Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with a positive optical power; a third lens with a positive optical power; a fourth lens with a negative optical power; a fifth lens with a positive optical power; a sixth lens with a positive optical power; and a seventh lens with a negative optical power. At least four of the first lens to the fifth lens are plastic lenses; the sixth lens is a spherical lens made of glass; and the combined focal length f67 of the sixth lens and the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.0 < f67 / (R11 + R14) < 4.5.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application with the invention name “Optical Imaging Lens” and application number 202110629127.X submitted on June 3, 2021. Technical Field

[0003] The present application relates to the field of optical elements, and in particular, to an optical imaging lens. Background Art

[0004] As video surveillance products gradually move toward high-definition imaging, their resolution has grown from 300,000 pixels to nearly 3 million pixels, ushering in a revolution in global video surveillance technology. Simultaneously, surveillance cameras, a core component of video surveillance, are entering a period of rapid development.

[0005] Currently, security monitoring systems are widely used in numerous public spaces, including road traffic, industrial production, hospitals, airports, and libraries. Optical imaging lenses play a crucial role in these systems. Building on existing technologies, how to optimally balance key technical parameters such as the focal length and material of each lens element to achieve lower costs and higher pixel resolution has become a pressing challenge for lens designers. Summary of the Invention

[0006] The present application provides an optical imaging lens comprising, in order from the object side to the image side along the optical axis, a first lens having optical power; a second lens having positive optical power; a third lens having optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having optical power; and a seventh lens having optical power. At least four of the first through fifth lenses are made of plastic; the sixth lens is a spherical glass lens; and the total effective focal length f of the optical imaging lens and the entrance pupil diameter (EPD) of the optical imaging lens satisfy the following relationship: f / EPD < 1.2.

[0007] In one embodiment, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface.

[0008] In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens may satisfy: -3.6<f1 / f<-2.2.

[0009] In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens may satisfy: 0.4<f4 / f7<1.7.

[0010] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.2 < (f5 + f6) / f3 < 2.4.

[0011] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens may satisfy: -0.7 < (R1 + R2) / (R3 + R4) < -0.3.

[0012] In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens may satisfy: 1.7 < R7 / R8 < 2.8.

[0013] In one embodiment, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens may satisfy: 0 < (R9 + R10) / (R9 - R10) < 0.6.

[0014] In one embodiment, the combined focal length f67 of the sixth lens and the seventh lens, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R14 of the image side surface of the seventh lens may satisfy: 1.0 < f67 / (R11 + R14) < 4.5.

[0015] In one embodiment, the distance T12 between the first lens and the second lens on the optical axis, the distance SAG11 on the optical axis from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, and the distance SAG12 on the optical axis from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens may satisfy: 0.8 < T12 / (SAG11 + SAG12) < 1.4.

[0016] In one embodiment, the central thickness CT2 of the second lens on the optical axis, the distance SAG21 on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens, and the distance SAG22 on the optical axis from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens may satisfy: 2.9 < CT2 / (SAG21 - SAG22) < 6.0.

[0017] In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.5 < (ET4 + ET5) / (ET6 + ET7) < 1.3.

[0018] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens satisfy: 2.0 < TTL / f < 4.0.

[0019] In one embodiment, the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis and the sum ∑AT of the spacing distances of any two adjacent lenses among the first lens to the seventh lens on the optical axis satisfy: 2.6 < ∑CT / ∑AT < 4.2.

[0020] In one embodiment, the optical imaging lens further includes an aperture. The distance SL from the aperture to the imaging surface of the optical imaging lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 1.2 < SL / (CT3 + CT4 + CT5 + CT6 + CT7) < 1.7.

[0021] On the other hand, the present application provides such an optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens having a focal power; a second lens having a positive focal power; a third lens having a focal power; a fourth lens having a negative focal power; a fifth lens having a positive focal power; a sixth lens having a focal power; and a seventh lens having a focal power. At least four of the first lens to the fifth lens are plastic lenses; the sixth lens is a spherical glass lens; and the combined focal length f67 of the sixth lens and the seventh lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.0 < f67 / (R11 + R14) < 4.5.

[0022] In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -3.6 < f1 / f < -2.2.

[0023] In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy: 0.4 < f4 / f7 < 1.7.

[0024] In one embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 0.2 < (f5 + f6) / f3 < 2.4.

[0025] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens may satisfy: -0.7 < (R1 + R2) / (R3 + R4) < -0.3.

[0026] In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens may satisfy: 1.7 < R7 / R8 < 2.8.

[0027] In one embodiment, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens may satisfy: 0 < (R9 + R10) / (R9 - R10) < 0.6.

[0028] In one embodiment, the distance T12 between the first lens and the second lens on the optical axis, the distance SAG11 on the optical axis from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, and the distance SAG12 on the optical axis from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens may satisfy: 0.8 < T12 / (SAG11 + SAG12) < 1.4.

[0029] In one embodiment, the central thickness CT2 of the second lens on the optical axis, the distance SAG21 on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens, and the distance SAG22 on the optical axis from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens may satisfy: 2.9 < CT2 / (SAG21 - SAG22) < 6.0.

