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

Description

Technical Field

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

[0002] With the upgrading of consumer electronic products and the development of image software functions and video software functions on consumer electronic products, the market demand for optical imaging systems suitable for portable electronic products is gradually increasing.

[0003] Camera modules are usually provided on portable devices such as mobile phones to enable the mobile phones to have camera functions. The camera module is usually provided with a charge-coupled device (CCD) type image sensor or a complementary metal oxide semiconductor (CMOS) type image sensor, and is provided with an optical imaging system. The optical imaging system can collect the light on the object side, and the imaging light travels along the optical path of the optical imaging system and irradiates the image sensor, and then the image sensor converts the optical signal into an electrical signal to form image data. While ensuring the imaging quality, the optical imaging system is gradually developing in the direction of miniaturization and thinness, which makes the design more difficult. In addition, the performance improvement and size reduction of the image sensor have also made the design freedom of the corresponding optical imaging system smaller and smaller, increasing the design difficulty. Summary of the invention

[0004] 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 focal length; a second lens with negative optical focal length; an aperture; a third lens with optical focal length; a fourth lens with positive optical focal length, whose image side surface is convex; a fifth lens with optical focal length; a sixth lens with optical focal length, whose object side surface is concave; and a seventh lens with optical focal length; wherein a distance TTL from the object side surface of the first lens to the imaging plane on the optical axis and half the diagonal length of the effective pixel area on the imaging plane ImgH can satisfy the following conditions: 1.0<TTL / ImgH<1.3.

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

[0006] In one embodiment, the aperture number Fno of the optical imaging system may satisfy: Fno≤1.9.

[0007] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 40°<Semi-FOV<45°.

[0008] In one embodiment, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy: 1.0<f3 / f4<2.0.

[0009] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens may satisfy: -3.0<f2 / f1<-2.0.

[0010] In one embodiment, a curvature radius R13 of the object-side surface of the seventh lens and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: 4.0<R13 / R14<4.6.

[0011] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy: 4.0<R3 / R4<8.2.

[0012] In one embodiment, a spacing distance T67 between the sixth lens and the seventh lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis may satisfy: 1.8<T67 / CT7<2.3.

[0013] In one implementation, a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens may satisfy: 1.0<CT6 / ET6<1.5.

[0014] In one embodiment, a center thickness CT5 of the fifth lens on the optical axis and an edge thickness ET5 of the fifth lens may satisfy: 2.0<CT5 / ET5<2.6.

[0015] 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: -3.5<f4 / R7<1.1.

[0016] In one embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and an effective focal length f5 of the fifth lens may satisfy: -2.0<R10 / f5<-1.5.

[0017] Another aspect of 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 positive 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; wherein the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis can satisfy: 1.8<T67 / CT7<2.3.

[0018] In one embodiment, the aperture number Fno of the optical imaging system may satisfy: Fno≤1.9.

[0019] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 40°<Semi-FOV<45°.

[0020] In one embodiment, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy: 1.0<f3 / f4<2.0.

[0021] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens may satisfy: -3.0<f2 / f1<-2.0.

[0022] In one embodiment, a curvature radius R13 of the object-side surface of the seventh lens and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: 4.0<R13 / R14<4.6.

[0023] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy: 4.0<R3 / R4<8.2.

[0024] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis and half the diagonal length of the effective pixel area on the imaging surface ImgH may satisfy: 1.0<TTL / ImgH<1.3.

[0025] In one implementation, a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens may satisfy: 1.0<CT6 / ET6<1.5.

[0026] In one embodiment, a center thickness CT5 of the fifth lens on the optical axis and an edge thickness ET5 of the fifth lens may satisfy: 2.0<CT5 / ET5<2.6.

[0027] 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: -3.5<f4 / R7<1.1.

[0028] In one embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and an effective focal length f5 of the fifth lens may satisfy: -2.0<R10 / f5<-1.5.

[0029] The present application adopts seven lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned optical imaging system has at least one beneficial effect of ultra-thinness, good imaging quality, high resolution and low sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

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

[0032] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown; 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;

[0033] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown; 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;

[0034] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown; 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;

[0035] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown; FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system of Example 5 are respectively shown; and

[0036] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown; FIG. 12A to FIG. 12C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging system of Example 6 are respectively shown. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The features, principles and other aspects of the present application are described in detail below.

