Imaging Lenses

Abstract

The present application discloses an imaging lens, which comprises, in order from the object side to the image side along the optical axis: a movable aperture; a first lens with positive optical power; a second lens with optical power; a third lens with optical power; a fourth lens with positive optical power; and a fifth lens with optical power; an effective focal length f1 of the first lens and an effective focal length f4 of the fourth lens satisfy: 1.0<f4 / f1<2.3; and a distance TSmin from the movable aperture to the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging surface of the imaging lens, a distance TSmax from the movable aperture to the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging surface of the imaging lens, and a center thickness CT1 of the first lens on the optical axis satisfy: 1.0<(|TSmin|+|TSmax|) / CT1<1.5.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an imaging lens. Background Art

[0002] In recent years, with the rapid development of portable electronic products such as smartphones, the imaging lenses used in portable electronic products such as smartphones are also developing rapidly, and users have more and more requirements for imaging lenses used in portable electronic products such as smartphones. At the same time, imaging lenses with ultra-thin, telephoto, super telephoto, periscope telephoto and wide-angle characteristics are gradually appearing in the eyes of users.

[0003] As users' demands for the functions of imaging lenses for portable electronic products such as smartphones continue to increase, how to achieve a larger depth of field when shooting portraits while meeting the requirements of miniaturization and compact structure of the lenses has become a common goal pursued by many users. Summary of the invention

[0004] The present application provides an imaging lens, which includes, in order from the object side to the image side along the optical axis: a movable aperture; a first lens with positive optical power; a second lens with optical power; a third lens with optical power; a fourth lens with positive optical power; and a fifth lens with optical power; the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens can satisfy: 1.0<f4 / f1<2.3; and the distance TSmin from the movable aperture to the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens, the distance TSmax from the movable aperture to the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens, and the center thickness CT1 of the first lens on the optical axis can satisfy: 1.0<(|TSmin|+|TSmax|) / CT1<1.5.

[0005] In one embodiment, there is at least one aspherical mirror surface from the object side surface of the first lens to the image side surface of the fifth lens.

[0006] In one embodiment, a distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis, a distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the fourth lens on the optical axis, and the maximum effective radius DT42 of the image side surface of the fourth lens may satisfy: 0.7<(SAG41+SAG42) / DT42<1.0.

[0007] In one embodiment, a distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis and a distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the fourth lens on the optical axis may satisfy: 0.8<SAG42 / SAG41≤1.3.

[0008] In one embodiment, a distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius vertex of the image side surface of the second lens on the optical axis and a center thickness CT2 of the second lens on the optical axis may satisfy: 1.0<SAG22 / CT2<1.5.

[0009] In one embodiment, the distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface of the fourth lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis may satisfy: 1.0<(T45-SAG41) / CT4<1.5.

[0010] In one embodiment, the effective focal length f4 of the fourth lens, the curvature radius R7 of the object-side surface of the fourth lens, and the curvature radius R8 of the image-side surface of the fourth lens may satisfy: 1.0<f4 / (R7+R8)<4.0.

[0011] In one embodiment, the total effective focal length f of the imaging lens, the curvature radius R5 of the object-side surface of the third lens, and the curvature radius R6 of the image-side surface of the third lens may satisfy: 2.0<f / R5+f / R6<3.5.

[0012] In one embodiment, a center thickness CT3 of the third lens on the optical axis and a center thickness CT1 of the first lens on the optical axis may satisfy: 0.5<CT3 / CT1<1.0.

[0013] In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 1.0<DT11 / DT52<1.3.

[0014] In one embodiment, the maximum effective radius DT42 of the image-side surface of the fourth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 0.9<DT42 / DT52<1.1.

[0015] In one embodiment, the maximum entrance pupil diameter EPDmax of the imaging lens and half the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging lens may satisfy: EPDmax / ImgH<2.5.

[0016] On the other hand, the present application provides an imaging lens. The imaging lens includes, in order from the object side to the image side along the optical axis: a movable aperture; a first lens with positive focal power; a second lens with focal power; a third lens with focal power; a fourth lens with positive focal power; and a fifth lens with focal power; a distance TSmin from the object side of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging surface of the imaging lens, a distance TSmax from the object side of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging surface of the imaging lens, and a center of the first lens on the optical axis. The thickness CT1 may satisfy: 1.0<(|TSmin|+|TSmax|) / CT1<1.5; and the distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis, the distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the fourth lens on the optical axis, and the maximum effective radius DT42 of the image side surface of the fourth lens may satisfy: 0.7<(SAG41+SAG42) / DT42<1.0.