[0030] In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.5 < (ET4 + ET5) / (ET6 + ET7) < 1.3.

[0031] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens and the total effective focal length f of the optical imaging lens may satisfy: 2.0 < TTL / f < 4.0.

[0032] In one embodiment, the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis and the sum ∑AT of the distances between any two adjacent lenses of the first lens to the seventh lens on the optical axis may satisfy: 2.6 < ∑CT / ∑AT < 4.2.

[0033] In one embodiment, the optical imaging lens further includes an aperture, and a distance SL on the optical axis from the aperture to the imaging plane of the optical imaging lens, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis may satisfy the following: 1.2<SL / (CT3+CT4+CT5+CT6+CT7)<1.7.

[0034] The present application uses seven lenses. By rationally allocating the material, optical focal length, surface shape, center thickness of each lens, and on-axis spacing between lenses, the optical imaging lens has at least one beneficial effect of large aperture, high definition, low cost, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0036] Figure 1 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application;

[0037] Figures 2A to 2D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 1 are respectively shown;

[0038] Figure 3 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application;

[0039] Figures 4A to 4D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 2 are respectively shown;

[0040] Figure 5 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0041] Figures 6A to 6D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 3 are respectively shown;

[0042] Figure 7 1 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application;

[0043] Figures 8A to 8D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 4 are respectively shown;

[0044] Figure 9The structural schematic diagram of an optical imaging lens according to Embodiment 5 of the present application is shown; and

[0045] Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Embodiment 5 are respectively shown. Detailed implementation manners

[0046] To better understand the present application, more detailed descriptions will be made on various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] In the drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lenses have been slightly exaggerated. 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 spherical or aspherical surfaces shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0049] 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 at least convex 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 at least concave in the paraxial region. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0050] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", 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 their combinations. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than modifying a single element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0052] It should be noted that, without conflict, the embodiments and features in the embodiments of this application may be combined with each other. The following will describe this application in detail with reference to the accompanying drawings and in combination with the embodiments.

[0053] The features, principles and other aspects of this application will be described in detail below.

[0054] The optical imaging lens according to an exemplary embodiment of this application may include seven lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. These seven lenses are arranged in sequence along the optical axis from the object side to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the seventh lens.

[0055] In the exemplary embodiment, the first lens may have a positive optical power or a negative optical power; the second lens may have a positive optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive optical power; the sixth lens may have a positive optical power or a negative optical power; and the seventh lens may have a positive optical power or a negative optical power. By reasonably setting the optical powers of the first lens to the seventh lens, it is beneficial to reasonably distribute the optical powers of each lens, thereby reducing the sensitivity of each lens as much as possible and improving the production yield of the lens.

[0056] In the exemplary embodiment, the optical imaging lens according to this application may satisfy: f / EPD < 1.2, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. More specifically, f and EPD may further satisfy: f / EPD < 1.1. Satisfying f / EPD < 1.2 is beneficial for the lens to have characteristics such as a large aperture.

[0057] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -3.6 < f1 / f < -2.2, where f1 is the effective focal length of the first lens and f is the total effective focal length of the optical imaging lens. More specifically, f1 and f can further satisfy: -3.6 < f1 / f < -2.3. Satisfying -3.6 < f1 / f < -2.2 is beneficial to reasonably distribute the optical power of each lens, which can avoid problems such as excessive concentration of optical power on the first lens leading to increased sensitivity and reduced yield, and can also avoid a series of problems such as increased sensitivity caused by excessive concentration of optical power on the subsequent several lenses.

[0058] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0.4 < f4 / f7 < 1.7, where f4 is the effective focal length of the fourth lens and f7 is the effective focal length of the seventh lens. Satisfying 0.4 < f4 / f7 < 1.7 is beneficial to reasonably distribute the optical power of the fourth lens and the seventh lens. At the same time, combined with -3.6 < f1 / f < -2.2, it is beneficial to reduce the lens sensitivity, especially beneficial to reduce the temperature sensitivity of the lens, etc.

[0059] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0.2 < (f5 + f6) / f3 < 2.4, where f3 is the effective focal length of the third lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. Satisfying 0.2 < (f5 + f6) / f3 < 2.4 is beneficial to improve the sensitivity of each lens and enhance the lens yield.

[0060] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -0.7 < (R1 + R2) / (R3 + R4) < -0.3, where R1 is the curvature radius of the object side of the first lens, R2 is the curvature radius of the image side of the first lens, R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens. Satisfying -0.7 < (R1 + R2) / (R3 + R4) < -0.3 can not only ensure that the first lens and the second lens have reasonable optical power to avoid problems such as poor lens image quality, but also improve the manufacturability of the first lens and the second lens.

[0061] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.7 < R7 / R8 < 2.8, where R7 is the curvature radius of the object side of the fourth lens and R8 is the curvature radius of the image side of the fourth lens. More specifically, R7 and R8 can further satisfy: 1.8 < R7 / R8 < 2.8. Satisfying 1.7 < R7 / R8 < 2.8 can ensure that the fourth lens has a certain optical power while making the fourth lens have good manufacturability, which is beneficial to the subsequent processing and assembly of the lens.

