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 optical power; a second lens with negative optical power; an aperture; a third lens with optical power; a fourth lens with negative optical power, whose image side surface is convex; a fifth lens with optical power; a sixth lens with optical power, whose object side surface is concave; and a seventh lens with optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfy: 1.0<TTL / ImgH<1.3.

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 development of society, portable electronic products such as smartphones and tablets have become indispensable tools in people's lives. Currently, portable electronic products such as smartphones and tablets on the market are gradually becoming smaller, which requires the optical imaging systems used on them to meet the characteristics of miniaturization and lightness as much as possible while ensuring the imaging quality in order to adapt to portable electronic products. This undoubtedly increases the design difficulty of the optical imaging system. In addition, with the improvement of image sensor performance and the reduction of size, the corresponding optical imaging system has less and less design freedom, which further increases the design difficulty of the optical imaging system.

[0003] How to reasonably set the technical parameters such as the focal length and surface shape of each lens in the optical imaging system so that the optical imaging system can have the characteristics of miniaturization, lightness and thinness on the basis of high imaging quality and can better match the image sensor is one of the difficult problems that many lens designers need to solve urgently. Summary of the invention

[0004] On one hand, the present application provides such 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; a second lens with negative optical power; an aperture; a third lens with optical power; a fourth lens with negative optical power, whose image side surface is convex; a fifth lens with optical power; a sixth lens with optical power, whose object side surface is concave; and a seventh lens with optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH can satisfy: 1.0<TTL / ImgH<1.3.

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

[0006] In one embodiment, the total effective focal length f of the optical imaging system and the curvature radius R9 of the object-side surface of the fifth lens element may satisfy: 0.5<R9 / f<1.2.

[0007] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens may satisfy: -4.5<f2 / f1<-2.0.

[0008] In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f7 of the seventh lens may satisfy: -1.5<f / f7<-1.0.

[0009] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens may satisfy: 4.0<R2 / R1<6.0.

[0010] In one embodiment, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object-side surface of the fifth lens may satisfy: 1.0<f5 / R9<1.5.

[0011] In one embodiment, the effective focal length f4 of the fourth lens and the curvature radius R7 of the object-side surface of the fourth lens may satisfy: 2.0<f4 / R7<4.0.

[0012] In one embodiment, a curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R12 of the image-side surface of the sixth lens may satisfy: 0.5<R10 / R12<1.5.

[0013] In one embodiment, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: -11.7<R11 / R14<-7.7.

[0014] In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 4.7<T67 / T56<10.3.

[0015] In one embodiment, the relative F number Fno of the optical imaging system may satisfy: Fno≤1.9.

[0016] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 40°<Semi-FOV<45°.

[0017] On the other 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; a second lens with negative optical power; an aperture; a third lens with optical power; a fourth lens with negative optical power, whose image side surface is convex; a fifth lens with optical power; a sixth lens with optical power, whose object side surface is concave; and a seventh lens with optical power. The total effective focal length f of the optical imaging system and the curvature radius R9 of the object side surface of the fifth lens can satisfy: 0.5<R9 / f<1.2.

[0018] In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f7 of the seventh lens may satisfy: -1.5<f / f7<-1.0.

[0019] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens may satisfy: 4.0<R2 / R1<6.0.

[0020] In one embodiment, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object-side surface of the fifth lens may satisfy: 1.0<f5 / R9<1.5.

[0021] In one embodiment, the effective focal length f4 of the fourth lens and the curvature radius R7 of the object-side surface of the fourth lens may satisfy: 2.0<f4 / R7<4.0.

[0022] In one embodiment, a curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R12 of the image-side surface of the sixth lens may satisfy: 0.5<R10 / R12<1.5.

[0023] In one embodiment, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: -11.7<R11 / R14<-7.7.

[0024] In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 4.7<T67 / T56<10.3.

[0025] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens may satisfy: -4.5<f2 / f1<-2.0.

[0026] In one embodiment, the relative F number Fno of the optical imaging system may satisfy: Fno≤1.9.

[0027] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 40°<Semi-FOV<45°.

[0028] In one embodiment, the distance TTL from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system ImgH may satisfy: 1.0<TTL / ImgH<1.3.

