Camera lens

Abstract

The present application discloses a camera lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with a positive optical power; a third lens with an optical power; a fourth lens with a negative optical power; a fifth lens with a positive optical power; a sixth lens with an optical power; a seventh lens with a positive optical power; and an eighth lens with a negative optical power; wherein, the number of lenses with optical power in the camera lens is eight; the effective focal length f of the camera lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -3.5 ≤ (f1 + f2) / f < -1.5.

Description

Technical Field

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

[0002] With the development and progress of science and technology, current consumer electronic products such as mobile phones, VR / AR head-mounted devices, and drones are generally equipped with camera lenses for taking photos and videos, spatial recognition and positioning, etc. With product upgrades and the development of new functions, the requirements for lens imaging are getting higher and higher. The structures of six-piece or seven-piece lenses are no longer sufficient to effectively address these challenges, and eight-piece camera lens systems will gradually become the mainstream. The present invention relates to a camera lens composed of eight lenses, which has the technical advantages of low chromatic aberration, high resolution, and large field of view angle, and can well meet the high application requirements of current products. Summary of the Invention

[0003] This application provides such a camera lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with positive optical power; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with positive optical power; a sixth lens with optical power; a seventh lens with positive optical power; and an eighth lens with negative optical power; wherein, the number of lenses with optical power in the camera lens is eight; the effective focal length f of the camera lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -3.5 ≤ (f1 + f2) / f < -1.5.

[0004] In one embodiment, the central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0.9 ≤ T78 / (CT6 + CT7 + CT8) < 1.5.

[0005] In one embodiment, the effective focal length f2 of the second lens and the maximum semi-field of view angle Semi-FOV of the camera lens satisfy: 6.0 mm < f2 × tan(Semi-FOV) ≤ 10 mm.

[0006] In one embodiment, the effective focal length f of the camera lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0.5 < (f7 + f8) / f < 1.5.

[0007] In one embodiment, the effective focal length f of the camera lens and the maximum field of view angle FOV of the camera lens satisfy: f × tan(FOV / 3) > 4.0 mm.

[0008] In one embodiment, the effective focal length f of the camera lens, the maximum semi-field angle Semi-FOV of the camera lens, and the entrance pupil diameter EPD of the camera lens satisfy: 1.5 < f × tan(Semi-FOV) / EPD ≤ 2.0.

[0009] In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f4 of the fourth lens satisfy: 1.5 < (f5 - f4) / f5 < 3.5.

[0010] In one embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: -4.0 < f1 / R1 < -3.0.

[0011] In one embodiment, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.6 < (CT4 + CT5) / T34 < 2.5.

[0012] In one embodiment, the effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 8.0 < f2 / CT2 < 12.

[0013] In one embodiment, the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 2.5 < ∑AT / (T34 + T56) < 3.0.

[0014] In one embodiment, the effective focal length f of the camera lens, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 5.0 < f / (CT6 + CT7) < 7.0.

[0015] In one embodiment, the effective focal length f of the camera lens, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 7.0 < f / (CT5 - CT4) < 10.

[0016] In one embodiment, the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens, and the Abbe number V4 of the fourth lens satisfy: 25 < (V1 + V2 + V3 + V4) / 4 < 40.

[0017] In one embodiment, the Abbe number V2 of the second lens and the Abbe number V4 of the fourth lens satisfy: 0 < (V2 + V4) / (V2 - V4) < 3.0.

[0018] In one embodiment, the refractive index N2 of the second lens, the refractive index N4 of the fourth lens, the Abbe number V2 of the second lens, and the Abbe number V4 of the fourth lens satisfy: 35 < V2 / N2 + V4 / N4 < 45.

[0019] In one embodiment, the refractive index of at least one of the first lens to the fourth lens is greater than or equal to 1.70.