[0062] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0 < (R9 + R10) / (R9 - R10) < 0.6, where R9 is the curvature radius of the object side surface of the fifth lens, and R10 is the curvature radius of the image side surface of the fifth lens. More specifically, R9 and R10 can further satisfy: 0.1 < (R9 + R10) / (R9 - R10) < 0.5. Satisfying 0 < (R9 + R10) / (R9 - R10) < 0.6 can ensure that the fifth lens has the ability to converge light, while ensuring the processability of the fifth lens and reducing the sensitivity of the fifth lens.

[0063] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.0 < f67 / (R11 + R14) < 4.5, where f67 is the combined focal length of the sixth lens and the seventh lens, R11 is the curvature radius of the object side surface of the sixth lens, and R14 is the curvature radius of the image side surface of the seventh lens. Satisfying 1.0 < f67 / (R11 + R14) < 4.5 is beneficial to reasonably distribute the optical power of the sixth lens and the seventh lens, and is also beneficial to reducing the overall sensitivity of the lens.

[0064] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0.8 < T12 / (SAG11 + SAG12) < 1.4, where T12 is the distance between the first lens and the second lens on the optical axis, SAG11 is the distance from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens on the optical axis, and SAG12 is the distance from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens on the optical axis. More specifically, T12, SAG11 and SAG12 can further satisfy: 0.8 < T12 / (SAG11 + SAG12) < 1.3. Satisfying 0.8 < T12 / (SAG11 + SAG12) < 1.4 can ensure that the lens has good image quality and can improve the overall processability of the first lens as much as possible, which is beneficial to the subsequent mass production process of the lens.

[0065] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 2.9 < CT2 / (SAG21 - SAG22) < 6.0, where CT2 is the central thickness of the second lens on the optical axis, SAG21 is the distance from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens on the optical axis, and SAG22 is the distance from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens on the optical axis. Satisfying 2.9 < CT2 / (SAG21 - SAG22) < 6.0 can improve the image quality of the lens and is also beneficial to ensuring the overall processability of the second lens.

[0066] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0.5 < (ET4 + ET5) / (ET6 + ET7) < 1.3, where ET4 is the edge thickness of the fourth lens, ET5 is the edge thickness of the fifth lens, ET6 is the edge thickness of the sixth lens, and ET7 is the edge thickness of the seventh lens. More specifically, ET4, ET5, ET6, and ET7 can further satisfy: 0.7 < (ET4 + ET5) / (ET6 + ET7) < 1.3. Satisfying 0.5 < (ET4 + ET5) / (ET6 + ET7) < 1.3 is beneficial to improving the image quality of the lens while enhancing the relative illumination of the edge field of view of the lens, reducing the sensitivity of the last four lenses (the fourth lens to the seventh lens), and ensuring good manufacturability of the last four lenses, which is conducive to the subsequent processing of the lens.

[0067] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 2.0 < TTL / f < 4.0, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens, and f is the total effective focal length of the optical imaging lens. More specifically, TTL and f can further satisfy: 3.5 < TTL / f < 3.9. Satisfying 2.0 < TTL / f < 4.0 is beneficial to shortening the total length TTL of the lens and avoiding problems such as poor comprehensive performance of the lens due to too small ratio of TTL / f.

[0068] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 2.6 < ∑CT / ∑AT < 4.2, where ∑CT is the sum of the central thicknesses of the first lens to the seventh lens on the optical axis, and ∑AT is the sum of the spacing distances between any two adjacent lenses among the first lens to the seventh lens on the optical axis. More specifically, ∑CT and ∑AT can further satisfy: 2.8 < ∑CT / ∑AT < 4.1. Satisfying 2.6 < ∑CT / ∑AT < 4.2 is beneficial to ensuring good image quality of the optical imaging lens while avoiding excessive overall size of the lens, and thus is conducive to maintaining the miniaturized characteristics of the lens.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application further includes an aperture disposed between the second lens and the third lens. Specifically, the optical imaging lens according to the present application can satisfy: 1.2 < SL / (CT3 + CT4 + CT5 + CT6 + CT7) < 1.7, where SL is the distance from the aperture to the imaging surface of the optical imaging lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, SL, CT3, CT4, CT5, CT6, and CT7 can further satisfy: 1.3 < SL / (CT3 + CT4 + CT5 + CT6 + CT7) < 1.6. Satisfying 1.2 < SL / (CT3 + CT4 + CT5 + CT6 + CT7) < 1.7 can improve the overall performance of the lens, avoid the problem of the overall size increase of the lens caused by the excessive thickness of the last five lenses (the third lens to the seventh lens), and at the same time avoid the problem of reduced processability caused by the excessive thinness of the last five lenses.

[0070] In an exemplary embodiment, at least four of the first lens to the fifth lens can be lenses made of plastic material. Using lenses made of plastic material is beneficial to reducing the manufacturing cost of the lens. In an exemplary embodiment, the sixth lens can be a spherical lens made of glass material, that is, the sixth lens can be a lens made of glass material, and both its object side and image side can be aspherical. This setting of the sixth lens is beneficial to improving the imaging quality of the lens. The optical imaging lens provided by the present application can improve the imaging quality of the lens and achieve high-definition imaging on the basis of reducing the production cost by using a hybrid combination of plastic lenses and glass lenses.