[0045] The optical imaging system according to the exemplary embodiment of the present application may include, for example, 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. Among the first lens to the seventh lens, any two adjacent lenses may have an air gap between them.

[0046] In an exemplary embodiment, the first lens may have positive power; the second lens may have positive power or negative power; the third lens may have positive power or negative power; the fourth lens may have positive power, and its image side surface may be convex; the fifth lens may have positive power or negative power; the sixth lens may have positive power or negative power, and its object side surface may be concave; the seventh lens may have positive power or negative power. By reasonably controlling the positive and negative distribution of the power of each component of the system and the curvature of the lens surface, the low-order aberrations of the control system can be effectively balanced. By reasonably distributing the power of the first lens and the second lens, the on-axis field of view of the optical imaging system can have smaller aberrations; the high-order aberrations of the optical imaging system can be balanced by reasonably distributing the power and surface shape of the fourth lens and the sixth lens.

[0047] In an exemplary embodiment, the optical imaging system may further include at least one aperture. The aperture may be disposed at an appropriate position as required, for example, between the second lens and the third lens. Adding an aperture may control the amount of light passing through the optical imaging system and improve the resolution of the optical imaging system; optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0048] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<TTL / ImgH<1.3, wherein TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging plane. The optical imaging system satisfies 1.0<TTL / ImgH<1.3 and may have the characteristic of being ultra-thin. More specifically, TTL and ImgH may satisfy: 1.20<TTL / ImgH<1.25.

[0049] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula Fno≤1.9, where Fno is the aperture number of the optical imaging system. Controlling the F number of the optical imaging system below 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 sensor. More specifically, Fno may satisfy: 1.80≤Fno≤1.90.

[0050] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 40°<Semi-FOV<45°, where Semi-FOV is half of the maximum field of view of the optical imaging system. The optical imaging system satisfies 40°<Semi-FOV<45°, so that it still has a good imaging range in a smaller volume. More specifically, Semi-FOV may satisfy: 42.5°<Semi-FOV<43.5°.

[0051] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<f3 / f4<2.0, where f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. The optical imaging system satisfies 1.0<f3 / f4<2.0, which is conducive to better balancing aberrations of the optical imaging system and improving resolution.

[0052] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -3.0<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. The optical imaging system satisfies -3.0<f2 / f1<-2.0, which is beneficial for the optical imaging system to better balance aberrations and improve resolution. More specifically, f2 and f1 may satisfy: -2.80<f2 / f1<-2.22.

[0053] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 4.0<R13 / R14<4.6, wherein R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens. The optical imaging system satisfies 4.0<R13 / R14<4.6, which is conducive to ensuring that the seventh lens has a suitable positive focal power, while reducing the angle between the main light and the optical axis when it is incident on the imaging surface, thereby improving the illumination of the imaging surface. More specifically, R13 and R14 may satisfy: 4.20<R13 / R14<4.60.

[0054] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 4.0<R3 / R4<8.2, where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. The optical imaging system satisfies 4.0<R3 / R4<8.2, which is conducive to reducing sensitivity while ensuring that the second lens has good processability.

[0055] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.8<T67 / CT7<2.3, wherein T67 is the spacing distance 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. The optical imaging system satisfies 1.8<T67 / CT7<2.3, which can ensure processing and assembly characteristics, and avoid problems such as interference between front and rear lenses during assembly due to too small a gap. At the same time, it is beneficial to slow down the deflection of light, adjust the field curvature of the optical imaging system, and reduce the sensitivity, thereby obtaining better imaging quality. More specifically, T67 and CT7 may satisfy: 1.80<T67 / CT7<2.10.

[0056] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<CT6 / ET6<1.5, wherein CT6 is the center thickness of the sixth lens on the optical axis, and ET6 is the edge thickness of the sixth lens. The optical imaging system satisfies 1.0<CT6 / ET6<1.5, which can reduce the difficulty of processing the sixth lens, and at the same time can reduce the angle between the main light and the optical axis when it is incident on the imaging surface, thereby improving the relative illumination of the imaging surface. More specifically, CT6 and ET6 can satisfy: 1.02<CT6 / ET6<1.25.

