Optical imaging system

Abstract

The present application discloses an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a second lens with negative focal power, whose object side surface is convex and whose image side surface is concave; a third lens with focal power; a fourth lens with focal power; a fifth lens with negative focal power; a sixth lens with positive focal power, whose object side surface is convex and whose image side surface is concave; and a seventh lens with negative focal power. The optical imaging system satisfies the following: 40<V1 / (Fno×TD / ImgH)<53, where V1 is the Abbe number of the first lens, Fno is the aperture number of the optical imaging system, TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system.

Description

Technical Field

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

[0002] With the increasing popularity of portable electronic devices such as smartphones and tablets, more and more consumers prefer to use smartphones for photography. To meet the needs of many consumers in different shooting environments, the functions of optical imaging systems installed in smartphones are becoming increasingly diverse, which has led to increasingly fierce competition in the optical imaging system market.

[0003] Typically, the main optical imaging system in high-end smartphones requires features such as a large aperture, large image area, ultra-thin design, and high image quality. However, when shooting in environments with large temperature differences, minimizing the impact of these differences on image quality and improving the thermal performance of the optical imaging system are current development trends in optical imaging systems. Summary of the Invention

[0004] On the one hand, the present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object-side surface is convex and whose image-side surface is concave; a second lens with negative optical power, whose object-side surface is convex and whose image-side surface is concave; a third lens with optical power; a fourth lens with optical power; a fifth lens with negative optical power; a sixth lens with positive optical power, whose object-side surface is convex and whose image-side surface is concave; and a seventh lens with negative optical power; wherein the optical imaging system can satisfy: 40<V1 / (Fno×TD / ImgH)<53, wherein V1 is the Abbe number of the first lens, Fno is the aperture number of the optical imaging system, TD is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system.

[0005] 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.

[0006] In one embodiment, the optical imaging system may satisfy: 1<(f2-f1) / (f2+f1)<2, where f2 is the effective focal length of the second lens, and f1 is the effective focal length of the first lens.

[0007] In one embodiment, the optical imaging system may satisfy: -1.5<f3 / f4<-0.5, where f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0008] In one embodiment, the optical imaging system may satisfy: 0.5<(R10-R9) / f5<2.5, where R9 is the curvature radius of the object side surface of the fifth lens, R10 is the curvature radius of the image side surface of the fifth lens, and f5 is the effective focal length of the fifth lens.

[0009] In one embodiment, the optical imaging system may satisfy: 3.4<f67 / (CT6+T67+CT7)<8, where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the center thickness of the sixth lens on the optical axis, T67 is the air spacing between the sixth lens and the seventh lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0010] In one embodiment, the optical imaging system may satisfy: 2<(R1+R2) / EPD<4, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and EPD is the entrance pupil diameter of the optical imaging system.

[0011] In one embodiment, the optical imaging system may satisfy: 2<(R3+R4) / f<6, where R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, and f is the total effective focal length of the optical imaging system.

[0012] In one embodiment, the optical imaging system may satisfy: 4<f1234 / (CT1+CT4)<6, where f1234 is the combined focal length of the first lens, the second lens, the third lens, and the fourth lens, CT1 is the center thickness of the first lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

[0013] In one embodiment, the optical imaging system may satisfy: 0.5<(R5 / R6)×(SAG21 / SAG22)<2.5, wherein R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, SAG21 is the distance 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 SAG22 is the distance 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.

[0014] In one embodiment, the optical imaging system may satisfy: 15<R7 / (T34+CT4)<51, where R7 is the radius of curvature of the object side surface of the fourth lens, T34 is the air spacing between the third lens and the fourth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

[0015] In one embodiment, the optical imaging system may satisfy: -1.7<R11 / (SAG51+SAG52)<-0.7, where R11 is the curvature radius of the object side surface of the sixth lens, SAG51 is the distance from 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 on the optical axis, and SAG52 is the distance from 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 on the optical axis.