[0029] The present application provides an optical imaging system which is applicable to lightweight electronic products, has thinness, miniaturization and good imaging quality, by reasonably allocating optical focal length and optimizing optical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

[0032] FIG. 2A to FIG. 2C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system of Example 1 are respectively shown;

[0033] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0034] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system of Example 2 are respectively shown;

[0035] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0036] FIG. 6A to FIG. 6C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system of Example 3 are respectively shown;

[0037] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0038] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system of Example 4 are respectively shown;

[0039] Fig. 9 shows a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application; and

[0040] FIG. 10A to FIG. 10C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system of Example 5 are respectively shown. DETAILED DESCRIPTION

[0041] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0044] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0045] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0046] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] The features, principles and other aspects of the present application are described in detail below.

[0049] The optical imaging system according to the exemplary embodiment of the present application may include seven lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the seventh lens may have a spacing distance between them.

[0050] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have negative optical power; the third lens may have positive optical power or negative optical power; the fourth lens may have negative optical power, and its image side surface may be convex; the fifth lens may have positive optical power or negative optical power; the sixth lens may have positive optical power or negative optical power, and its object side surface may be concave; and the seventh lens may have positive optical power or negative optical power.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<TTL / ImgH<1.3, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system. More specifically, TTL and ImgH may further satisfy: 1.1<TTL / ImgH<1.3. Satisfying 1.0<TTL / ImgH<1.3 is conducive to achieving ultra-thin characteristics.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<R9 / f<1.2, where f is the total effective focal length of the optical imaging system, and R9 is the radius of curvature of the object side of the fifth lens. More specifically, R9 and f may further satisfy: 0.8<R9 / f<1.1. Satisfying 0.5<R9 / f<1.2 can reduce the field curvature and distortion of the optical imaging system, and reduce the difficulty of processing the fifth lens.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -4.5<f2 / f1<-2.0, where f2 is the effective focal length of the second lens and f1 is the effective focal length of the first lens. Satisfying -4.5<f2 / f1<-2.0 can control the ghost image formed by the total internal reflection of the second lens and reduce the sensitivity of the second lens.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -1.5<f / f7<-1.0, where f is the total effective focal length of the optical imaging system, and f7 is the effective focal length of the seventh lens. More specifically, f and f7 may further satisfy: -1.5<f / f7<-1.1. Satisfying -1.5<f / f7<-1.0 may reduce the sensitivity of the seventh lens.

[0055] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 4.0<R2 / R1<6.0, where R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens. More specifically, R2 and R1 may further satisfy: 4.0<R2 / R1<5.8. Satisfying 4.0<R2 / R1<6.0 is conducive to reducing the sensitivity of the system, while ensuring that the first lens has good processability.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<f5 / R9<1.5, where f5 is the effective focal length of the fifth lens, and R9 is the radius of curvature of the object side of the fifth lens. More specifically, f5 and R9 may further satisfy: 1.2<f5 / R9<1.5. Satisfying 1.0<f5 / R9<1.5 can control the ghost image formed by the total internal reflection of the fifth lens, and at the same time reduce the sensitivity of the fifth lens.

[0057] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 2.0<f4 / R7<4.0, where f4 is the effective focal length of the fourth lens, and R7 is the radius of curvature of the object side of the fourth lens. More specifically, f4 and R7 may further satisfy: 2.2<f4 / R7<3.8. Satisfying 2.0<f4 / R7<4.0 can control the deflection angle of the edge field of view at the fourth lens, which can effectively reduce the sensitivity of the system.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<R10 / R12<1.5, wherein R10 is the radius of curvature of the image side surface of the fifth lens, and R12 is the radius of curvature of the image side surface of the sixth lens. More specifically, R10 and R12 may further satisfy: 0.6<R10 / R12<1.3. Satisfying 0.5<R10 / R12<1.5 helps to improve the stability of system assembly.

[0059] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -11.7<R11 / R14<-7.7, wherein R11 is the radius of curvature of the object side surface of the sixth lens, and R14 is the radius of curvature of the image side surface of the seventh lens. Satisfying -11.7<R11 / R14<-7.7 helps to improve the stability of system assembly.