[0057] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 2.0<CT5 / ET5<2.6, where CT5 is the center thickness of the fifth lens on the optical axis, and ET5 is the edge thickness of the fifth lens. The optical imaging system satisfies 2.0<CT5 / ET5<2.6, which can ensure that the fifth lens has a good processing morphology. More specifically, CT5 and ET5 may satisfy: 2.20<CT5 / ET5<2.58.

[0058] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula: -3.5<f4 / R7<1.1, wherein 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. The optical imaging system satisfies: -3.5<f4 / R7<1.1, which can control the deflection angle of the edge field of view at the fourth lens and can effectively reduce the sensitivity of the system. More specifically, f4 and R7 can satisfy: -3.35<f4 / R7<1.10.

[0059] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -2.0<R10 / f5<-1.5, where R10 is the radius of curvature of the image side surface of the fifth lens, and f5 is the effective focal length of the fifth lens. The optical imaging system satisfies -2.0<R10 / f5<-1.5, which can effectively reduce sensitivity. More specifically, R10 and f5 may satisfy: -1.95<R10 / f5<-1.55.

[0060] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the seven lenses mentioned above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the thickness of the optical imaging system in the optical axis direction can be effectively reduced, the volume of the optical imaging system can be reduced, the sensitivity of the optical imaging system can be reduced, and the processability of the optical imaging system can be improved, so that the optical imaging system is more conducive to production and processing and can be applied to portable electronic products. At the same time, the optical imaging system of the present application also has excellent optical properties such as good imaging quality, good resolution, and high relative illumination.

[0061] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical mirror surfaces.

[0062] 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.

[0063] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0064] Example 1

[0065] 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.

[0066] like Figure 1As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0067] 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 convex. The fourth lens E4 has positive 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0068] Table 1 shows the basic parameters 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).

[0069]

[0070] Table 1

[0071] In Example 1, the total effective focal length f of the optical imaging system is 4.97 mm, the aperture number Fno of the optical imaging system is 1.84, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.89 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half of the maximum field of view angle Semi-FOV is 43.0°.

[0072] 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:

[0073]