[0016] In one embodiment, the optical imaging system may satisfy: -24<f45 / (T45+CT5)<-8, where f45 is the combined focal length of the fourth lens and the fifth lens, T45 is the air spacing between the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0017] This application reasonably sets the optical focal length and surface characteristics of each lens and combines 40<V1 / (Fno×TD / ImgH)<53, which can not only reduce tolerance sensitivity, reduce off-axis aberrations, and improve the resolution of the optical imaging system, but also make the optical imaging system have ultra-thin, large aperture and other characteristics. It can also reasonably control the degree of dispersion of the system, improve the system's ability to correct chromatic aberration and temperature adaptability, and achieve better imaging effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 1 shows a schematic structural diagram of an optical imaging system according to Example 1 of the present application;

[0020] Figures 2A to 2D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

[0021] Figure 3 1 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application;

[0022] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

[0023] Figure 5 1 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application;

[0024] 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 3 are respectively shown;

[0025] Figure 7 Schematic diagram of the structure of an optical imaging system according to Example 4 of the present application is shown;

[0026] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 4 are respectively shown;

[0027] Figure 9 1 shows a schematic structural diagram of an optical imaging system according to Example 5 of the present application;

[0028] 10A to 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0029] Figure 11 shows a schematic structural diagram of an optical imaging system according to Example 6 of the present application; and

[0030] 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown. DETAILED DESCRIPTION

[0031] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely 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.

[0032] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0033] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0034] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0035] 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 preclude 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 list of 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.

[0036] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled 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 consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0038] The features, principles and other aspects of the present application are described in detail below.

[0039] An optical imaging system according to an exemplary embodiment of the present application may include seven lenses having 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 sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first through seventh lenses may be spaced apart by a distance.

[0040] In an exemplary embodiment of the present application, the first lens may have positive optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave; the second lens may have negative optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave; the third lens may have positive optical power or negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have negative optical power; the sixth lens may have positive optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave; and the seventh lens may have negative optical power.

[0041] In the present application, by reasonably setting the optical focal length and surface features of each lens, it is beneficial to improve the imaging quality of the optical imaging system. For example, by reasonably setting the optical focal length of the two lenses in front of the system (i.e., the first lens and the second lens) and the three lenses in the back (i.e., the fifth lens, the sixth lens, and the seventh lens), the amount of astigmatism generated by the front-end optics and the back-end optics of the system can be effectively balanced, the tolerance sensitivity can be reduced, and the system can have good imaging quality. By reasonably setting the surface shape of the two lenses in front of the system (i.e., the first lens and the second lens), the range of the incident light can be reasonably limited, the light with poor edge quality can be eliminated, the off-axis aberration can be reduced, and the resolution of the optical imaging system can be effectively improved. By reasonably setting the surface shape of the sixth lens, the deflection angle of the light path can be avoided from being too large, which is beneficial to improving the overall performance of the system.

[0042] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following: 40<V1 / (Fno×TD / ImgH)<53, wherein V1 is the Abbe number of the first lens, Fno is the aperture number of the optical imaging system, TD is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system. In the present application, by reasonably setting the optical focal length and surface characteristics of each lens, and combining 40<V1 / (Fno×TD / ImgH)<53, it is possible to reduce the tolerance sensitivity, reduce off-axis aberrations, and improve the resolution of the optical imaging system, and enable the optical imaging system to have characteristics such as ultra-thinness and large aperture. It is also possible to reasonably control the degree of dispersion of the system, improve the system's ability to correct chromatic aberrations and temperature adaptability, and achieve better imaging effects.

[0043] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 1 < (f2 - f1) / (f2 + f1) < 2, where f2 is the effective focal length of the second lens, and f1 is the effective focal length of the first lens. Satisfying 1 < (f2 - f1) / (f2 + f1) < 2 allows for a reasonable allocation of the effective focal lengths of the first and second lenses to reduce the deflection angle of light and improve the imaging quality of the optical imaging system.

[0044] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following relationship: -1.5 < f3 / f4 < -0.5, where f3 is the effective focal length of the third lens element and f4 is the effective focal length of the fourth lens element. By controlling the effective focal length ratio of the third and fourth lenses within a reasonable range, the spherical aberration contributions of the third and fourth lenses can be reasonably controlled to within a reasonable level, thereby achieving good imaging quality in the system's on-axis field of view.

