Imaging lens

Abstract

The present application discloses an imaging lens. The imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens with a positive optical power; a second lens; a third lens, whose image side is concave; a fourth lens, whose image side is convex; a fifth lens; a sixth lens with a positive optical power, whose object side is convex and image side is convex; and a seventh lens with a negative optical power, whose object side is concave and image side is concave. Among them, the central thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, half of the diagonal length ImgH of the effective pixel region of the imaging lens, and the distance BFL on the optical axis from the image side of the seventh lens to the imaging surface of the imaging lens satisfy: 2.0 < CT4 / T45 < 9.0 and 1.5 < ImgH / BFL < 3.0.

Description

Technical Field

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

[0002] The length of the lens has always been an important factor restricting the imaging quality of the lens. However, the thickness of smart phones restricts the lens from being too long, which makes the performance of the lens unable to be fully exerted. The birth of the "retractable lens" has broken through the shackles of the existing optical design of smart phones and significantly improved the imaging quality. The "retractable lens" is in the extended state during the working state, and the lens protrudes from the surface of the mobile phone rear shell. At this time, the lens has a long length and can fully exert high performance; in the non-working state, the lens is in the retracted state, and the lens does not protrude from the surface of the mobile phone rear shell, and there will be no inconvenience when using other functions of the mobile phone.

[0003] The "retractable lens" usually requires a long optical back focal length to achieve the retractable function of the lens. However, in the mainstream trend of miniaturization, the improvement of the performance and the reduction of the size of the image sensor also make the design freedom of the corresponding lens smaller and smaller, increasing the design difficulty of the lens. The contradiction between pursuing a large image plane and shortening the total length of the lens has always existed. Therefore, it is of great practical significance to design a seven-piece imaging lens with a long optical back focal length, a large image plane, and the retractable function of the lens. Summary of the Invention

[0004] This application provides such an imaging lens. The imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; a third lens with a concave image side; a fourth lens with a convex image side; a fifth lens; a sixth lens with positive optical power, with a convex object side and a convex image side; and a seventh lens with negative optical power, with a concave object side and a concave image side. Among them, the central thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, half of the diagonal length ImgH of the effective pixel area of the imaging lens, and the distance BFL from the image side of the seventh lens to the imaging plane of the imaging lens on the optical axis satisfy: 2.0 < CT4 / T45 < 9.0 and 1.5 < ImgH / BFL < 3.0.

[0005] In one embodiment, at least one of the second lens and the third lens has negative optical power, and at least one of the fourth lens and the fifth lens has negative optical power.

[0006] In one embodiment, the distance TTL from the object side of the first lens to the imaging plane of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the imaging lens satisfy: 1.0 < TTL / ImgH < 2.0.

[0007] In one embodiment, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 5.0 < (CT4 + CT5 + CT6) / CT7 < 12.5.

[0008] In one implementation, the effective focal length f of the imaging lens and half of the maximum field of view (Semi-FOV) of the imaging lens satisfy: 7.5 <f / tan(Semi-FOV)<11.0。

[0009] In one embodiment, the effective focal length f of the imaging lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 0.5 <f / (f6+|f7|)<1.5。

[0010] In one embodiment, the effective focal length f6 of the sixth lens, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy: 0 <f6 / (R11-R12)<1.0。

[0011] In one embodiment, the effective focal length f7 of the seventh lens, the radius of curvature R13 of the object-side surface of the seventh lens, and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 0.5 <f7 / (R13+R14)<2.5。

[0012] In one embodiment, the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy: 0 < (R13 + R14) / (R13 - R14) < 0.8.

[0013] In one embodiment, the radius of curvature R1 of the object side of the first lens, the radius of curvature R4 of the image side of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 5.0 < (R1 + R4) / (CT1 + CT2) < 9.0.

[0014] In one embodiment, the effective half-aperture DT41 of the object side of the fourth lens, the effective half-aperture DT42 of the image side of the fourth lens, and the effective half-aperture DT51 of the object side of the fifth lens satisfy: 1.0 < (DT41 + DT42) / DT51 < 2.0.

[0015] In one embodiment, the edge thickness ET4 at the maximum effective radius of the fourth lens, the edge thickness ET6 at the maximum effective radius of the sixth lens, and the edge thickness ET7 at the maximum effective radius of the seventh lens satisfy: 0 < (ET4 + ET6) / ET7 < 7.0.

[0016] In one embodiment, the distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and the distance SAG72 between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens, satisfy: -0.1 < (SAG71 - SAG72) / (SAG71 + SAG72) < 1.0.

[0017] The seven-element imaging lens proposed in this application combines good image quality, long back focal length, and large image plane characteristics. It can realize the lens extension function. The rational design of the lens surface shape, optical power, thickness of the fourth lens, and the spacing of the fourth and fifth lenses is conducive to balancing aberrations and spherical aberrations, improving the lens resolution, and also helps to improve the stability of lens assembly. The rational design of the image height and optical back focal length of the imaging lens ensures that the lens has a sufficiently large imaging area while having a long optical back focal length, thereby realizing the extension function of the lens. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown;

[0020] Figures 2A to 2C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 1 are shown respectively.

[0021] Figure 3 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown;

[0022] Figures 4A to 4C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 2 are shown respectively.

[0023] Figure 5 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown;

[0024] Figures 6A to 6C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 3 are shown respectively.

[0025] Figure 7 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown;

[0026] Figures 8A to 8C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 4 are shown respectively.

[0027] Figure 9 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown;

[0028] Figures 10A to 10C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 5 are shown respectively.

[0029] Figure 11 A schematic diagram of the imaging lens according to Embodiment 6 of this application is shown;

[0030] Figures 12A to 12C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 6 are shown respectively.