[0074] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 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 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0075] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.0126E-02 -6.7027E-03 -3.9060E-03 -1.3800E-03 -4.9083E-04 -8.6559E-05 -3.0458E-05 S2 -3.2828E-02 2.5314E-03 -1.8277E-03 1.2357E-04 -1.6557E-05 4.9302E-06 2.2834E-06 S3 1.7272E-02 1.0407E-02 -7.6010E-04 6.6228E-04 2.6168E-05 3.0690E-05 1.1550E-05 S4 3.7021E-02 7.5939E-03 5.7546E-04 6.6329E-04 2.1626E-04 9.9624E-05 5.0946E-05 S5 -8.8855E-02 -2.8430E-03 2.5695E-04 6.5191E-04 2.7542E-04 1.2893E-04 3.5196E-05 S6 -1.6502E-01 -6.2105E-03 6.0867E-04 1.2783E-03 4.3954E-04 1.7857E-04 5.0590E-05 S7 -2.9227E-01 1.5021E-02 -4.0971E-03 2.1263E-04 -6.5066E-04 -1.4057E-04 4.3224E-05 S8 -2.9066E-01 8.2395E-02 -1.1014E-02 -3.7039E-03 -3.2448E-04 6.7840E-05 2.6450E-04 S9 -1.0819E+00 8.4713E-03 3.8345E-02 1.4753E-02 -6.0436E-04 -3.8176E-03 -1.0908E-03 S10 -5.0869E-01 -8.3348E-02 1.2786E-02 -4.5437E-03 -4.2916E-03 2.8252E-03 -1.0424E-04 S11 -5.7010E-01 -9.3393E-02 5.0839E-02 8.9919E-03 -2.3625E-03 1.7312E-03 -2.0432E-03 S12 -4.7353E-01 -6.6879E-02 8.1934E-02 1.2579E-02 -1.9960E-03 -6.7410E-03 -4.2982E-05 S13 -2.4799E+00 1.2799E+00 -5.7960E-01 2.5836E-01 -1.2052E-01 5.0102E-02 -2.1817E-02 S14 -7.7281E+00 1.6183E+00 -4.7593E-01 2.3871E-01 -1.0910E-01 3.6768E-02 -3.2218E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.2927E-05 7.7327E-07 8.7135E-06 7.6925E-09 1.8300E-06 -4.0169E-06 1.0820E-06 S2 2.8930E-06 2.8420E-07 2.2183E-07 -2.2095E-06 -2.1751E-06 6.3263E-07 4.1457E-07 S3 6.0568E-06 -1.8643E-06 4.4736E-07 -2.7476E-06 -2.6681E-06 -5.3396E-06 -6.6479E-07 S4 1.9569E-05 1.3270E-05 1.0296E-05 4.1318E-06 2.0577E-07 8.1401E-07 1.0169E-06 S5 1.8944E-05 -2.5096E-06 3.0702E-07 -4.6747E-06 -3.1749E-08 -4.1927E-06 -1.3713E-07 S6 1.6865E-05 -2.3636E-06 -2.9835E-06 -2.7899E-06 2.8538E-07 3.2676E-06 7.4501E-08 S7 1.6345E-04 6.4366E-05 7.4327E-05 3.2462E-05 5.4549E-05 2.7801E-05 2.7281E-05 S8 -1.2452E-04 -4.2249E-05 -9.2467E-05 1.3453E-05 -5.6065E-06 1.6097E-05 -6.5400E-06 S9 8.8850E-05 2.5492E-04 4.4922E-04 9.4241E-04 7.1510E-04 3.0180E-04 1.0733E-05 S10 1.5352E-03 -9.2895E-04 1.1877E-04 1.4305E-03 -2.1157E-04 1.1659E-04 3.1966E-06 S11 -2.7387E-04 -1.1434E-03 2.7468E-03 2.5125E-03 -2.9839E-03 -1.5521E-03 -5.4349E-04 S12 1.6371E-03 2.1585E-03 1.8485E-03 -1.8622E-03 -3.9242E-03 -6.7555E-04 -1.7760E-04 S13 4.6015E-03 -7.9580E-04 2.6054E-03 -2.2186E-03 2.6352E-04 1.0072E-03 -4.6331E-04 S14 1.1440E-02 -5.7866E-03 1.2941E-03 -6.8251E-04 2.4715E-03 -5.8270E-04 -1.7734E-04

[0076] Table 2

[0077] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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.

[0078] Example 2

[0079] 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.

[0080] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0081] 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 convex. The fourth lens E4 has positive 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 negative 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0082] In Example 2, the total effective focal length f of the optical imaging system is 4.98 mm, the aperture number Fno of the optical imaging system is 1.84, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.94 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half maximum field of view angle Semi-FOV is 42.9°.

[0083] 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). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0084]

[0085] Table 3

[0086]

[0087]

[0088] Table 4

[0089] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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 4C The 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. 4CIt can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0090] Example 3

[0091] 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.

[0092] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0093] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive 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 negative 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0094] In Example 3, the total effective focal length f of the optical imaging system is 5.02 mm, the aperture number Fno of the optical imaging system is 1.90, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.89 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half of the maximum field of view angle Semi-FOV is 42.7°.

[0095] 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). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0096]

[0097] Table 5

[0098]

[0099]

[0100] Table 6

[0101] Fig. 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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.

[0102] Example 4

[0103] 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.

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

[0105] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is 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 negative 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0106] In Example 4, the total effective focal length f of the optical imaging system is 4.98 mm, the aperture number Fno of the optical imaging system is 1.85, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.86 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half of the maximum field of view angle Semi-FOV is 43.0°.

