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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens with optical focal length, wherein the first lens, the third lens and the fourth lens all have positive optical focal length; half of the diagonal length ImgH on the imaging plane of the optical imaging system satisfies ImgH>5mm; the total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens satisfy 2.0<f3 / f<3.0.

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] In recent years, with the development of science and technology, the market demand for optical imaging systems suitable for portable electronic products (such as mobile phones) has gradually increased, especially optical imaging systems with high imaging quality have become more and more popular. At the same time, the technology of image sensors has been continuously improved, the number of pixels on image sensors has been continuously increased, and the size of single pixels has been continuously reduced, which also requires the imaging performance of optical imaging systems to be higher and higher.

[0003] Today’s portable electronic products are usually thin and light, for example, a mobile phone is only a few millimeters thick. The thinness of the product limits the total optical length of the optical imaging system used in it, which in turn increases the difficulty of designing the optical imaging system.

[0004] In order to meet the needs of miniaturization and satisfy the imaging requirements, an optical imaging system is needed that can take into account a large image surface, high imaging quality and miniaturization. Summary of the invention

[0005] The present application provides an optical imaging system that is applicable to portable electronic products and can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art.

[0006] 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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens with optical power, wherein the first lens, the third lens and the fourth lens can all have positive optical power.

[0007] In one embodiment, half of the diagonal length ImgH on the imaging plane of the optical imaging system may satisfy ImgH>5mm.

[0008] The total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens may satisfy 2.0<f3 / f<3.0.

[0009] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f7 of the seventh lens may satisfy 1.5<f2 / f7<2.0.

[0010] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens may satisfy 1.1<f6 / f1<2.0.

[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 2.5<R3 / R4<4.0.

[0012] In one embodiment, a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens may satisfy 1.4<R6 / R5<2.0.

[0013] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens may satisfy 1.0<R7 / R8<2.0.

[0014] In one embodiment, a curvature radius R12 of the image-side surface of the sixth lens and a curvature radius R13 of the object-side surface of the seventh lens may satisfy 1.2<R12 / R13<3.1.

[0015] In one embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens may satisfy 1.5<(R1+R9) / R10<2.5.

[0016] In one embodiment, a center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis may satisfy 3.0<CT1 / CT2<4.0.

[0017] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT3 of the third lens on the optical axis may satisfy 1.5<CT4 / CT3<3.5.

[0018] In one embodiment, a center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis may satisfy 1.3<CT6 / CT7≤2.8.

[0019] In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis may satisfy 1.5<T67 / T56<3.6.

[0020] In one embodiment, a distance T34 between the third lens and the fourth lens on the optical axis and a distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy 0.5<T34 / T45<1.5.

[0021] In one embodiment, the refractive index n2 of the second lens may satisfy n2>1.6, the refractive index n3 of the third lens may satisfy n3>1.6, and the refractive index n5 of the fifth lens may satisfy n5>1.6.

[0022] The present application adopts seven lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and the on-axis spacing between each lens, the above-mentioned optical imaging system has at least one beneficial effect of miniaturization, large image surface, high imaging quality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] 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. 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;

[0025] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown; 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

[0026] 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. 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;

[0027] 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. 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;

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

[0029] 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. 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;

[0030] Fig.13 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown; FIG. 14A to FIG. 14DThe axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 7 are respectively shown;

[0031] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown; FIG. 16A to FIG. 16D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 8 are shown respectively. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The features, principles and other aspects of the present application are described in detail below.

[0040] 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.

[0041] 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 object side and the first lens. 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.

[0042] In an exemplary embodiment, the first lens may have positive focal power, the second lens may have positive focal power and negative focal power, the third lens may have positive focal power, the fourth lens may have positive focal power, the fifth lens may have positive focal power and negative focal power, the sixth lens may have positive focal power and negative focal power, and the seventh lens may have positive focal power and negative focal power. The low-order aberrations of the control system are effectively balanced by reasonably controlling the positive and negative distribution of the focal power of each component of the system and the surface curvature of the lens. When the first lens has positive focal power, it is beneficial to converge the incident light of the optical imaging system; when the third lens has positive focal power, it is beneficial to compress the incident angle of the light at the aperture position, reduce the pupil aberration, and thus improve the imaging quality of the optical imaging system; when the fourth lens has positive focal power, it is beneficial to shorten the total optical length of the optical imaging system, and thus miniaturize the optical imaging system.