[0020] The imaging lens provided in this application is an eight-piece imaging lens. By reasonably distributing the optical power of the lenses and optimizing the effective focal lengths of the first lens and the second lens and the effective focal length of the imaging lens within a reasonable range, the chromatic aberration of the imaging lens can be better reduced, and higher imaging quality can be obtained. At the same time, the imaging lens has the characteristic of a large field of view, and can better meet the application requirements of the main camera on future high-end smart phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects, and advantages of this application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 FIG. 1 shows a schematic structural diagram of an imaging lens according to Embodiment 1 of this application;

[0023] Figures 2A to 2D FIGS. 2-5 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 1;

[0024] Figure 3 FIG. 6 shows a schematic structural diagram of an imaging lens according to Embodiment 2 of this application;

[0025] Figures 4A to 4D FIGS. 7-10 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 2;

[0026] Figure 5 FIG. 11 shows a schematic structural diagram of an imaging lens according to Embodiment 3 of this application;

[0027] Figures 6A to 6D FIGS. 12-15 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 3;

[0028] Figure 7 FIG. 16 shows a schematic structural diagram of an imaging lens according to Embodiment 4 of this application;

[0029] Figures 8A to 8D FIGS. 17-20 respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 4;

[0030] Figure 9Shows a schematic structural diagram of a camera lens according to Embodiment 5 of the present application;

[0031] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the camera lens of Embodiment 5;

[0032] Figure 11 Shows a schematic structural diagram of a camera lens according to Embodiment 6 of the present application;

[0033] Figures 12A to 12D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the camera lens of Embodiment 6;

[0034] Figure 13 Shows a schematic structural diagram of a camera lens according to Embodiment 7 of the present application;

[0035] Figures 14A to 14D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the camera lens of Embodiment 7;

[0036] Figure 15 Shows a schematic structural diagram of a camera lens according to Embodiment 8 of the present application; and

[0037] Figures 16A to 16D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the camera lens of Embodiment 8. Detailed Embodiments

[0038] 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.

[0039] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0040] In the drawings, for the sake of clarity, the thickness, dimensions, and shape 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 only examples and are not drawn to an exact scale.

[0041] In this text, 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 to be 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.

[0042] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude 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.

[0043] 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.

[0044] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0045] The features, principles and other aspects of the present application will be described in detail below.

[0046] According to an exemplary embodiment of the present application, an imaging lens 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. There may be a spacing distance between any two adjacent lenses among the first lens to the eighth lens.

[0047] In an exemplary embodiment, the first lens may have a negative focal power, the second lens may have a positive focal power, the third lens may have a positive or negative focal power, the fourth lens may have a negative focal power, the fifth lens may have a positive focal power, the sixth lens may have a positive or negative focal power; the seventh lens may have a positive focal power; the eighth lens may have a negative focal power. By reasonably distributing the positive and negative focal powers of the respective lenses of the camera lens, further, controlling the effective focal length f of the camera lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens to satisfy: -3.5 ≤ (f1 + f2) / f < -1.5 is beneficial to correcting the chromatic aberration of the camera lens, obtaining a high imaging quality, and at the same time, making the camera lens have the characteristic of a large field of view.

[0048] In an exemplary embodiment, the camera lens according to the present application may satisfy: 0.9 ≤ T78 / (CT6 + CT7 + CT8) < 1.5, where CT6 is the central thickness of the sixth lens on the optical axis, CT7 is the central thickness of the seventh lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis. Satisfying 0.9 ≤ T78 / (CT6 + CT7 + CT8) < 1.5 can better correct the coma aberration and field curvature aberration of the system and ensure the imaging clarity of the edge picture.

[0049] In an exemplary embodiment, the camera lens according to the present application may satisfy: 6.0 mm < f2 × tan(Semi-FOV) ≤ 10 mm, where f2 is the effective focal length of the second lens and Semi-FOV is the maximum semi-field of view angle of the camera lens. Satisfying 6.0 mm < f2 × tan(Semi-FOV) ≤ 10 mm can effectively balance and control the low-order aberrations of the camera lens, reduce the sensitivity to tolerances, obtain a high imaging quality, and at the same time, make the camera lens have the characteristic of a large field of view.

[0050] In an exemplary embodiment, the camera lens according to the present application may satisfy: 0.5 < (f7 + f8) / f < 1.5, where f is the effective focal length of the camera lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. More specifically, f7, f8, and f may further satisfy: 0.7 ≤ (f7 + f8) / f ≤ 1.2. Satisfying 0.5 < (f7 + f8) / f < 1.5 and reasonably distributing the focal powers of the seventh lens and the eighth lens is beneficial to correcting the astigmatism aberration of the system and improving the off-axis field image quality.

