Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power; a variable aperture; a second lens; a third lens; a fourth lens; a fifth lens with negative focal power; a sixth lens with positive focal power; and a seventh lens with negative focal power; wherein the maximum entrance pupil diameter EPDmax of the optical imaging lens, the minimum entrance pupil diameter EPDmin of the optical imaging lens and the total effective focal length f of the optical imaging lens satisfy: 3.0 <f / (EPDmax‑EPDmin)<6.0。

Description

Technical Field

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

[0002] In recent years, portable electronic products with camera functions have gradually emerged, and optical imaging lenses, as an important component of the camera system, have gradually attracted public attention.

[0003] With the rapid development of camera systems in portable electronic products, higher requirements are placed on optical imaging lenses. On the one hand, in order to solve the problem of high-quality imaging, the optical structure design of optical imaging lenses is becoming more and more complex. However, complex designs usually cause the size of optical imaging lenses to become larger, which is not conducive to the demand for product miniaturization.

[0004] Therefore, there is an urgent need to provide an optical imaging lens that is miniaturized, ultra-thin, and has a large image surface. Summary of the invention

[0005] The present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power; a variable aperture; a second lens; a third lens; a fourth lens; a fifth lens with negative focal power; a sixth lens with positive focal power and a seventh lens with negative focal power. The maximum entrance pupil diameter EPDmax of the optical imaging lens, the minimum entrance pupil diameter EPDmin of the optical imaging lens and the total effective focal length f of the optical imaging lens can satisfy: 3.0 <f / (EPDmax-EPDmin)<6.0。

[0006] In one embodiment, the object-side surface of the second lens may be a convex surface, and the image-side surface may be a concave surface; the object-side surface of the third lens may be a convex surface, and the image-side surface may be a concave surface.

[0007] In one embodiment, the effective focal length f1 of the first lens and the maximum entrance pupil diameter EPDmax of the optical imaging lens may satisfy: 1.2 <f1 / EPDmax<1.8。

[0008] In one embodiment, the total effective focal length f of the optical imaging lens and the maximum change ΔDT of the aperture of the variable iris may satisfy: <f / ΔDT<9。

[0009] In one embodiment, the effective focal length f2 of the second lens, the effective focal length f5 of the fifth lens, and the effective focal length f3 of the third lens may satisfy: 0.5<(f2+f5) / f3<1.5.

[0010] In one embodiment, a curvature radius R14 of the image-side surface of the seventh lens, a curvature radius R13 of the object-side surface of the seventh lens, and an effective focal length f7 of the seventh lens may satisfy: 0.3<(R14-R13) / f7<2.1.

[0011] In one embodiment, a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, a curvature radius R3 of the object side surface of the second lens, and a curvature radius R4 of the image side surface of the second lens may satisfy: 1.4<(R5+R6) / (R3+R4)<2.1.

[0012] In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis may satisfy: 0.9 <CT1 / (CT5+CT6)<1.3。

[0013] In one embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens may satisfy: 1.3 <f12 / f56<1.8。

[0014] In one embodiment, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens may satisfy: 1.2 <SAG52 / SAG51<1.8。

[0015] In one embodiment, the interval distance T67 between the sixth lens and the seventh lens on the optical axis, the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens, and the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens may satisfy: 1.8 <T67 / (SAG62-SAG71)<2.8。

[0016] Another aspect of the present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power; a variable aperture; a second lens; a third lens; a fourth lens; a fifth lens with negative focal power; a sixth lens with positive focal power; and a seventh lens with negative focal power; wherein the effective focal length f1 of the first lens and the maximum entrance pupil diameter EPDmax of the optical imaging lens can satisfy: 1.2 <f1 / EPDmax<1.8。

[0017] In one embodiment, the object-side surface of the second lens is convex, and the image-side surface is concave; the object-side surface of the third lens is convex, and the image-side surface is concave.