[0043] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula ImgH>5mm, where ImgH is half of the diagonal length on the imaging surface of the optical imaging system. More specifically, ImgH may satisfy ImgH>5.15mm. By controlling the image height of the optical imaging system, the optical imaging system can obtain more scene content during shooting, thereby enriching the imaging information.

[0044] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.5<f2 / f7<2.0, where f2 is the effective focal length of the second lens and f7 is the effective focal length of the seventh lens. More specifically, f2 and f7 satisfy 1.55<f2 / f7<1.90. By controlling the ratio of the effective focal length of the second lens to the effective focal length of the seventh lens, the deflection angle of the light in the optical imaging system can be reduced, thereby improving the imaging quality of the optical imaging system.

[0045] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 2.0<f3 / f<3.0, where f is the total effective focal length of the optical imaging system, and f3 is the effective focal length of the third lens. More specifically, f and f3 may satisfy 2.15<f3 / f<2.65. By constraining the effective focal length of the third lens, it is beneficial to obtain positive astigmatism at the third lens, which is suitable for offsetting the negative astigmatism generated in the object side direction of the third lens, thereby enabling the optical imaging system to have good imaging quality.

[0046] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.1<f6 / f1<2.0, where f1 is the effective focal length of the first lens and f6 is the effective focal length of the sixth lens. More specifically, f1 and f6 may satisfy 1.13<f6 / f1<1.73. By matching the effective focal length of the first lens with the effective focal length of the sixth lens, it is beneficial to balance the off-axis aberrations of the optical imaging system.

[0047] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 2.5<R3 / R4<4.0, 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. More specifically, R3 and R4 may satisfy 2.51<R3 / R4<3.57. By controlling the ratio of the radius of curvature of the two side mirror surfaces of the second lens, it is beneficial to correct the Petzval field curvature of the optical imaging system.

[0048] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.4<R6 / R5<2.0, wherein R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. More specifically, R5 and R6 may satisfy 1.47<R6 / R5<1.67. By controlling the ratio of the radius of curvature of the object side surface of the third lens to the radius of curvature of its image side surface, it is beneficial to make the incident angle of the light at the central field of view at the aforementioned two surfaces smaller, thereby reducing the Modulation Transfer Function (MTF) tolerance sensitivity of the central field of view.

[0049] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<R7 / R8<2.0, where R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. More specifically, R7 and R8 may satisfy 1.25<R7 / R8<1.95. By controlling the ratio of the radius of curvature of the object side surface of the fourth lens to the radius of curvature of the image side surface thereof, it is helpful to reduce the deflection angle of the light, thereby making the deflection of the light path in the optical imaging system better.

[0050] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.2<R12 / R13<3.1, wherein R12 is the radius of curvature of the image side surface of the sixth lens, and R13 is the radius of curvature of the object side surface of the seventh lens. More specifically, R12 and R13 may satisfy 1.28<R12 / R13<3.09. By matching the image side surface of the sixth lens with the object side surface of the seventh lens, it is beneficial to make the light of the edge field of view of the optical imaging system have a better angle, thereby effectively reducing the sensitivity of the optical imaging system.

[0051] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.5<(R1+R9) / R10<2.5, wherein R1 is the radius of curvature of the object side surface of the first lens, R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens. More specifically, R1, R9, and R10 may satisfy 1.54<(R1+R9) / R10<2.04. By matching the object side surface of the first lens with the two mirror surfaces of the fifth lens, it is helpful to control the bending direction and degree of bending of the first lens and the fifth lens, and the optical focal length of the first lens and the fifth lens can be effectively controlled, which is beneficial to control the field curvature at the first lens and the fifth lens, so as to improve the imaging quality of the optical imaging system.

[0052] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 3.0<CT1 / CT2<4.0, wherein CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. More specifically, CT1 and CT2 may satisfy 3.05<CT1 / CT2<3.85. By controlling the ratio of the center thickness of the first lens to the center thickness of the second lens, it is beneficial to make the first lens and the second lens have better processing properties, so that the two are easy to be molded, and it is beneficial to correct the off-axis coma of the optical imaging system.

[0053] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.5<CT4 / CT3<3.5, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT4 and CT3 may satisfy 1.6<CT4 / CT3<3.3. By controlling the ratio of the center thickness of the fourth lens to the center thickness of the third lens, it is beneficial to shorten the total optical length of the optical imaging system, making the optical imaging system ultra-thin, and in addition, the astigmatism of the off-axis field of view of the optical imaging system in the meridian direction and the sagittal direction can be corrected.