[0107] 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). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0108]

[0109]

[0110] Table 7

[0111] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.7834E-02 -8.3494E-03 -3.8722E-03 -1.2606E-03 -3.8115E-04 -6.5507E-05 -1.2306E-05 S2 -3.4043E-02 2.7595E-03 -1.8939E-03 1.6520E-04 -2.3164E-05 5.3990E-06 3.3360E-06 S3 1.6436E-02 1.0880E-02 -1.1454E-03 6.5581E-04 -1.2219E-05 2.8963E-05 6.3091E-06 S4 3.5454E-02 7.9648E-03 3.2255E-04 5.2050E-04 1.4037E-04 4.8889E-05 3.5636E-05 S5 -8.4949E-02 -1.7020E-03 2.9516E-04 7.5202E-04 1.7677E-04 1.1476E-04 -5.6587E-06 S6 -1.6791E-01 -5.3945E-03 3.3399E-04 1.2670E-03 2.6724E-04 1.6409E-04 1.7991E-05 S7 -2.9207E-01 1.5089E-02 -4.1450E-03 1.8260E-04 -6.7894E-04 -1.4237E-04 5.4915E-05 S8 -2.8274E-01 8.2086E-02 -1.4295E-02 -3.8830E-03 1.9845E-05 5.4908E-04 2.7885E-04 S9 -1.0806E+00 8.9753E-03 3.8463E-02 1.4657E-02 -6.9046E-04 -3.8157E-03 -1.0055E-03 S10 -4.3863E-01 -1.3266E-01 -2.2922E-02 -1.1639E-02 -2.9905E-03 7.1743E-03 4.6362E-03 S11 -4.2757E-01 -1.1956E-01 4.7543E-02 1.8735E-02 4.7171E-03 2.2057E-03 -4.9789E-03 S12 -4.7399E-01 -6.6876E-02 8.1361E-02 1.2390E-02 -2.0267E-03 -6.7021E-03 2.1418E-05 S13 -2.4861E+00 1.2360E+00 -5.8383E-01 2.6010E-01 -1.1988E-01 5.0018E-02 -2.1740E-02 S14 -7.6705E+00 1.5833E+00 -5.0765E-01 2.1470E-01 -1.0789E-01 3.9616E-02 -3.3408E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.0152E-05 5.1550E-06 4.5218E-06 -1.9342E-07 -2.5659E-08 -2.3777E-06 6.4770E-07 S2 2.2572E-07 -7.7042E-07 -7.4122E-07 -2.1971E-06 -2.4186E-06 5.2708E-07 8.4558E-07 S3 2.7006E-06 -1.0963E-06 5.1670E-06 2.9415E-06 2.7500E-06 -1.3034E-06 5.5439E-07 S4 5.1339E-06 9.4590E-06 1.0371E-06 7.1081E-07 -4.4614E-06 -2.1076E-07 -7.1021E-07 S5 1.4145E-05 -1.3164E-05 4.5021E-06 -7.4280E-06 2.6705E-06 -3.1866E-06 2.4316E-06 S6 2.3797E-05 -5.9205E-06 3.7486E-06 -5.5612E-06 -2.2484E-07 -2.6648E-07 1.1616E-06 S7 5.1073E-05 2.8793E-05 3.2651E-05 1.3355E-05 1.6394E-05 7.3157E-06 7.7745E-06 S8 -1.2557E-04 2.5393E-05 -9.1214E-06 2.5321E-05 -6.4157E-06 1.4151E-05 -2.7105E-07 S9 1.2823E-04 2.7940E-04 4.4446E-04 7.7133E-04 5.9629E-04 2.8256E-04 1.2166E-04 S10 3.5968E-03 7.4590E-04 1.6814E-03 2.1326E-03 -4.5455E-04 -2.6599E-04 5.5312E-04 S11 -4.4319E-03 -2.5065E-03 2.2055E-03 2.0197E-03 -3.6099E-03 -1.7454E-03 4.0434E-04 S12 1.6730E-03 2.1607E-03 2.6170E-03 7.2247E-04 -1.7670E-03 4.3435E-04 7.3947E-04 S13 4.9109E-03 -8.6502E-04 2.2900E-03 -2.4324E-03 2.8918E-04 1.0131E-03 -4.0209E-04 S14 1.0318E-02 -6.6848E-03 1.6343E-04 -2.1933E-03 1.8237E-03 -6.3045E-04 -1.9284E-04

[0112] Table 8

[0113] Fig. 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Figure 8B An astigmatism curve of the optical imaging system 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 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.

[0114] Example 5

[0115] 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.

[0116] like Fig. 9 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0117] 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 positive 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0118] In Example 5, the total effective focal length f of the optical imaging system is 4.91 mm, the aperture number Fno of the optical imaging system is 1.84, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.89 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half of the maximum field of view angle Semi-FOV is 43.3°.