[0018] In one embodiment, the maximum entrance pupil diameter EPDmax of the optical imaging lens, the minimum entrance pupil diameter EPDmin of the optical imaging lens, and the total effective focal length f of the optical imaging lens may satisfy: 3.0 <f / (EPDmax-EPDmin)<6.0。

[0019] In one embodiment, the total effective focal length f of the optical imaging lens and the maximum change ΔDT of the aperture of the variable iris may satisfy: <f / ΔDT<9。

[0020] In one embodiment, the effective focal length f2 of the second lens, the effective focal length f5 of the fifth lens, and the effective focal length f3 of the third lens may satisfy: 0.5<(f2+f5) / f3<1.5.

[0021] In one embodiment, a curvature radius R14 of the image-side surface of the seventh lens, a curvature radius R13 of the object-side surface of the seventh lens, and an effective focal length f7 of the seventh lens may satisfy: 0.3<(R14-R13) / f7<2.1.

[0022] In one embodiment, a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, a curvature radius R3 of the object side surface of the second lens, and a curvature radius R4 of the image side surface of the second lens may satisfy: 1.4<(R5+R6) / (R3+R4)<2.1.

[0023] In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis may satisfy: 0.9 <CT1 / (CT5+CT6)<1.3。

[0024] In one embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens may satisfy: 1.3 <f12 / f56<1.8。

[0025] In one embodiment, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens may satisfy: 1.2 <SAG52 / SAG51<1.8。

[0026] In one embodiment, the interval distance T67 between the sixth lens and the seventh lens on the optical axis, the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens, and the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens may satisfy: 1.8 <T67 / (SAG62-SAG71)<2.8。

[0027] The present application adopts a combination of seven lenses and a variable iris. By reasonably allocating the optical focal length, surface shape, center thickness of each lens, and axial spacing between lenses, and by setting a variable iris with adjustable aperture, the above-mentioned optical imaging lens has at least one beneficial effect of miniaturization, ultra-thinness, adjustable aperture, large image surface, high imaging quality, good structure and process performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0029] Figure 1A and Figure 1B Schematic diagrams of the structures of the optical imaging lens in the maximum aperture state and the minimum aperture state according to Embodiment 1 of the present application are respectively shown;

[0030] FIG. 2A to FIG. 2C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 1 at the maximum aperture number are respectively shown;

[0031] FIG. 3A to FIG. 3C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 1 at the minimum aperture number are respectively shown;

[0032] Figure 4A and Figure 4B The schematic diagrams of the structures of the optical imaging lens according to Embodiment 2 of the present application are shown respectively;

[0033] FIG. 5A to FIG. 5C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 2 at the maximum aperture number are respectively shown;

[0034] FIG. 6A to FIG. 6C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 2 at the minimum aperture number are respectively shown;

[0035] Fig. 7A and Figure 7B The schematic diagrams of the structures of the optical imaging lens according to Embodiment 3 of the present application are respectively shown;

[0036] FIG. 8A to FIG. 8C The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of Example 3 at the maximum aperture number are respectively shown;

[0037] 9A to 9C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 3 at the minimum aperture number are respectively shown;

[0038] Fig. 10A and Fig. 10B The schematic diagrams of the structures of the optical imaging lens according to Embodiment 4 of the present application are respectively shown;

[0039] FIG. 11A to FIG. 11C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 4 at the maximum aperture number are respectively shown;

[0040] FIG. 12A to FIG. 12C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 4 at the minimum aperture number are respectively shown;

[0041] Fig.13A and Fig. 13B The schematic diagrams of the structures of the optical imaging lens according to Embodiment 5 of the present application are respectively shown;

[0042] FIG. 14A to FIG. 14C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 5 at the maximum aperture number are respectively shown;

[0043] FIG. 15A to FIG. 15C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 5 at the minimum aperture number are respectively shown;

[0044] Fig.16A and Fig. 16B The schematic diagrams of the structures of the optical imaging lens according to Embodiment 6 of the present application are respectively shown;

[0045] 17A to 17C axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 6 at the maximum aperture number are respectively shown; and

[0046] 18A to 18C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Example 6 at the minimum aperture number are respectively shown. 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] According to the exemplary embodiment of the present application, the optical imaging lens may include, for example, seven lenses with optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, there may be an air gap between any two adjacent lenses and the aperture. 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 negative optical power; the fifth lens may have negative optical power; the sixth lens may have positive optical power; and the seventh lens may have negative optical power. By reasonably controlling the positive and negative distribution of the optical power of each component of the lens, the compactness of the optical imaging lens can be guaranteed. Thus, the optical imaging lens has the characteristics of large aperture and ultra-thinness while maintaining the smooth and stable transmission of light, and can effectively improve the imaging quality of the optical imaging lens.

