, Np is the minimum value of the refractive indices of the respective lenses from the second lens to the eighth lens, and Ng is the refractive index of the first lens.

11. The imaging lens according to claim 1, wherein, The imaging lens satisfies: 30.06 ≤ (Vamin + Vbmin) / 2 ≤ 34.94, where Vamin is the minimum value of the dispersion coefficients of the respective lenses from the first lens to the fourth lens, and Vbmin is the minimum value of the dispersion coefficients of the respective lenses from the fifth lens to the eighth lens.

12. The imaging lens according to claim 1, wherein The imaging lens satisfies: -2 < 1 / (R5 / R6 - R7 / R8) ≤ -0.55, where R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, and R8 is the curvature radius of the image side surface of the fourth lens.

13. The imaging lens according to claim 1, wherein The imaging lens satisfies: 0.54 ≤ ET5 / CT5 < 0.8, where CT5 is the central thickness of the fifth lens on the optical axis, and ET5 is the edge thickness at the maximum effective diameter of the fifth lens.

14. The imaging lens according to claim 13, wherein, The imaging lens satisfies: 1.44 ≤ ET8 / CT8 ≤ 3.41, where CT8 is the central thickness of the eighth lens on the optical axis, and ET8 is the edge thickness at the maximum effective diameter of the eighth lens.

15. The imaging lens according to claim 1, wherein The imaging lens satisfies: 2.63 ≤ ET3 / ET4 + ET6 / ET5 ≤ 3.24, where ET3 is the edge thickness at the maximum effective diameter of the third lens, ET4 is the edge thickness at the maximum effective diameter of the fourth lens, ET5 is the edge thickness at the maximum effective diameter of the fifth lens, and ET6 is the edge thickness at the maximum effective diameter of the sixth lens.

16. The imaging lens according to claim 2, characterized in that, The imaging lens satisfies: 0 < f / f4 ≤ 0.28, where f is the total effective focal length of the imaging lens, and f4 is the effective focal length of the fourth lens.

Images