[0031] Figure 13 A schematic diagram of the imaging lens according to Embodiment 7 of this application is shown; and

[0032] Figures 14A to 14C The on-axis chromatic aberration curve, distortion curve, and magnification chromatic aberration curve of the imaging lens of Example 7 are shown respectively. Detailed Implementation

[0033] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0034] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0035] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0036] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0037] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0038] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] The features, principles and other aspects of this application are described in detail below.

[0041] An imaging lens according to an exemplary embodiment of this application may include seven lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. These seven lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first to seventh lenses may have a gap distance between them.

[0042] In an exemplary embodiment, the first lens has positive optical power, the sixth lens has positive optical power, its object side is convex, its image side is convex, and the seventh lens has negative optical power, its object side is concave, and its image side is concave.

[0043] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 2.0 < CT4 / T45 < 9.0, where 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 on the optical axis.

[0044] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.5 < ImgH / BFL < 3.0, where ImgH is half of the diagonal length of the effective pixel area of the imaging lens, and BFL is the distance from the image side of the seventh lens to the imaging surface of the imaging lens on the optical axis.

[0045] The imaging lens according to an exemplary embodiment of the present application may include seven lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a positive optical power, the sixth lens has a positive optical power, its object side is convex, and its image side is convex. The seventh lens has a negative optical power, its object side is concave, and its image side is concave. By setting the central thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, half of the diagonal length ImgH of the effective pixel area of the imaging lens, and the distance BFL from the image side of the seventh lens to the imaging surface of the imaging lens on the optical axis to satisfy: 2.0 < CT4 / T45 < 9.0 and 1.5 < ImgH / BFL < 3.0, by controlling the surface shape, optical power of some lenses reasonably designed, and the ratio of the central thickness of the fourth lens to the air gap between the fourth lens and the fifth lens on the optical axis within a certain range, the thickness and interval distribution of the fourth lens and the fifth lens can be made more reasonable, which is beneficial to balancing aberrations, improving the lens resolution, and at the same time helps to improve the stability of lens assembly; by controlling the ratio of half of the image height of the imaging lens to the distance from the image side of the seventh lens to the imaging surface on the optical axis within a certain range, while ensuring that the lens has a sufficiently large imaging area, the lens can have a long optical back focal length, so as to achieve the telescopic function of the lens. The above settings make the seven-piece imaging lens proposed in the present application have the characteristics of good imaging quality, long back focal length, and large image surface.

[0046] In an exemplary embodiment, at least one of the second lens and the third lens has a negative optical power, and at least one of the fourth lens and the fifth lens has a negative optical power. This setting can make the optical power distribution of the lens more reasonable, effectively balance aberrations, and improve the resolution of the lens.

[0047] In an exemplary embodiment, the imaging lens of the present application may further include an aperture disposed on the object side of the first lens.

[0048] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0 < TTL / ImgH < 2.0, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, and ImgH is half of the diagonal length of the effective pixel area of the imaging lens. Satisfying 1.0 < TTL / ImgH < 2.0 controls the ratio of the distance on the optical axis from the object side surface of the first lens to the imaging surface to half of the image height within a certain range. While ensuring that the lens has a sufficient imaging area, the overall optical length of the lens is not too long, which is beneficial to the miniaturization of the lens.

[0049] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 5.0 < (CT4 + CT5 + CT6) / CT7 < 12.5, 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, 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. Controlling the ratio of the sum of the central thicknesses of the fourth, fifth, and sixth lenses to the central thickness of the seventh lens within a certain range can make the lens thickness distribution of the fourth, fifth, sixth, and seventh lenses more reasonable, which is beneficial to balancing aberrations, improving the lens resolution, and at the same time contributing to improving the stability of lens assembly.

[0050] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 7.5 < f / tan(Semi-FOV) < 11.0, where f is the effective focal length of the imaging lens, and Semi-FOV is half of the maximum field angle of the imaging lens. Satisfying 7.5 < f / tan(Semi-FOV) < 11.0 controls the ratio of the effective focal length of the imaging lens to the tangent value of half of the maximum field angle of the imaging lens within a certain range, which can ensure that the field angle and focal length of the imaging lens are within the optimal range, facilitating the imaging lens to obtain a large image plane feature to obtain a sufficient back focus and making the imaging lens parameters meet the basic requirements.

[0051] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.5 < f / (f6 + |f7|) < 1.5, where f is the effective focal length of the imaging lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. Satisfying 0.5 < f / (f6 + |f7|) < 1.5 controls the effective focal lengths of the sixth and seventh lenses within a certain range, which can make the distribution of the optical power of the lens more reasonable, balance aberrations better, and is beneficial to improving the resolution of the system.

[0052] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0 < f6 / (R11 - R12) < 1.0, where f6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens. Controlling the ratio of the effective focal length of the sixth lens to the difference between the curvature radius of the object side surface of the sixth lens and the curvature radius of the image side surface of the sixth lens within a certain range can make the optical power and shape of the sixth lens more reasonable, contribute to balancing aberrations, improving the lens resolution, and also facilitating the processability of the sixth lens.

[0053] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.5 < f7 / (R13 + R14) < 2.5, where f7 is the effective focal length of the seventh lens, R13 is the curvature radius of the object side surface of the seventh lens, and R14 is the curvature radius of the image side surface of the seventh lens. Controlling the ratio of the effective focal length of the seventh lens to the sum of the curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens within a certain range can make the optical power and shape of the seventh lens more reasonable, contribute to balancing aberrations, improving the lens resolution, and facilitating the processability of the seventh lens.

