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 negative optical power; a second lens with optical power, whose image side surface is convex; an aperture; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with positive optical power. Half of the maximum field of view Semi-FOV of the optical imaging system satisfies: Semi-FOV ≥ 55°; and the distance TTL from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfy: 3.0<TTL / ImgH<3.5.

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 rapid development of electronic products, portable and wearable electronic products such as smart phones and smart watches have become popular rapidly. Users have higher and higher requirements for the imaging technology of portable electronic products such as smart phones, which means more new requirements have been put forward for the imaging systems of portable electronic products such as smart phones. Therefore, many electronic product suppliers have invested a lot of time and energy in product innovation in order to improve the competitiveness of their products.

[0003] Since optical imaging systems with a large field of view can include more object information during imaging, have higher resolution and more satisfactory imaging effects, the large field of view characteristic will become an inevitable trend in the development of optical imaging systems mounted on portable electronic products. Summary of the invention

[0004] On the one hand, the present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with optical power, whose image side surface is convex; an aperture; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with positive optical power. Half of the maximum field of view angle Semi-FOV of the optical imaging system may satisfy: Semi-FOV ≥ 55°. The distance TTL from the object side surface of the first lens to the imaging plane of the optical imaging system on the optical axis and half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system ImgH may satisfy: 3.0<TTL / ImgH<3.5.

[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 effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy: -5.2<f6 / f5<-2.4.

[0007] In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens may satisfy: -7.5<f7 / f4<-5.0.

[0008] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: -3.0<f1 / f3<-2.0.

[0009] In one embodiment, the curvature radius R1 of the object-side surface of the first lens and the effective focal length f1 of the first lens may satisfy: -7.0≤R1 / f1≤-4.5.

[0010] In one embodiment, a curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R11 of the object-side surface of the sixth lens may satisfy: 2.4<|R10 / R11|<6.5.

[0011] In one embodiment, a curvature radius R6 of the image-side surface of the third lens and a curvature radius R13 of the object-side surface of the seventh lens may satisfy: -3.0<R6 / R13<-1.5.

[0012] In one embodiment, a curvature radius R2 of the image-side surface of the first lens, a curvature radius R3 of the object-side surface of the second lens, and a curvature radius R4 of the image-side surface of the second lens may satisfy: -3.0<(R3+R4) / R2<-1.5.

[0013] In one embodiment, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a spacing distance T12 between the first lens and the second lens on the optical axis may satisfy: 1.0<T12 / (CT1+CT2)<2.0.

[0014] In one embodiment, a center thickness CT7 of the seventh lens on the optical axis and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: 2.0<R14 / CT7<4.0.

[0015] In one embodiment, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 3.5<T67 / T45<5.5.

[0016] In one embodiment, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis may satisfy: 2.0<CT3 / CT4<4.0.

[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 negative optical power; a second lens with optical power, whose image side surface is convex; an aperture; a third lens with optical power; a fourth lens with negative optical power; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with positive optical power. Semi-FOV, half of the maximum field of view angle of the optical imaging system, can satisfy: Semi-FOV ≥ 55°; and the spacing distance T45 between the fourth lens and the fifth lens on the optical axis and the spacing distance T67 between the sixth lens and the seventh lens on the optical axis can satisfy: 3.5<T67 / T45<5.5.

[0018] In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy: -5.2<f6 / f5<-2.4.

[0019] In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens may satisfy: -7.5<f7 / f4<-5.0.

[0020] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: -3.0<f1 / f3<-2.0.

[0021] In one embodiment, the curvature radius R1 of the object-side surface of the first lens and the effective focal length f1 of the first lens may satisfy: -7.0≤R1 / f1≤-4.5.

[0022] In one embodiment, a curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R11 of the object-side surface of the sixth lens may satisfy: 2.4<|R10 / R11|<6.5.

[0023] In one embodiment, a curvature radius R6 of the image-side surface of the third lens and a curvature radius R13 of the object-side surface of the seventh lens may satisfy: -3.0<R6 / R13<-1.5.