[0051] In an exemplary embodiment, the camera lens according to the present application can satisfy: f×tan(FOV / 3)>4.0mm, where f is the effective focal length of the camera lens and FOV is the maximum field of view angle of the camera lens. More specifically, f and FOV can further satisfy: 4.0mm < f×tan(FOV / 3) < 5.5mm. Satisfying f×tan(FOV / 3)>4.0mm can obtain a larger lens imaging surface, which is beneficial to matching a high-pixel chip and obtaining a high-resolution imaging effect.

[0052] In an exemplary embodiment, the camera lens according to the present application can satisfy: 1.5 < f×tan(Semi-FOV) / EPD ≤ 2.0, where f is the effective focal length of the camera lens, Semi-FOV is the maximum semi-field of view angle of the camera lens, and EPD is the entrance pupil diameter of the camera lens. Satisfying 1.5 < f×tan(Semi-FOV) / EPD ≤ 2.0 is beneficial to balancing the requirements of the field of view angle and aperture specifications of the lens, and can ensure a larger lens aperture while obtaining a larger field of view range.

[0053] In an exemplary embodiment, the camera lens according to the present application can satisfy: 1.5 < (f5 - f4) / f5 < 3.5, where f5 is the effective focal length of the fifth lens and f4 is the effective focal length of the fourth lens. Satisfying 1.5 < (f5 - f4) / f5 < 3.5 is beneficial to reasonably sharing the optical power of the system, better balancing the spherical aberration of the system, and ensuring the manufacturability of the two lenses at the same time.

[0054] In an exemplary embodiment, the camera lens according to the present application can satisfy: -4.0 < f1 / R1 < -3.0, where f1 is the effective focal length of the first lens and R1 is the curvature radius of the object side surface of the first lens. Satisfying -4.0 < f1 / R1 < -3.0 is beneficial to ensuring the imaging quality of the central field of view of the picture, and at the same time having the advantage of relatively high relative brightness of the edge picture.

[0055] In an exemplary embodiment, the camera lens according to the present application can satisfy: 1.6 < (CT4 + CT5) / T34 < 2.5, where CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis. Satisfying 1.6 < (CT4 + CT5) / T34 < 2.5 is beneficial to correcting the spherical aberration of the system and ensuring better imaging quality.

[0056] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 8.0 < f2 / CT2 < 12, where f2 is the effective focal length of the second lens, and CT2 is the central thickness of the second lens on the optical axis. More specifically, f2 and CT2 may further satisfy: 8.0 < f2 / CT2 < 11. Satisfying 8.0 < f2 / CT2 < 12 can better correct the spherical aberration of the system while ensuring the manufacturability of the second lens.

[0057] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 2.5 < ∑AT / (T34 + T56) < 3.0, where ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. Satisfying 2.5 < ∑AT / (T34 + T56) < 3.0 is beneficial to correcting the field curvature by reasonably controlling the proportional relationship of the air gaps between the lenses and ensuring that the best imaging planes of each field of view are on one plane.

[0058] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 5.0 < f / (CT6 + CT7) < 7.0, where f is the effective focal length of the imaging lens, CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. Satisfying 5.0 < f / (CT6 + CT7) < 7.0 is beneficial to obtaining a shorter total optical length TTL and meeting the requirements of lens miniaturization.

[0059] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 7.0 < f / (CT5 - CT4) < 10, where f is the effective focal length of the imaging lens, CT4 is the central thickness of the fourth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. Satisfying 7.0 < f / (CT5 - CT4) < 10 is beneficial for the fourth lens and the fifth lens to reasonably share the optical power, correct the field curvature of the marginal field of view, and at the same time ensure the manufacturability of the lens.

[0060] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 25 < (V1 + V2 + V3 + V4) / 4 < 40, where V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens. Satisfying 25 < (V1 + V2 + V3 + V4) / 4 < 40 is beneficial to correcting the axial chromatic aberration of the system and improving the image quality of various complex light.

[0061] In an exemplary embodiment, the camera lens according to the present application may satisfy: 0 < (V2 + V4) / (V2 - V4) < 3.0, where V2 is the Abbe number of the second lens and V4 is the Abbe number of the fourth lens. Satisfying 0 < (V2 + V4) / (V2 - V4) < 3.0 is beneficial to correcting the lateral chromatic aberration of the system and effectively reducing the purple fringing phenomenon.