[0054] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.3<CT6 / CT7≤2.8, wherein CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis. By controlling the ratio of the center thickness of the sixth lens to the center thickness of the seventh lens, it is helpful to regulate the distortion amount of the optical imaging system, thereby controlling the distortion of the optical imaging system within a desired range.

[0055] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.5<T67 / T56<3.6, wherein T56 is the spacing distance between the fifth lens and the sixth 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, T56 and T67 may satisfy 1.62<T67 / T56<3.52. By matching the air spacing in the fifth lens to the seventh lens, it is beneficial to control the field curvature of the optical imaging system, thereby making the off-axis field of view of the optical imaging system have good imaging quality.

[0056] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<T34 / T45<1.5, wherein T34 is the distance between the third lens and the fourth lens on the optical axis, and T45 is the distance between the fourth lens and the fifth lens on the optical axis. More specifically, T34 and T45 may satisfy 0.9<T34 / T45<1.3. By controlling the air spacing between the third lens to the fifth lens, it is beneficial to control the field curvature contribution of each field of view within a desired range.

[0057] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula n2>1.6, n3>1.6, n5>1.6, wherein n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, and n5 is the refractive index of the fifth lens. By adopting a high refractive index material, the second lens, the third lens, and the fifth lens may have a higher refractive index. The high refractive index second lens and the third lens are beneficial to correcting the on-axis spherical aberration of the optical imaging system, thereby improving the imaging quality of the internal field of view. The high refractive index fifth lens is beneficial to correcting the off-axis coma of the optical imaging system, thereby improving the imaging quality of the external field of view.

[0058] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the seven lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, etc., the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more conducive to production and processing 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 large image surface and high imaging quality.

[0059] 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.

[0060] 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.

[0061] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0062] Example 1

[0063] 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.

[0064] like Figure 1 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0065] 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 negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0066] 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).

[0067]

[0068] Table 1

[0069] In Example 1, the total effective focal length f of the optical imaging system is 5.89 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 6.83 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 5.20 mm, the half of the maximum field of view angle Semi-FOV is 40.96°, and the aperture number Fno of the optical imaging system is 1.92.

[0070] 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:

[0071]

[0072] 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, 10 , A 12 , A 14 , A 16 , A 18 and A20 .

[0073] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.7129E-04 -3.5790E-03 -1.7510E-03 -6.2293E-04 -1.8084E-04 -3.3514E-05 -7.2523E-07 3.4216E-06 4.1990E-07 S2 -1.9169E-02 -1.5046E-03 7.9510E-04 -4.7427E-04 2.2595E-04 -2.1382E-05 -2.3760E-05 1.0290E-06 -2.2588E-06 S3 -4.6317E-02 1.0162E-02 2.7333E-03 4.6343E-04 3.0766E-04 -8.4092E-05 -9.2389E-05 -5.6617E-06 -9.1700E-06 S4 -6.7292E-02 6.5881E-03 -3.5281E-04 1.7263E-03 7.3433E-04 2.6411E-04 -5.2190E-05 -1.7488E-05 -1.1628E-05 S5 -4.6576E-02 1.7516E-02 -2.6746E-03 -1.3829E-03 -5.0475E-04 2.9239E-05 -3.9202E-06 3.2602E-05 1.2123E-05 S6 -3.8472E-04 1.0229E-02 2.2965E-03 5.4407E-04 8.0085E-05 7.1563E-06 -5.3283E-06 -5.0606E-06 -1.4985E-06 S7 -1.9904E-01 -3.3028E-03 1.1537E-02 8.0217E-03 3.9286E-03 1.6525E-03 5.8784E-04 1.7517E-04 3.9112E-05 S8 -4.0777E-01 -1.2650E-02 4.6636E-03 3.9986E-03 7.6216E-04 4.0398E-06 -2.2994E-04 -1.3686E-04 -4.7039E-05 S9 -1.2439E+00 5.1106E-02 6.1050E-03 1.0577E-02 -3.3061E-03 9.7613E-04 7.7305E-04 -1.3463E-04 -7.4892E-05 S10 -1.5651E+00 1.9271E-01 -3.6277E-02 -3.1992E-03 -1.0470E-03 1.0770E-02 7.5100E-03 2.2161E-03 5.7640E-04 S11 -1.0561E+00 4.2237E-02 4.7003E-02 -1.0375E-02 5.8837E-03 1.2592E-03 1.3886E-03 1.2733E-03 4.2886E-04 S12 2.2374E-01 4.7474E-02 4.2179E-02 -2.6998E-02 3.2353E-02 7.5152E-03 -1.5721E-04 1.3250E-03 4.5931E-04 S13 1.6883E+00 1.3663E-01 -1.0253E-01 7.2127E-03 2.4299E-02 -1.8539E-02 7.0725E-03 -1.5098E-03 1.4255E-04 S14 -2.7572E+00 3.4780E-01 3.9864E-03 1.5093E-02 -1.8126E-02 -1.4772E-02 3.3427E-03 -5.6782E-04 2.2282E-03