[0054] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0 < (R13 + R14) / (R13 - R14) < 0.8, where R13 is the curvature radius of the object side surface of the seventh lens and R14 is the curvature radius of the image side surface of the seventh lens. Satisfying 0 < (R13 + R14) / (R13 - R14) < 0.8 can make the shape of the seventh lens more reasonable, avoid total reflection ghost images of the seventh lens, and facilitate the processability of the seventh lens.

[0055] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 5.0 < (R1 + R4) / (CT1 + CT2) < 9.0, where R1 is the curvature radius of the object side surface of the first lens, R4 is the curvature radius of the image side surface of the second lens, CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. Controlling the ratio of the sum of the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the second lens to the sum of the central thickness of the first lens and the central thickness of the second lens within a certain range can make the thickness distribution and shape of the first lens and the second lens more reasonable, contribute to balancing aberrations, improving the lens resolution, and at the same time help to improve the stability of lens assembly.

[0056] In an exemplary embodiment, the imaging lens according to this application satisfies: 1.0 < (DT41 + DT42) / DT51 < 2.0, where DT41 is the effective half-aperture of the object-side surface of the fourth lens, DT42 is the effective half-aperture of the image-side surface of the fourth lens, and DT51 is the effective half-aperture of the object-side surface of the fifth lens. By controlling the ratio of the effective half-aperture of the object-side surface of the fourth lens and the sum of the effective half-apertures of the image-side surface of the fourth lens to the effective half-aperture of the object-side surface of the fifth lens within a certain range, the effective diameters of the fourth and fifth lenses can be kept from being too large, which is beneficial for the miniaturization of the entire lens.

[0057] In an exemplary embodiment, the imaging lens according to this application satisfies: 0 < (ET4 + ET6) / ET7 < 7.0, where ET4 is the edge thickness at the maximum effective radius of the fourth lens, ET6 is the edge thickness at the maximum effective radius of the sixth lens, and ET7 is the edge thickness at the maximum effective radius of the seventh lens. Controlling the ratio of the sum of the edge thicknesses at the maximum effective radius of the fourth lens and the sixth lens to the edge thickness at the maximum effective radius of the seventh lens within a certain range allows for a more reasonable distribution of the edge thicknesses of the fourth, sixth, and seventh lenses. This improves the lens's manufacturability and facilitates subsequent lens assembly.

[0058] In an exemplary embodiment, the imaging lens according to this application satisfies: -0.1 < (SAG71 - SAG72) / (SAG71 + SAG72) < 1.0, where SAG71 is the distance on the optical axis between the intersection of the object-side surface of the seventh lens and the optical axis, and the vertex of the effective radius of the object-side surface of the seventh lens; SAG72 is the distance on the optical axis between the intersection of the image-side surface of the seventh lens and the optical axis, and the vertex of the effective radius of the image-side surface of the seventh lens. Satisfying -0.1 < (SAG71 - SAG72) / (SAG71 + SAG72) < 1.0 controls the sagitta of the object-side surface and the image-side surface of the seventh lens within a certain range, making the shape of the seventh lens more reasonable, avoiding excessive bending of the lens, and improving the manufacturability of the seventh lens.

[0059] In an exemplary embodiment, at least one of the mirror surfaces of each of the first lens to the seventh lens is an aspherical mirror surface. The present application does not specifically limit the specific numbers of spherical lenses and aspherical lenses. When focusing on the resolution quality, aspherical lenses can be used for all the lenses. The characteristics of an aspherical lens are that the curvature continuously changes from the center of the lens to the periphery of the lens. The characteristics of a spherical lens are that it has a constant curvature from the center to the periphery. 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 as much as possible the aberration that occurs during imaging, thereby improving the imaging quality. Optionally, the object side and the image side of each of the first lens to the seventh lens are both aspherical mirror surfaces.

[0060] In an exemplary embodiment, the effective focal length f of the imaging lens can be, for example, in the range of 6.7 mm to 8.8 mm, the effective focal length f1 of the first lens can be, for example, in the range of 7.9 mm to 25.8 mm, the effective focal length f2 of the second lens can be, for example, in the range of -25.8 mm to 30.3 mm, the effective focal length f3 of the third lens can be, for example, in the range of -35.1 mm to 55.1 mm, the effective focal length f4 of the fourth lens can be, for example, in the range of -22.5 mm to 37.1 mm, the effective focal length f5 of the fifth lens can be, for example, in the range of -256.0 mm to 272.0 mm, the effective focal length f6 of the sixth lens can be, for example, in the range of 3.6 mm to 4.5 mm, and the effective focal length f7 of the seventh lens can be, for example, in the range of -4.6 mm to -3.4 mm. The distance TTL from the object side of the first lens to the imaging surface of the imaging lens on the optical axis can satisfy 8.9 mm < TTL < 10.9 mm. The maximum half-field angle Semi-FOV of the imaging lens can be, for example, in the range of 37.1° to 40.2°. The half of the diagonal length of the effective pixel area of the imaging lens ImgH can be, for example, in the range of 5.7 mm to 7.0 mm.

[0061] In an exemplary embodiment, the imaging lens according to the present application further includes a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0062] This application proposes an imaging lens with characteristics such as a large image area, high pixel count, miniaturization, and high image quality. The imaging lens according to the above embodiments of this application can employ multiple lens elements, such as the seven elements mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, incident light rays can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the imaging lens more favorable for manufacturing. However, those skilled in the art should understand that the number of lenses constituting the imaging lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the imaging lens is not limited to including seven lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0063] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the imaging lens applicable to the above-described embodiments.

[0064] Example 1

[0065] The following is for reference Figures 1 to 2C The imaging lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the imaging lens according to Embodiment 1 of this application is shown.