[0045] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 0.5 < (R10 - R9) / f5 < 2.5, where R9 is the radius of curvature of the object-side surface of the fifth lens element, R10 is the radius of curvature of the image-side surface of the fifth lens element, and f5 is the effective focal length of the fifth lens element. Satisfying 0.5 < (R10 - R9) / f5 < 2.5 allows the deflection angle of the peripheral field of view at the fifth lens element to be properly controlled by controlling the ratio of the radius of curvature of the object-side and image-side surfaces of the fifth lens element to the effective focal length within a certain range, effectively reducing the sensitivity of the system.

[0046] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following condition: 3.4 < f67 / (CT6 + T67 + CT7) < 8, where f67 is the combined focal length of the sixth and seventh lenses, CT6 is the center thickness of the sixth lens on the optical axis, T67 is the air gap between the sixth and seventh lenses on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis. Satisfying 3.4 < f67 / (CT6 + T67 + CT7) < 8 allows the spherical aberration contribution of the sixth and seventh lenses to be properly controlled by controlling the ratio of the combined focal length of the sixth and seventh lenses to the sum of their center thicknesses on the optical axis and the air gap within a certain range, thereby achieving good imaging quality.

[0047] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following condition: 2 < (R1 + R2) / EPD < 4, where R1 is the radius of curvature of the object-side surface of the first lens element, R2 is the radius of curvature of the image-side surface of the first lens element, and EPD is the entrance pupil diameter of the optical imaging system. Satisfying 2 < (R1 + R2) / EPD < 4 allows for limiting the angle of incident light by reasonably constraining the ratio of the radii of curvature of the object-side and image-side surfaces of the first lens element to the entrance pupil diameter of the system, thereby improving the processability of the first lens element and facilitating mass production.

[0048] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 2<(R3+R4) / f<6, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, and f is the total effective focal length of the optical imaging system. Satisfying 2<(R3+R4) / f<6 allows the system's third-order coma to be controlled within a reasonable range by properly controlling the ratio of the sum of the radii of curvature of the object-side and image-side surfaces of the second lens to the total effective focal length of the system. This, in turn, helps balance the amount of coma generated by the front-end lens of the optical imaging system, resulting in good imaging quality for the system.

[0049] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following condition: 4 < f1234 / (CT1 + CT4) < 6, where f1234 is the combined focal length of the first, second, third, and fourth lenses, CT1 is the center thickness of the first lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. Satisfying 4 < f1234 / (CT1 + CT4) < 6 allows for the optimal distribution of the focal power of each lens by controlling the ratio of the combined focal length of the first four lenses to the sum of the center thicknesses of the first and fourth lenses on the optical axis, thereby reducing off-axis aberrations and improving the system's aberration correction capabilities.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 0.5<(R5 / R6)×(SAG21 / SAG22)<2.5, wherein R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, 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 0.5<(R5 / R6)×(SAG21 / SAG22)<2.5 can ensure that the shape and processability of the second and third lenses are at an optimal level by controlling the radius of curvature of the object side surface and image side surface of the third lens and the sagittal height of the object side surface and image side surface of the second lens within a certain range, while also effectively reducing the spherical aberration, coma, and astigmatism generated by the system.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following condition: 15 < R7 / (T34 + CT4) < 51, where R7 is the radius of curvature of the object-side surface of the fourth lens, T34 is the air spacing on the optical axis between the third and fourth lenses, and CT4 is the center thickness of the fourth lens on the optical axis. Satisfying 15 < R7 / (T34 + CT4) < 51 allows the field curvature contribution of each field of view to be controlled within a reasonable range by properly controlling the radius of curvature of the object-side surface of the fourth lens, the air spacing on the optical axis between the third and fourth lenses, and the center thickness of the fourth lens on the optical axis.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: -1.7<R11 / (SAG51+SAG52)<-0.7, wherein R11 is the radius of curvature of the object side surface of the sixth lens, SAG51 is the distance on the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens, and SAG52 is the distance on the optical axis from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens. When -1.7<R11 / (SAG51+SAG52)<-0.7 is satisfied, the processing and molding of the fifth lens can be improved, the sensitivity can be reduced, and the imaging effect of the system can be improved by controlling the radius of curvature of the object side surface of the fifth lens and the sagittal height of its object side surface and image side surface within a reasonable range.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following condition: -24 < f45 / (T45 + CT5) < -8, where f45 is the combined focal length of the fourth and fifth lenses, T45 is the air spacing between the fourth and fifth lenses on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis. Satisfying the condition -24 < f45 / (T45 + CT5) < -8 allows the deflection angle of the peripheral field of view at the fifth lens to be controlled by limiting the ratio of the combined focal length of the fourth and fifth lenses to the sum of the air spacing between the fourth and fifth lenses on the optical axis and the center thickness of the fifth lens within a certain range, effectively reducing the sensitivity of the system.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may further include an aperture located between the object side and the first lens. Optionally, the optical imaging system also includes 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 system with the characteristics of a large image surface, a large aperture, ultra-thinness, good temperature performance, and high imaging quality. The optical imaging system can use a mix of glass lenses and plastic lenses to enable the optical imaging system to have characteristics such as small changes in back focus and focal length with temperature and better optical performance while having a lower cost. The optical imaging system according to the above embodiment of the present application can use multiple lenses, such as the seven lenses mentioned above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and axial spacing between each lens, the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging system more conducive to production and processing. At the same time, since the optical imaging system has the characteristics of ultra-large image surface, ultra-large field of view, and small distortion, the optical imaging system can capture a wider field of view, with small distortion at the edge of the picture and high imaging quality.