[0017] The present application adopts multiple (for example, five) lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned imaging lens has at least one beneficial effect of miniaturization, large depth of field, high imaging quality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 A schematic structural diagram of an imaging lens according to Embodiment 1 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging surface of the imaging lens is the smallest;

[0020] Figure 2 A schematic structural diagram of an imaging lens according to Embodiment 1 of the present application is shown, wherein the movable aperture is at a position at a maximum distance from an imaging plane of the imaging lens;

[0021] FIG. 3A to FIG. 3C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 1 are respectively shown when the distance between the movable aperture stop and the imaging plane of the imaging lens on the optical axis is the smallest;

[0022] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 1 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest;

[0023] Figure 5 A schematic structural diagram of an imaging lens according to Embodiment 2 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging surface of the imaging lens is the smallest;

[0024] Figure 6 A schematic structural diagram of an imaging lens according to Embodiment 2 of the present application is shown, wherein the movable aperture is at a position at a maximum distance from an imaging plane of the imaging lens;

[0025] FIG. 7A to FIG. 7C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 2 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the smallest;

[0026] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 2 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest;

[0027] Fig. 9 A schematic structural diagram of an imaging lens according to Embodiment 3 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging plane of the imaging lens is the smallest;

[0028] Fig.10 A schematic structural diagram of an imaging lens according to Embodiment 3 of the present application is shown, wherein the movable aperture is at a position at a maximum distance from an imaging plane of the imaging lens;

[0029] FIG. 11A to FIG. 11C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 3 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the smallest;

[0030] FIG. 12A to FIG. 12C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 3 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest;

[0031] Fig.13 A schematic structural diagram of an imaging lens according to Embodiment 4 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging surface of the imaging lens is the smallest;

[0032] Fig.14 A schematic structural diagram of an imaging lens according to Embodiment 4 of the present application is shown, wherein the movable aperture is at a position at which the distance from the imaging plane of the imaging lens is the largest;

[0033] FIG. 15A to FIG. 15C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 4 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the smallest;

[0034] FIG. 16A to FIG. 16C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 4 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest;

[0035] Fig.17 A schematic structural diagram of an imaging lens according to Embodiment 5 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging plane of the imaging lens is the smallest;

[0036] Fig.18 A schematic structural diagram of an imaging lens according to Embodiment 5 of the present application is shown, wherein the movable aperture is at a position at which the distance from the imaging plane of the imaging lens is the largest;

[0037] FIG. 19A to FIG. 19C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 5 are respectively shown when the distance between the movable aperture stop and the imaging plane of the imaging lens on the optical axis is the smallest;

[0038] FIG. 20A to FIG. 20C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 5 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest;

[0039] Fig.21 A schematic structural diagram of an imaging lens according to Embodiment 6 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging plane of the imaging lens is the smallest;

[0040] Fig. 22 A schematic structural diagram of an imaging lens according to Embodiment 6 of the present application is shown, wherein the movable aperture is at a position at a maximum distance from an imaging plane of the imaging lens;

[0041] FIG. 23A to FIG. 23C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 6 are respectively shown when the distance between the movable aperture stop and the imaging plane of the imaging lens on the optical axis is the smallest;

[0042] FIG. 24A to FIG. 24C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 6 are respectively shown when the distance between the movable aperture stop and the imaging plane of the imaging lens on the optical axis is the largest;

[0043] Fig.25 A schematic structural diagram of an imaging lens according to Embodiment 7 of the present application is shown, wherein the movable aperture is at a position where the distance from the imaging surface of the imaging lens is the smallest;

[0044] Fig.26A schematic structural diagram of an imaging lens according to Embodiment 7 of the present application is shown, wherein the movable aperture is at a position at a maximum distance from an imaging plane of the imaging lens;

[0045] FIG. 27A to FIG. 27C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 7 are respectively shown when the distance between the movable aperture stop and the imaging plane of the imaging lens on the optical axis is the smallest; and

[0046] FIG. 28A to FIG. 28C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of Example 7 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is the largest. DETAILED DESCRIPTION

[0047] In order to better understand the present application, a more detailed description will be made of various aspects of the present application 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 are not intended to 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.

[0048] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0049] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0050] In this article, 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 is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0051] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0052] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] The features, principles and other aspects of the present application are described in detail below.

[0055] The imaging lens according to the exemplary embodiment of the present application may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The five lenses are arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the fifth lens may have a spacing distance between them.

[0056] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have positive optical power or negative optical power; the third lens may have positive optical power or negative optical power; the fourth lens may have positive optical power; and the fifth lens may have positive optical power or negative optical power.

[0057] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<f4 / f1<2.3, wherein f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens. More specifically, f1 and f4 may further satisfy: 1.2<f4 / f1<2.2. Satisfying 1.0<f4 / f1<2.3 can effectively ensure that the system has a longer total effective focal length.

[0058] In an exemplary embodiment, the imaging lens according to the present application further includes a movable aperture provided between the object side and the first lens. Figure 1 and Figure 2 As shown in FIG. 1 , the movable aperture can be slidably arranged along the optical axis. Specifically, the movable aperture can slide between a position where the distance from the imaging surface of the imaging lens is the smallest and b position where the distance from the imaging surface of the imaging lens is the largest. Specifically, the movable aperture can be moved to Figure 1 The movable aperture can also be moved to the position shown in Figure 1. Figure 2 The maximum distance b from the imaging surface of the imaging lens is shown. When the imaging lens has a long total effective focal length, the movable aperture has a larger range of movement, which can make the aperture value of the system have a larger range of variation.