[0024] In one embodiment, a curvature radius R2 of the image-side surface of the first lens, a curvature radius R3 of the object-side surface of the second lens, and a curvature radius R4 of the image-side surface of the second lens may satisfy: -3.0<(R3+R4) / R2<-1.5.

[0025] In one embodiment, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a spacing distance T12 between the first lens and the second lens on the optical axis may satisfy: 1.0<T12 / (CT1+CT2)<2.0.

[0026] In one embodiment, a center thickness CT7 of the seventh lens on the optical axis and a curvature radius R14 of the image-side surface of the seventh lens may satisfy: 2.0<R14 / CT7<4.0.

[0027] In one embodiment, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis may satisfy: 2.0<CT3 / CT4<4.0.

[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: 3.0<TTL / ImgH<3.5.

[0029] The present application provides an optical imaging system which is applicable to lightweight electronic products and has a large field of view, 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. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

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

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

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

[0039] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0040] FIG. 10A to FIG. 10DThe axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0041] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown; and

[0042] FIG. 12A to FIG. 12D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The features, principles and other aspects of the present application are described in detail below.

[0051] 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.

[0052] In an exemplary embodiment, the first lens may have negative power; the second lens may have positive power or negative power, and its image side surface may be convex; the third lens may have positive power or negative power; the fourth lens may have negative power; the fifth lens may have positive power or negative power; the sixth lens may have positive power or negative power; and the seventh lens may have positive power. By properly setting the power and surface characteristics of each lens, the low-order aberrations of the optical imaging system can be effectively balanced.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: Semi-FOV ≥ 55°, which is half of the maximum field of view of the optical imaging system. When Semi-FOV ≥ 55° is satisfied, the imaging range of the optical imaging system can be effectively controlled.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -5.2<f6 / f5<-2.4, where f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. Satisfying -5.2<f6 / f5<-2.4 is conducive to controlling the focal length of the rear part of the system within a smaller range, and can reduce the deflection angle of the light, thereby helping to reduce the sensitivity of the system.

[0055] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -7.5<f7 / f4<-5.0, wherein f4 is the effective focal length of the fourth lens, and f7 is the effective focal length of the seventh lens. More specifically, f7 and f4 may further satisfy: -7.2<f7 / f4<-5.2. Satisfying -7.5<f7 / f4<-5.0 can effectively correct the distortion of the paraxial region of the imaging surface, thereby facilitating the improvement of the imaging quality of the system.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -3.0<f1 / f3<-2.0, where f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. More specifically, f1 and f3 may further satisfy: -2.7<f1 / f3<-2.0. Satisfying -3.0<f1 / f3<-2.0 can both reasonably allocate the focal lengths of the lenses and balance the field curvature of the system.

[0057] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -7.0≤R1 / f1≤-4.5, where R1 is the radius of curvature of the object side of the first lens, and f1 is the effective focal length of the first lens. More specifically, R1 and f1 may further satisfy: -7.0≤R1 / f1≤-4.5. Satisfying -7.0≤R1 / f1≤-4.5 may enable the optical imaging system to have a better ability to balance astigmatism.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 2.4<|R10 / R11|<6.5, wherein R10 is the radius of curvature of the image side surface of the fifth lens, and R11 is the radius of curvature of the object side surface of the sixth lens. More specifically, R10 and R11 may further satisfy: 2.4<|R10 / R11|<6.2. Satisfying 2.4<|R10 / R11|<6.5 can effectively eliminate system spherical aberration, which is conducive to obtaining high-definition images.

[0059] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -3.0<R6 / R13<-1.5, where R6 is the radius of curvature of the image side of the third lens, and R13 is the radius of curvature of the object side of the seventh lens. More specifically, R6 and R13 may further satisfy: -2.4<R6 / R13<-1.5. Satisfying -3.0<R6 / R13<-1.5 is conducive to reasonably controlling the light deflection angle, so that the system can better match the commonly used chips.

[0060] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -3.0<(R3+R4) / R2<-1.5, wherein R2 is the radius of curvature of the image side surface of the first lens, 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. More specifically, R3, R4, and R2 may further satisfy: -2.8<(R3+R4) / R2<-1.8. Satisfying -3.0<(R3+R4) / R2<-1.5 can enable the optical imaging system to have a larger aperture to improve the overall brightness of the imaging.