[0055] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the 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. The characteristic of an 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, with the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side 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.

[0056] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses comprising the optical imaging system can be varied to achieve the various results and advantages described herein. For example, although seven lenses are described as an example in the embodiments, the optical imaging system is not limited to including seven lenses. If desired, the optical imaging system may also include other numbers of lenses.

[0057] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0058] Example 1

[0059] The following reference Figures 1 to 2D An optical imaging system according to Example 1 of the present application is described. Figure 1 A structural schematic diagram of an optical imaging system according to Example 1 of the present application is shown.

[0060] like Figure 1 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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.

[0061] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0062] Table 1 shows the basic parameters of the optical imaging system of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0063]

[0064]

[0065] Table 1

[0066] In this example, the total effective focal length f of the optical imaging system is 5.36 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.740 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.24 mm.

[0067] 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. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0068]

[0069] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface 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 conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 give 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, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A80, A81, A9, A10, A11, A12, A13, A14, A15 10 、A 12 、A 14 、A 16 、A 18 、A 20、A 22 、A 24 、A 26 、A 28 and A 30 .

[0070]

[0071]

[0072] Table 2-1

[0073] Face number A18 A20 A22 A24 A26 A28 A30 S1 9.1455E-05 -6.0339E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 2.0799E-02 -5.5836E-03 8.5812E-04 -5.7673E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.6360E-02 -1.6889E-02 2.9028E-03 -2.1831E-04 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.0668E+00 5.1409E-01 -1.5923E-01 2.8624E-02 -2.2672E-03 0.0000E+00 0.0000E+00 S5 -7.6361E-01 2.1140E+00 -1.7338E+00 8.0907E-01 -2.2812E-01 3.6341E-02 -2.5225E-03 S6 -5.5627E-01 7.1121E-01 -4.2002E-01 1.5131E-01 -3.3870E-02 4.3415E-03 -2.4396E-04 S7 6.2234E-01 -3.0849E-01 1.3169E-01 -4.1302E-02 8.4539E-03 -9.9644E-04 5.1191E-05 S8 4.3608E-01 -2.2696E-01 8.2200E-02 -2.0278E-02 3.2451E-03 -3.0326E-04 1.2535E-05 S9 -8.7838E-02 2.3956E-02 -4.2741E-03 4.4011E-04 -1.5034E-05 -1.4323E-06 1.1931E-07 S10 -2.9796E-02 8.6049E-03 -1.7375E-03 2.4043E-04 -2.1703E-05 1.1500E-06 -2.7115E-08 S11 1.4214E-03 -2.0336E-04 2.0561E-05 -1.4358E-06 6.5902E-08 -1.7897E-09 2.1798E-11 S12 -3.2054E-04 3.4853E-05 -2.7199E-06 1.4765E-07 -5.2577E-09 1.0941E-10 -9.9493E-13 S13 -2.0277E-05 1.4780E-06 -7.7651E-08 2.8661E-09 -7.0550E-11 1.0401E-12 -6.9486E-15 S14 -1.1054E-05 8.2178E-07 -4.4169E-08 1.6680E-09 -4.1926E-11 6.2905E-13 -4.2588E-15

[0074] Table 2-2

[0075] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2B The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 2D The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 2A to 2D It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0076] Example 2

[0077] The following reference Figures 3 to 4D The optical imaging system according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to Example 1 will be omitted for the sake of brevity. Figure 3 A structural schematic diagram of an optical imaging system according to Example 2 of the present application is shown.