[0059] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<(|TSmin|+|TSmax|) / CT1<1.5, wherein TSmin is the distance from the movable aperture to the object side of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens, TSmax is the distance from the movable aperture to the object side of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens, and CT1 is the center thickness of the first lens on the optical axis. More specifically, TSmin, TSmax and CT1 may further satisfy: 1.0<(|TSmin|+|TSmax|) / CT1<1.4. Satisfying 1.0<(|TSmin|+|TSmax|) / CT1<1.5, the position of the movable aperture can be controlled within a reasonable range, and under the condition that the total effective focal length of the imaging lens is certain, the aperture value of the imaging lens can be switched between different values ​​to meet the requirement of a large depth of field when shooting portraits.

[0060] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.7<(SAG41+SAG42) / DT42<1.0, wherein SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface of the fourth lens on the optical axis, SAG42 is the distance from the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens on the optical axis, and DT42 is the maximum effective radius of the image side surface of the fourth lens. Satisfying 0.7<(SAG41+SAG42) / DT42<1.0 can effectively constrain the shape of the fourth lens, reduce the risk of ghosting, reduce the difficulty of processing, and compensate for the spherical aberration of the imaging lens.

[0061] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.8<SAG42 / SAG41≤1.3, wherein SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface of the fourth lens on the optical axis, and SAG42 is the distance from the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens on the optical axis. Satisfying 0.8<SAG42 / SAG41≤1.3 can prevent the fourth lens from being too curved, reduce the difficulty of processing, and compensate for the spherical aberration of the imaging lens.

[0062] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<SAG22 / CT2<1.5, where SAG22 is the distance from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius vertex of the image side surface of the second lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. Satisfying 1.0<SAG22 / CT2<1.5 can effectively improve the field curvature sensitivity problem of the entire lens and reduce the astigmatism and coma contribution of the second lens in the entire system.

[0063] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<(T45-SAG41) / CT4<1.5, wherein SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface of the fourth lens on the optical axis, T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. Satisfying 1.0<(T45-SAG41) / CT4<1.5 can effectively reduce the risk of ghost images caused by the fourth lens and the fifth lens, and reduce the size of the imaging lens to achieve miniaturization of the lens.

[0064] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<f4 / (R7+R8)<4.0, wherein f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens. More specifically, f4, R7, and R8 may further satisfy: 2.4<f4 / (R7+R8)<4.0. Satisfying 1.0<f4 / (R7+R8)<4.0 can control the deflection angle of the edge field of view at the fourth lens, which can effectively reduce the sensitivity of the system.

[0065] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 2.0<f / R5+f / R6<3.5, wherein f is the total effective focal length of the imaging lens, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens. More specifically, f, R5, and R6 may further satisfy: 2.1<f / R5+f / R6<3.2. Satisfying 2.0<f / R5+f / R6<3.5 can better balance the spherical aberration generated by the front and rear lenses, thereby adjusting the spherical aberration of the system and reducing the aberration of the on-axis field of view.

[0066] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.5<CT3 / CT1<1.0, where CT3 is the center thickness of the third lens on the optical axis, and CT1 is the center thickness of the first lens on the optical axis. Satisfying 0.5<CT3 / CT1<1.0 can control the distortion contribution of the first lens and the third lens within a reasonable range, so that the final distortion amount of each field of view can be controlled within a smaller numerical range, avoiding the need for later software debugging.

[0067] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0<DT11 / DT52<1.3, wherein DT11 is the maximum effective radius of the object side of the first lens, and DT52 is the maximum effective radius of the image side of the fifth lens. More specifically, DT11 and DT52 may further satisfy: 1.1<DT11 / DT52<1.3. Satisfying 1.0<DT11 / DT52<1.3 can reduce the size of the lens, realize miniaturization of the lens, and improve the resolution.

[0068] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 0.9<DT42 / DT52<1.1, wherein DT42 is the maximum effective radius of the image side of the fourth lens, and DT52 is the maximum effective radius of the image side of the fifth lens. Satisfying 0.9<DT42 / DT52<1.1 can reduce the size of the lens, realize miniaturization of the lens, reduce the difficulty of processing, and improve the resolution.

[0069] In an exemplary embodiment, the imaging lens according to the present application may satisfy: EPDmax / ImgH<2.5, where EPDmax is the maximum entrance pupil diameter of the imaging lens, that is, the entrance pupil diameter when the movable aperture is at the minimum distance from the imaging surface of the imaging lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens. Meeting EPDmax / ImgH<2.5 is conducive to moving the aperture within a reasonable range under the premise that the aperture is movable, and at the same time can ensure that the aperture value of the system is large.

[0070] In an exemplary embodiment, the imaging lens according to the present application may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The imaging lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the five lenses described above. By reasonably allocating the optical focal length, surface shape, center thickness of each lens, and axial spacing between each lens, the volume of the imaging lens can be effectively reduced and the processability of the imaging lens can be improved, making the imaging lens more conducive to production and processing and suitable for portable electronic products. The imaging lens configured as above has the characteristics of miniaturization, compact structure, large depth of field, good imaging quality, etc., which can well meet the use requirements of various portable electronic products in camera scenes.

[0071] In the 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 mirror surfaces from the object side of the first lens to the image side of the fifth lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical mirror surfaces.