[0074] Table 2

[0075] 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 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 system. FIG. 2A to FIG. 2D It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0076] Example 2

[0077] The following reference Figures 3 to 4D The optical imaging system according to 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.

[0078] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0079] 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 concave. 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 concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0080] In Example 2, the total effective focal length f of the optical imaging system is 6.10 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.26 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 5.40 mm, the half of the maximum field of view angle Semi-FOV is 41.03°, and the aperture number Fno of the optical imaging system is 1.92.

[0081] 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.

[0082]

[0083] Table 3

[0084] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.4931E-05 -4.5359E-03 -2.2678E-03 -8.5613E-04 -2.7731E-04 -7.4964E-05 -1.6760E-05 -3.0059E-06 -9.6881E-07 S2 -1.8544E-02 -2.7415E-03 -6.3032E-04 -3.7118E-04 4.0219E-05 -1.5617E-05 -1.3970E-06 -5.0787E-06 -2.5828E-06 S3 -4.7687E-02 1.1968E-02 1.6062E-03 5.0192E-04 2.0517E-04 -7.2923E-05 -6.2213E-05 -2.9283E-05 -8.6529E-06 S4 -6.7951E-02 9.8391E-03 3.5577E-04 1.1823E-03 6.5089E-04 2.9034E-04 9.3943E-06 -3.3717E-05 -1.7216E-05 S5 -4.1593E-02 1.2719E-02 -3.7809E-03 -1.1398E-03 2.6133E-04 4.2253E-04 -7.1380E-05 -1.2997E-04 -4.5700E-05 S6 -3.0798E-03 9.1338E-03 1.7118E-03 4.6273E-04 4.0464E-05 1.4114E-06 -3.9223E-06 -1.3218E-06 -1.9046E-06 S7 -1.9903E-01 1.1087E-04 1.1212E-02 7.8036E-03 3.9672E-03 1.7614E-03 6.6069E-04 2.0064E-04 4.0119E-05 S8 -4.0944E-01 2.1212E-03 -7.3091E-04 1.3224E-03 9.3043E-05 7.6394E-05 -1.8092E-05 -1.1714E-05 -9.7716E-06 S9 -1.2569E+00 7.1731E-02 1.7246E-03 2.9626E-03 1.6296E-03 2.5233E-03 1.7549E-03 3.0739E-04 4.5340E-05 S10 -1.6500E+00 1.9480E-01 -2.2613E-02 -1.5361E-02 1.4435E-03 8.7880E-03 7.8568E-03 2.5328E-03 7.6853E-04 S11 -9.9336E-01 4.3680E-02 5.6468E-02 -5.1385E-04 7.4142E-03 6.2688E-04 9.3269E-04 1.4475E-03 5.1221E-04 S12 2.7458E-01 6.9445E-02 1.5368E-02 -2.7351E-02 2.7792E-02 5.6137E-03 -3.6535E-04 1.3639E-03 6.2297E-04 S13 1.7663E+00 1.4003E-01 -1.0776E-01 7.3239E-03 2.5333E-02 -1.9197E-02 7.3564E-03 -1.5709E-03 1.4546E-04 S14 -2.8605E+00 4.0650E-01 -2.7833E-02 1.7590E-02 -1.5596E-02 -1.0761E-02 3.1066E-03 -1.8645E-03 1.1098E-03

[0085] Table 4

[0086] 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 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 system. 4A to 4D It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0087] Example 3

[0088] 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.

[0089] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0090] 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 concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0091] In Example 3, the total effective focal length f of the optical imaging system is 6.43 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.64 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 5.60 mm, the half of the maximum field of view angle Semi-FOV is 40.59°, and the aperture number Fno of the optical imaging system is 1.92.