[0078] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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.

[0079] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0080] In this example, the total effective focal length f of the optical imaging system is 5.28 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.146 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.35 mm.

[0081] Table 3 shows the basic parameters of the optical imaging system of Example 2, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 4-1 and 4-2 show the high-order coefficients of each aspheric mirror surface that can be used in Example 2, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0082]

[0083] Table 3

[0084]

[0085]

[0086] Table 4-1

[0087] Face number A18 A20 A22 A24 A26 A28 A30 S1 1.2322E+00 -5.7755E-01 1.8940E-01 -4.1836E-02 5.7835E-03 -4.2956E-04 1.1370E-05 S2 -2.4902E+01 1.7478E+01 -8.7220E+00 3.0191E+00 -6.8879E-01 9.3116E-02 -5.6486E-03 S3 -1.0354E+01 8.3358E+00 -4.7232E+00 1.8444E+00 -4.7264E-01 7.1554E-02 -4.8509E-03 S4 -7.6024E+01 6.3089E+01 -3.7471E+01 1.5513E+01 -4.2486E+00 6.9142E-01 -5.0605E-02 S5 -1.1842E-02 1.2375E-03 8.1827E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.1816E-01 -2.4289E-02 1.7548E-03 9.0107E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.8560E+00 -2.2029E+00 8.9797E-01 -2.5114E-01 4.4986E-02 -4.5147E-03 1.8174E-04 S8 3.8516E-02 -8.4289E-03 1.0757E-03 -6.0902E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.2272E-01 5.4972E-02 -1.6649E-02 3.3821E-03 -4.4089E-04 3.3253E-05 -1.0998E-06 S10 -2.9693E-02 1.0859E-02 -2.6527E-03 4.3295E-04 -4.5415E-05 2.7733E-06 -7.5037E-08 S11 -5.0844E-04 9.0767E-05 -1.0929E-05 8.8409E-07 -4.6213E-08 1.4141E-09 -1.9280E-11 S12 1.7929E-04 -2.2249E-05 1.9199E-06 -1.1162E-07 4.0934E-09 -8.2539E-11 6.4146E-13 S13 2.9753E-05 -2.4897E-06 1.5021E-07 -6.3652E-09 1.7979E-10 -3.0396E-12 2.3268E-14 S14 3.1397E-05 -2.5429E-06 1.4841E-07 -6.0771E-09 1.6570E-10 -2.7026E-12 1.9961E-14

[0088] Table 4-2 Figure 4A The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4DThe chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4A to 4D It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0089] Example 3 The following reference Figures 5 to 6D An optical imaging system according to Example 3 of the present application is described. Figure 5 A structural schematic diagram of an optical imaging system according to Example 3 of the present application is shown.

[0090] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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.

[0091] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0092] In this example, the total effective focal length f of the optical imaging system is 5.36 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.736 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.24 mm.

[0093] Table 5 shows the basic parameters of the optical imaging system of Example 3, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 6-1 and 6-2 show the high-order coefficients of each aspheric mirror surface that can be used in Example 3, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0094]

[0095] Table 5

[0096]

[0097]