[0072] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the imaging lens is not limited to including five lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0073] Specific embodiments of the imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0074] Example 1

[0075] The following reference Figures 1 to 4C An imaging lens according to Embodiment 1 of the present application is described. Figure 1 and Figure 2 The structural schematic diagrams of the imaging lens according to Embodiment 1 of the present application are respectively shown when the movable aperture is at the minimum distance and the maximum distance from the imaging plane of the imaging lens.

[0076] like Figure 1 and Figure 2 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0077] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0078] Table 1 shows the basic parameters of the imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0079]

[0080] Table 1

[0081] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -0.8606 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.41, and the maximum field of view FOV of the imaging lens is 32.3°.

[0082] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0083]

[0084] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A that can be used for each aspheric mirror surface S1-S10 in Example 1 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0085] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.7269E-01 -3.7281E-02 -7.3817E-03 -1.2174E-03 -2.5327E-04 -6.6137E-05 -5.8607E-06 -7.7589E-06 4.4449E-08 S2 2.1972E-01 -6.8989E-02 1.6338E-02 -4.3500E-04 -7.6543E-04 1.4789E-03 -6.4586E-04 3.8259E-04 -1.4540E-04 S3 5.0607E-01 -3.0646E-02 1.7461E-02 -2.5592E-03 8.1362E-04 3.4001E-04 -2.2181E-04 7.3563E-05 1.7277E-06 S4 -2.2692E-02 -8.6355E-02 3.4166E-02 -4.6503E-02 1.1650E-02 -5.5444E-03 2.6931E-03 1.8273E-04 -2.9031E-05 S5 6.1662E-02 5.6598E-03 2.2034E-02 5.4274E-04 -1.7863E-03 2.8024E-04 -3.8362E-04 -7.0075E-05 -4.1012E-05 S6 -8.4437E-01 8.4819E-02 -4.9292E-03 6.3300E-03 -1.9195E-03 5.7066E-04 -4.3235E-04 -4.5571E-05 -5.1640E-05 S7 -3.3772E-01 -8.7459E-02 -2.3036E-02 -2.1886E-04 -2.0385E-03 -8.6787E-04 -2.1770E-04 -1.4951E-05 -1.4429E-05 S8 -4.5795E-01 -1.2311E-01 -1.1402E-02 7.2200E-04 -1.7127E-03 -2.4966E-04 2.5315E-04 6.1870E-05 -2.5668E-05 S9 -2.6325E-01 6.3868E-02 8.6768E-03 -1.2533E-03 -4.7030E-04 -1.8719E-04 9.0117E-06 4.5475E-05 -2.3952E-05 S10 -3.3379E-01 6.0520E-02 2.0340E-02 1.0488E-03 3.9613E-05 -6.4734E-04 -2.7023E-04 -1.0835E-04 -7.8031E-05

[0086] Table 2

[0087] Figure 3A and Figure 4A The axial chromatic aberration curves of the imaging lens of Example 1 when the distance from the movable aperture to the imaging surface of the imaging lens on the optical axis is minimum and maximum are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Figure 3B and Figure 4B The astigmatism curves of the imaging lens of Example 1 when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image curvature and the sagittal image curvature. Figure 3C and Figure 4C The distortion curves of the imaging lens of Example 1 when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 3A to FIG. 4C It can be seen that the imaging lens provided in Example 1 can achieve good imaging quality.

[0088] Example 2

[0089] The following reference Figures 5 to 8C An imaging lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 5 and Figure 6 The structural schematic diagrams of the imaging lens according to Embodiment 2 of the present application are respectively shown, in which the movable aperture is at the minimum distance and the maximum distance from the imaging surface of the imaging lens. Figure 5 and Figure 6As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0090] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0091] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -0.8178 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.41, and the maximum field of view FOV of the imaging lens is 32.0°.

[0092] Table 3 shows the basic parameters of the imaging lens of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0093]

[0094] Table 3

[0095] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.5956E-01 -4.4544E-02 -8.9406E-03 -1.4299E-03 -1.9806E-04 -8.3510E-06 -1.1364E-05 8.1685E-06 -2.3697E-05 S2 2.4567E-01 -7.9953E-02 1.0810E-02 -1.5953E-03 7.2407E-04 -2.0684E-04 1.2401E-05 1.1094E-05 1.3983E-05 S3 4.8256E-01 -2.6870E-02 1.8172E-02 6.9694E-04 4.3394E-04 4.5458E-04 2.5265E-04 2.5507E-04 5.9508E-05 S4 -1.1635E-03 -7.2657E-02 4.2729E-02 -4.5099E-02 1.7141E-02 -4.0520E-03 4.8634E-05 1.8438E-03 -6.3825E-04 S5 6.4243E-02 2.7257E-02 1.3262E-02 8.4665E-04 -2.5535E-03 2.4688E-04 -6.3653E-04 -6.4164E-05 1.7563E-05 S6 -8.3414E-01 9.1135E-02 -1.2404E-02 6.4140E-03 -3.3525E-03 8.0728E-04 -9.2004E-04 -7.2210E-05 -1.3425E-04 S7 -3.5997E-01 -7.5818E-02 -2.8439E-02 9.2460E-04 -2.3361E-03 -8.0850E-04 -3.0170E-04 -7.1818E-05 -2.3422E-05 S8 -4.8102E-01 -1.1501E-01 -1.2550E-02 2.9941E-03 -1.3669E-03 -3.2354E-04 1.7154E-04 4.5106E-05 -9.2225E-06 S9 -2.2902E-01 5.6778E-02 9.0680E-03 -4.8259E-04 -2.2853E-04 -1.4232E-04 -5.7450E-06 3.1007E-05 -1.0786E-05 S10 -1.5274E-01 1.4822E-01 1.4362E-01 -1.6739E-01 1.1853E-01 -6.4511E-02 2.7030E-02 -8.7091E-03 1.1121E-03