[0071] In an exemplary embodiment, the optical imaging lens according to the present application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging lens having characteristics such as a large aperture, low cost, a large target surface, and high imaging quality. The optical imaging lens according to the above embodiment of the present application can adopt multiple lenses, such as the seven lenses mentioned above. By reasonably distributing the optical power, surface type, central thickness of each lens, and the axial spacing between each lens, etc., the incident light can be effectively converged, the optical total length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging lens more conducive to production and processing.

[0072] In an embodiment of the present application, at least one of the mirror surfaces of the first lens to the fifth lens and the seventh 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 fifth lens and the object side surface and the image side surface of the seventh lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens is an aspherical mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are aspherical mirror surfaces.

[0073] However, those skilled in the art should understand that without departing from the technical solutions 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 embodiment, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0074] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0075] Example 1

[0076] The following refers to Figures 1 to 2D Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 A schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0077] As Figure 1 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0078] The first lens E1 has a negative focal power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a positive focal power, with its object side S3 being concave and its image side S4 being convex. The third lens E3 has a positive focal power, with its object side S5 being convex and its image side S6 being convex. The fourth lens E4 has a negative focal power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has a positive focal power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has a positive focal power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has a negative focal power, with its object side S13 being convex and its image side S14 being concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17.

[0079] Table 1 shows the basic parameter table of the optical imaging lens of Example 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0080] Surface Number Surface Type Radius of Curvature Thickness / Distance Refractive Index Abbe Number Material Focal Length Conic Constant OBJ Spherical Surface Infinity Infinity S1 Aspherical Surface 6.8843 1.8000 1.55 56.1 Plastic -19.31 -0.0465 S2 Aspherical Surface 3.7800 3.6035 -1.0873 S3 Aspherical Surface -9.5468 2.6703 1.66 20.4 Plastic 89.96 -1.5929 S4 Aspherical Surface -9.1547 0.0300 -1.0111 STO Spherical Surface Infinity 0.0300 S5 Aspherical Surface 23.8054 4.2711 1.55 56.1 Plastic 12.10 0.0000 S6 Aspherical Surface -8.5630 0.1895 -1.0000 S7 Aspherical Surface 11.5806 2.2483 1.66 20.4 Plastic -11.77 0.0000 S8 Aspherical Surface 4.3102 1.0938 -1.0000 S9 Aspherical Surface 18.7777 4.1725 1.54 55.7 Plastic 14.31 1.2403 S10 Aspherical Surface -11.9905 0.0597 1.2049 S11 Spherical Surface 13.3771 3.8786 1.62 60.4 Glass 12.66 S12 Spherical Surface -17.0417 0.1258 S13 Aspherical Surface 9.0273 1.6755 1.67 19.2 Plastic -20.55 0.0000 S14 Aspherical Surface 5.0660 1.2865 -1.0000 S15 Spherical Surface Infinity 0.2100 1.52 64.2 Glass S16 Spherical Surface Infinity 3.0974 S17 Spherical Surface Infinity

[0081] Table 1

[0082] In this example, the total effective focal length f of the optical imaging lens is 8.04 mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens) is 30.44 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens ImgH is 4.55 mm, and the maximum field of view angle FOV of the optical imaging lens is 65.9°.

[0083] In Example 1, the object sides and image sides of any one of the first lens E1 to the fifth lens E5 and the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0084]

[0085] where x is the sagitta, the distance from the vertex of the aspherical surface at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A20 。

[0086]

[0087]

[0088] Table 2

[0089] Figure 2A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the optical imaging lens of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2C shows the distortion curve of the optical imaging lens of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 1, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 2A to 2D it can be seen that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0090] Example 2

[0091] The following refers to Figures 3 to 4D to describe the optical imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application.

[0092] As Figure 3 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0093] The first lens E1 has a negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a positive optical power, with its object side S3 being concave and its image side S4 being convex. The third lens E3 has a positive optical power, with its object side S5 being convex and its image side S6 being convex. The fourth lens E4 has a negative optical power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has a positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has a positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has a negative optical power, with its object side S13 being convex and its image side S14 being concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0094] In this example, the total effective focal length f of the optical imaging lens is 8.57 mm, the total length TTL of the optical imaging lens is 31.00 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens is ImgH = 4.70 mm, and the maximum field angle FOV of the optical imaging lens is 66.9°.