[0062] In an exemplary embodiment, the camera lens according to the present application may satisfy: 35 < V2 / N2 + V4 / N4 < 45, where N2 is the refractive index of the second lens, N4 is the refractive index of the fourth lens, V2 is the Abbe number of the second lens, and V4 is the Abbe number of the fourth lens. Satisfying 35 < V2 / N2 + V4 / N4 < 45 is beneficial to selecting lens materials with stable performance and good mass production characteristics, and ensuring the mass producibility of the lens.

[0063] In an exemplary embodiment, the refractive index of at least one of the first lens to the fourth lens is greater than or equal to 1.70, which is beneficial to correcting and reducing the spherical aberration of the system, improving the overall image quality of the picture, and at the same time beneficial to obtaining a shorter total optical length TTL.

[0064] In an exemplary embodiment, the camera lens according to the present application further includes a diaphragm disposed between the first lens and the second lens.

[0065] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis may be, for example, in the range of 11.0 mm to 12.0 mm.

[0066] In an exemplary embodiment, the camera lens according to the present application may satisfy: FOV > 80°, where FOV is the maximum field of view angle of the camera lens. More specifically, FOV may be, for example, in the range of 83.0° to 95.0°, which is beneficial to realizing characteristics such as a large image surface.

[0067] In an exemplary embodiment, the effective focal length f of the camera lens may be, for example, in the range of 8.0 mm to 8.7 mm, the effective focal length f1 of the first lens may be, for example, in the range of -36.8 mm to -25.1 mm, the effective focal length f2 of the second lens may be, for example, in the range of 7.7 mm to 9.1 mm, the effective focal length f3 of the third lens may be, for example, in the range of -286.0 mm to 6574.0 mm, the effective focal length f4 of the fourth lens may be, for example, in the range of -32.7 mm to -19.0 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of 13.2 mm to 26.4 mm, the effective focal length f6 of the sixth lens may be, for example, in the range of -226.0 mm to 28.6 mm, the effective focal length f7 of the seventh lens may be, for example, in the range of 12.0 mm to 17.1 mm, and the effective focal length f8 of the eighth lens may be, for example, in the range of -7.4 mm to -6.0 mm.

[0068] In an exemplary embodiment, the above camera 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. The present application provides a camera lens having characteristics such as miniaturization, a large image plane, a large aperture, and high imaging quality. The camera 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 on-axis spacing between each lens, etc., the incident light can be effectively converged, the optical total length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the camera lens more conducive to production and processing.

[0069] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of 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 having 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 improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, thereby improving the imaging quality. Optionally, 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 mirror surface. 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 mirror surfaces.

[0070] The following further describes specific embodiments of the camera lens applicable to the above embodiments with reference to the accompanying drawings.

[0071] Example 1

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

[0073] As Figure 1 As shown, the camera lens sequentially includes a first lens E1, a stop STO, 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 from the object side to the image side.

[0074] The first lens E1 has a negative focal 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 focal 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 focal 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 focal 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 positive focal power, its object side surface S9 is a concave surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a negative focal 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 focal 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 focal power, its object side surface S15 is a concave surface, and its image side surface S16 is a convex 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.

[0075] Table 1 shows the basic parameter table of the camera lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0076]

[0077]

[0078] Table 1

[0079] In this example, the effective focal length f of the camera lens is 8.60 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.49 mm, and the maximum field of view FOV of the camera lens is 83.5°.

[0080] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0081]

[0082] Among them, x is the sagitta, which is the distance from the vertex of the aspherical surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, 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 gives the high-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0083]

[0084] Table 2

[0085] Figure 2A shows the axial chromatic aberration curve of the imaging lens of Embodiment 1, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the imaging lens of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2C shows the distortion curve of the imaging lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the lateral chromatic aberration curve of the imaging lens of Embodiment 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2A to 2D it can be seen that the imaging lens given in Embodiment 1 can achieve good imaging quality.

[0086] Example 2

[0087] The following will refer to Figures 3 to 4D to describe the imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the imaging lens according to Embodiment 2 of the present application.

[0088] As Figure 3 shown, the imaging lens sequentially includes a first lens E1, a stop STO, 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 from the object side to the image side.