[0066] like Figure 1 As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has negative optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface S1 to S16 and is finally imaged on the imaging surface S17.

[0067] In this example, the effective focal length f of the imaging lens is 8.73 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.74 mm, half the diagonal length ImgH of the effective pixel area of ​​the imaging lens is 6.93 mm, the maximum semi-FOV of the imaging lens is 39.09°, and the aperture number Fno of the imaging lens is 1.94.

[0068] Table 1 shows the basic parameters of the imaging lens of Example 1, where the units for radius of curvature, thickness and effective focal length are millimeters (mm).

[0069]

[0070] Table 1

[0071] In Example 1, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0072]

[0073] Where x is the distance vector from the vertex of the aspherical surface at 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 i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A14 that can be used for each aspherical mirror S1-S14 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0074]

[0075]

[0076] Table 2-1

[0077] Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.40E-05 -2.22E-05 -5.62E-06 1.02E-05 6.20E-06 -4.25E-06 4.73E-07 S2 -2.57E-05 9.66E-06 -2.39E-05 9.04E-06 9.01E-06 3.21E-06 -9.49E-06 S3 -1.03E-05 -1.79E-05 9.14E-06 -1.03E-05 8.04E-06 -1.56E-06 -1.13E-08 S4 2.64E-06 -2.10E-05 7.70E-06 -3.12E-06 9.55E-06 -2.74E-06 -1.73E-06 S5 -1.79E-05 3.93E-06 -2.07E-06 1.08E-07 -1.66E-06 -1.49E-06 9.54E-07 S6 -6.11E-05 4.14E-05 5.31E-06 8.10E-06 -6.93E-07 1.44E-06 -2.61E-06 S7 -2.29E-04 4.63E-05 1.53E-05 -9.40E-06 -3.23E-05 -1.93E-05 -1.18E-05 S8 -7.50E-04 -5.10E-04 -3.57E-04 -1.39E-04 -1.04E-04 -3.03E-05 -2.10E-05 S9 -8.12E-03 4.89E-03 -2.87E-03 2.01E-03 -1.89E-03 7.12E-04 -1.43E-03 S10 6.72E-03 1.57E-04 -6.03E-04 -4.62E-04 2.37E-04 -7.95E-06 -1.66E-05 S11 2.11E-03 4.61E-04 -9.69E-04 -4.47E-04 1.87E-04 -4.67E-05 4.13E-05 S12 -4.97E-03 2.47E-03 -6.14E-04 -2.45E-04 1.38E-04 -4.66E-04 2.78E-05 S13 -9.61E-03 1.42E-03 8.52E-04 -5.47E-04 -4.91E-04 4.21E-04 -2.10E-04 S14 1.14E-04 -2.68E-03 -1.22E-03 2.19E-04 2.17E-04 -2.43E-04 -3.65E-04

[0078] Table 2-2

[0079] Figure 2AThe on-axis chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2B The distortion curve of the imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 2C The magnification chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 2A to 2C It can be seen that the imaging lens given in Example 1 can achieve good imaging quality.

[0080] Example 2

[0081] The following is for reference Figures 3 to 4C The imaging lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 3 A schematic diagram of the imaging lens according to Embodiment 2 of this application is shown.

[0082] like Figure 3 As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has negative optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 8.42 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.85 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 6.93 mm, the maximum semi-field of view (Semi-FOV) is 39.36°, and the aperture number Fno is 1.88.

[0083] Table 3 shows the basic parameters of the imaging lens of Example 2, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 4-1 and 4-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0084]

[0085] Table 3

[0086]

[0087]

[0088] Table 4-1

[0089] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.10E-05 -3.31E-05 1.08E-05 2.37E-05 1.33E-05 -1.40E-05 2.09E-06 S2 7.58E-05 -4.59E-05 6.41E-05 3.24E-05 5.31E-05 -1.07E-05 -1.43E-05 S3 -1.39E-06 -4.38E-05 8.94E-05 1.95E-07 4.53E-05 4.64E-06 5.49E-06 S4 -3.92E-04 -1.92E-04 -3.55E-05 3.54E-05 5.62E-05 3.26E-05 1.18E-05 S5 -9.81E-05 -7.20E-06 1.46E-05 1.13E-05 -1.71E-06 -5.58E-06 7.59E-07 S6 -3.36E-04 5.37E-05 1.46E-05 2.18E-05 -3.73E-06 2.91E-06 1.81E-06 S7 -7.17E-04 -9.62E-05 4.59E-05 2.66E-05 -2.77E-05 -3.90E-05 -2.32E-05 S8 -1.46E-04 1.25E-04 -1.75E-04 6.81E-06 -6.18E-05 -6.26E-06 -8.43E-06 S9 -4.79E-03 2.04E-03 -1.73E-03 9.94E-04 -7.27E-04 3.61E-04 -4.27E-04 S10 4.55E-04 1.09E-03 -8.78E-05 2.44E-05 -2.05E-04 1.00E-04 -1.46E-05 S11 7.59E-04 1.66E-03 1.60E-04 -3.82E-04 -1.71E-04 -2.57E-05 8.17E-05 S12 -4.21E-03 3.06E-03 -1.12E-03 2.21E-04 3.11E-04 -2.06E-04 1.12E-05 S13 -4.44E-03 -2.07E-03 2.35E-03 -7.96E-04 -2.61E-04 3.52E-04 -9.84E-05 S14 2.50E-03 -7.46E-04 -2.92E-04 -7.39E-04 4.13E-04 -6.32E-06 -1.68E-05

[0090] Table 4-2

[0091] Figure 4A The on-axis chromatic aberration curve of the imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The distortion curve of the imaging lens of Example 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 4C The magnification chromatic aberration curve of the imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4A to 4C It can be seen that the imaging lens given in Example 2 can achieve good imaging quality.