[0098] Table 6-1

[0099] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.8286E-05 6.0792E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.4813E-02 9.8086E-03 -1.5837E-03 1.1147E-04 0.0000E+00 0.0000E+00 0.0000E+00 S3 -4.7613E-03 1.6927E-03 -3.1034E-04 2.2627E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.7261E-01 -6.7188E-02 1.6367E-02 -2.2061E-03 1.2131E-04 0.0000E+00 0.0000E+00 S5 -2.6730E+00 3.2507E+00 -2.2370E+00 9.7056E-01 -2.6361E-01 4.1096E-02 -2.8139E-03 S6 -9.9570E-01 9.1492E-01 -5.0525E-01 1.8014E-01 -4.0644E-02 5.2846E-03 -3.0181E-04 S7 2.3698E+00 -1.3171E+00 5.2735E-01 -1.4631E-01 2.6567E-02 -2.8342E-03 1.3458E-04 S8 9.6602E-01 -4.8199E-01 1.7051E-01 -4.1692E-02 6.6922E-03 -6.3360E-04 2.6776E-05 S9 5.0744E-02 -1.9001E-02 5.3078E-03 -1.0573E-03 1.4046E-04 -1.1063E-05 3.8832E-07 S10 -4.5789E-03 2.4243E-03 -6.4948E-04 1.0630E-04 -1.0710E-05 6.1206E-07 -1.5224E-08 S11 1.2615E-03 -1.8019E-04 1.8191E-05 -1.2685E-06 5.8133E-08 -1.5762E-09 1.9164E-11 S12 -3.2505E-04 3.6283E-05 -2.9199E-06 1.6443E-07 -6.1269E-09 1.3511E-10 -1.3280E-12 S13 -1.3399E-05 9.4155E-07 -4.7847E-08 1.7125E-09 -4.0957E-11 5.8753E-13 -3.8233E-15 S14 -7.5185E-06 5.4873E-07 -2.8998E-08 1.0772E-09 -2.6627E-11 3.9267E-13 -2.6113E-15

[0100] Table 6-2

[0101] Figure 6A The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion values corresponding to different image heights. Figure 6D The chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 6A to 6D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0102] Example 4

[0103] The following reference Figures 7 to 8D An optical imaging system according to Example 4 of the present application is described. Figure 7 A structural schematic diagram of an optical imaging system according to Example 4 of the present application is shown.

[0104] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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 positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0106] In this example, the total effective focal length f of the optical imaging system is 5.36 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.807 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.24 mm.

[0107] Table 7 shows the basic parameters of the optical imaging system of Example 4, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 8-1 and 8-2 show the high-order coefficients of each aspheric mirror surface that can be used in Example 4, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0108]

[0109] Table 7

[0110]

[0111]

[0112] Table 8-1

[0113] Face number A18 A20 A22 A24 A26 A28 A30 S1 6.5838E-05 -2.8773E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -5.7925E-02 1.5482E-02 -2.3736E-03 1.5864E-04 0.0000E+00 0.0000E+00 0.0000E+00 S3 3.5710E-03 -3.6330E-04 -2.4528E-05 5.1893E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.8194E-01 -6.0160E-02 1.1559E-02 -1.0282E-03 1.4483E-05 0.0000E+00 0.0000E+00 S5 7.0526E+00 -3.2322E+00 8.8662E-01 -8.9214E-02 -2.3455E-02 8.4763E-03 -8.0620E-04 S6 5.8073E+00 -2.4386E+00 6.9373E-01 -1.2258E-01 1.0569E-02 7.0918E-05 -6.0088E-05 S7 6.5601E+00 -3.2581E+00 1.1853E+00 -3.0489E-01 5.2272E-02 -5.3429E-03 2.4585E-04 S8 1.7168E+00 -8.0825E-01 2.7112E-01 -6.3128E-02 9.6837E-03 -8.7898E-04 3.5719E-05 S9 -2.9269E-02 9.1927E-03 -1.7758E-03 1.7798E-04 -1.4233E-06 -1.4201E-06 9.4828E-08 S10 -1.6704E-03 1.5331E-03 -4.6293E-04 7.9892E-05 -8.2913E-06 4.8287E-07 -1.2168E-08 S11 1.5626E-03 -2.2687E-04 2.3237E-05 -1.6413E-06 7.6103E-08 -2.0854E-09 2.5602E-11 S12 -3.1256E-04 3.4037E-05 -2.6661E-06 1.4578E-07 -5.2583E-09 1.1177E-10 -1.0523E-12 S13 -1.3758E-05 9.9316E-07 -5.1898E-08 1.9145E-09 -4.7344E-11 7.0497E-13 -4.7820E-15 S14 -8.4925E-06 6.5656E-07 -3.6560E-08 1.4246E-09 -3.6804E-11 5.6561E-13 -3.9103E-15

[0114] Table 8-2

[0115] Figure 8A The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 8B The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8DThe chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8A to 8D It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0116] Example 5

[0117] The following reference Figures 9 to 10D An optical imaging system according to Example 5 of the present application is described. Figure 9 A structural schematic diagram of an optical imaging system according to Example 5 of the present application is shown.