[0056] In an exemplary embodiment, the object side surface of the second lens may be a convex surface, and the image side surface may be a concave surface. By setting the surface shape of the second lens, the optical imaging lens can better converge light and achieve the effect of increasing the aperture.

[0057] In an exemplary embodiment, the object side surface of the third lens may be a convex surface, and the image side surface may be a concave surface. By setting the surface shape of the third lens, the optical imaging lens can further converge light and achieve the effect of increasing the aperture.

[0058] In an exemplary embodiment, the optical imaging lens further includes a variable aperture. The aperture of the variable aperture is adjustable. Specifically, it can be a variable aperture of a blade moving type or a variable aperture of a blade switching type. The variable aperture can be used to control the size of the aperture. The variable aperture can reside at a maximum aperture and a minimum aperture, respectively, or at a position therebetween.

[0059] In an exemplary embodiment, the optical imaging lens of the present application includes a variable aperture. The optical imaging lens satisfies 3.0 < f / (EPDmax - EPDmin) < 6.0, where EPDmax is the maximum entrance pupil diameter of the optical imaging lens, EPDmin is the minimum entrance pupil diameter of the optical imaging lens, and f is the total effective focal length of the optical imaging lens. The optical imaging lens satisfying 3.0 < f / (EPDmax - EPDmin) < 6.0 can further increase the variation range of its aperture. When using this optical imaging lens for shooting, the aperture can be adjusted according to different shooting scenes. The images captured using this optical imaging lens have a greater sense of hierarchy. More specifically, f, EPDmin, and EPDmax satisfy 4.40 < f / (EPDmax - EPDmin) < 4.55.

[0060] In an exemplary embodiment, the optical imaging lens of the present application satisfies 1.2 < f1 / EPDmax < 1.8, where f1 is the effective focal length of the first lens and EPDmax is the maximum entrance pupil diameter of the optical imaging lens. The optical imaging lens satisfying 1.2 < f1 / EPDmax < 1.8 can increase the amount of light passing through in the large aperture state, thereby enhancing the image quality. More specifically, f1 and EPDmax satisfy 1.40 < f1 / EPDmax < 1.70.

[0061] In an exemplary embodiment, the optical imaging lens provided by the present application satisfies 7 < f / ΔDT < 9, where f is the total effective focal length of the optical imaging lens and ΔDT is the maximum change amount of the light passing aperture of the variable aperture. The optical imaging lens satisfying 7 < f / ΔDT < 9 is beneficial to increasing the aperture range and can ensure that the optical imaging lens has a large variable aperture range to present a better shooting effect during the process of changing the aperture. More specifically, f and ΔDT satisfy 8.42 < f / ΔDT < 8.78.

[0062] In an exemplary embodiment, the optical imaging lens of the present application satisfies 0.5 < (f2 + f5) / f3 < 1.5, where f2 is the effective focal length of the second lens, f5 is the effective focal length of the fifth lens, and f3 is the effective focal length of the third lens. The optical imaging lens satisfying 0.5 < (f2 + f5) / f3 < 1.5 is beneficial to optimizing spherical aberration. More specifically, f2, f5, and f3 satisfy 0.70 < (f2 + f5) / f3 < 1.25.

[0063] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy 0.3 < (R14 - R13) / f7 < 2.1, where R14 is the radius of curvature of the image side of the seventh lens, R13 is the radius of curvature of the object side of the seventh lens, and f7 is the effective focal length of the seventh lens. Satisfying 0.3 < (R14 - R13) / f7 < 2.1 is beneficial to optimizing the lens shape of the seventh lens. More specifically, R14, R13, and f7 can satisfy 0.35 < (R14 - R13) / f7 < 2.10.