[0061] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<T12 / (CT1+CT2)<2.0, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and T12 is the spacing distance between the first lens and the second lens on the optical axis. More specifically, T12, CT1, and CT2 may further satisfy: 1.4<T12 / (CT1+CT2)<1.7. Satisfying 1.0<T12 / (CT1+CT2)<2.0 can effectively regulate the distortion of the edge field of view of the imaging system, which is conducive to controlling the distortion amount of the edge field of view within a reasonable range.

[0062] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 2.0<R14 / CT7<4.0, wherein CT7 is the center thickness of the seventh lens on the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens. More specifically, R14 and CT7 may further satisfy: 2.4<R14 / CT7<3.7. Satisfying 2.0<R14 / CT7<4.0 can effectively control the incident angle of the light on the seventh lens, thereby improving the imaging quality of the optical imaging system.

[0063] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.5<T67 / T45<5.5, wherein T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis, and T67 is the spacing distance between the sixth lens and the seventh lens on the optical axis. More specifically, T67 and T45 may further satisfy: 3.6<T67 / T45<5.5. Satisfying 3.5<T67 / T45<5.5 can achieve the system's machinability and processability requirements while ensuring the compactness of the optical imaging system structure.

[0064] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 2.0<CT3 / CT4<4.0, wherein CT3 is the center thickness of the third lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. More specifically, CT3 and CT4 may further satisfy: 2.2<CT3 / CT4<4.0. Satisfying 2.0<CT3 / CT4<4.0 helps to evenly distribute the sizes of each lens, ensure assembly stability, and help reduce the overall aberration of the optical imaging system.

[0065] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.0<TTL / ImgH<3.5, 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: 3.0<TTL / ImgH<3.4. Satisfying 3.0<TTL / ImgH<3.5 can effectively control the overall size of the optical imaging system and meet the stability of assembly.

[0066] 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, high resolution, large field of view, ultra-thinness 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 focal length, surface shape, center thickness of each lens and axial spacing between each lens, the incident light can be effectively converged, the total optical length of the imaging system can be reduced, and the processability of the imaging lens can be improved, making the optical imaging system more conducive to production and processing.

[0067] 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.

[0068] 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.

[0069] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0070] Example 1

[0071] The following reference Figures 1 to 2D 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.

[0072] 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.

[0073] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. 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 convex, and its image side surface S8 is concave. 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 convex, and its image side surface S12 is concave. The seventh lens E7 has positive 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.

[0074] 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).

[0075]

[0076]

[0077] Table 1

[0078] In this example, the total effective focal length f of the optical imaging system is 1.53 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 7.21 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.19 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 55.7°, and the aperture value Fno of the optical imaging system is 2.20.

[0079] 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:

[0080]

[0081] 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, A76, A77, A8 10 , A 12 , A14 , A 16 , A 18 and A 20 .