[0092] 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.

[0093]

[0094] Table 5

[0095] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.0322E-03 -4.0407E-03 -2.1045E-03 -8.0118E-04 -2.6402E-04 -7.3372E-05 -1.8056E-05 -3.7791E-06 -1.3051E-06 S2 -1.8406E-02 -2.5879E-03 -7.1661E-04 -3.2493E-04 1.9286E-05 -1.2187E-05 -3.2774E-07 -3.2136E-06 -8.4421E-07 S3 -5.0317E-02 1.2357E-02 1.3232E-03 5.8115E-04 2.2496E-04 -1.3049E-05 -2.5186E-05 -1.2446E-05 -3.2037E-06 S4 -6.9537E-02 1.0146E-02 4.0164E-04 1.2477E-03 7.3059E-04 3.6419E-04 6.6229E-05 -8.2291E-06 -8.7505E-06 S5 -4.1248E-02 1.0749E-02 -4.1481E-03 -1.0681E-03 5.6982E-04 6.2567E-04 3.7289E-05 -9.1353E-05 -3.6304E-05 S6 -3.6610E-03 8.8703E-03 1.6517E-03 4.1583E-04 3.2719E-05 6.3169E-07 -2.1838E-06 -5.1554E-07 -1.6409E-06 S7 -2.0491E-01 2.6400E-04 1.1032E-02 7.4212E-03 3.7342E-03 1.6598E-03 6.3076E-04 1.9426E-04 3.9216E-05 S8 -4.1499E-01 6.5559E-03 -1.3281E-03 1.1761E-03 -7.6463E-05 4.4389E-05 -2.5067E-05 -7.9488E-06 -9.2960E-06 S9 -1.2981E+00 7.8202E-02 -2.4088E-03 2.4688E-03 4.5003E-04 2.2159E-03 1.5855E-03 2.1124E-04 1.4371E-05 S10 -1.6957E+00 2.0445E-01 -2.5276E-02 -1.5057E-02 1.3103E-03 1.0008E-02 7.5392E-03 1.9520E-03 5.9502E-04 S11 -1.0505E+00 4.0336E-02 5.6489E-02 -4.3201E-03 4.0158E-03 3.3841E-04 1.4474E-03 1.4578E-03 4.2667E-04 S12 2.7945E-01 6.2434E-02 1.4101E-02 -3.5446E-02 2.4884E-02 2.8124E-03 -9.6635E-04 1.1030E-03 4.6549E-04 S13 1.8302E+00 1.4415E-01 -1.1199E-01 7.6633E-03 2.6291E-02 -1.9906E-02 7.6277E-03 -1.6292E-03 1.5104E-04 S14 -2.9804E+00 4.1376E-01 -3.6746E-02 1.9357E-02 -1.7194E-02 -9.7732E-03 3.4501E-03 -1.9923E-03 1.0401E-03

[0096] Table 6

[0097] 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 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 system. FIG. 6A to FIG. 6D It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0098] Example 4

[0099] 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.

[0100] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0101] 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 negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. 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 concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0102] In Example 4, the total effective focal length f of the optical imaging system is 6.42 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.75 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 5.80 mm, the half of the maximum field of view angle Semi-FOV is 41.60°, and the aperture number Fno of the optical imaging system is 1.92.

[0103] 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.

[0104]