[0089] The first lens E1 has a negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a positive 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 negative optical power, with its object side S7 being concave and its image side S8 being concave. The fifth lens E5 has a positive 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 concave. 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.

[0090] In this example, the effective focal length f of the camera lens is 8.31 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.49 mm, and the maximum field of view FOV of the camera lens is 93.0°.

[0091] Table 3 shows the basic parameter table of the camera lens of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the higher-order term coefficients of the aspherical mirror 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.

[0092]

[0093]

[0094] Table 3

[0095]

[0096] Table 4

[0097] Figure 4A Shows the axial chromatic aberration curve of the camera lens of Example 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4B Shows the astigmatism curve of the camera lens of Example 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C Shows the distortion curve of the camera lens of Example 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4D Shows the lateral chromatic aberration curve of the camera lens of Example 2, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 4A to 4DIt can be seen that the imaging lens given in Embodiment 2 can achieve good imaging quality.

[0098] Example 3

[0099] The following refers to Figures 5 to 6D the imaging lens according to Embodiment 3 of the present application is described. Figure 5 The schematic structural diagram of the imaging lens according to Embodiment 3 of the present application is shown.

[0100] As Figure 5 shown, the imaging lens sequentially includes a first lens E1, a stop STO, 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 from the object side to the image side.

[0101] The first lens E1 has a negative 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 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is concave, and its image side surface S10 is convex. 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 concave. The eighth lens E8 has a negative optical power, its object side surface S15 is concave, and its image side surface S16 is convex. 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.

[0102] In this example, the effective focal length f of the imaging lens is 8.63 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the imaging lens) is 11.49 mm, and the maximum field of view FOV of the imaging lens is 84.3°.

[0103] 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). Table 6 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.

[0104]

[0105] Table 5

[0106]

[0107]

[0108] Table 6

[0109] Figure 6A shows the axial chromatic aberration curve of the camera lens of Embodiment 3, which represents the deviation of the focus points of light rays of different wavelengths after passing through the lens. Figure 6B shows the astigmatism curve of the camera lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C shows the distortion curve of the camera lens of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6D shows the lateral chromatic aberration curve of the camera lens of Embodiment 3, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 6A to 6D it can be seen that the camera lens given in Embodiment 3 can achieve good imaging quality.

[0110] Example 4

[0111] The following refers to Figures 7 to 8D describes the camera lens according to Embodiment 4 of the present application. Figure 7 shows a schematic structural diagram of the camera lens according to Embodiment 4 of the present application.

[0112] As Figure 7 shown, the camera lens sequentially includes a first lens E1, a diaphragm STO, 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 from the object side to the image side.

[0113] The first lens E1 has a negative 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 concave surface, and its image side surface S10 is a convex 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 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 the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0114] In this example, the effective focal length f of the camera lens is 8.52 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.49 mm, and the maximum field of view FOV of the camera lens is 88.5°.

[0115] Table 7 shows the basic parameter table of the camera lens of Example 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 4, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0116]

[0117] Table 7

[0118]

[0119] Table 8

[0120] Figure 8A shows the axial chromatic aberration curve of the camera lens of Example 4, which represents the deviation of the converging points of light rays of different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the camera lens of Example 4, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 8C shows the distortion curve of the camera lens of Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D shows the lateral chromatic aberration curve of the camera lens of Example 4, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 8A to 8D it can be known that the camera lens given in Example 4 can achieve good imaging quality.

[0121] Example 5

[0122] The following refers to Figures 9 to 10D describes the camera lens according to Embodiment 5 of the present application. Figure 9 shows the structural schematic diagram of the camera lens according to Embodiment 5 of the present application.

[0123] As Figure 9 shown, the camera lens sequentially includes a first lens E1, a diaphragm STO, 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 from the object side to the image side.

[0124] 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 concave. The third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative focal power, its object side S7 is concave, and its image side S8 is concave. The fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a positive focal power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a positive focal power, its object side S13 is convex, and its image side S14 is concave. The eighth lens E8 has a negative focal power, its object side S15 is concave, and its image side S16 is concave. The filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0125] In this example, the effective focal length f of the camera lens is 8.05 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.25 mm, and the maximum field of view FOV of the camera lens is 93.4°.