[0082] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.9193E-01 -1.6093E-01 3.3396E-02 -7.8611E-03 2.3027E-03 -8.3507E-04 2.4904E-04 1.1235E-05 6.9216E-05 S2 5.3098E-01 -7.2800E-02 -2.5109E-02 -6.5592E-03 9.4276E-04 1.3872E-03 6.0692E-04 8.4683E-05 -3.0864E-05 S3 -2.4251E-02 7.7256E-03 6.6513E-04 1.0064E-04 1.0047E-05 -5.1264E-06 -1.7765E-06 -1.9235E-06 1.2764E-06 S4 3.8848E-02 2.9211E-03 4.1463E-04 6.3355E-05 2.8228E-05 6.6872E-07 3.2203E-06 -2.4914E-06 3.4591E-07 S5 1.7274E-02 -9.8323E-04 -1.4081E-04 -8.3461E-06 1.9941E-05 1.3713E-05 4.0101E-06 2.5276E-07 0.0000E+00 S6 1.5209E-02 -5.9623E-04 -4.9593E-04 -2.4066E-04 1.3098E-04 5.9674E-05 4.2386E-05 3.2367E-06 0.0000E+00 S7 -9.3655E-02 6.2274E-03 -1.3881E-03 -5.9104E-04 7.0717E-06 -2.1958E-05 2.5026E-05 2.8565E-06 0.0000E+00 S8 -1.2776E-01 1.0637E-02 -1.2046E-04 -7.9138E-04 5.5578E-05 -1.1780E-04 3.6735E-05 -2.7839E-06 0.0000E+00 S9 1.0281E-01 -1.7763E-02 1.8631E-03 -1.8720E-03 4.7931E-04 -3.0304E-04 7.1010E-05 -1.0475E-05 0.0000E+00 S10 2.6560E-01 -4.9440E-02 8.4547E-03 -4.1867E-03 1.8240E-03 -7.5457E-04 2.9275E-04 -6.2163E-05 0.0000E+00 S11 1.8498E-01 -3.5803E-02 2.0817E-03 -1.6598E-03 8.4838E-04 -4.6958E-04 1.8005E-04 -5.2158E-05 0.0000E+00 S12 1.3302E-01 5.4409E-03 -1.3507E-02 3.2568E-03 -3.9875E-04 1.5560E-04 -1.2761E-04 4.6276E-05 6.7503E-06 S13 -1.1832E+00 2.9992E-01 -5.1350E-02 4.0536E-03 -3.1418E-03 2.3971E-03 -8.8902E-04 3.9932E-05 0.0000E+00 S14 -7.8916E-01 1.7711E-01 -2.1791E-02 8.4880E-03 -5.0512E-03 8.1760E-04 -7.4684E-04 2.5439E-05 -8.8344E-05

[0083] Table 2

[0084] 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 represents the distortion magnitude values ​​corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 2A to FIG. 2D It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following reference Figures 3 to 4D 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.

[0087] 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.

[0088] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. 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 convex, and its image side surface S8 is concave. 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 positive 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.

[0089] In this example, the total effective focal length f of the optical imaging system is 1.47 mm, the total length TTL of the optical imaging system is 6.82 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.21 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 57.0°, and the aperture value Fno of the optical imaging system is 2.20.

[0090] 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.

[0091]

[0092]

[0093] Table 3

[0094] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.7876E-01 -1.5388E-01 3.6469E-02 -8.4809E-03 5.7347E-03 -1.3461E-03 3.1361E-04 -4.6522E-05 -2.6417E-05 S2 5.1533E-01 -6.4463E-02 -1.9466E-02 -5.4444E-03 3.4185E-03 2.4381E-03 3.7455E-04 -1.5569E-04 -7.3721E-05 S3 -4.0133E-02 1.4779E-02 7.4375E-04 -5.7656E-05 -7.5528E-05 4.6738E-06 -1.0907E-06 4.1959E-06 -2.3859E-07 S4 4.2900E-02 6.9954E-03 1.2637E-03 4.1893E-04 1.2745E-04 4.3713E-05 1.9137E-05 7.3250E-06 1.5317E-06 S5 6.9090E-03 4.2143E-04 3.1911E-05 7.6017E-05 5.9748E-06 1.5311E-05 5.3580E-06 3.8342E-06 0.0000E+00 S6 -1.1371E-02 5.5501E-03 -1.5989E-04 1.6801E-04 -2.3953E-06 1.0626E-05 1.0848E-05 6.8685E-07 0.0000E+00 S7 -9.4552E-02 1.5672E-02 -1.3829E-03 3.3846E-04 -1.6975E-04 2.2155E-05 7.2527E-06 1.5603E-06 0.0000E+00 S8 -9.2631E-02 1.2709E-02 -1.0046E-03 8.3234E-04 -2.0213E-04 5.1511E-06 -2.6015E-06 1.3535E-06 0.0000E+00 S9 9.0644E-02 -1.0966E-02 -6.7565E-04 -1.8621E-03 2.2795E-04 -1.9796E-04 8.6078E-06 -6.0569E-06 0.0000E+00 S10 2.0737E-01 -2.8490E-02 7.5417E-03 -8.6443E-03 2.6235E-03 -5.3790E-05 -3.5020E-05 -2.8192E-05 0.0000E+00 S11 2.8205E-01 -6.2855E-02 2.0802E-02 -5.1173E-03 1.8588E-03 -6.1562E-04 -6.7422E-05 7.0798E-05 0.0000E+00 S12 1.6520E-01 -3.7770E-03 -1.4359E-02 9.7813E-03 -2.0377E-03 4.5804E-04 -1.1464E-04 6.5524E-05 -3.3015E-05 S13 -1.3217E+00 3.2798E-01 -7.2870E-02 1.4433E-02 -3.9333E-03 1.1392E-03 -3.0932E-04 9.9684E-05 0.0000E+00 S14 -1.0052E+00 2.0080E-01 -4.2499E-02 1.6090E-02 -3.2654E-03 -1.6884E-04 -4.0743E-04 -1.9668E-04 1.0840E-04