[0118] like Figure 9 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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.

[0119] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0120] In this example, the total effective focal length f of the optical imaging system is 5.34 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.894 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.20 mm.

[0121] Table 9 shows the basic parameters of the optical imaging system of Example 5, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 10-1 and 10-2 show the high-order coefficients of each aspheric mirror surface that can be used in Example 5, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0122]

[0123] Table 9

[0124]

[0125]

[0126] Table 10-1

[0127] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.3765E-04 1.0054E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.9940E-03 1.4010E-03 -2.6515E-04 2.0864E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 2.1078E-02 -5.9618E-03 9.6436E-04 -6.8280E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 -3.4836E-03 4.7726E-03 -2.0456E-03 3.8679E-04 -2.4035E-05 0.0000E+00 0.0000E+00 S5 1.2077E+01 -6.5112E+00 2.4089E+00 -5.8055E-01 8.1422E-02 -4.8471E-03 -4.2523E-05 S6 1.0959E+01 -5.3289E+00 1.8419E+00 -4.3907E-01 6.8190E-02 -6.1611E-03 2.4304E-04 S7 1.0395E+01 -5.1986E+00 1.8755E+00 -4.7430E-01 7.9635E-02 -7.9627E-03 3.5856E-04 S8 -6.2575E-03 4.7218E-03 -1.8694E-03 4.8314E-04 -8.4448E-05 9.2889E-06 -4.8567E-07 S9 -9.3254E-02 3.8172E-02 -1.0889E-02 2.1220E-03 -2.6929E-04 2.0059E-05 -6.6564E-07 S10 1.1220E-03 4.3269E-05 -6.3159E-05 1.4295E-05 -1.6489E-06 1.0014E-07 -2.5422E-09 S11 1.8649E-04 -1.5808E-05 3.6429E-07 6.9752E-08 -7.9964E-09 3.5963E-10 -6.2754E-12 S12 -6.9400E-05 2.9384E-06 1.8950E-07 -3.7793E-08 2.5815E-09 -8.7845E-11 1.2387E-12 S13 -2.6498E-05 1.9194E-06 -1.0014E-07 3.6645E-09 -8.9218E-11 1.2973E-12 -8.5201E-15 S14 -1.1376E-05 7.7795E-07 -3.8952E-08 1.3877E-09 -3.3295E-11 4.8210E-13 -3.1808E-15

[0128] Table 10-2

[0129] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 10B The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 10D The chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 10A to 10D It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0130] Example 6

[0131] The following reference Figures 11 to 12D An optical imaging system according to Example 6 of the present application is described. Figure 11 A structural schematic diagram of an optical imaging system according to Example 6 of the present application is shown.

[0132] like Figure 11 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, 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.

[0133] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from an object sequentially passes through surfaces S1 to S16 and is ultimately imaged on an imaging surface S17.

[0134] In this example, the total effective focal length f of the optical imaging system is 5.34 mm, the distance TD on the optical axis from the object-side surface S1 of the first lens element E1 to the image-side surface S14 of the seventh lens element E7 is 5.563 mm, and half the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 5.37 mm.

[0135] Table 11 shows the basic parameters of the optical imaging system of Example 6, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 12-1 and 12-2 show the high-order coefficients of the various aspheric mirror surfaces that can be used in Example 6, where the surface shapes of the various aspheric surfaces can be defined by formula (1) given in Example 1 above.

[0136]

[0137] Table 11

[0138]

[0139]