[0126] Table 9 shows the basic parameter table of the camera lens of Example 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 10-1 and 10-2 show the higher-order term coefficients that can be used for each aspherical mirror surface in Example 5, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0127]

[0128]

[0129] Table 9

[0130] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.6848E-01 2.4539E-02 1.0991E-03 -1.0233E-03 -3.8656E-05 -7.7383E-05 -7.3209E-05 S2 -2.4664E-01 1.4981E-02 2.2136E-03 -8.8085E-04 9.6721E-05 1.4763E-05 -1.7275E-06 S3 5.5839E-02 4.7014E-03 1.2414E-03 -6.8212E-04 5.5835E-05 -8.4041E-06 -2.9691E-05 S4 -6.0346E-02 1.0746E-02 -1.6984E-03 5.2433E-04 -2.5893E-04 2.6289E-05 -1.5920E-06 S5 -3.6038E-01 3.9524E-02 -3.4909E-03 7.5880E-04 1.9125E-04 3.8974E-04 -2.7476E-05 S6 -2.5786E-01 1.9537E-02 -2.3372E-03 -1.2472E-03 1.9983E-04 5.4936E-04 2.9745E-04 S7 -6.3073E-01 2.3982E-02 2.8016E-03 -1.7725E-03 -7.3606E-04 1.2366E-04 2.7370E-04 S8 -4.0201E-01 7.2294E-02 2.4743E-02 -1.2051E-02 8.2667E-03 -3.8351E-03 2.5070E-03 S9 -6.5952E-02 -3.3582E-02 2.0217E-02 -1.6661E-02 1.2246E-02 -7.1611E-03 3.6520E-03 S10 -9.5487E-01 2.6353E-02 4.4514E-03 5.2512E-05 1.2667E-02 -1.8341E-03 1.3284E-03 S11 -2.3832E+00 -1.9954E-01 5.3886E-02 2.6565E-02 4.9675E-02 -5.1685E-03 1.5274E-03 S12 -2.6319E+00 5.8060E-01 -5.6833E-03 -1.5712E-02 -1.6976E-02 5.1122E-04 1.4746E-02 S13 -5.4321E+00 4.2274E-01 1.2361E-01 -1.6109E-01 -5.3657E-02 2.9974E-02 2.8904E-03 S14 -1.3107E+00 -5.6695E-01 3.7883E-01 -1.5532E-01 8.0793E-02 -2.4332E-03 -2.2797E-02 S15 3.7223E+00 -2.4252E-01 7.9298E-02 -7.4391E-02 7.8269E-02 -9.8888E-02 5.7174E-02 S16 -2.7493E+00 4.0789E-01 5.1893E-02 -1.3056E-01 1.3815E-01 -8.9138E-02 7.8931E-03

[0131] Table 10-1

[0132]

[0133]

[0134] Table 10-2

[0135] Figure 10A Shows the axial chromatic aberration curve of the camera lens of 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 camera lens of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature.Figure 10C The distortion curve of the imaging lens of Example 5 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 10D The longitudinal chromatic aberration curve of the imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after light passes 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.

[0136] Example 6

[0137] The following refers to Figures 11 to 12D and describes the imaging lens according to Embodiment 6 of the present application. Figure 11 The structural schematic diagram of the imaging lens according to Embodiment 6 of the present application is shown.

[0138] As Figure 11 shown, the imaging lens sequentially includes a first lens E1, a stop STO, 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 from the object side to the image side.

[0139] 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 convex. 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 concave, and its image surface S8 is concave. The fifth lens E5 has a positive focal power, its object surface S9 is concave, and its image surface S10 is convex. 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 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.

[0140] In this example, the effective focal length f of the imaging lens is 8.56 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S19 of the imaging lens) is 11.49 mm, and the maximum field of view FOV of the imaging lens is 83.6°.

[0141] Table 11 shows the basic parameter table of the camera lens of Embodiment 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 12 shows the high-order term coefficients of each aspherical mirror surface that can be used in Embodiment 6, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0142]

[0143]

[0144] Table 11

[0145]

[0146] Table 12

[0147] Figure 12A shows the axial chromatic aberration curve of the camera lens of Embodiment 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the camera lens of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the camera lens of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12D shows the lateral chromatic aberration curve of the camera 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 camera lens given in Embodiment 6 can achieve good imaging quality.