[0095] Table 4

[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 4C The distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 4A to FIG. 4D 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 6D 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 negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. 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 concave. 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 concave. The seventh lens E7 has positive 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 1.68 mm, the total length TTL of the optical imaging system is 7.68 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.56 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 57.3°, and the aperture value Fno of the optical imaging system is 2.20.

[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). 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.

[0103]

[0104] Table 5

[0105]

[0106]

[0107] Table 6

[0108] 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 represents the distortion magnitude values ​​corresponding to different image heights. Fig.6D The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 6A to FIG. 6D It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0109] Example 4

[0110] The following reference Figures 7 to 8D 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.

[0111] 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.

[0112] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. 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 convex, and its image side surface S8 is concave. 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 concave. The seventh lens E7 has positive 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.

[0113] In this example, the total effective focal length f of the optical imaging system is 1.67 mm, the total length TTL of the optical imaging system is 7.70 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.56 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 57.4°, and the aperture value Fno of the optical imaging system is 2.20.

[0114] 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.

[0115]

[0116]

[0117] Table 7

[0118] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.5923E-01 -1.7709E-01 4.4794E-02 -6.5089E-03 5.6109E-03 -8.6602E-04 5.4157E-04 7.7908E-05 1.6293E-05 S2 6.1305E-01 -8.5008E-02 -2.7635E-02 -4.2209E-03 4.3064E-03 2.5235E-03 3.4188E-04 -1.3617E-04 -4.1828E-05 S3 -5.6740E-02 3.8919E-02 -5.3007E-02 9.2889E-02 -9.0594E-02 5.2786E-02 -1.5372E-02 6.7203E-04 4.2832E-04 S4 2.9583E-02 5.0991E-03 6.8989E-04 2.1087E-04 5.8717E-05 1.2127E-05 5.7100E-06 1.6929E-06 -3.3475E-07 S5 5.8965E-03 3.3235E-04 -4.8811E-05 6.2316E-05 -1.5018E-06 1.0544E-05 4.5101E-06 3.1803E-06 0.0000E+00 S6 -1.9963E-02 7.5656E-03 -3.5005E-04 1.7908E-04 -6.3565E-06 2.9205E-06 1.0021E-05 2.0368E-07 0.0000E+00 S7 -1.2333E-01 2.4114E-02 -2.9936E-03 6.1925E-04 -1.5908E-04 7.4911E-06 1.8284E-05 2.7676E-06 0.0000E+00 S8 -1.1030E-01 1.9498E-02 -2.3304E-03 1.2281E-03 -2.2667E-04 2.2903E-05 -5.4156E-06 1.2208E-05 0.0000E+00 S9 1.0191E-01 -1.3774E-02 -4.4951E-04 -2.2861E-03 1.3910E-04 -1.5923E-04 -3.3914E-05 1.2473E-05 0.0000E+00 S10 2.3450E-01 -3.1679E-02 8.6510E-03 -1.0758E-02 3.1709E-03 9.9032E-05 -8.2252E-05 -4.4435E-05 0.0000E+00 S11 3.4316E-01 -8.0017E-02 2.8674E-02 -7.8486E-03 2.6696E-03 -1.0402E-03 6.1055E-06 8.3660E-05 0.0000E+00 S12 -2.2819E-01 9.4865E-01 -1.5601E+00 1.9161E+00 -1.8404E+00 1.2376E+00 -5.2794E-01 1.2743E-01 -1.3233E-02 S13 -1.6403E+00 4.2468E-01 -1.0600E-01 2.0927E-02 -6.2177E-03 2.5495E-03 -1.2867E-03 3.1895E-04 0.0000E+00 S14 -1.3701E+00 2.8257E-01 -6.7648E-02 2.4535E-02 -1.0678E-02 7.1898E-04 -1.2341E-03 3.4894E-05 5.3694E-05