[0064] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy 1.4 < (R5 + R6) / (R3 + R4) < 2.1, where R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens R4. The optical imaging lens satisfying 1.4 < (R5 + R6) / (R3 + R4) < 2.1 is beneficial to synchronously optimizing the lens shapes of the second lens and the third lens, and can correct the spherical aberration and chromatic aberration of the optical imaging lens. More specifically, R5, R6, R3, and R4 can satisfy 1.45 < (R5 + R6) / (R3 + R4) < 1.87.

[0065] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy 0.9 < CT1 / (CT5 + CT6) < 1.3, where CT1 is the central thickness of the first lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. The optical imaging lens satisfying 0.9 < CT1 / (CT5 + CT6) < 1.3 is beneficial to optimizing the spherical aberration of the optical imaging lens, and can improve the distortion of the optical imaging lens to a certain extent. More specifically, CT1, CT5, and CT6 can satisfy 0.92 < CT1 / (CT5 + CT6) < 1.02.

[0066] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy 1.3 < f12 / f56 < 1.8, where f12 is the combined focal length of the first lens and the second lens, and f56 is the combined focal length of the fifth lens and the sixth lens. Satisfying 1.3 < f12 / f56 < 1.8 is beneficial to optimizing the aberration of the optical imaging lens, and can improve the structural and technological performance of the optical imaging lens. More specifically, f12 and f56 can satisfy 1.30 < f12 / f56 < 1.73.

[0067] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy: 1.2 < SAG52 / SAG51 < 1.8, where SAG52 is the axial distance between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens, and SAG51 is the axial distance between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens. The optical imaging lens satisfying 1.2 < SAG52 / SAG51 < 1.8 is beneficial to optimizing the lens shape and process performance of the fifth lens, and can improve the astigmatism of the optical imaging lens and reduce the ghost intensity generated by the reflection of the fifth lens and the third lens.

[0068] In an exemplary embodiment, the optical imaging lens provided by the present application can satisfy: 1.8 < T67 / (SAG62 - SAG71) < 2.8, where T67 is the axial spacing distance between the sixth lens and the seventh lens on the optical axis, SAG62 is the axial distance between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens, and SAG71 is the axial distance between the intersection point of the object side of the seventh lens and the optical axis and the vertex of the effective radius of the object side of the seventh lens. Satisfying 1.8 < T67 / (SAG62 - SAG71) < 2.8 is beneficial to optimizing the lens shapes of the sixth lens and the seventh lens, thereby optimizing the field curvature of the optical imaging lens, and can optimize the ghosts generated by the reflection between the sixth lens, the seventh lens and other lenses. More specifically, T67, SAG62 and SAG71 can satisfy: 1.90 < T67 / (SAG62 - SAG71) < 2.80.

[0069] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0070] The optical imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the seven lenses described above. The present application provides an optical imaging lens that can balance miniaturization and adjustable aperture. By reasonably allocating the optical power, surface type, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the optical imaging system can be effectively reduced, the sensitivity of the optical imaging system can be lowered, and the processability of the camera lens group can be improved, making the optical imaging system more conducive to production and processing and applicable to portable electronic products. At the same time, the optical imaging lens of the present application also has beneficial effects such as adjustable aperture, large image plane, good structure and performance. In addition, a dual-aperture design scheme is added, so that the aperture of the optical imaging lens can be adjusted, and then the aperture can be adjusted according to different shooting scenarios during use, making the captured pictures more layered.

[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 object side surface of the first lens to the image side surface of the seventh 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 occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh 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 optical imaging lens can be changed 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 optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0073] Specific embodiments of the optical 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 1A to 3C An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1A and Figure 1B A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown.

[0076] like Figure 1A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0077] 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

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

[0079]

[0080]

[0081] Table 1

[0082] In Example 1, the total effective focal length f of the optical imaging lens is 4.89 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.40, the maximum value FNOmax of the F number of the optical imaging lens is 2.04, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.55 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.20 mm.