[0060] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 4.7<T67 / T56<10.3, wherein T56 is the distance between the fifth lens and the sixth lens on the optical axis, and T67 is the distance between the sixth lens and the seventh lens on the optical axis. Satisfying 4.7<T67 / T56<10.3 is conducive to reducing the degree of light deflection and sensitivity, while ensuring the imaging quality of the optical imaging system in an infinite state (i.e., when the object is far away from the optical imaging system).

[0061] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: Fno≤1.9, where Fno is the relative F number of the optical imaging system. Satisfying Fno≤1.9 can effectively increase the energy density on the imaging surface and improve the signal-to-noise ratio of the output signal of the image side sensor.

[0062] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 40°<Semi-FOV<45°, where Semi-FOV is half of the maximum field of view of the optical imaging system. More specifically, Semi-FOV may further satisfy: 41°<Semi-FOV<43°. Satisfying 40°<Semi-FOV<45° is conducive to enabling the optical imaging system to have a good imaging range in a smaller volume.

[0063] In an exemplary embodiment, the optical imaging system according to the present application also includes an aperture arranged between the second lens and the third lens. Optionally, the above optical imaging system may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging system with the characteristics of miniaturization, lightness, better matching with the image sensor and high imaging quality. The optical imaging system according to the above embodiment of the present application may use multiple lenses, such as the seven lenses mentioned above. By reasonably allocating the optical power, surface shape, center thickness of each lens and the on-axis 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 system can be improved, so that the optical imaging system is more conducive to production and processing.

[0064] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side 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 and image side 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.

[0065] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system 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 system is not limited to including seven lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0066] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0067] Example 1

[0068] The following reference Figures 1 to 2C An optical imaging system according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0069] like Figure 1 As shown, the optical imaging system 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.

[0070] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0071] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0072]

[0073] Table 1

[0074] In this example, the total effective focal length f of the optical imaging system is 5.07 mm, the total length TTL of the optical imaging system (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system) is 5.90 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system ImgH is 4.84 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 42.3°, and the relative F-number Fno of the optical imaging system is 1.88.

[0075] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0076]

[0077] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. 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, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A76, A77, A8, A9, A10, A11, A12, A13, A14, A15 10 , A 12 , A 14 , A 16 , A18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0078] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.1436E-03 -5.6024E-03 -4.2066E-03 -1.5324E-03 -6.2628E-04 -8.7896E-05 -3.5521E-05 S2 -3.2214E-02 1.6013E-03 -1.5183E-03 3.8051E-05 3.0975E-05 -3.8663E-06 9.0831E-06 S3 3.6942E-02 9.7140E-03 -1.0709E-03 8.5198E-04 -2.4567E-04 1.9309E-04 -9.9439E-05 S4 5.4399E-02 1.8798E-03 2.6795E-04 -3.4474E-04 1.7078E-04 -1.3252E-04 9.5665E-05 S5 -7.6236E-02 -1.5681E-02 -2.3640E-03 -2.7138E-03 -7.4990E-04 -1.0542E-03 -3.5283E-04 S6 -1.5628E-01 -7.1500E-03 1.7892E-04 1.4829E-03 3.9116E-04 2.4603E-04 6.5762E-05 S7 -2.9168E-01 1.5030E-02 -4.1694E-03 1.9443E-04 -6.5935E-04 -1.3373E-04 3.7697E-05 S8 -3.8189E-01 9.1905E-02 -6.6020E-03 -2.0082E-03 -1.5675E-03 3.7413E-04 2.7817E-04 S9 -1.1089E+00 1.3962E-02 4.1901E-02 1.4883E-02 -1.5582E-03 -4.3094E-03 -1.0070E-03 S10 -4.4184E-01 -1.1060E-01 5.5262E-02 2.0977E-02 -6.7968E-04 -1.4267E-03 -1.1235E-03 S11 -4.9073E-01 -8.2395E-02 3.8060E-02 1.2660E-02 -9.4011E-03 -1.6238E-03 -1.3132E-03 S12 -4.7598E-01 -6.7287E-02 8.3223E-02 1.2780E-02 -2.0939E-03 -6.7406E-03 8.2930E-05 S13 -2.5019E+00 1.2515E+00 -5.7007E-01 2.6836E-01 -1.3029E-01 6.5327E-02 -2.4765E-02 S14 -7.8797E+00 1.5794E+00 -5.1567E-01 2.4604E-01 -9.3190E-02 5.2087E-02 -4.3297E-02