[0119] Table 8

[0120] 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 8C The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.8D The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 8A to FIG. 8D It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0121] Example 5

[0122] The following reference Figures 9 to 10D 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.

[0123] 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.

[0124] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. 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 concave. 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 positive 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.

[0125] In this example, the total effective focal length f of the optical imaging system is 1.68 mm, the total length TTL of the optical imaging system is 7.70 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.56 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 57.3°, and the aperture value Fno of the optical imaging system is 2.20.

[0126] 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.

[0127]

[0128] Table 9

[0129]

[0130]

[0131] Table 10

[0132] 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 represents the distortion magnitude values ​​corresponding to different image heights. Fig. 10DThe magnification chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 10A to FIG. 10D It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0133] Example 6

[0134] The following reference Figures 11 to 12D 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.

[0135] like Fig.11 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.

[0136] The first lens E1 has negative 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 convex. 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 convex, and its image side surface S8 is concave. 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 positive 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.

[0137] In this example, the total effective focal length f of the optical imaging system is 1.55 mm, the total length TTL of the optical imaging system is 7.04 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical imaging system is 2.32 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 56.7°, and the aperture value Fno of the optical imaging system is 2.20.

[0138] 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.

[0139]

[0140] Table 11

[0141] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.2448E-01 -1.5990E-01 4.2642E-02 -7.4716E-03 5.3459E-03 -1.5310E-03 2.6321E-04 -1.3375E-05 -1.1253E-04 S2 6.1780E-01 -1.1628E-01 -3.2733E-02 -3.0104E-03 6.7133E-03 2.0805E-03 -7.7406E-04 -6.2730E-04 -7.8450E-05 S3 -3.2819E-02 6.1062E-03 4.6134E-04 6.7233E-05 -4.1783E-05 8.5551E-06 -6.8919E-06 6.2514E-07 -1.7845E-06 S4 1.4375E-02 4.6902E-03 4.4444E-04 1.6386E-04 3.2103E-05 6.3652E-06 2.7716E-06 2.6911E-06 -1.5403E-06 S5 3.0357E-03 1.1136E-03 7.0027E-07 3.7130E-05 -3.0857E-05 1.5064E-06 2.2480E-06 2.2508E-06 -1.5403E-06 S6 -8.4613E-03 8.0498E-03 -1.2913E-05 3.5506E-05 -8.2847E-05 -1.2292E-05 1.0975E-05 1.1543E-06 0.0000E+00 S7 -1.1743E-01 2.0939E-02 -1.8128E-03 -1.0756E-04 -2.0939E-04 1.6736E-05 1.1435E-05 1.0167E-05 0.0000E+00 S8 -9.7985E-02 1.6704E-02 -5.8709E-04 6.0542E-04 -2.5559E-04 1.4660E-05 -2.0066E-05 1.5363E-05 0.0000E+00 S9 9.3446E-02 -1.3020E-02 -6.7755E-04 -2.0649E-03 -6.9409E-05 -1.6047E-04 -4.6022E-05 -6.7299E-06 0.0000E+00 S10 2.1686E-01 -2.9530E-02 7.4328E-03 -9.2464E-03 2.7178E-03 -5.3732E-05 3.6084E-05 -5.6722E-05 0.0000E+00 S11 3.1976E-01 -7.1811E-02 2.7160E-02 -6.0499E-03 1.8932E-03 -1.1884E-03 1.5999E-04 1.0671E-04 0.0000E+00 S12 1.9012E-01 -8.5098E-03 -1.4929E-02 1.2878E-02 -2.8318E-03 5.2728E-04 -8.3670E-05 7.7857E-05 -1.0104E-04 S13 -1.5363E+00 4.1480E-01 -1.0439E-01 2.0065E-02 -6.3202E-03 2.1619E-03 -1.0765E-03 1.2679E-04 0.0000E+00 S14 -1.1833E+00 2.5202E-01 -5.2757E-02 1.9768E-02 -1.1135E-02 -8.4123E-04 -1.0968E-03 -5.4645E-06 1.4285E-04