[0105] Table 7

[0106] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 7.8403E-04 -5.1937E-03 -2.6493E-03 -1.0067E-03 -3.2688E-04 -9.1734E-05 -2.5690E-05 -7.8317E-06 -2.6942E-06 S2 -1.9846E-02 -3.4617E-03 -2.1689E-04 -4.9246E-04 8.5469E-05 -3.9296E-05 -1.7809E-05 -1.2158E-05 -6.9699E-06 S3 -5.1552E-02 1.2006E-02 2.4698E-03 3.8806E-04 1.2471E-04 -1.7739E-04 -1.3093E-04 -5.3656E-05 -1.8952E-05 S4 -7.3363E-02 1.0785E-02 4.8113E-04 1.3678E-03 5.5752E-04 2.3247E-04 -3.3253E-05 -3.9311E-05 -2.1946E-05 S5 -4.8294E-02 1.4573E-02 -3.6451E-03 -1.0191E-03 8.3786E-06 3.3753E-04 -3.4174E-05 -8.3477E-05 -3.7865E-05 S6 -3.6602E-03 9.0507E-03 1.8622E-03 5.3311E-04 7.7934E-05 9.2972E-06 -4.0742E-06 -3.4363E-06 -2.2168E-06 S7 -2.1448E-01 -2.4874E-03 1.2580E-02 9.1780E-03 4.8223E-03 2.1186E-03 7.7325E-04 2.2173E-04 4.0966E-05 S8 -4.4631E-01 -3.7338E-03 1.1088E-03 2.1106E-03 5.8038E-04 1.8752E-04 2.3029E-05 -1.7256E-05 -6.5311E-06 S9 -1.4014E+00 5.7154E-02 1.6516E-03 3.5078E-03 3.6484E-03 3.6779E-03 2.3397E-03 1.0769E-04 6.8825E-05 S10 -1.7527E+00 2.2659E-01 -2.8172E-02 -1.9859E-02 1.3064E-03 1.0038E-02 1.0971E-02 4.3393E-03 1.5120E-03 S11 -9.2691E-01 8.7427E-02 4.5053E-02 -3.1033E-04 1.2271E-02 2.8736E-03 3.2574E-03 2.8809E-03 8.7300E-04 S12 4.0785E-01 9.6311E-02 -9.5988E-04 -1.5432E-02 3.3673E-02 9.6298E-03 1.8321E-03 2.7697E-03 1.1491E-03 S13 1.9365E+00 1.5288E-01 -1.1572E-01 7.4913E-03 2.7137E-02 -2.0614E-02 7.9085E-03 -1.6843E-03 1.5668E-04 S14 -3.1642E+00 3.4502E-01 -2.6527E-02 1.4668E-02 -1.0328E-02 -1.2763E-02 1.9154E-03 -1.8887E-03 1.2326E-03

[0107] Table 8

[0108] 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 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 system. FIG. 8A to FIG. 8D It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0109] Example 5

[0110] 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.

[0111] like Fig. 9 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0112] 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 negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. 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 .

[0113] In Example 5, the total effective focal length f of the optical imaging system is 6.63 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.98 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.00 mm, the half of the maximum field of view angle Semi-FOV is 41.66°, and the aperture number Fno of the optical imaging system is 1.92.

[0114] 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.

[0115]

[0116] Table 9

[0117]

[0118]

[0119] Table 10

[0120] 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 represents the distortion magnitude values ​​corresponding to different image heights. Fig. 10D The 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 system. FIG. 10A to FIG. 10D It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0121] Example 6

[0122] 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.

[0123] like Fig.11As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0124] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. 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 negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0125] In Example 6, the total effective focal length f of the optical imaging system is 7.01 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 8.62 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.20 mm, the half of the maximum field of view Semi-FOV is 40.67°, and the aperture number Fno of the optical imaging system is 1.92.

[0126] 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.

[0127]

[0128]

[0129] Table 11

[0130] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -4.0906E-03 -6.4887E-03 -2.5802E-03 -8.1611E-04 -2.5486E-04 -8.5959E-05 -3.8842E-05 -1.6035E-05 -5.2825E-06 S2 1.9583E-02 -1.7115E-02 2.3322E-03 -2.7196E-03 3.0570E-04 -6.1209E-04 4.3600E-05 -5.9810E-05 2.9655E-05 S3 -3.6717E-02 4.5300E-03 3.7535E-03 -9.2683E-04 4.9945E-04 -2.3478E-04 3.2152E-05 -3.2721E-05 5.6332E-06 S4 -7.8911E-02 8.2250E-03 2.9685E-04 5.8567E-04 1.1930E-04 9.6362E-05 9.1951E-06 7.7869E-06 -1.9408E-06 S5 -3.0590E-02 6.1653E-03 -2.9075E-04 2.0652E-04 -8.6653E-05 6.5263E-05 2.7378E-05 1.6849E-05 2.7796E-06 S6 9.7456E-03 1.4846E-02 2.5004E-03 5.6225E-04 -5.9750E-05 -5.3786E-05 -2.1767E-05 -4.9430E-06 -1.1240E-07 S7 -1.9786E-01 -4.6196E-03 4.7424E-03 3.1077E-03 1.3392E-03 4.8761E-04 1.5022E-04 3.9888E-05 7.8870E-06 S8 -5.2839E-01 7.8586E-03 1.7405E-03 3.1162E-03 6.1170E-04 3.0547E-04 3.2257E-05 9.8307E-06 -2.6979E-06 S9 -1.1631E+00 5.7578E-02 -1.2279E-02 3.0004E-03 -3.3674E-03 -3.9169E-04 5.2427E-05 -4.3436E-05 9.0167E-06 S10 -1.5357E+00 1.7530E-01 -2.0093E-02 3.4753E-03 -5.0779E-03 6.8772E-05 1.3390E-04 -9.4737E-05 1.3942E-04 S11 -1.1297E+00 2.4061E-02 3.2499E-02 4.4550E-03 6.1123E-03 4.3843E-04 -5.3598E-04 -5.0965E-04 -6.0016E-05 S12 1.4967E-01 6.5817E-02 2.8921E-02 -3.0324E-02 1.0517E-02 2.0410E-03 -9.3017E-04 -1.3418E-04 1.8464E-04 S13 3.5141E+00 -5.4997E-03 -1.9331E-01 7.2025E-02 4.3533E-03 -2.8977E-02 2.0959E-02 -8.6630E-03 1.7320E-03 S14 -3.1755E+00 4.4835E-01 -1.5699E-01 -4.2796E-04 -2.5786E-02 -9.8740E-03 2.8764E-03 -4.3038E-03 1.7383E-03