[0092] Example 3

[0093] The following is for reference Figures 5 to 6C An imaging lens according to Embodiment 3 of this application is described. Figure 5 A schematic diagram of the imaging lens according to Embodiment 3 of this application is shown.

[0094] like Figure 5As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 8.62 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.84 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 6.93 mm, the maximum semi-field of view (Semi-FOV) is 39.57°, and the aperture number Fno is 1.90.

[0095] Table 5 shows the basic parameters of the imaging lens of Example 3, where the units for radius of curvature, thickness and effective focal length are millimeters (mm). Tables 6-1 and 6-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 3, where each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0096]

[0097] Table 5

[0098]

[0099]

[0100] Table 6-1

[0101] Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.53E-05 -1.94E-05 -5.38E-06 1.34E-05 1.99E-05 -7.28E-06 -1.63E-06 S2 5.14E-05 -5.58E-05 -4.34E-06 -2.48E-05 2.58E-05 1.17E-05 -8.08E-06 S3 9.57E-05 -5.62E-05 5.36E-05 -3.47E-05 1.85E-05 -6.20E-06 7.57E-07 S4 4.19E-05 -2.56E-05 6.27E-06 -2.22E-05 4.83E-06 4.07E-06 -9.63E-07 S5 -4.78E-05 -2.67E-05 -7.95E-06 5.92E-06 4.59E-06 -2.04E-06 1.77E-07 S6 -4.16E-05 -3.05E-05 8.33E-06 2.05E-06 6.77E-06 -5.13E-06 9.42E-07 S7 -7.44E-05 -6.65E-05 -1.16E-05 1.73E-06 1.38E-05 -2.25E-06 -6.23E-07 S8 2.92E-04 1.39E-05 1.73E-05 -4.25E-05 -4.09E-05 -1.72E-06 2.36E-06 S9 -7.48E-03 3.01E-03 -2.44E-03 1.67E-03 -1.56E-03 6.59E-04 -1.23E-03 S10 5.76E-03 -1.15E-03 7.82E-04 -8.10E-04 2.76E-04 -7.68E-05 -7.40E-06 S11 2.69E-03 1.24E-03 -1.99E-05 4.23E-05 5.43E-05 5.18E-05 -2.43E-05 S12 -7.58E-03 -1.22E-03 1.30E-03 2.39E-04 -3.89E-04 8.28E-05 7.43E-06 S13 4.58E-03 -3.85E-03 9.99E-04 7.55E-04 -5.75E-04 -3.97E-05 1.12E-04 S14 4.35E-03 -2.65E-03 -2.06E-04 -1.56E-03 1.43E-04 2.80E-04 2.40E-04

[0102] Table 6-2

[0103] Figure 6A The on-axis chromatic aberration curve of the imaging lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6BThe distortion curve of the imaging lens of Example 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6C The magnification chromatic aberration curve of the imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6A to 6C It can be seen that the imaging lens given in Example 3 can achieve good imaging quality.

[0104] Example 4

[0105] The following is for reference Figures 7 to 8C An imaging lens according to Embodiment 4 of this application is described. Figure 7 A schematic diagram of the imaging lens according to Embodiment 4 of this application is shown.

[0106] like Figure 7 As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has negative optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 8.62 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.73 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 6.93 mm, the maximum semi-field of view (Semi-FOV) is 39.47°, and the aperture number Fno is 1.85.

[0107] Table 7 shows the basic parameters of the imaging lens of Example 4, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0108]

[0109] Table 7

[0110] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.19E-02 -6.30E-03 -4.53E-03 -1.75E-03 -6.13E-04 -9.72E-05 -7.25E-05 S2 -5.25E-02 1.04E-03 -4.87E-03 7.78E-04 -8.84E-04 9.67E-07 -2.99E-04 S3 -1.83E-01 4.71E-02 2.36E-03 1.59E-03 -1.21E-03 -1.73E-04 -3.42E-04 S4 -2.67E-01 5.63E-02 1.00E-02 3.58E-03 2.84E-04 -8.99E-05 -2.58E-04 S5 -1.19E-01 5.50E-03 1.53E-02 3.44E-03 2.71E-04 -2.90E-04 -4.93E-05 S6 -2.09E-01 -9.84E-03 8.10E-03 2.87E-03 8.47E-04 -5.05E-05 -8.79E-05 S7 -2.66E-01 -5.00E-03 6.80E-03 3.10E-03 1.23E-03 -5.56E-06 -1.65E-04 S8 -6.57E-01 7.34E-02 1.73E-02 1.11E-02 3.52E-03 1.63E-03 -6.78E-05 S9 -3.74E-01 -2.83E-01 1.10E-01 -3.41E-02 5.35E-02 -1.61E-02 3.30E-03 S10 -2.96E+00 5.14E-01 -1.23E-01 5.33E-02 -3.23E-03 6.12E-04 -1.00E-02 S11 -1.35E+00 -6.07E-03 9.59E-03 6.49E-02 -2.04E-02 -8.15E-04 8.73E-03 S12 2.03E+00 -5.42E-01 3.86E-02 3.40E-02 -2.50E-02 -6.67E-03 1.77E-02 S13 8.58E-01 4.91E-01 -3.41E-01 1.32E-01 2.73E-03 -1.24E-02 1.47E-03 S14 -6.44E+00 8.75E-01 -4.09E-01 9.07E-02 -3.08E-02 3.30E-02 -7.07E-03