[0079] Table 2-1

[0080] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2267E-05 -2.4214E-07 1.2732E-05 -3.3798E-06 3.7098E-06 -4.3717E-06 1.3653E-06 S2 -3.3548E-06 2.7694E-06 -3.9319E-06 -5.0743E-07 -1.8795E-06 1.3285E-06 3.2963E-07 S3 8.2754E-05 -5.9240E-05 3.7845E-05 -2.3093E-05 1.6759E-05 -2.5409E-05 1.1316E-05 S4 -6.4625E-05 3.5939E-05 -3.0866E-05 1.4586E-05 -1.9271E-05 2.0353E-05 -6.0687E-06 S5 -4.4307E-04 -9.6725E-05 -1.4335E-04 5.1825E-06 5.3983E-06 5.5190E-05 -8.9500E-06 S6 5.2150E-05 5.7557E-06 7.9757E-06 -9.8120E-07 2.6862E-06 -1.1707E-06 5.2841E-07 S7 4.5202E-05 3.9940E-05 -2.6833E-05 -5.9295E-06 -9.0612E-06 6.4455E-06 -5.1883E-06 S8 4.0618E-06 -2.5616E-05 -2.2441E-05 8.8720E-06 7.2933E-07 1.7749E-06 -9.5385E-07 S9 3.2359E-04 3.4432E-04 -3.7737E-04 1.5867E-05 1.0838E-04 7.7254E-05 -4.4740E-05 S10 3.6937E-04 4.9900E-05 -1.4696E-03 9.1188E-04 -5.1903E-04 4.2279E-05 1.7287E-04 S11 9.5450E-04 2.7066E-03 1.9381E-03 2.3055E-03 -2.3648E-03 -4.8517E-04 2.1295E-04 S12 1.7133E-03 2.1473E-03 -4.9281E-03 -7.5351E-03 -6.8258E-03 -1.4105E-03 -4.0951E-04 S13 1.6453E-02 -5.7759E-03 1.8912E-03 -2.7019E-03 -8.9049E-04 1.0125E-03 -1.0907E-03 S14 7.6736E-03 -3.9013E-03 6.3529E-03 1.3732E-03 2.6627E-03 -7.0392E-05 9.4992E-04

[0081] Table 2-2

[0082] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 2B An astigmatism curve of the optical imaging system of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2C The distortion curve of the optical imaging system of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 2A to FIG. 2C It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0083] Example 2

[0084] The following reference Figures 3 to 4C The optical imaging system according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging system according to Example 2 of the present application is shown.

[0085] like Figure 3 As shown, the optical imaging system 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.

[0086] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0087] In this example, the total effective focal length f of the optical imaging system is 5.13 mm, the total length TTL of the optical imaging system is 6.15 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 4.84 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 41.9°, and the relative F number Fno of the optical imaging system is 1.90.

[0088] Table 3 shows the basic parameters of the optical imaging system of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Tables 4-1 and 4-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0089]

[0090] Table 3

[0091]

[0092]