[0083] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 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:

[0084]

[0085] 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 A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0086]

[0087]

[0088] Table 2

[0089] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 at the minimum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the back of the lens deviates. Figure 2B The astigmatism curve of the optical imaging lens of Example 1 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 3A The axial chromatic aberration curve of the optical imaging lens of Example 1 at the maximum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the lens is deviated. Figure 3B The astigmatism curve of the optical imaging lens of Example 1 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 3C The distortion curve of the optical imaging lens of Example 1 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figures 2A to 3C It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0090] Example 2

[0091] The following reference 4A to 6C The optical 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 4A and Figure 4B A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown.

[0092] like Figure 4A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0093] 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 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 convex. 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0094] In Example 2, the total effective focal length f of the optical imaging lens is 4.90 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.40, the maximum value FNOmax of the F number of the optical imaging lens is 2.04, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.55 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.20 mm.

[0095] Table 3 shows the basic parameters of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness 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.

[0096]

[0097] Table 3

[0098]

[0099]

[0100] Table 4

[0101] Figure 5A The axial chromatic aberration curve of the optical imaging lens of Example 2 at the minimum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the back of the lens deviates. Figure 5B The astigmatism curve of the optical imaging lens of Example 2 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 5C The distortion curve of the optical imaging lens of Example 2 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 6A The axial chromatic aberration curve of the optical imaging lens of Example 2 at the maximum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the back of the lens deviates. Figure 6B The astigmatism curve of the optical imaging lens of Example 2 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6C The distortion curve of the optical imaging lens of Example 2 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 5A to FIG. 6C It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following reference 7A to 9C An optical imaging lens according to Embodiment 3 of the present application is described. Fig. 7A and Figure 7B A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.

[0104] like Fig. 7A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0105] 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 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 convex. 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0106] In Example 3, the total effective focal length f of the optical imaging lens is 4.91 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.41, the maximum value FNOmax of the F number of the optical imaging lens is 2.04, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.55 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.18 mm.

[0107] Table 5 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0108]

[0109]

[0110] Table 5

[0111]

[0112]

[0113] Table 6

[0114] Fig. 8A The axial chromatic aberration curve of the optical imaging lens of Example 3 at the minimum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the lens is deviated. Figure 8B The astigmatism curve of the optical imaging lens of Example 3 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8C The distortion curve of the optical imaging lens of Example 3 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 9A The axial chromatic aberration curve of the optical imaging lens of Example 3 at the maximum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the lens deviates. Fig. 9B The astigmatism curve of the optical imaging lens of Example 3 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 9C The distortion curve of the optical imaging lens of Example 3 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. 8A to 9C It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0115] Example 4

[0116] The following reference FIG. 10A to FIG. 12C An optical imaging lens according to Embodiment 4 of the present application is described. Fig. 10A A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown.

[0117] like Fig. 10A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0118] 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0119] In Example 4, the total effective focal length f of the optical imaging lens is 4.86 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.40, the maximum value FNOmax of the F number of the optical imaging lens is 2.05, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.55 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.18 mm.

[0120] Table 7 shows the basic parameters of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness 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.

[0121]

[0122]