[0111] Table 8-1

[0112] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.87E-05 -1.59E-05 2.65E-05 1.64E-05 1.74E-05 -1.87E-05 2.93E-06 S2 2.68E-05 -8.25E-05 2.87E-05 1.03E-05 4.99E-05 -1.19E-05 -5.10E-06 S3 1.17E-04 -4.14E-05 6.27E-05 -3.23E-05 2.45E-05 -1.04E-05 1.26E-06 S4 -8.35E-05 -8.60E-05 -2.31E-07 9.36E-06 4.61E-05 2.17E-05 4.58E-06 S5 -4.19E-05 3.82E-05 3.26E-05 2.54E-05 -1.92E-05 -1.57E-05 -8.81E-06 S6 -1.51E-04 -5.06E-05 -1.12E-05 1.93E-05 2.86E-06 -4.85E-07 -7.06E-07 S7 -1.46E-04 -5.64E-05 -1.07E-05 1.02E-05 -3.59E-06 -1.43E-05 -1.31E-05 S8 2.30E-04 -9.27E-05 8.16E-07 -4.98E-05 -4.37E-05 -1.57E-05 -2.03E-05 S9 -9.30E-03 4.07E-03 -3.11E-03 2.01E-03 -1.93E-03 7.63E-04 -1.50E-03 S10 7.04E-03 -2.03E-03 -7.10E-05 -2.85E-04 4.54E-04 -2.18E-04 1.35E-05 S11 5.84E-03 -4.46E-03 -3.57E-03 -2.90E-04 6.86E-04 2.72E-04 -5.50E-06 S12 3.62E-03 -1.38E-03 -9.53E-05 -2.85E-05 -4.09E-04 -2.23E-05 2.38E-05 S13 2.29E-03 -2.88E-03 3.04E-04 5.57E-04 8.09E-05 -1.04E-04 3.07E-06 S14 4.66E-03 -5.52E-04 8.14E-04 -1.52E-03 -2.54E-04 -6.00E-06 9.60E-05

[0113] Table 8-2

[0114] Figure 8A The on-axis chromatic aberration curve of the imaging lens of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 8B The distortion curve of the imaging lens of Example 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 8C The magnification chromatic aberration curve of the imaging lens of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 8A to 8C It can be seen that the imaging lens given in Example 4 can achieve good imaging quality.

[0115] Example 5

[0116] The following is for reference Figures 9 to 10C An imaging lens according to Embodiment 5 of this application is described. Figure 9 A schematic diagram of the imaging lens according to Embodiment 5 of this application is shown.

[0117] like Figure 9As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has negative optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 8.68 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.68 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 6.93 mm, the maximum semi-field of view (Semi-FOV) is 39.39°, and the aperture number Fno is 1.88.

[0118] Table 9 shows the basic parameters of the imaging lens of Example 5, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 10-1 and 10-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0119]

[0120] Table 9

[0121] Face number A4 A6 A8 A10 A12 A14 A16 S1 5.59E-03 -6.00E-03 -3.37E-03 -1.51E-03 -5.62E-04 -2.01E-04 -8.40E-05 S2 -8.23E-02 3.28E-03 -3.95E-03 -4.34E-04 -3.64E-04 -2.13E-04 -2.42E-05 S3 -1.51E-01 4.08E-02 5.80E-04 4.98E-04 -4.36E-04 -1.58E-04 -9.29E-05 S4 -2.99E-01 4.54E-02 4.96E-03 3.10E-03 4.36E-04 6.49E-05 -9.19E-05 S5 -1.16E-01 -6.27E-03 7.82E-03 3.50E-03 7.59E-04 -1.01E-04 -4.02E-05 S6 -2.00E-01 -3.41E-03 2.50E-03 2.07E-03 4.84E-04 -8.71E-05 -5.65E-05 S7 -2.97E-01 -3.13E-04 1.90E-03 2.26E-03 1.48E-03 4.16E-04 4.03E-05 S8 -6.43E-01 5.89E-02 6.74E-04 9.48E-03 2.70E-03 1.68E-03 -1.22E-05 S9 -3.55E-01 -2.53E-01 7.92E-02 -3.75E-02 4.84E-02 -1.33E-02 5.66E-03 S10 -2.80E+00 4.02E-01 -1.12E-01 2.88E-02 -3.82E-03 7.12E-03 -1.02E-02 S11 -1.30E+00 -1.17E-01 -2.95E-03 7.83E-02 -2.67E-02 -9.33E-03 9.53E-03 S12 2.05E+00 -4.47E-01 4.38E-02 6.17E-02 -3.78E-02 4.27E-03 2.91E-02 S13 1.20E+00 5.15E-01 -3.48E-01 1.33E-01 2.69E-03 -1.29E-02 6.77E-03 S14 -6.23E+00 9.10E-01 -3.26E-01 9.09E-02 -3.33E-02 2.59E-02 1.52E-03

[0122] Table 10-1

[0123]

[0124]

[0125] Table 10-2

[0126] Figure 10A The on-axis chromatic aberration curve of the imaging lens of Embodiment 5 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 10BThe distortion curve of the imaging lens of Example 5 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 10C The magnification chromatic aberration curve of the imaging lens of Embodiment 5 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 10A to 10C It can be seen that the imaging lens given in Example 5 can achieve good imaging quality.

[0127] Example 6

[0128] The following is for reference Figures 11 to 12C An imaging lens according to Embodiment 6 of this application is described. Figure 11 A schematic diagram of the imaging lens according to Embodiment 6 of this application is shown.

[0129] like Figure 11 As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has negative optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 8.22 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 10.84 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 6.20 mm, the maximum semi-field of view (Semi-FOV) is 37.20°, and the aperture number Fno is 1.89.