[0148] Example 7

[0149] The following refers to Figures 13 to 14D to describe the camera lens according to Embodiment 7 of the present application. Figure 13 shows a schematic structural diagram of the camera lens according to Embodiment 7 of the present application.

[0150] As Figure 13 shown, the camera lens sequentially includes a first lens E1, a diaphragm STO, 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 from the object side to the image side.

[0151] 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 positive focal power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a negative focal power, its object side S11 is convex, and its image side S12 is concave. 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 convex. 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.

[0152] In this example, the effective focal length f of the camera lens is 8.60 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.49 mm, and the maximum field of view FOV of the camera lens is 85.7°.

[0153] Table 13 shows the basic parameter table of the camera lens of Example 7, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 14 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 7, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0154]

[0155] Table 13

[0156]

[0157]

[0158] Table 14

[0159] Figure 14A shows the axial chromatic aberration curve of the camera lens of 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 camera lens of Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14C shows the distortion curve of the camera lens of Example 7, which represents the distortion magnitude values corresponding to different image heights. Figure 14D shows the lateral chromatic aberration curve of the camera lens of 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 14DIt can be seen that the camera lens given in Embodiment 7 can achieve good imaging quality.

[0160] Example 8

[0161] The following refers to Figures 15 to 16D a description of a camera lens according to Embodiment 8 of the present application. Figure 15 FIG. shows a schematic structural diagram of a camera lens according to Embodiment 8 of the present application.

[0162] As Figure 15 shown, the camera lens sequentially includes a first lens E1, a diaphragm STO, 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 from the object side to the image side.

[0163] The first lens E1 has a negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive focal power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a negative focal power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive focal power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative focal power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a positive focal power, its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has a negative focal 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.

[0164] In this example, the effective focal length f of the camera lens is 8.64 mm, the total length TTL of the camera lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the camera lens) is 11.49 mm, and the maximum field of view FOV of the camera lens is 84.7°.

[0165] Table 15 shows the basic parameter table of the camera lens of Embodiment 8, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 16 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 8, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0166]

[0167] Table 15

[0168]

[0169] Table 16

[0170] Figure 16A shows the axial chromatic aberration curve of the camera lens of Example 8, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 16B shows the astigmatism curve of the camera lens of Example 8, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 16C shows the distortion curve of the camera lens of Example 8, which represents the distortion magnitude values corresponding to different image heights. Figure 16D shows the lateral chromatic aberration curve of the camera lens of Example 8, 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 camera lens given in Example 8 can achieve good imaging quality.

[0171] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0172] Conditional / Example 1 2 3 4 5 6 7 8 f2 × tan(Semi - FOV) 6.95 9.39 7.35 7.81 9.58 7.11 7.29 7.41 T78 / (CT6 + CT7 + CT8) 1.00 1.01 1.01 1.38 0.93 0.97 1.01 1.00 (f1 + f2) / f -2.09 -2.29 -1.97 -2.38 -3.45 -2.24 -2.11 -1.98 (f7 + f8) / f 0.94 0.77 0.99 0.79 0.75 0.83 1.13 0.94 f × tan(FOV / 3) 4.54 5.00 4.61 4.82 4.86 4.53 4.68 4.64 f × tan(Semi - FOV) / EPD 1.65 1.95 1.68 1.80 1.96 1.65 1.72 1.69 (f5 - f4) / f5 3.10 2.26 3.31 2.79 1.79 3.12 3.28 3.20 f1 / R1 -3.13 -3.11 -3.28 -3.59 -3.54 -3.30 -3.21 -3.27 (CT4 + CT5) / T34 2.14 2.00 2.38 1.91 1.90 2.13 2.27 2.37 f2 / CT2 9.02 10.69 9.62 8.48 10.86 9.38 9.15 9.63 ∑AT / (T34 + T56) 2.83 2.87 2.82 2.69 2.60 2.65 2.87 2.81 f / (CT6 + CT7) 6.46 5.58 6.61 6.25 5.64 6.56 6.61 6.63 f / (CT5 - CT4) 8.01 7.93 7.42 8.32 9.20 7.80 7.55 7.29 (V1 + V2 + V3 + V4) / 4 29.33 38.66 29.33 35.37 35.38 29.33 29.33 29.33 (V2 + V4) / (V2 - V4) 2.39 2.80 2.39 2.09 2.41 2.39 2.39 2.39 V2 / N2 + V4 / N4 39.68 38.82 39.68 42.26 36.79 39.68 39.68 39.68

[0173] Table 17

[0174] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the camera lens described above.