[0140] Table 12-1

[0141] Face number A18 A20 A22 A24 A26 A28 A30 S1 -9.4086E-05 1.0975E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -6.1638E-02 1.6192E-02 -2.4324E-03 1.5896E-04 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.9494E-02 -1.7776E-02 3.0458E-03 -2.2835E-04 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.8697E-02 6.1516E-02 -3.4362E-02 8.7078E-03 -8.6789E-04 0.0000E+00 0.0000E+00 S5 -1.7891E+01 1.5244E+01 -9.0733E+00 3.6909E+00 -9.7740E-01 1.5179E-01 -1.0486E-02 S6 1.5127E+01 -8.1266E+00 3.0959E+00 -8.1253E-01 1.3898E-01 -1.3853E-02 6.0508E-04 S7 1.4164E+01 -7.4715E+00 2.8395E+00 -7.5633E-01 1.3383E-01 -1.4115E-02 6.7106E-04 S8 3.2563E+00 -1.5594E+00 5.3577E-01 -1.2854E-01 2.0424E-02 -1.9291E-03 8.1900E-05 S9 -3.9178E-02 1.5663E-02 -4.2831E-03 8.0140E-04 -9.9255E-05 7.4422E-06 -2.5999E-07 S10 2.6209E-02 -5.5529E-03 7.9008E-04 -6.9781E-05 3.1154E-06 -1.1227E-08 -3.1059E-09 S11 2.0237E-04 7.3684E-06 -4.8866E-06 6.7555E-07 -4.9043E-08 1.9137E-09 -3.1776E-11 S12 3.0499E-04 -4.2264E-05 4.1580E-06 -2.8393E-07 1.2794E-08 -3.4192E-10 4.1019E-12 S13 1.4509E-04 -1.2648E-05 7.9712E-07 -3.5354E-08 1.0464E-09 -1.8549E-11 1.4894E-13 S14 5.0771E-05 -3.8045E-06 2.0771E-07 -8.0381E-09 2.0900E-10 -3.2752E-12 2.3376E-14

[0142] Table 12-2

[0143] Figure 12A The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 12B The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 12C The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion values corresponding to different image heights. Figure 12D The chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 12A to 12D It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0144] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0145]

[0146]

[0147] Table 13

[0148] The present application also provides an imaging device, wherein the electronic photosensitive element thereof can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0149] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging system, characterized in that Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens having optical power; a fourth lens having optical power and a convex object-side surface; a fifth lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a sixth lens element having positive optical power, the object-side surface of which is convex and the image-side surface of which is concave; and a seventh lens element having negative optical power; wherein the number of lenses having optical power in the optical imaging system is seven; The third lens has an opposite optical power to the fourth lens; The optical imaging system satisfies the following: 40.18≤V1 / (Fno×TD / ImgH)≤51.39, where V1 is the Abbe number of the first lens, Fno is the aperture number of the optical imaging system, TD is the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system; The optical imaging system satisfies: -1.30≤f3 / f4≤-0.87, where f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: 0.5<(R10-R9) / f5≤2.23, where R9 is the curvature radius of the object side surface of the fifth lens, R10 is the curvature radius of the image side surface of the fifth lens, and f5 is the effective focal length of the fifth lens.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following: 3.4<f67 / (CT6+T67+CT7)≤7.90, where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the center thickness of the sixth lens on the optical axis, T67 is the air spacing between the sixth lens and the seventh lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: 2.31≤(R1+R2) / EPD≤3.51, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and EPD is the entrance pupil diameter of the optical imaging system.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: 2.22≤(R3+R4) / f≤5.57, where R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, and f is the total effective focal length of the optical imaging system.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following: 4.15≤f1234 / (CT1+CT4)≤5.55, where f1234 is the combined focal length of the first lens, the second lens, the third lens, and the fourth lens, CT1 is the center thickness of the first lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: 0.57≤(R5 / R6)×(SAG21 / SAG22)≤2.23, wherein R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, SAG21 is the distance 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 SAG22 is the distance 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.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following: 15.50≤R7 / (T34+CT4)≤50.88, where R7 is the radius of curvature of the object side surface of the fourth lens, T34 is the air spacing between the third lens and the fourth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: -1.57≤R11 / (SAG51+SAG52)≤-0.89, wherein R11 is the curvature radius of the object side surface of the sixth lens, SAG51 is the distance from 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 on the optical axis, and SAG52 is the distance from 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 on the optical axis.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following: -23.22≤f45 / (T45+CT5)≤-8.14, where f45 is the combined focal length of the fourth lens and the fifth lens, T45 is the air spacing between the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

11. The optical imaging system according to any one of claims 1 to 10, characterized in that: The optical imaging system satisfies the following: 1.09≤(f2-f1) / (f2+f1)<2, where f2 is the effective focal length of the second lens, and f1 is the effective focal length of the first lens.

Images