[0096] Table 4

[0097] Fig. 7A and Fig. 8A The axial chromatic aberration curves of the imaging lens of Example 2 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 7B and Figure 8B The astigmatism curves of the imaging lens of Example 2 when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image curvature and the sagittal image curvature. Figure 7C and Figure 8C The distortion curves of the imaging lens of Example 2 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. 7A to 8C It can be seen that the imaging lens provided in Example 2 can achieve good imaging quality.

[0098] Example 3

[0099] The following reference Figures 9 to 12C An imaging lens according to Embodiment 3 of the present application is described. Fig. 9 and Fig.10 The structural schematic diagrams of the imaging lens according to Embodiment 3 of the present application are respectively shown when the movable aperture is at the minimum distance and the maximum distance from the imaging plane of the imaging lens.

[0100] like Fig. 9 and Fig.10 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0101] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0102] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -0.8301 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.41, and the maximum field of view FOV of the imaging lens is 32.0°.

[0103] Table 5 shows the basic parameters of the imaging lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0104]

[0105]

[0106] Table 5

[0107] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.6714E-01 -3.8868E-02 -7.9575E-03 -1.3020E-03 -3.0298E-04 -7.7995E-05 -6.1708E-06 -1.2252E-05 -3.4475E-06 S2 2.3056E-01 -7.1813E-02 1.6878E-02 -1.7334E-03 2.6998E-06 1.1203E-03 -5.0902E-04 3.6129E-04 -1.9215E-04 S3 4.9052E-01 -2.4159E-02 1.6483E-02 -3.7000E-03 3.6869E-04 1.4504E-04 -2.0140E-04 1.6186E-04 9.0295E-05 S4 -4.4894E-04 -7.8864E-02 3.7021E-02 -4.6259E-02 1.1988E-02 -5.6935E-03 2.1631E-03 7.5806E-04 -4.1042E-04 S5 5.6218E-02 1.0803E-02 2.1139E-02 -1.0964E-03 -1.3183E-03 2.4729E-04 -5.7578E-04 -1.3686E-04 -3.0465E-05 S6 -8.3813E-01 9.1345E-02 -7.4025E-03 6.3538E-03 -1.4110E-03 8.8638E-04 -4.7860E-04 -3.3652E-05 -4.7637E-05 S7 -3.4593E-01 -8.7038E-02 -2.5020E-02 -3.1394E-04 -1.6701E-03 -8.6092E-04 -2.3249E-04 -3.9750E-05 4.8496E-06 S8 -4.7287E-01 -1.2121E-01 -9.9531E-03 1.7833E-03 -1.2523E-03 -4.1160E-04 2.2542E-04 7.5042E-05 2.5245E-06 S9 -2.8201E-01 5.8377E-02 9.9824E-03 -1.4678E-03 -4.8134E-04 -3.1943E-04 -7.0489E-05 2.5715E-05 -2.2469E-05 S10 1.7144E-01 6.8215E-02 1.3749E-01 -1.3821E-01 9.2988E-02 -5.1120E-02 2.1583E-02 -7.3427E-03 1.3774E-03

[0108] Table 6

[0109] Fig.11A and Fig. 12A The axial chromatic aberration curves of the imaging lens of Example 3 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 11B and Fig. 12B The astigmatism curves of the imaging lens of Example 3 when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image curvature and the sagittal image curvature. Fig. 11C and Fig. 12C The distortion curves of the imaging lens of Example 3 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 11A to FIG. 12C It can be seen that the imaging lens provided in Example 3 can achieve good imaging quality.

[0110] Example 4

[0111] The following reference Figures 13 to 16CAn imaging lens according to Embodiment 4 of the present application is described. Fig.13 and Fig.14 The structural schematic diagrams of the imaging lens according to Embodiment 4 of the present application are respectively shown, in which the movable aperture is at the minimum distance and the maximum distance from the imaging surface of the imaging lens. Fig.13 and Fig.14 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0112] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0113] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -1.1602 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.41, and the maximum field of view FOV of the imaging lens is 32.3°.