[0093] Table 4-1

[0094] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2267E-05 -2.4214E-07 1.2732E-05 -3.3798E-06 3.7098E-06 -4.3717E-06 1.3653E-06 S2 -3.3548E-06 2.7694E-06 -3.9319E-06 -5.0743E-07 -1.8795E-06 1.3285E-06 3.2963E-07 S3 9.2553E-06 1.1431E-06 4.0892E-06 -1.6688E-06 1.5066E-08 -1.6608E-06 3.5752E-06 S4 1.2044E-05 1.3569E-05 3.3967E-06 4.4548E-06 1.0539E-06 2.4404E-06 -1.3883E-06 S5 8.6367E-05 5.0388E-06 3.2160E-05 3.9142E-06 2.1198E-05 6.9283E-06 1.3252E-05 S6 5.2150E-05 5.7557E-06 7.9757E-06 -9.8120E-07 2.6862E-06 -1.1707E-06 5.2841E-07 S7 5.0334E-05 3.5208E-05 7.7157E-06 4.2276E-06 3.0629E-06 1.1574E-06 -1.6932E-06 S8 4.0618E-06 -2.5616E-05 -2.2441E-05 8.8720E-06 7.2933E-07 1.7749E-06 -9.5385E-07 S9 2.4852E-04 3.5415E-04 3.5623E-05 4.6578E-05 -1.2989E-04 -4.1641E-05 -1.0717E-06 S10 -1.3753E-03 4.4533E-04 3.9747E-04 9.8775E-04 -3.2228E-04 1.8532E-03 7.5618E-04 S11 -4.4964E-03 -1.4372E-03 -1.3562E-03 -1.5483E-03 -2.6196E-03 2.2036E-03 1.0336E-03 S12 1.7656E-03 2.1849E-03 -1.0220E-04 -1.3639E-03 -3.5307E-04 2.2864E-03 5.4657E-04 S13 3.6963E-03 -3.3343E-03 2.9601E-03 -1.8669E-03 2.3127E-04 7.5181E-04 -3.1891E-04 S14 1.5155E-02 -4.9215E-03 3.4387E-03 -2.4739E-03 7.2548E-04 -1.0649E-03 5.8829E-04

[0095] Table 4-2

[0096] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4B An astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4CThe distortion curve of the optical imaging system of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 4A to FIG. 4C It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0097] Example 3

[0098] The following reference Figures 5 to 6C An optical imaging system according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown.

[0099] like Figure 5 As shown, the optical imaging system 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.

[0100] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0101] In this example, the total effective focal length f of the optical imaging system is 5.13 mm, the total length TTL of the optical imaging system is 5.98 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 4.84 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 42.3°, and the relative F number Fno of the optical imaging system is 1.88.

[0102] Table 5 shows the basic parameters of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Tables 6-1 and 6-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0103]

[0104] Table 5

[0105]

[0106]

[0107] Table 6-1

[0108] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2267E-05 -2.4214E-07 1.2732E-05 -3.3798E-06 3.7098E-06 -4.3717E-06 1.3653E-06 S2 -3.3548E-06 2.7694E-06 -3.9319E-06 -5.0743E-07 -1.8795E-06 1.3285E-06 3.2963E-07 S3 -1.6836E-06 -2.6083E-06 1.1332E-06 -3.0057E-06 -4.5292E-06 9.0533E-07 1.1052E-05 S4 1.2758E-05 1.1717E-05 1.1447E-05 -2.3897E-06 3.8295E-06 3.7527E-06 2.4525E-06 S5 4.2936E-05 -8.5054E-06 9.3606E-06 -1.5775E-05 1.6638E-05 -3.6590E-06 7.1021E-06 S6 5.2150E-05 5.7557E-06 7.9757E-06 -9.8120E-07 2.6862E-06 -1.1707E-06 5.2841E-07 S7 4.2751E-05 2.7377E-05 1.0117E-05 7.3286E-06 -9.9277E-07 3.9435E-07 -4.0660E-07 S8 4.0618E-06 -2.5616E-05 -2.2441E-05 8.8720E-06 7.2933E-07 1.7749E-06 -9.5385E-07 S9 2.4719E-04 3.5176E-04 -3.3807E-04 9.7061E-05 2.2172E-04 5.4714E-05 -7.9797E-05 S10 -4.3058E-04 -9.9693E-04 -1.8631E-03 1.6847E-03 6.6007E-04 -4.2190E-05 -1.4726E-04 S11 1.1293E-03 1.9850E-03 1.9848E-03 2.4078E-03 -2.2687E-03 -1.9111E-03 -5.4706E-04 S12 1.7663E-03 2.1964E-03 -1.0656E-03 -3.6691E-03 -3.9984E-03 -2.9269E-04 -2.7774E-04 S13 4.5772E-03 -1.0261E-03 2.6534E-03 -1.8832E-03 4.6747E-04 8.1323E-04 -4.6023E-04 S14 1.1652E-02 -5.9050E-03 2.7267E-03 -5.2921E-04 2.7755E-03 -2.8268E-04 4.3938E-04

[0109] Table 6-2

[0110] Fig. 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6B An astigmatism curve of the optical imaging system of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6C The distortion curve of the optical imaging system of Example 3 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 6A to FIG. 6C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0111] Example 4

[0112] The following reference Figures 7 to 8C An optical imaging system according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown.