[0131] Table 12

[0132] 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. 12BAn 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 system. FIG. 12A to FIG. 12D It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0133] Example 7

[0134] The following reference Figures 13 to 14D An optical imaging system according to Example 7 of the present application is described. Fig.13 A schematic structural diagram of an optical imaging system according to Example 7 of the present application is shown.

[0135] like Fig.13 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0136] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. 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 concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0137] In Example 7, the total effective focal length f of the optical imaging system is 7.38 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 8.97 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.40 mm, the half of the maximum field of view angle Semi-FOV is 40.45°, and the aperture number Fno of the optical imaging system is 1.92.

[0138] Table 13 shows the basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0139]

[0140] Table 13

[0141]

[0142]

[0143] Table 14

[0144] Fig.14A The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 14B An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 14C The distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14D The magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 14A to FIG. 14D It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0145] Example 8

[0146] The following reference Figures 15 to 16D An optical imaging system according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical imaging system according to Example 8 of the present application is shown.

[0147] like Fig.15 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0148] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. 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 concave. 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 concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The 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 .

[0149] In Example 8, the total effective focal length f of the optical imaging system is 7.69 mm, the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.33 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.60 mm, the half of the maximum field of view angle Semi-FOV is 39.95°, and the aperture number Fno of the optical imaging system is 1.92.

[0150] Table 15 shows the basic parameter table of the optical imaging system of Example 8, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 16 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 8, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0151]

[0152]

[0153] Table 15

[0154] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.2289E-03 -8.1708E-03 -3.2227E-03 -1.0182E-03 -2.9199E-04 -7.9131E-05 -2.6568E-05 -8.9944E-06 -3.2141E-06 S2 1.9283E-02 -2.2706E-02 2.7285E-03 -3.5038E-03 5.6927E-04 -7.8304E-04 1.4468E-04 -5.2831E-05 4.2018E-05 S3 -4.3738E-02 1.0790E-02 5.2914E-03 -1.7391E-03 3.9018E-04 -7.0082E-04 -4.1376E-06 -5.8526E-05 1.0483E-05 S4 -9.9791E-02 1.4630E-02 1.6280E-03 1.7135E-03 5.4389E-04 2.9293E-04 2.7431E-05 1.6327E-05 -6.5980E-06 S5 -3.4296E-02 7.9490E-03 -8.3070E-04 2.5253E-05 -1.6904E-04 1.3030E-04 4.9694E-05 2.3989E-05 2.9489E-06 S6 2.6354E-02 2.3832E-02 3.2250E-03 5.8384E-05 -5.5173E-04 -2.1601E-04 -6.6065E-05 -1.6664E-05 -4.3572E-06 S7 -2.2687E-01 -2.0769E-03 6.5009E-03 4.3512E-03 1.7824E-03 6.7007E-04 1.9624E-04 5.3065E-05 1.0873E-05 S8 -6.3127E-01 1.4784E-02 -2.4952E-03 3.5804E-03 -9.1818E-05 2.0140E-04 -1.4243E-04 -2.8992E-05 -2.8379E-05 S9 -1.4569E+00 8.3607E-02 -2.4587E-02 -2.0040E-03 -5.4511E-03 -5.6731E-04 -1.3653E-04 -1.0560E-04 -9.9834E-05 S10 -1.6802E+00 1.7390E-01 -1.6530E-02 -7.1271E-03 -6.6688E-03 -4.7278E-04 1.7760E-04 -3.5973E-04 -8.5924E-05 S11 -1.0050E+00 -1.3852E-02 5.0250E-02 7.2385E-04 2.1285E-03 -1.9985E-04 -4.3985E-05 -8.3233E-05 -1.3774E-06 S12 2.8569E-01 6.4051E-02 3.0653E-02 -3.2517E-02 1.7083E-02 2.7090E-03 -6.5022E-04 2.4493E-04 3.3190E-04 S13 4.4767E+00 -9.0341E-02 -2.3807E-01 1.0538E-01 -1.3622E-02 -2.8602E-02 2.6640E-02 -1.4651E-02 4.3918E-03 S14 -3.7783E+00 5.4055E-01 -1.8743E-01 -3.7572E-02 -4.9450E-02 -6.1113E-03 4.0823E-03 -4.0054E-03 2.1630E-03