[0123] Table 7

[0124] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.5745E-03 1.4932E-03 1.6480E-02 -7.4165E-02 1.5508E-01 -2.0045E-01 1.7324E-01 S3 -4.6899E-02 4.1948E-02 -1.5350E-01 4.1725E-01 -6.5252E-01 4.9584E-01 1.0713E-01 S4 -4.6040E-02 -8.5254E-03 1.0089E-01 -3.7545E-01 8.8613E-01 -1.4018E+00 1.5149E+00 S5 -4.3974E-02 1.6450E-01 -7.3583E-01 2.0556E+00 -4.0641E+00 5.7686E+00 -5.9603E+00 S6 -8.1911E-02 1.9441E-01 -4.5342E-01 7.6157E-01 -9.2595E-01 8.0199E-01 -4.8697E-01 S7 -6.4193E-02 9.7941E-02 -5.7724E-02 -2.4725E-01 9.0538E-01 -1.5692E+00 1.7110E+00 S8 -3.8427E-02 -9.8366E-02 5.3799E-01 -1.6287E+00 3.2259E+00 -4.4301E+00 4.3392E+00 S9 -3.5527E-02 -2.9581E-04 3.8231E-02 -2.3276E-02 -7.4046E-02 1.6774E-01 -1.7531E-01 S10 -1.5386E-01 -5.6542E-02 2.6008E-01 -3.3439E-01 2.7117E-01 -1.5770E-01 6.8737E-02 S11 -5.6874E-02 -6.2998E-02 1.3967E-01 -1.8867E-01 1.7335E-01 -1.1123E-01 5.0404E-02 S12 9.0314E-02 1.9061E-02 -1.5740E-01 1.8110E-01 -1.1846E-01 5.1209E-02 -1.5444E-02 S13 -2.0743E-01 9.4041E-02 -3.8536E-02 1.3593E-02 -1.9508E-03 -6.3422E-04 4.0148E-04 S14 -2.8885E-01 1.9403E-01 -1.1328E-01 5.2748E-02 -1.8730E-02 4.9940E-03 -9.9398E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.0302E-01 4.2320E-02 -1.1797E-02 2.1294E-03 -2.2440E-04 1.0477E-05 0.0000E+00 S3 -6.7331E-01 7.6526E-01 -4.8771E-01 1.9480E-01 -4.8497E-02 6.9081E-03 -4.3116E-04 S4 -1.1182E+00 5.5316E-01 -1.7503E-01 3.1961E-02 -2.5579E-03 0.0000E+00 0.0000E+00 S5 4.5033E+00 -2.4667E+00 9.5465E-01 -2.4756E-01 3.8576E-02 -2.7271E-03 0.0000E+00 S6 2.0054E-01 -5.1310E-02 5.9710E-03 4.7759E-04 -2.2175E-04 1.8294E-05 0.0000E+00 S7 -1.2563E+00 6.3073E-01 -2.1352E-01 4.6561E-02 -5.8964E-03 3.2897E-04 0.0000E+00 S8 -3.0712E+00 1.5730E+00 -5.7691E-01 1.4758E-01 -2.4987E-02 2.5143E-03 -1.1375E-04 S9 1.1434E-01 -5.0230E-02 1.5165E-02 -3.1109E-03 4.1481E-04 -3.2436E-05 1.1283E-06 S10 -2.2868E-02 5.8219E-03 -1.1173E-03 1.5582E-04 -1.4803E-05 8.5046E-07 -2.2168E-08 S11 -1.6301E-02 3.7770E-03 -6.2196E-04 7.0994E-05 -5.3347E-06 2.3713E-07 -4.7205E-09 S12 3.3301E-03 -5.1691E-04 5.7289E-05 -4.4182E-06 2.2489E-07 -6.7782E-09 9.1390E-11 S13 -1.0321E-04 1.6183E-05 -1.6775E-06 1.1611E-07 -5.1837E-09 1.3541E-10 -1.5753E-12 S14 1.4694E-04 -1.5999E-05 1.2629E-06 -7.0202E-08 2.6041E-09 -5.7853E-11 5.8216E-13

[0125] Table 8

[0126] Fig.11A The axial chromatic aberration curve of the optical imaging lens of Example 4 at the minimum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the back of the lens deviates. Fig. 11B The astigmatism curve of the optical imaging lens of Example 4 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 11C The distortion curve of the optical imaging lens of Example 4 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 12A The axial chromatic aberration curve of the optical imaging lens of Example 4 at the maximum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the lens deviates. Fig. 12B The astigmatism curve of the optical imaging lens of Example 4 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 12C The distortion curve of the optical imaging lens of Example 4 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 11A to FIG. 12C It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0127] Example 5

[0128] The following reference FIG. 13A to FIG. 15C An optical imaging lens according to Embodiment 5 of the present application is described. Fig.13A A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown.

[0129] like Fig.13A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0130] 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0131] In Example 5, the total effective focal length f of the optical imaging lens is 4.85 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.40, the maximum value FNOmax of the F number of the optical imaging lens is 2.04, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.42 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.18 mm.

[0132] Table 9 shows the basic parameters of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness 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.