[0142] Table 12

[0143] Fig. 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. 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 represents the distortion magnitude values ​​corresponding to different image heights. Fig.12D The magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 12A to FIG. 12D It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

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

[0145] Conditional / Example 1 2 3 4 5 6 TTL / ImgH 3.29 3.09 3.00 3.00 3.00 3.03 f6 / f5 -2.47 -5.07 -4.57 -4.44 -5.01 -4.74 f7 / f4 -7.10 -6.62 -5.45 -5.27 -5.65 -6.88 f1 / f3 -2.16 -2.08 -2.12 -2.11 -2.14 -2.59 R1 / f1 -6.52 -5.65 -6.93 -6.94 -6.72 -4.50 |R10 / R11| 2.49 6.15 4.75 4.50 4.10 3.24 R6 / R13 -1.55 -2.29 -2.27 -2.28 -2.27 -2.28 (R3+R4) / R2 -1.92 -2.41 -2.57 -2.56 -2.58 -2.68 T12 / (CT1+CT2) 1.45 1.56 1.45 1.47 1.49 1.54 R14 / CT7 3.65 2.83 2.48 2.48 2.47 2.53 T67 / T45 5.48 3.65 3.93 3.90 3.92 3.71 CT3 / CT4 3.85 2.29 2.80 2.77 2.79 2.69

[0146] Table 13

[0147] 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.

[0148] 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 a negative optical power, and its object side surface is convex and its image side surface is concave; a second lens having optical power, wherein the object side surface is concave and the image side surface is convex; Aperture; The third lens has positive power, and its object side surface is convex and its image side surface is convex; a fourth lens element having negative optical power and a concave 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 having negative optical power; and The seventh lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The number of lenses having optical power in the optical imaging system is seven; Half of the maximum field of view (Semi-FOV) of the optical imaging system satisfies: 55.7°≤Semi-FOV≤57.4°; and A distance T45 between the fourth lens and the fifth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis satisfy: 3.65≤T67 / T45<5.

5.

2. The optical imaging system according to claim 1, characterized in that: The effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -5.07≤f6 / f5≤-2.

47.

3. The optical imaging system according to claim 1, characterized in that: The effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy: -7.10≤f7 / f4≤-5.

27.

4. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -2.59≤f1 / f3≤-2.

08.

5. 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 an effective focal length f1 of the first lens satisfy: -6.94≤R1 / f1≤-4.

5.

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 R11 of the object-side surface of the sixth lens satisfy: 2.49≤|R10 / R11|≤6.

15.

7. The optical imaging system according to claim 1, characterized in that: A curvature radius R6 of the image-side surface of the third lens and a curvature radius R13 of the object-side surface of the seventh lens satisfy: -2.29≤R6 / R13≤-1.

55.

8. The optical imaging system according to claim 1, characterized in that: A curvature radius R2 of the image-side surface of the first lens, a curvature radius R3 of the object-side surface of the second lens, and a curvature radius R4 of the image-side surface of the second lens satisfy: -2.68≤(R3+R4) / R2≤-1.

92.

9. The optical imaging system according to claim 1, characterized in that: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a spacing T12 between the first lens and the second lens on the optical axis satisfy: 1.45≤T12 / (CT1+CT2)≤1.

56.

10. The optical imaging system according to claim 1, characterized in that: A central thickness CT7 of the seventh lens on the optical axis and a curvature radius R14 of an image-side surface of the seventh lens satisfy: 2.47≤R14 / CT7≤3.

65.

11. The optical imaging system according to claim 1, characterized in that: A center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 2.29≤CT3 / CT4≤3.

85.

12. The optical imaging system according to any one of claims 2 to 11, 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: 3.0<TTL / ImgH≤3.29.

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