[0155] Table 16

[0156] Fig.16A The axial chromatic aberration curve of the optical imaging system of Example 8 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 16B An astigmatism curve of the optical imaging system of Example 8 is shown, which indicates meridional image curvature and sagittal image curvature. Fig. 16C The distortion curve of the optical imaging system of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16DThe magnification chromatic aberration curve of the optical imaging system of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 16A to FIG. 16D It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0157] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0158]

[0159]

[0160] Table 17

[0161] 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.

[0162] 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: The optical axis includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens having optical power, wherein the first lens, the third lens, the fourth lens and the sixth lens all have positive optical power; the second lens and the seventh lens all have negative optical power; The object side surface of the first lens is convex, and the image side surface is concave or convex; The object side surface of the second lens is convex, and the image side surface is concave; The object side surface of the third lens is convex, and the image side surface is concave; The object side surface of the fourth lens is concave, and the image side surface is convex; The object side surface of the fifth lens is convex, and the image side surface is concave; The object side surface of the sixth lens is convex or concave, and the image side surface is convex; The object side surface of the seventh lens is concave, and the image side surface is concave or convex; The number of lenses having optical power in the optical imaging system is seven; Half of the diagonal length ImgH on the imaging plane of the optical imaging system satisfies 5.15mm<ImgH≤6.6mm; The total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens satisfy 2.15<f3 / f<2.65; A curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens satisfy 1.47<R6 / R5<1.

67.

2. 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 f7 of the seventh lens satisfy 1.55<f2 / f7<1.

90.

3. 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 f6 of the sixth lens satisfy 1.13<f6 / f1<1.

73.

4. 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 2.51<R3 / R4<3.

57.

5. The optical imaging system according to claim 1, characterized in that: A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy 1.25<R7 / R8≤1.

89.

6. The optical imaging system according to claim 1, characterized in that: A curvature radius R12 of the image-side surface of the sixth lens and a curvature radius R13 of the object-side surface of the seventh lens satisfy 1.28<R12 / R13<3.

09.

7. The optical imaging system according to claim 1, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens satisfy 1.54<(R1+R9) / R10<2.

04.

8. The optical imaging system according to claim 1, characterized in that: A center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy 3.05<CT1 / CT2<3.

85.

9. The optical imaging system according to claim 1, characterized in that: A center thickness CT4 of the fourth lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy 1.6<CT4 / CT3≤3.

22.

10. The optical imaging system according to claim 1, characterized in that: A center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy 1.3<CT6 / CT7≤2.

8.

11. The optical imaging system according to any one of claims 1 to 10, characterized in that: A distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T67 between the sixth lens and the seventh lens on the optical axis satisfy 1.62<T67 / T56<3.

52.

12. The optical imaging system according to any one of claims 1 to 10, characterized in that: A distance T34 between the third lens and the fourth lens on the optical axis and a distance T45 between the fourth lens and the fifth lens on the optical axis satisfy 0.9<T34 / T45<1.

3.

13. The optical imaging system according to any one of claims 1 to 10, characterized in that: The refractive index n2 of the second lens satisfies 1.6<n2≤1.67, the refractive index n3 of the third lens satisfies 1.6<n3≤1.65, and the refractive index n5 of the fifth lens satisfies 1.6<n5≤1.67.

Images