[0133]

[0134]

[0135] Table 9

[0136] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.6556E-03 2.0728E-02 -7.5518E-02 1.8734E-01 -3.2053E-01 3.7858E-01 -3.1175E-01 S3 -4.9594E-02 3.5365E-02 -7.6853E-02 5.8784E-02 4.0248E-01 -1.5854E+00 2.9483E+00 S4 -5.0267E-02 -2.9920E-04 7.5647E-02 -3.0014E-01 7.4200E-01 -1.2298E+00 1.3913E+00 S5 -3.7088E-02 1.5130E-01 -7.1784E-01 2.0135E+00 -3.9205E+00 5.4547E+00 -5.5336E+00 S6 -6.4358E-02 1.7963E-01 -5.2162E-01 1.0376E+00 -1.4721E+00 1.5081E+00 -1.1200E+00 S7 -7.1034E-02 1.2604E-01 -2.2711E-01 2.1693E-01 1.1397E-01 -6.6233E-01 1.0009E+00 S8 -3.2443E-02 -1.1773E-01 6.7204E-01 -2.1396E+00 4.4287E+00 -6.3353E+00 6.4536E+00 S9 -4.7343E-02 4.5556E-03 5.1048E-02 -3.3411E-02 -1.1831E-01 2.8607E-01 -3.2073E-01 S10 -1.3692E-01 -9.4190E-02 3.3182E-01 -4.2526E-01 3.5269E-01 -2.1198E-01 9.5993E-02 S11 -2.4390E-02 -1.1218E-01 1.9808E-01 -2.4416E-01 2.2022E-01 -1.4377E-01 6.7169E-02 S12 9.6162E-02 1.9864E-02 -1.7901E-01 2.2126E-01 -1.5442E-01 7.0640E-02 -2.2425E-02 S13 -2.1652E-01 1.0724E-01 -4.6995E-02 1.6449E-02 -2.4942E-03 -5.8680E-04 4.0580E-04 S14 -3.1605E-01 2.3842E-01 -1.5748E-01 8.1890E-02 -3.1844E-02 9.1013E-03 -1.9044E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.7988E-01 -7.2303E-02 1.9811E-02 -3.5251E-03 3.6699E-04 -1.6960E-05 0.0000E+00 S3 -3.4056E+00 2.6272E+00 -1.3807E+00 4.8928E-01 -1.1203E-01 1.4981E-02 -8.8899E-04 S4 -1.0727E+00 5.5272E-01 -1.8157E-01 3.4315E-02 -2.8338E-03 0.0000E+00 0.0000E+00 S5 4.1217E+00 -2.2365E+00 8.6176E-01 -2.2362E-01 3.5033E-02 -2.5010E-03 0.0000E+00 S6 5.9881E-01 -2.2583E-01 5.7879E-02 -9.4687E-03 8.8184E-04 -3.5542E-05 0.0000E+00 S7 -8.7873E-01 4.9829E-01 -1.8497E-01 4.3435E-02 -5.8523E-03 3.4441E-04 0.0000E+00 S8 -4.7464E+00 2.5251E+00 -9.6174E-01 2.5547E-01 -4.4912E-02 4.6926E-03 -2.2047E-04 S9 2.2469E-01 -1.0610E-01 3.4441E-02 -7.5986E-03 1.0899E-03 -9.1677E-05 3.4307E-06 S10 -3.3248E-02 8.8181E-03 -1.7636E-03 2.5643E-04 -2.5405E-05 1.5226E-06 -4.1410E-08 S11 -2.2486E-02 5.3985E-03 -9.2129E-04 1.0899E-04 -8.4878E-06 3.9102E-07 -8.0672E-09 S12 5.0762E-03 -8.2639E-04 9.6035E-05 -7.7663E-06 4.1460E-07 -1.3108E-08 1.8544E-10 S13 -1.0548E-04 1.6601E-05 -1.7256E-06 1.1974E-07 -5.3596E-09 1.4036E-10 -1.6371E-12 S14 2.9147E-04 -3.2496E-05 2.6071E-06 -1.4658E-07 5.4845E-09 -1.2273E-10 1.2438E-12

[0137] Table 10

[0138] Fig.14A The axial chromatic aberration curve of the optical imaging lens of Example 5 at the minimum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the lens deviates. Fig. 14B The astigmatism curve of the optical imaging lens of Example 5 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 14C The distortion curve of the optical imaging lens of Example 5 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.15AThe axial chromatic aberration curve of the optical imaging lens of Example 5 at the maximum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the lens deviates. Fig. 15B The astigmatism curve of the optical imaging lens of Example 5 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 15C The distortion curve of the optical imaging lens of Example 5 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 14A to FIG. 15C It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0139] Example 6

[0140] The following reference FIG. 16A to FIG. 18C An optical imaging lens according to Embodiment 6 of the present application is described. Fig.16A A schematic structural diagram of an optical imaging lens according to Example 6 of the present application is shown.