[0119] Table 9 shows the basic parameter table 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). Table 10 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0120]

[0121] Table 9

[0122]

[0123]

[0124] Table 10

[0125] Fig. 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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. 10CIt can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0126] Example 6

[0127] The following reference Figures 11 to 12C An optical imaging system according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging system according to Example 6 of the present application is shown.

[0128] like Fig.11 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0129] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is 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 optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0130] In Example 6, the total effective focal length f of the optical imaging system is 4.94 mm, the aperture number Fno of the optical imaging system is 1.84, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 5.87 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 4.84 mm, and the half of the maximum field of view angle Semi-FOV is 43.1°.

[0131] Table 11 shows the basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0132]

[0133] Table 11

[0134]

[0135]

[0136] Table 12

[0137] Fig. 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 12B An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 12C The distortion curve of the optical imaging system of Example 6 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 12A to FIG. 12C It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0138] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0139] Conditional formula\Example 1 2 3 4 5 6 TTL / ImgH 1.22 1.23 1.22 1.21 1.22 1.21 f2 / f1 -2.46 -2.42 -2.35 -2.27 -2.77 -2.43 f3 / f4 1.17 1.21 1.03 1.04 1.96 1.08 R13 / R14 4.53 4.24 4.28 4.31 4.55 4.53 R3 / R4 5.02 8.12 4.90 6.92 4.04 5.96 T67 / CT7 2.06 1.81 2.05 1.86 2.00 2.02 CT6 / ET6 1.17 1.13 1.04 1.05 1.22 1.19 CT5 / ET5 2.44 2.44 2.30 2.21 2.55 2.52 f4 / R7 -2.33 -2.25 -1.07 1.08 -3.34 -0.70 R10 / f5 -1.91 -1.62 -1.58 -1.56 -1.87 -1.86

[0140] Table 13

[0141] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0142] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging 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; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; Aperture; a third lens having positive refractive power; a fourth lens element having positive refractive power and a convex image-side surface; a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a sixth lens element having positive or negative refractive power, whose object-side surface is concave and whose image-side surface is convex; and The seventh lens element has a negative optical power, and its object side surface is convex and its image side surface is concave; The interval T67 between the sixth lens and the seventh lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis satisfy: 1.80<T67 / CT7<2.10; The number of lenses having optical power in the optical imaging system is seven.

2. The optical imaging system according to claim 1, characterized in that: The aperture number Fno of the optical imaging system satisfies: 1.80≤Fno≤1.

9.

3. The optical imaging system according to claim 1, characterized in that: Half of the maximum field of view Semi-FOV of the optical imaging system satisfies: 42.5°<Semi-FOV<43.5°.

4. The optical imaging system according to claim 1, characterized in that: The effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 1.0<f3 / f4<2.

0.

5. 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: -2.80<f2 / f1<-2.

22.

6. The optical imaging system according to claim 1, characterized in that: A curvature radius R13 of the object-side surface of the seventh lens and a curvature radius R14 of the image-side surface of the seventh lens satisfy: 4.20<R13 / R14<4.

6.

7. The optical imaging system according to claim 1, characterized in that: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy: 4.0<R3 / R4≤8.

12.

8. The optical imaging system according to claim 7, characterized in that: The distance TTL from the object side surface of the first lens to the imaging surface on the optical axis and half the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: 1.20<TTL / ImgH<1.

25.

9. The optical imaging system according to any one of claims 1 to 8, characterized in that: A center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: 1.02<CT6 / ET6<1.

25.

10. The optical imaging system according to any one of claims 1 to 8, characterized in that: A center thickness CT5 of the fifth lens on the optical axis and an edge thickness ET5 of the fifth lens satisfy: 2.20<CT5 / ET5<2.

58.

11. The optical imaging system according to any one of claims 1 to 8, characterized in that: The effective focal length f4 of the fourth lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: -3.35<f4 / R7<1.

10.

12. The optical imaging system according to any one of claims 1 to 8, characterized in that: A curvature radius R10 of the image-side surface of the fifth lens and an effective focal length f5 of the fifth lens satisfy: -1.95<R10 / f5<-1.55.

Images