[0114] Table 7 shows the basic parameters of the imaging lens of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0115]

[0116] Table 7

[0117] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.0653E-01 -4.6637E-02 -1.2098E-02 -3.1159E-03 -7.6680E-04 -1.4858E-04 -3.7967E-05 -1.2715E-05 2.3214E-06 S2 1.8295E-01 -9.2423E-02 1.3483E-02 -2.7640E-03 -1.4806E-03 7.5095E-04 -4.7026E-04 3.6298E-04 -1.0445E-04 S3 3.4266E-01 -9.0123E-02 2.5689E-02 -1.5730E-02 1.0561E-03 -1.0493E-03 1.0257E-03 3.8278E-04 9.2138E-06 S4 4.2318E-02 -5.0426E-02 4.3690E-02 -5.3803E-02 1.9359E-02 -1.2015E-02 3.5401E-03 -6.8845E-04 3.2996E-04 S5 4.2318E-02 -5.0426E-02 4.3690E-02 -5.3803E-02 1.9359E-02 -1.2015E-02 3.5401E-03 -6.8845E-04 3.2996E-04 S6 -8.4712E-01 8.7246E-02 -1.9088E-02 6.1241E-03 -2.6065E-03 1.2143E-03 -3.5732E-04 1.2932E-04 -6.8306E-05 S7 -3.7250E-01 -7.7621E-02 -2.6801E-02 1.1669E-04 -2.7300E-03 -7.5547E-04 -2.7593E-04 -4.1303E-05 -1.7923E-05 S8 -4.7908E-01 -1.1111E-01 -9.2964E-03 1.8329E-03 -1.1757E-03 -1.2941E-04 1.6976E-04 1.5884E-05 -1.3201E-05 S9 -2.2683E-01 6.0745E-02 7.1225E-03 -8.1985E-04 -4.4923E-04 -1.9682E-04 3.6947E-06 2.0431E-05 -1.3150E-05 S10 -7.8600E-02 1.4073E-01 1.5020E-01 -1.6722E-01 1.1531E-01 -6.0273E-02 2.4648E-02 -7.8057E-03 1.4396E-03

[0118] Table 8

[0119] Fig.15A and Fig.16A The axial chromatic aberration curves of the imaging lens of Example 4 are respectively shown when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 15B and Fig. 16B The astigmatism curves of the imaging lens of Example 4 when the distance between the movable aperture and the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image curvature and the sagittal image curvature. Fig. 15C and Fig. 16C The distortion curves of the imaging lens of Example 4 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 15A to FIG. 16C It can be seen that the imaging lens provided in Example 4 can achieve good imaging quality.

[0120] Example 5

[0121] The following reference Figures 17 to 20C An imaging lens according to Embodiment 5 of the present application is described. Fig.17 and Fig.18 The structural schematic diagrams of the imaging lens according to Embodiment 5 of the present application are respectively shown, in which the movable aperture is at the minimum distance and the maximum distance from the imaging surface of the imaging lens. Fig.17 and Fig.18 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0122] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is concave, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has positive focal power, its object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has negative focal power, its object side surface S9 is concave, and the image side surface S10 is convex. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0123] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -1.0974 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.41, and the maximum field of view FOV of the imaging lens is 32.2°.

[0124] Table 9 shows the basic parameters of the imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0125]

[0126]

[0127] Table 9

[0128] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.3249E-01 -6.8212E-02 -1.6362E-02 -4.2578E-03 -9.7790E-04 -1.1639E-04 -3.8900E-05 7.8706E-06 1.3940E-06 S2 3.3121E-01 -9.4384E-02 9.3518E-03 -8.3129E-03 -1.7662E-03 -1.6930E-04 8.5101E-05 9.4946E-05 6.7932E-05 S3 4.2897E-01 -8.4017E-02 5.2027E-02 -3.1283E-02 4.0719E-03 -5.1309E-03 -7.5762E-04 -4.9758E-04 -5.7078E-05 S4 5.1302E-01 -6.8032E-02 4.6710E-02 -3.1016E-02 -2.8186E-03 -6.3182E-03 -2.2427E-03 -8.3156E-04 -2.7219E-04 S5 -7.6248E-02 1.3490E-02 2.9344E-02 8.5046E-04 -9.3664E-04 -1.4225E-03 -8.6702E-04 -2.8885E-04 -6.3434E-05 S6 -5.0720E-02 1.9999E-01 4.8916E-03 -4.4586E-02 5.7948E-02 -3.3844E-02 1.6826E-02 -5.0710E-03 1.0329E-03 S7 -3.8136E-01 -5.8363E-02 -3.4909E-03 2.7377E-04 -4.6300E-04 -3.1001E-04 -2.5937E-04 -7.8703E-05 1.0465E-06 S8 1.0110E+00 -7.1945E-02 8.6316E-03 -4.0187E-03 -3.2511E-03 1.7151E-03 -1.3059E-03 -1.9070E-04 9.5175E-04 S9 5.2432E-03 7.6425E-02 1.4182E-02 -9.4812E-03 2.2239E-03 -9.1961E-04 5.1856E-04 -8.7682E-05 -2.1896E-05 S10 -1.3391E-01 6.3031E-02 3.5254E-02 -1.1833E-02 3.5938E-03 -1.9630E-03 6.8162E-04 -8.4985E-05 4.9484E-05

[0129] Table 10

[0130] Fig.19A and Fig. 20A The axial chromatic aberration curves of the imaging lens of Example 5 are respectively shown when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.19B and Fig. 20B The astigmatism curves of the imaging lens of Example 5 when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.19C and Fig. 20C The distortion curves of the imaging lens of Example 5 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 19A to FIG. 20C It can be seen that the imaging lens provided in Example 5 can achieve good imaging quality.