[0175] The above description is only for the preferred embodiments of this application and the description 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. A camera lens, characterized in that, In order from the object side to the image side along the optical axis, it includes: A first lens with negative optical power, whose object side is convex and image side is concave; A second lens with positive optical power, whose object side is convex; A third lens with optical power, whose object side is convex and image side is concave; A fourth lens with negative optical power, whose image side is concave; A fifth lens with positive optical power, whose image side is convex; A sixth lens with 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 concave; and An eighth lens with negative optical power, whose object side is concave; wherein, The number of lenses with optical power in the imaging lens is eight; The effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -3.45 ≤ (f1 + f2) / f ≤ -1.

97.

2. The camera lens according to claim 1, wherein, The central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0.9 ≤ T78 / (CT6 + CT7 + CT8) ≤ 1.

38.

3. The camera lens according to claim 1, wherein, The effective focal length f2 of the second lens and the maximum half field of view Semi-FOV of the imaging lens satisfy: 6.95 mm ≤ f2 × tan(Semi-FOV) ≤ 9.58 mm.

4. The camera lens according to claim 1, wherein, The effective focal length f of the imaging lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0.75 ≤ (f7 + f8) / f ≤ 1.

13.

5. The camera lens according to claim 1, wherein, The effective focal length f of the imaging lens and the maximum field of view FOV of the imaging lens satisfy: 4.53 mm ≤ f × tan(FOV / 3) ≤ 5.0 mm.

6. The camera lens according to claim 1, wherein, The effective focal length f of the imaging lens, the maximum half field of view Semi-FOV of the imaging lens, and the entrance pupil diameter EPD of the imaging lens satisfy: 1.65 ≤ f × tan(Semi-FOV) / EPD ≤ 2.

0.

7. The camera lens according to claim 1, wherein, The effective focal length f5 of the fifth lens and the effective focal length f4 of the fourth lens satisfy: 1.79 ≤ (f5 - f4) / f5 ≤ 3.

31.

8. The camera lens according to claim 1, wherein, The effective focal length f1 of the first lens and the radius of curvature R1 of the object side of the first lens satisfy: -3.59 ≤ f1 / R1 ≤ -3.

11.

9. The camera lens according to claim 1, wherein, The central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.90 ≤ (CT4 + CT5) / T34 ≤ 2.

38.

10. The camera lens according to claim 1, wherein, The effective focal length f2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 8.48 ≤ f2 / CT2 ≤ 10.

86.

11. The camera lens according to claim 1, wherein, The sum ∑AT of the air spaces on the optical axis between any two adjacent lenses among the first lens to the eighth lens, the air space T34 between the third lens and the fourth lens on the optical axis, and the air space T56 between the fifth lens and the sixth lens on the optical axis satisfy: 2.60 ≤ ∑AT / (T34 + T56) ≤ 2.

87.

12. The camera lens according to claim 1, wherein, The effective focal length f of the imaging lens, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 5.58 ≤ f / (CT6 + CT7) ≤ 6.

63.

13. The camera lens according to claim 1, wherein, The effective focal length f of the imaging lens, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 7.29 ≤ f / (CT5 - CT4) ≤ 9.

20.

14. The camera lens according to any one of claims 1 to 13, wherein, The Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens, and the Abbe number V4 of the fourth lens satisfy: 29.33 ≤ (V1 + V2 + V3 + V4) / 4 ≤ 38.

66.

15. The camera lens according to any one of claims 1 to 13, wherein,The Abbe number V2 of the second lens and the Abbe number V4 of the fourth lens satisfy: 2.09 ≤ (V2 + V4) / (V2 - V4) ≤ 2.

80.

16. The camera lens according to any one of claims 1 to 13, wherein, The refractive index N2 of the second lens, the refractive index N4 of the fourth lens, the Abbe number V2 of the second lens, and the Abbe number V4 of the fourth lens satisfy: 36.79 ≤ V2 / N2 + V4 / N4 ≤ 42.

26.

17. The camera lens according to any one of claims 1 to 13, wherein, The refractive index of at least one lens among the first lens to the fourth lens is greater than or equal to 1.70.

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