[0130] Table 11 shows the basic parameters of the imaging lens of Example 6, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 12-1 and 12-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0131]

[0132] Table 11

[0133] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.45E-02 3.35E-03 -3.09E-03 -8.99E-04 4.65E-04 2.52E-04 -1.33E-04 S2 -2.41E-01 3.50E-02 -8.83E-03 1.70E-03 -1.43E-03 4.51E-04 -7.70E-05 S3 -2.45E-01 7.04E-02 -4.42E-03 5.18E-03 -3.61E-03 1.43E-03 -7.75E-04 S4 -1.97E-01 4.61E-02 8.80E-03 5.45E-03 -5.52E-04 1.02E-03 7.51E-06 S5 -2.85E-01 2.37E-02 -2.31E-04 3.65E-03 2.95E-04 8.23E-04 1.07E-04 S6 -3.34E-02 -2.10E-02 1.64E-02 -1.84E-03 2.44E-03 -7.35E-04 1.80E-04 S7 -2.72E-01 1.64E-02 1.38E-02 8.07E-03 2.50E-04 -6.69E-04 -9.80E-04 S8 -5.16E-01 2.44E-02 1.65E-02 1.34E-02 4.16E-03 1.72E-03 -4.01E-04 S9 -3.75E-01 -2.51E-01 5.88E-02 -2.03E-02 3.47E-02 -7.37E-03 4.89E-03 S10 -3.05E+00 4.87E-01 -1.08E-01 3.76E-02 -8.82E-03 9.44E-03 -8.16E-03 S11 -1.62E+00 -1.62E-01 1.49E-01 2.87E-02 -2.25E-02 -4.42E-03 -9.53E-04 S12 1.91E+00 -4.50E-01 2.41E-01 -6.40E-02 -3.21E-03 6.90E-03 -1.84E-03 S13 1.07E+00 5.84E-01 -3.50E-01 1.30E-01 -8.26E-03 -7.64E-03 8.96E-03 S14 -6.29E+00 1.05E+00 -4.10E-01 8.00E-02 -4.64E-02 3.10E-02 -2.97E-03

[0134] Table 12-1

[0135]

[0136]

[0137] Table 12-2

[0138] Figure 12A The on-axis chromatic aberration curve of the imaging lens of Embodiment 6 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 12B The distortion curve of the imaging lens of Example 6 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 12C The magnification 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. According to Figures 12A to 12C It can be seen that the imaging lens given in Example 6 can achieve good imaging quality.

[0139] Example 7

[0140] The following is for reference Figures 13 to 14C An imaging lens according to Embodiment 7 of this application is described. Figure 13 A schematic diagram of the imaging lens according to Embodiment 7 of this application is shown.

[0141] like Figure 13As shown, the imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17. In this example, the effective focal length f of the imaging lens is 6.78 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens is 8.93 mm, half the diagonal length of the effective pixel area ImgH of the imaging lens is 5.80 mm, the maximum semi-field of view (Semi-FOV) is 40.11°, and the aperture number Fno is 1.89.

[0142] Table 13 shows the basic parameters of the imaging lens of Example 7, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 14-1 and 14-2 show the higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0143]

[0144]

[0145] Table 13

[0146] Face number A4 A6 A8 A10 A12 A14 A16 S1 5.28E-02 -2.18E-03 6.26E-04 -5.06E-04 2.59E-04 -2.89E-04 1.09E-04 S2 -1.46E-01 2.14E-02 -9.41E-03 4.30E-03 -2.62E-03 5.68E-05 2.08E-04 S3 -1.49E-01 5.44E-02 -2.30E-02 1.18E-02 -6.80E-03 2.38E-03 -7.73E-04 S4 -1.65E-01 4.86E-02 -2.08E-02 1.12E-02 -5.69E-03 2.42E-03 -8.74E-04 S5 -7.90E-02 -2.01E-02 6.38E-03 -1.01E-03 3.38E-04 -6.56E-04 3.92E-04 S6 -1.99E-02 -5.77E-03 2.41E-03 -5.09E-03 -1.65E-03 -1.77E-03 -5.91E-04 S7 -2.34E-01 -1.35E-02 -7.63E-03 -4.49E-03 -2.94E-03 -2.14E-03 -1.58E-03 S8 -2.20E-01 -5.81E-03 5.06E-03 1.89E-03 2.22E-03 2.08E-03 8.91E-04 S9 -3.51E-01 2.89E-02 -4.48E-04 -2.49E-03 5.76E-04 -1.65E-04 -8.68E-04 S10 -7.06E-01 4.16E-02 2.83E-03 -1.86E-04 8.49E-04 -4.58E-04 -9.19E-04 S11 -5.99E-01 -7.45E-02 5.57E-03 1.07E-04 -4.24E-04 1.50E-04 -6.67E-04 S12 6.78E-01 -1.25E-01 3.89E-02 -1.34E-02 3.34E-03 -8.46E-04 1.04E-03 S13 -6.46E-01 8.90E-02 1.19E-02 -1.04E-02 5.70E-03 -3.25E-03 1.89E-03 S14 -2.74E+00 3.96E-01 -1.12E-01 3.03E-02 -7.99E-03 -1.15E-04 1.07E-03

[0147] Table 14-1

[0148]

[0149]

[0150] Table 14-2

[0151] Figure 14AThe on-axis chromatic aberration curve of the imaging lens of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 14B The distortion curve of the imaging lens of Example 7 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 14C The magnification chromatic aberration curve of the imaging lens of Embodiment 7 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 14A to 14C It can be seen that the imaging lens given in Example 7 can achieve good imaging quality.

[0152] In summary, Examples 1 to 7 satisfy the relationships shown in Table 15.