[0113] like Figure 7 As shown, the optical imaging system 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.

[0114] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0115] In this example, the total effective focal length f of the optical imaging system is 5.05 mm, the total length TTL of the optical imaging system is 5.94 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 4.84 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 42.5°, and the relative F number Fno of the optical imaging system is 1.87.

[0116] Table 7 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Tables 8-1 and 8-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0117]

[0118] Table 7

[0119]

[0120]

[0121] Table 8-1

[0122] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2267E-05 -2.4214E-07 1.2732E-05 -3.3798E-06 3.7098E-06 -4.3717E-06 1.3653E-06 S2 -3.3548E-06 2.7694E-06 -3.9319E-06 -5.0743E-07 -1.8795E-06 1.3285E-06 3.2963E-07 S3 1.4660E-06 -4.1143E-07 7.1360E-06 2.4709E-06 3.2505E-06 1.6451E-06 5.3311E-06 S4 -4.4220E-07 2.9112E-06 6.8342E-06 1.2627E-06 -1.0049E-06 -8.6924E-07 2.5092E-06 S5 3.3037E-05 -1.6416E-05 5.1573E-06 -1.2108E-05 7.6145E-06 9.0460E-07 8.0812E-06 S6 5.2150E-05 5.7557E-06 7.9757E-06 -9.8120E-07 2.6862E-06 -1.1707E-06 5.2841E-07 S7 4.4965E-05 3.7565E-05 3.1030E-06 -1.3997E-05 -1.6168E-05 -1.0736E-05 -2.3153E-06 S8 4.0618E-06 -2.5616E-05 -2.2441E-05 8.8720E-06 7.2933E-07 1.7749E-06 -9.5385E-07 S9 2.4593E-04 3.5173E-04 -1.2423E-04 3.2927E-04 1.8501E-04 8.4956E-05 -3.5418E-05 S10 7.2252E-04 -3.4108E-05 -1.0702E-03 1.4530E-03 -2.7545E-04 -1.6981E-04 1.0372E-04 S11 1.3350E-03 1.0452E-03 1.0117E-03 2.2161E-03 -1.9525E-03 -1.0627E-03 1.1482E-04 S12 1.7627E-03 2.1884E-03 1.3861E-03 -4.5982E-04 -2.1702E-03 -1.1830E-04 2.9568E-04 S13 5.9352E-03 -2.8215E-03 1.8646E-03 -8.7796E-04 1.1655E-04 1.1627E-04 1.6815E-04 S14 1.3069E-02 -3.2147E-03 2.2253E-03 -3.4280E-03 1.2021E-03 -5.1123E-04 6.7749E-04

[0123] Table 8-2

[0124] Fig. 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8B An astigmatism curve of the optical imaging system of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8CThe distortion curve of the optical imaging system of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 8A to FIG. 8C It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0125] Example 5

[0126] The following reference Figures 9 to 10C An optical imaging system according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging system according to Example 5 of the present application is shown.

[0127] like Fig. 9 As shown, the optical imaging system 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.

[0128] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0129] In this example, the total effective focal length f of the optical imaging system is 5.08 mm, the total length TTL of the optical imaging system is 5.93 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 4.84 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 42.3°, and the relative F number Fno of the optical imaging system is 1.88.

[0130] Table 9 shows the basic parameters of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Tables 10-1 and 10-2 show the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0131]

[0132] Table 9

[0133]

[0134]