[0095] Table 3 shows the basic parameter table of the optical imaging lens of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 2, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0096]

[0097]

[0098] Table 3

[0099] Surface Number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.0101E-04 -4.0083E-05 -5.4368E-07 1.1431E-07 -3.4826E-09 4.2332E-11 2.9842E-14 -3.6731E-15 0.0000E+00 S2 -4.3555E-04 -1.0413E-04 7.8312E-07 1.8429E-07 -6.0260E-09 -1.3517E-11 2.7489E-12 0.0000E+00 0.0000E+00 S3 5.0874E-04 -2.9148E-05 -2.9529E-06 2.5356E-07 -1.5975E-08 4.0552E-10 -1.3888E-12 -1.2970E-14 0.0000E+00 S4 1.6988E-03 -1.3506E-04 7.2775E-06 -2.7970E-07 6.3225E-09 -5.2863E-11 -3.6349E-13 1.5454E-14 -2.5082E-16 S5 1.7980E-03 -2.3073E-04 1.5290E-05 -7.4818E-07 2.4830E-08 -4.6037E-10 3.5251E-12 0.0000E+00 0.0000E+00 S6 6.2051E-04 -7.3071E-05 4.8700E-06 -3.0195E-07 1.2095E-08 -2.4658E-10 1.9644E-12 0.0000E+00 0.0000E+00 S7 -3.2244E-03 1.4213E-04 -1.3263E-06 -3.4023E-07 2.3376E-08 -7.0679E-10 1.0597E-11 -6.4211E-14 0.0000E+00 S8 -5.4617E-03 3.3126E-04 -1.5143E-05 4.9114E-07 -1.2111E-08 2.3763E-10 -3.0998E-12 1.8084E-14 0.0000E+00 S9 -2.9621E-04 -1.4627E-05 4.7528E-06 -3.1743E-07 9.5336E-09 -1.2764E-10 4.9926E-13 1.8057E-15 0.0000E+00 S10 7.6085E-04 -5.3113E-06 3.9635E-07 -1.6451E-08 3.7523E-10 -2.8915E-12 -1.2554E-14 2.2279E-16 0.0000E+00 S13 -9.7923E-04 5.8732E-05 -2.8234E-06 1.1049E-07 -2.6450E-09 3.1937E-11 -1.4103E-13 0.0000E+00 0.0000E+00 S14 -2.2646E-03 1.1073E-04 -2.3735E-06 -9.4749E-08 1.3108E-08 -4.0683E-10 1.2493E-12 1.1336E-13 0.0000E+00

[0100] Table 4

[0101] Figure 4A Shows the axial chromatic aberration curve of the optical imaging lens of Example 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4B Shows the astigmatism curve of the optical imaging lens of Example 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C Shows the distortion curve of the optical imaging lens of Example 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4D Shows the longitudinal chromatic aberration curve of the optical imaging lens of Example 2, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 4A to 4DIt can be seen that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following refers to Figures 5 to 6D and describes an optical imaging lens according to Embodiment 3 of the present application. Figure 5 FIG. shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application.

[0104] As Figure 5 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0105] The first lens E1 has a negative focal power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive focal power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative focal power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive focal power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive focal power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative focal power, 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. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0106] In this example, the total effective focal length f of the optical imaging lens is 8.68 mm, the total length TTL of the optical imaging lens is 31.00 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens is ImgH = 4.55 mm, and the maximum field of view FOV of the optical imaging lens is 63.0°.

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

[0108] Surface Number Surface Type Radius of Curvature Thickness / Distance Refractive Index Abbe Number Material Focal Length Conic Constant OBJ Spherical Surface Infinity Infinity S1 Aspherical Surface 5.1547 1.7000 1.55 56.1 Plastic -24.77 -0.9944 S2 Aspherical Surface 3.2973 4.7677 -0.9845 S3 Aspherical Surface -10.9781 3.2491 1.57 37.3 Plastic 26.18 0.3467 S4 Aspherical Surface -7.0071 0.0599 -0.0007 STO Spherical Surface Infinity 0.5833 S5 Aspherical Surface 48.1656 3.0500 1.53 55.5 Glass 42.08 0.4111 S6 Aspherical Surface -41.3782 0.0300 38.9948 S7 Aspherical Surface 9.6685 1.9000 1.66 20.4 Plastic -17.07 0.1937 S8 Aspherical Surface 4.8178 0.8081 -0.8895 S9 Aspherical Surface 17.2385 4.1385 1.55 56.1 Plastic 10.52 -0.1157 S10 Aspherical Surface -7.8831 0.0600 0.0003 S11 Spherical Surface 11.8370 3.5010 1.74 44.9 Glass 12.83 S12 Spherical Surface -43.9571 0.0300 S13 Aspherical Surface 36.5496 1.6000 1.67 19.2 Plastic -11.90 0.0000 S14 Aspherical Surface 6.4907 1.4673 0.0000 S15 Spherical Surface Infinity 0.7000 1.52 64.2 Glass S16 Spherical Surface Infinity 3.3552 S17 Spherical Surface Infinity