[0141] like Fig.16A As shown, the optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0142] 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0143] In Example 6, the total effective focal length f of the optical imaging lens is 4.78 mm, the minimum value FNOmin of the F number of the optical imaging lens is 1.39, the maximum value FNOmax of the F number of the optical imaging lens is 2.02, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.30 mm, and the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S17 is 4.18 mm.

[0144] Table 11 shows the basic parameters of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness 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.

[0145]

[0146] Table 11

[0147]

[0148]

[0149] Table 12

[0150] Fig.17A The axial chromatic aberration curve of the optical imaging lens of Example 6 at the minimum aperture number is shown, which indicates that the convergent focus of light of different wavelengths passing through the lens deviates. Fig. 17B The astigmatism curve of the optical imaging lens of Example 6 at the minimum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 17C The distortion curve of the optical imaging lens of Example 6 at the minimum aperture number is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.18A The axial chromatic aberration curve of the optical imaging lens of Example 6 at the maximum aperture number is shown, which indicates that the convergent focus of light rays of different wavelengths passing through the lens deviates. Fig.18B The astigmatism curve of the optical imaging lens of Example 6 at the maximum aperture number is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 18C The distortion curve of the optical imaging lens of Example 6 at the maximum aperture number is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. 17A to 18C It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0151] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0152]

[0153]

[0154] Table 13

[0155] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (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 optical 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 protection 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 concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; Variable aperture; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a fourth lens element having positive refractive power and a convex object-side surface; A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens element having positive power, whose object-side surface is convex and whose image-side surface is concave; and The seventh lens element has a negative optical power, and its object side surface is convex and its image side surface is concave; The maximum entrance pupil diameter EPDmax of the optical imaging lens, the minimum entrance pupil diameter EPDmin of the optical imaging lens, and the total effective focal length f of the optical imaging lens satisfy: 4.40 <f / (EPDmax-EPDmin)<4.55; The number of lenses having optical power in the optical imaging lens is seven.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the maximum entrance pupil diameter EPDmax of the optical imaging lens satisfy: 1.40 <f1 / EPDmax<1.70。 3. The optical imaging lens according to claim 1, wherein: The total effective focal length f of the optical imaging lens and the maximum change ΔDT of the aperture of the variable iris satisfy: 8.42 <f / ΔDT<8.78。 4. The optical imaging lens according to claim 1, wherein: The effective focal length f2 of the second lens, the effective focal length f5 of the fifth lens and the effective focal length f3 of the third lens satisfy: 0.75≤(f2+f5) / f3<1.

25.

5. The optical imaging lens according to claim 1, wherein: The curvature radius R14 of the image side surface of the seventh lens, the curvature radius R13 of the object side surface of the seventh lens, and the effective focal length f7 of the seventh lens satisfy: 0.35<(R14-R13) / f7<2.

10.

6. The optical imaging lens according to claim 1, wherein: The curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 1.50≤(R5+R6) / (R3+R4)<1.

87.

7. The optical imaging lens according to claim 1, wherein: The center thickness CT1 of the first lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.9 <CT1 / (CT5+CT6)<1.02。 8. The optical imaging lens according to claim 1, wherein: The combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 1.35≤f12 / f56<1.

73.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens satisfy: 1.2 <SAG52 / SAG51≤1.72。 10. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The interval distance T67 between the sixth lens and the seventh lens on the optical axis, the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens, and the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the effective radius vertex of the object side surface of the seventh lens satisfy: 1.90 <T67 / (SAG62-SAG71)<2.8。

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