[0135] Table 10-1

[0136] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.2267E-05 -2.4214E-07 1.2732E-05 -3.3798E-06 3.7098E-06 -4.3717E-06 1.3653E-06 S2 -3.3548E-06 2.7694E-06 -3.9319E-06 -5.0743E-07 -1.8795E-06 1.3285E-06 3.2963E-07 S3 1.8836E-06 -3.4516E-09 3.2989E-06 2.6447E-06 5.1117E-07 1.6074E-07 2.7402E-06 S4 9.3625E-06 7.3648E-06 4.6183E-06 1.8159E-06 -1.3152E-07 1.1356E-06 1.0137E-06 S5 2.0313E-05 -2.3419E-06 4.4297E-06 2.8700E-06 -5.8993E-07 -4.8021E-06 -3.6880E-07 S6 5.2150E-05 5.7557E-06 7.9757E-06 -9.8120E-07 2.6862E-06 -1.1707E-06 5.2841E-07 S7 4.7122E-05 3.7481E-05 -5.4678E-06 -1.0961E-05 -1.3606E-05 -1.7326E-07 -1.2239E-06 S8 4.0618E-06 -2.5616E-05 -2.2441E-05 8.8720E-06 7.2933E-07 1.7749E-06 -9.5385E-07 S9 2.4613E-04 3.5196E-04 -1.8374E-04 2.4512E-04 1.0856E-04 -1.8817E-05 -2.6022E-05 S10 -3.0882E-04 5.0783E-04 -1.1892E-03 1.2054E-03 -3.1140E-04 -2.0128E-04 1.3411E-04 S11 2.6768E-04 2.5324E-03 2.2625E-03 1.9010E-03 -2.6353E-03 -7.6718E-04 2.6674E-04 S12 1.7598E-03 2.1831E-03 1.8081E-03 -1.3253E-03 -2.3421E-03 2.5624E-04 2.6884E-04 S13 1.5482E-02 -8.8066E-03 1.2416E-03 -8.1247E-03 2.8030E-03 -4.3071E-03 -1.0933E-04 S14 2.8060E-02 -2.3996E-02 -5.4700E-03 -1.2206E-02 2.6243E-03 -1.1547E-03 2.6747E-03

[0137] Table 10-2

[0138] Fig. 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 10B An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 10C The distortion curve of the optical imaging system of Example 5 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 10A to FIG. 10C It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0139] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0140]

[0141]

[0142] Table 11

[0143] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0144] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An 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, and its object side surface is convex and its image side surface is concave; A second lens having negative optical power, whose image side surface is concave; Aperture; a third lens having optical power; a fourth lens element having negative optical power, whose object side surface is concave and image side surface is convex; a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a sixth lens having optical power, wherein the object-side surface is concave and the image-side surface is convex; and The seventh lens element has a negative optical power and its image side surface is concave; The number of lenses having optical power in the optical imaging system is seven; The total effective focal length f of the optical imaging system and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.89≤R9 / f≤1.

02.

2. The optical imaging system according to claim 1, characterized in that: The total effective focal length f of the optical imaging system and the effective focal length f7 of the seventh lens satisfy: -1.44≤f / f7≤-1.

23.

3. The optical imaging system according to claim 1, characterized in that: A curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens satisfy: 4.12≤R2 / R1≤5.

75.

4. The optical imaging system according to claim 1, characterized in that: An effective focal length f5 of the fifth lens and a curvature radius R9 of the object-side surface of the fifth lens satisfy: 1.39≤f5 / R9<1.

5.

5. The optical imaging system according to claim 1, characterized in that: An effective focal length f4 of the fourth lens and a curvature radius R7 of the object side surface of the fourth lens satisfy: 2.25≤f4 / R7≤3.

64.

6. The optical imaging system according to claim 1, characterized in that: A curvature radius R10 of the image side surface of the fifth lens and a curvature radius R12 of the image side surface of the sixth lens satisfy: 0.73≤R10 / R12≤1.

22.

7. The optical imaging system according to claim 1, characterized in that: A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R14 of the image-side surface of the seventh lens satisfy: -11.7<R11 / R14<-7.

7.

8. The optical imaging system according to claim 1, characterized in that: A distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis satisfy: 4.76≤T67 / T56<10.

3.

9. The optical imaging system according to claim 1, characterized in that: The effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -4.29≤f2 / f1≤-2.

34.

10. The optical imaging system according to any one of claims 1 to 9, characterized in that: The relative F number Fno of the optical imaging system satisfies: 1.87≤Fno≤1.

9.

11. The optical imaging system according to any one of claims 1 to 9, characterized in that: Half of the maximum field of view Semi-FOV of the optical imaging system satisfies: 41.9°≤Semi-FOV≤42.5°.

12. The optical imaging system according to any one of claims 2 to 9, characterized in that: The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfy: 1.22≤TTL / ImgH<1.3.

Images