[0109] Table 5

[0110] Surface Number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.6487E-04 -2.1420E-05 -2.1443E-06 2.2429E-07 -8.3077E-09 1.4142E-10 1.8816E-13 -4.5847E-14 5.0667E-16 S2 -6.6451E-04 -6.3191E-05 -4.1696E-06 5.4689E-07 -7.6202E-09 -1.7420E-09 1.2754E-10 -3.6377E-12 3.9100E-14 S3 4.6619E-04 -4.5618E-05 1.8678E-06 -9.0089E-07 1.4910E-07 -1.3633E-08 7.0350E-10 -1.9023E-11 2.0959E-13 S4 2.5437E-03 -3.0383E-04 2.4081E-05 -1.1055E-06 -3.9458E-09 4.2311E-09 -2.8153E-10 9.3125E-12 -1.6108E-13 S5 2.7101E-03 -4.2170E-04 3.8094E-05 -2.5599E-06 1.1877E-07 -3.5194E-09 6.3201E-11 -6.3178E-13 2.7414E-15 S6 5.8656E-04 -4.9745E-05 1.7842E-06 -2.3469E-07 1.6566E-08 -4.4573E-10 2.5380E-12 7.7300E-14 -9.7060E-16 S7 -3.2931E-03 1.6928E-04 -3.3619E-06 -4.4127E-07 4.1447E-08 -1.5937E-09 3.1847E-11 -3.2181E-13 1.2871E-15 S8 -5.6827E-03 3.6938E-04 -1.8565E-05 6.6745E-07 -1.6340E-08 2.2331E-10 1.1244E-13 -4.9011E-14 4.6419E-16 S9 -4.1301E-04 -8.6093E-06 5.3898E-06 -4.8149E-07 2.5199E-08 -9.1811E-10 2.2553E-11 -3.1809E-13 1.8764E-15 S10 8.4876E-04 -7.2528E-06 3.8526E-07 -5.2317E-09 -1.3937E-09 1.2120E-10 -4.4628E-12 8.1078E-14 -5.8957E-16 S13 -1.0199E-03 6.2424E-05 -3.0625E-06 1.2231E-07 -2.9880E-09 3.6820E-11 -1.6593E-13 0.0000E+00 0.0000E+00 S14 -2.4290E-03 1.2300E-04 -2.7305E-06 -1.1289E-07 1.6174E-08 -5.1989E-10 1.6533E-12 1.5538E-13 0.0000E+00

[0111] Table 6

[0112] Figure 6A shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6B shows the astigmatism curve of the optical imaging lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C shows the distortion curve of the optical imaging lens of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6D shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of different image heights on the imaging plane after light rays pass through the lens. According to Figures 6A to 6D it can be seen that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0113] Example 4

[0114] The following refers to Figures 7 to 8D describes the optical imaging lens according to Embodiment 4 of the present application. Figure 7 shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application.

[0115] As Figure 7 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0116] The first lens E1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a positive optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface. The third lens E3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a convex surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a negative optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a concave surface. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0117] In this example, the total effective focal length f of the optical imaging lens is 8.41 mm, the total length TTL of the optical imaging lens is 31.00 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens is ImgH = 4.21 mm, and the maximum field angle FOV of the optical imaging lens is 57.8°.

[0118] Table 7 shows the basic parameter table of the optical imaging lens of Example 4. Among them, the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the high-order term coefficients of each aspherical mirror surface that can be used in Example 4. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0119] Surface Number Surface Type Radius of Curvature Thickness / Distance Refractive Index Abbe Number Material Focal Length Conic Constant OBJ Spherical Surface Infinity Infinity S1 Aspherical Surface 5.4837 1.7000 1.55 56.1 Plastic -29.21 -1.0000 S2 Aspherical Surface 3.6339 5.7882 -1.0000 S3 Aspherical Surface -10.6308 3.1817 1.58 40.9 Glass 25.46 0.0000 S4 Aspherical Surface -6.8834 0.1018 0.0000 STO Spherical Surface Infinity 0.0300 S5 Aspherical Surface 46.5748 3.1795 1.54 55.7 Plastic 44.78 -34.7216 S6 Aspherical Surface -48.4803 0.0300 49.8240 S7 Aspherical Surface 9.7909 1.9000 1.66 20.4 Plastic -17.16 0.0978 S8 Aspherical Surface 4.8639 0.7396 -0.9242 S9 Aspherical Surface 20.9719 3.8222 1.55 56.1 Plastic 11.05 0.0000 S10 Aspherical Surface -7.9267 0.0600 0.0000 S11 Spherical Surface 10.5425 3.6480 1.80 46.6 Glass 12.36 S12 Spherical Surface -156.8579 0.0300 S13 Aspherical Surface 186.6232 1.8607 1.67 19.2 Plastic -11.50 0.0000 S14 Aspherical Surface 7.4519 1.2081 0.0000 S15 Spherical Surface Infinity 0.7000 1.52 64.2 Glass S16 Spherical Surface Infinity 3.0209 S17 Spherical Surface Infinity