[0131] Example 6

[0132] The following reference Figures 21 to 24CAn imaging lens according to Embodiment 6 of the present application is described. Fig.21 and Fig. 22 The structural schematic diagrams of the imaging lens according to Embodiment 6 of the present application are respectively shown, in which the movable aperture is at the minimum distance and the maximum distance from the imaging surface of the imaging lens. Fig.21 and Fig. 22 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0133] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0134] In this example, the total effective focal length f of the imaging lens is 9.08 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -1.1895 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.43, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.42, and the maximum field of view FOV of the imaging lens is 32.0°.

[0135] Table 11 shows the basic parameters of the imaging lens of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0136]

[0137] Table 11

[0138] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.0162E-01 -7.2667E-02 -1.9431E-02 -5.7168E-03 -1.3507E-03 -1.6335E-04 -2.9045E-05 2.1810E-05 2.1377E-06 S2 3.6140E-01 -1.1864E-01 5.3117E-03 -7.1841E-03 -3.3099E-03 -2.7581E-04 1.8119E-04 7.8411E-06 1.2342E-04 S3 3.0443E-01 -9.7921E-02 6.1262E-02 -4.0632E-02 1.1908E-03 -7.7805E-03 -1.2070E-03 -6.3279E-04 6.5636E-06 S4 4.7642E-01 -7.2327E-02 5.7333E-02 -3.3757E-02 -5.0978E-03 -8.7731E-03 -3.2404E-03 -1.2707E-03 -3.5231E-04 S5 -1.1194E-01 3.5476E-03 3.3491E-02 4.1087E-03 -1.7353E-03 -2.2052E-03 -1.0987E-03 -3.1089E-04 -4.9139E-05 S6 -3.8020E-02 2.1750E-01 -7.4831E-03 -5.0887E-02 6.7060E-02 -3.8615E-02 1.8300E-02 -5.3589E-03 1.0207E-03 S7 -3.8580E-01 -3.6152E-02 3.0200E-03 -2.5873E-03 -7.7836E-04 -1.6562E-04 -1.7245E-04 -4.7607E-05 1.3949E-05 S8 1.0180E+00 -8.7817E-02 4.5615E-02 -1.7428E-03 -1.1456E-02 8.6827E-04 1.4338E-03 -1.9153E-03 1.6777E-03 S9 3.8285E-02 6.5994E-02 2.3921E-02 -1.1187E-02 2.0048E-03 -1.0722E-03 6.9066E-04 -8.4076E-05 -5.5438E-05 S10 -6.8292E-02 4.3313E-02 4.7862E-02 -1.3847E-02 4.1026E-03 -2.4371E-03 7.8741E-04 -5.2526E-05 5.5315E-05

[0139] Table 12

[0140] Fig.23A and Fig.24A The axial chromatic aberration curves of the imaging lens of Example 6 are respectively shown when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 23B and Fig. 24B The astigmatism curves of the imaging lens of Example 6 when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.23C and Fig.24C The distortion curves of the imaging lens of Example 6 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 23A to FIG. 24C It can be seen that the imaging lens provided in Example 6 can achieve good imaging quality.

[0141] Example 7

[0142] The following reference Figures 25 to 28C An imaging lens according to Embodiment 7 of the present application is described. Fig.25 and Fig.26 Schematic diagrams of the structure of an imaging lens according to Embodiment 7 of the present application are respectively shown, in which the movable aperture is at the minimum distance from the imaging surface of the imaging lens and at the maximum distance from the imaging surface of the imaging lens. Fig.25 and Fig.26 As shown, the imaging lens includes, from the object side to the image side, a movable aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0143] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has positive focal power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0144] In this example, the total effective focal length f of the imaging lens is 9.11 mm, the distance TSmin from the object side surface of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens is -0.8502 mm, the distance TSmax from the object side surface of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens is 1.0000 mm, the aperture value FNOmin of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the minimum is 1.44, the aperture value FNOmax of the imaging lens when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is the maximum is 2.42, and the maximum field of view FOV of the imaging lens is 32.1°.

[0145] Table 13 shows the basic parameters of the imaging lens of Example 7, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0146]

[0147]

[0148] Table 13

[0149] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -3.2841E-01 -1.8656E-02 -7.6514E-03 -1.0000E-04 -3.6595E-04 -7.9083E-05 5.8037E-05 1.0050E-05 -2.4251E-05 S2 2.0122E-01 -1.8322E-02 3.1494E-02 1.9195E-02 6.0892E-03 8.7146E-03 9.0733E-04 8.5049E-04 -1.0405E-03 S3 4.8654E-01 -2.4117E-02 -3.6036E-03 1.1391E-02 -4.1171E-03 4.5281E-03 -1.0376E-03 2.6199E-04 7.0932E-05 S4 -6.2211E-02 -1.4500E-01 6.6021E-03 -6.0102E-02 -8.6415E-03 -1.9877E-03 3.0082E-03 7.1183E-04 -2.7398E-04 S5 1.1096E-01 -5.6170E-02 4.3483E-02 -1.2332E-02 2.6799E-03 -9.1756E-04 3.0503E-04 -8.9256E-05 1.4005E-05 S6 -7.3009E-01 5.0366E-02 -1.9290E-03 -3.0571E-04 1.7952E-04 -7.5058E-05 8.6339E-05 3.0289E-05 1.8189E-05 S7 -2.6606E-01 -1.1057E-01 -1.4133E-02 2.0324E-03 4.0804E-04 -1.6708E-04 6.3377E-05 6.4224E-05 3.4749E-05 S8 -4.8705E-01 -9.7309E-02 1.3150E-02 6.5743E-03 -2.2423E-03 -8.9575E-04 2.9475E-04 2.0657E-04 5.5438E-05 S9 -3.2037E-01 5.1917E-02 4.2525E-02 -8.0679E-03 -7.4989E-04 -1.4414E-03 7.7629E-04 4.9061E-05 -6.5086E-05 S10 4.4215E-02 1.8511E-01 1.7880E-01 -2.1185E-01 1.4885E-01 -8.0230E-02 3.4702E-02 -1.3458E-02 3.5178E-03