[0153] Conditional / Example 1 2 3 4 5 6 7 CT4 / T45 3.94 4.61 8.74 4.59 3.02 2.62 2.84 ImgH / BFL 2.45 2.45 2.43 2.46 2.47 2.20 2.09 TTL / ImgH 1.55 1.57 1.56 1.55 1.54 1.75 1.54 (CT4+CT5+CT6) / CT7 9.92 12.12 11.91 12.06 10.85 11.94 5.31 f / tan(Semi-FOV) 10.75 10.27 10.42 10.46 10.57 10.83 8.05 f / (f6+|f7|) 0.97 1.05 1.01 1.01 0.98 0.96 0.96 f6 / (R11-R12) 0.47 0.43 0.47 0.45 0.45 0.46 0.29 f7 / (R13+R14) 1.29 1.15 1.55 1.71 1.97 1.24 2.35 (R13+R14) / (R13-R14) 0.32 0.32 0.27 0.24 0.22 0.32 0.16 (R1+R4) / (CT1+CT2) 6.04 7.29 5.29 5.30 5.19 8.11 6.97 (DT41+DT42) / DT51 1.49 1.61 1.56 1.53 1.48 1.58 1.73 (ET4+ET6) / ET7 6.08 6.66 3.40 3.74 4.05 2.59 0.59 (SAG71-SAG72) / (SAG71+SAG72) -0.01 0.02 0.09 0.07 0.05 0.45 0.45

[0154] Table 15

[0155] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0156] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging lens characterized in that, sequentially from the object side to the image side along the optical axis include: a first lens with positive refractive power, an object side surface of which is a convex surface and an image side surface of which is a concave surface; a second lens, an object side surface of which is a convex surface and an image side surface of which is a concave surface; a third lens, an object side surface of which is a convex surface and an image side surface of which is a concave surface; a fourth lens, an image side surface of which is a convex surface; a fifth lens, an image side surface of which is a concave surface; a sixth lens with positive refractive power, an object side surface of which is a convex surface and an image side surface of which is a convex surface; and a seventh lens with negative refractive power, an object side surface of which is a concave surface and an image side surface of which is a concave surface, wherein, at least one of the second lens and the third lens has negative refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power; or the second lens, the fourth lens and the fifth lens all have negative refractive power, and the third lens has positive refractive power; or the second lens and the fourth lens both have negative refractive power, and the third lens and the fifth lens both have positive refractive power; a central thickness CT4 of the fourth lens on the optical axis, an air separation T45 of the fourth lens and the fifth lens on the optical axis, a half of a diagonal line length ImgH of an effective pixel area of the imaging lens, and a distance BFL from the image side surface of the seventh lens to an imaging surface of the imaging lens on the optical axis satisfy: 2.62≤CT4 / T45≤8.74 and 2.09≤ImgH / BFL≤2.47; a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis, and a central thickness CT7 of the seventh lens on the optical axis satisfy: 5.31≤(CT4+CT5+CT6) / CT7≤12.12; an effective focal length f of the imaging lens, an effective focal length f6 of the sixth lens, and an effective focal length f7 of the seventh lens satisfy: 0.96≤f / (f6+|f7|)≤1.05; the effective focal length f7 of the seventh lens, a curvature radius R13 of the object side surface of the seventh lens, and a curvature radius R14 of the image side surface of the seventh lens satisfy: 1.15≤f7 / (R13+R14)≤2.35; a number of lenses with refractive power in the imaging lens is seven.

2. The imaging lens according to claim 1, wherein, a distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, and the half of the diagonal line length ImgH of the effective pixel area of the imaging lens satisfy: 1.54≤TTL / ImgH≤1.

75.

3. The imaging lens according to claim 1, wherein, the effective focal length f of the imaging lens and a half Semi-FOV of the maximum field of view angle of the imaging lens satisfy: 8.05mm≤f / tan(Semi-FOV)≤10.83mm.

4. The imaging lens according to claim 1, wherein, the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.29≤f6 / (R11-R12)≤0.

47.

5. The imaging lens according to claim 1, wherein, A radius of curvature R13 of an object side surface of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 0.16 ≤ (R13+R14) / (R13-R14) ≤ 0.

32.

6. The imaging lens according to any one of claims 1 to 5, wherein, A radius of curvature R1 of an object side surface of the first lens, a radius of curvature R4 of an image side surface of the second lens, a central thickness CT1 of the first lens on the optical axis, and a central thickness CT2 of the second lens on the optical axis satisfy: 5.19 ≤ (R1+R4) / (CT1+CT2) ≤ 8.

11.

7. The imaging lens according to any one of claims 1 to 5, wherein, An effective half radius DT41 of an object side surface of the fourth lens, an effective half radius DT42 of an image side surface of the fourth lens, and an effective half hole radius DT51 of an object side surface of the fifth lens satisfy: 1.48 ≤ (DT41+DT42) / DT51 ≤ 1.

73.

8. The imaging lens according to any one of claims 1 to 5, wherein, An edge thickness ET4 at a maximum effective half radius of the fourth lens, an edge thickness ET6 at a maximum effective half radius of the sixth lens, and an edge thickness ET7 at a maximum effective half radius of the seventh lens satisfy: 0.59 ≤ (ET4+ET6) / ET7 ≤ 6.

66.

9. The imaging lens according to any one of claims 1 to 5, wherein, A distance SAG71 on the optical axis between an intersection of the object side surface of the seventh lens and the optical axis and an effective half radius vertex of the object side surface of the seventh lens, and a distance SAG72 on the optical axis between an intersection of the image side surface of the seventh lens and the optical axis and an effective half radius vertex of the image side surface of the seventh lens satisfy: -0.01 ≤ (SAG71-SAG72) / (SAG71+SAG72) ≤ 0.45.

Images