[0120] Table 7

[0121] Surface Number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -5.6889E-04 -1.4141E-05 -8.4432E-07 6.1166E-08 -1.3202E-09 1.1944E-11 3.8922E-15 -5.4098E-16 0.0000E+00 S2 -2.2903E-04 -6.2647E-05 3.8438E-06 -4.1939E-07 2.8712E-08 -9.1987E-10 1.1593E-11 0.0000E+00 0.0000E+00 S3 1.6050E-05 3.8858E-06 -2.2062E-06 3.8802E-08 -1.1680E-09 7.1747E-11 -3.6863E-12 8.8652E-14 0.0000E+00 S4 1.1484E-03 -4.5102E-05 1.4311E-06 -5.0907E-08 7.7757E-10 6.5921E-11 -4.2679E-12 1.1758E-13 -1.7092E-15 S5 9.3712E-04 -8.0882E-05 3.3767E-06 -1.5441E-07 6.1741E-09 -1.3077E-10 1.0482E-12 0.0000E+00 0.0000E+00 S6 5.6313E-04 8.2692E-07 -4.8206E-06 2.4558E-07 -4.4939E-09 2.0450E-11 1.5883E-13 0.0000E+00 0.0000E+00 S7 -3.0635E-03 1.6110E-04 -6.4001E-06 2.9822E-08 8.5549E-09 -3.4380E-10 5.4893E-12 -3.2574E-14 0.0000E+00 S8 -5.6444E-03 3.4570E-04 -1.6645E-05 5.9565E-07 -1.6591E-08 3.4941E-10 -4.5775E-12 2.6262E-14 0.0000E+00 S9 2.7076E-04 -4.2067E-05 4.7861E-06 -2.8556E-07 8.6098E-09 -1.1772E-10 4.7399E-13 1.6412E-15 0.0000E+00 S10 1.1996E-03 -2.7322E-05 8.5899E-07 -2.9068E-08 9.7938E-10 -1.5201E-11 4.2387E-14 6.3761E-16 0.0000E+00 S13 6.5285E-04 -9.5233E-05 6.8784E-06 -2.5070E-07 4.9084E-09 -5.2092E-11 2.8194E-13 0.0000E+00 0.0000E+00 S14 -1.1576E-04 -3.0949E-05 9.8102E-06 -7.4577E-07 4.6500E-08 -8.1675E-10 -6.2553E-11 2.5578E-12 0.0000E+00

[0122] Table 8

[0123] Figure 8A shows the axial chromatic aberration curve of the optical imaging lens of Example 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the optical imaging lens of Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C shows the distortion curve of the optical imaging lens of Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D shows the lateral chromatic aberration curve of the optical imaging lens of Example 4, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 8A to 8D it can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0124] Example 5

[0125] The following refers to Figures 9 to 10D describes the optical imaging lens according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application.

[0126] As Figure 9 shown, the optical imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0127] The first lens E1 has a negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a positive optical power, with its object side S3 being concave and its image side S4 being convex. The third lens E3 has a positive optical power, with its object side S5 being convex and its image side S6 being convex. The fourth lens E4 has a negative optical power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has a positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has a positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has a negative optical power, with its object side S13 being convex and its image side S14 being concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17.

[0128] In this example, the total effective focal length f of the optical imaging lens is 8.54 mm, the total length TTL of the optical imaging lens is 32.49 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens is ImgH = 5.00 mm, and the maximum field angle FOV of the optical imaging lens is 70.4°.

[0129] Table 9 shows the basic parameter table of the optical imaging lens of Example 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 10 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Example 5, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0130]

[0131]

[0132] Table 9

[0133] Surface Number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -7.1686E-04 -3.3935E-05 -4.3544E-07 8.6613E-08 -2.4962E-09 2.8704E-11 1.9142E-14 -2.2289E-15 0.0000E+00 S2 -3.7897E-04 -8.4517E-05 5.9287E-07 1.3014E-07 -3.9694E-09 -8.3054E-12 1.5755E-12 0.0000E+00 0.0000E+00 S3 4.8688E-04 -2.7290E-05 -2.7046E-06 2.2719E-07 -1.4003E-08 3.4774E-10 -1.1651E-12 -1.0644E-14 0.0000E+00 S4 1.6596E-03 -1.3042E-04 6.9456E-06 -2.6385E-07 5.8950E-09 -4.8717E-11 -3.3109E-13 1.3914E-14 -2.2320E-16 S5 1.3776E-03 -1.7274E-04 1.1015E-05 -5.3022E-07 1.7270E-08 -3.1082E-10 2.2708E-12 0.0000E+00 0.0000E+00 S6 2.5519E-04 1.4110E-05 -3.1621E-06 1.2741E-07 -1.8679E-09 2.7373E-12 1.0755E-13 0.0000E+00 0.0000E+00 S7 -2.7291E-03 1.5462E-04 -6.2717E-06 8.8113E-08 2.7585E-09 -1.3150E-10 1.9744E-12 -1.0583E-14 0.0000E+00 S8 -4.6559E-03 2.6200E-04 -1.1238E-05 3.3035E-07 -6.9279E-09 1.1010E-10 -1.1979E-12 6.1824E-15 0.0000E+00 S9 -2.3907E-04 -1.0606E-05 3.0960E-06 -1.8577E-07 5.0124E-09 -6.0291E-11 2.1186E-13 6.8839E-16 0.0000E+00 S10 8.2221E-04 -5.9665E-06 4.6285E-07 -1.9970E-08 4.7352E-10 -3.7931E-12 -1.7121E-14 3.1584E-16 0.0000E+00 S13 -9.3375E-04 5.4688E-05 -2.5672E-06 9.8105E-08 -2.2933E-09 2.7040E-11 -1.1660E-13 0.0000E+00 0.0000E+00 S14 -2.2736E-03 1.1139E-04 -2.3925E-06 -9.5695E-08 1.3266E-08 -4.1253E-10 1.2693E-12 1.1541E-13 0.0000E+00

[0134] Table 10

[0135] Figure 10A Shows the axial chromatic aberration curve of the optical imaging lens of Example 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10B Shows the astigmatism curve of the optical imaging lens of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10C Shows the distortion curve of the optical imaging lens of Example 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10D Shows the lateral chromatic aberration curve of the optical imaging lens of Example 5, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 10A to 10DIt can be seen that the optical imaging lens given in Embodiment 5 can achieve good imaging quality.