[0150] Table 14

[0151] Fig.27A and Fig.28A The axial chromatic aberration curves of the imaging lens of Example 7 are respectively shown when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.27B and Fig.28B The astigmatism curves of the imaging lens of Example 7 when the distance from the movable aperture to the imaging plane of the imaging lens on the optical axis is minimum and maximum are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.27C and Fig.28C The distortion curves of the imaging lens of Example 7 are shown respectively when the distance between the movable aperture and the imaging surface of the imaging lens on the optical axis is the smallest and the largest, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 27A to FIG. 28C It can be seen that the imaging lens provided in Example 7 can achieve good imaging quality.

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

[0153] Conditional / Example 1 2 3 4 5 6 7 f4 / f1 1.33 1.27 1.26 1.29 1.77 2.17 1.46 (|TSmin|+|TSmax|) / CT1 1.13 1.10 1.11 1.31 1.27 1.33 1.14 (SAG41+SAG42) / DT42 0.89 0.87 0.86 0.87 0.83 0.78 0.75 SAG42 / SAG41 1.00 0.99 0.95 1.03 1.21 1.29 0.87 SAG22 / CT2 1.36 1.26 1.09 1.26 1.37 1.39 1.46 (T45-SAG41) / CT4 1.27 1.31 1.35 1.23 1.20 1.39 1.06 f4 / (R7+R8) 2.61 2.44 2.45 2.73 2.86 3.45 3.91 f / R5+f / R6 2.66 2.66 2.16 3.08 2.30 2.72 2.58 CT3 / CT1 0.69 0.64 0.57 0.74 0.81 0.81 0.92 DT11 / DT52 1.22 1.22 1.19 1.23 1.22 1.23 1.20 DT42 / DT52 1.02 1.02 0.99 1.02 1.03 1.03 0.99 EPDmax / ImgH 2.39 2.39 2.39 2.39 2.39 2.39 2.39

[0154] Table 15

[0155] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in 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 only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but 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 above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: Movable aperture; A first lens having positive optical power, whose object side surface is convex; a second lens having optical power; A third lens having optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave; and a fifth lens having optical power; The second lens has negative optical power; or, the second lens has positive optical power, and the third lens and the fifth lens both have negative optical power; The number of lenses having optical power in the imaging lens is five; The effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy: 1.26≤f4 / f1<2.2; and The distance TSmin from the movable aperture to the object side of the first lens on the optical axis when the movable aperture is at the minimum distance from the imaging plane of the imaging lens, the distance TSmax from the movable aperture to the object side of the first lens on the optical axis when the movable aperture is at the maximum distance from the imaging plane of the imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 1.10≤(|TSmin|+|TSmax|) / CT1≤1.

33.

2. The imaging lens according to claim 1, characterized in that: The distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis, the distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the fourth lens on the optical axis, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 0.75≤(SAG41+SAG42) / DT42≤0.

89.

3. The imaging lens according to claim 1, wherein: A distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis and a distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the fourth lens on the optical axis satisfy: 0.87≤SAG42 / SAG41≤1.

3.

4. The imaging lens according to claim 1, wherein: A distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius vertex of the image side surface of the second lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 1.09≤SAG22 / CT2<1.

5.

5. The imaging lens according to claim 1, wherein: The distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface of the fourth lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.06≤(T45-SAG41) / CT4≤1.

39.

6. The imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens, the curvature radius R7 of the object-side surface of the fourth lens, and the curvature radius R8 of the image-side surface of the fourth lens satisfy: 2.4<f4 / (R7+R8)≤3.

91.

7. The imaging lens according to claim 1, characterized in that: The total effective focal length f of the imaging lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: 2.16≤f / R5+f / R6≤3.

08.

8. The imaging lens according to claim 7, characterized in that: A center thickness CT3 of the third lens on the optical axis and a center thickness CT1 of the first lens on the optical axis satisfy: 0.57≤CT3 / CT1≤0.

92.

9. The imaging lens according to claim 1, wherein: The maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: 1.19≤DT11 / DT52≤1.

23.

10. The imaging lens according to claim 1, wherein: The maximum effective radius DT42 of the image-side surface of the fourth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy: 0.99≤DT42 / DT52≤1.

03.

11. The imaging lens according to any one of claims 1 to 10, characterized in that: The maximum entrance pupil diameter EPDmax of the imaging lens and half the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging lens satisfy the following: 2.39≤EPDmax / ImgH<2.5.

Images