[0136] In summary, Embodiments 1 to 5 respectively satisfy the relationships shown in Table 11.

[0137] Condition / Example 1 2 3 4 5 f / EPD 0.95 1.05 1.05 0.94 0.95 TTL / f 3.79 3.62 3.57 3.68 3.80 f1 / f -2.40 -2.85 -2.85 -3.47 -3.00 f4 / f7 0.57 1.32 1.43 1.49 1.54 (f5 + f6) / f3 2.23 0.43 0.55 0.52 0.36 (R1 + R2) / (R3 + R4) -0.57 -0.45 -0.47 -0.52 -0.50 R7 / R8 2.69 2.02 2.01 2.01 1.91 (R9 + R10) / (R9 - R10) 0.22 0.40 0.37 0.45 0.39 ∑CT / ∑AT 4.04 3.08 3.02 2.85 3.15 SL / (CT3 + CT4 + CT5 + CT6 + CT7) 1.38 1.55 1.50 1.40 1.50 f67 / (R11 + R14) 1.16 2.26 4.36 3.52 2.25 T12 / (SAG11 + SAG12) 0.91 0.97 1.11 1.21 0.95 CT2 / (SAG21 - SAG22) 5.83 3.68 3.60 3.40 3.03 (ET4 + ET5) / (ET6 + ET7) 1.18 0.96 0.99 0.82 0.76

[0138] Table 11

[0139] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0140] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having positive refractive power, whose object-side surface is concave and whose image-side surface is convex; The third lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; a fourth lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a fifth lens element having positive optical power, with a convex object-side surface and a convex image-side surface; a sixth lens element having positive optical power, with its object-side surface being convex and its image-side surface being convex; and a seventh lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; The number of lenses having optical power in the optical imaging lens is seven; At least four lenses from the first lens to the fifth lens are made of plastic; The sixth lens is a spherical lens made of glass; and The combined focal length f67 of the sixth lens and the seventh lens, the curvature radius R11 of the object-side surface of the sixth lens, and the curvature radius R14 of the image-side surface of the seventh lens satisfy: 1.16≤f67 / (R11+R14)≤4.

36.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy the following: -3.47≤f1 / f≤-2.

40.

3. The optical imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy the following: 0.57≤f4 / f7≤1.

54.

4. The optical imaging lens according to claim 1, wherein: The effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy the following: 0.36≤(f5+f6) / f3≤2.

23.

5. The optical imaging lens according to claim 1, wherein: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first 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 satisfy: -0.57≤(R1+R2) / (R3+R4)≤-0.

45.

6. The optical imaging lens according to claim 1, wherein: A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 1.91≤R7 / R8≤2.

69.

7. The optical imaging lens according to claim 1, wherein: A curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 0.22≤(R9+R10) / (R9-R10)≤0.

45.

8. The optical imaging lens according to claim 1, wherein: The spacing distance T12 between the first lens and the second lens on the optical axis, the distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens on the optical axis, and the distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens on the optical axis satisfy: 0.91≤T12 / (SAG11+SAG12)≤1.

21.

9. The optical imaging lens according to claim 1, wherein: The center thickness CT2 of the second lens on the optical axis, the distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens on the optical axis, and the distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens on the optical axis satisfy: 3.03≤CT2 / (SAG21-SAG22)≤5.

83.

10. The optical imaging lens according to claim 1, wherein: An edge thickness ET4 of the fourth lens, an edge thickness ET5 of the fifth lens, an edge thickness ET6 of the sixth lens, and an edge thickness ET7 of the seventh lens satisfy the following: 0.76≤(ET4+ET5) / (ET6+ET7)≤1.

18.

11. The optical imaging lens according to any one of claims 1 to 10, wherein: A distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and a total effective focal length f of the optical imaging lens satisfy the following: 3.57≤TTL / f≤3.

80.

12. The optical imaging lens according to any one of claims 1 to 10, wherein: The sum ΣCT of the center thicknesses of the first to seventh lenses on the optical axis and the sum ΣAT of the spacing distances between any two adjacent lenses from the first to seventh lenses on the optical axis satisfy the following: 2.85≤ΣCT / ΣAT≤4.

04.

13. The optical imaging lens according to any one of claims 1 to 10, wherein: The optical imaging lens further includes a diaphragm, A distance SL from the aperture to the imaging plane of the optical imaging lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy the following conditions: 1.38≤SL / (CT3+CT4+CT5+CT6+CT7)≤1.55.

Images