Optical imaging system

Abstract

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 with positive optical power; a third lens, whose object side surface is convex; a fourth lens, whose object side surface is convex and whose image side surface is convex; and a fifth lens, wherein the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy 0.5 <f1 / f2<2.5。

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, portable electronic products with camera functions have gradually emerged, and optical imaging systems, as an important component of camera systems, have gradually attracted public attention.

[0003] The photosensitive elements of general optical systems are mainly charge-coupled devices (CCD) or complementary metal oxide semiconductors (CMOS). With the improvement of semiconductor process technology and the reduction of pixel size of photosensitive elements, the optical imaging system installed in electronic products with camera functions needs to take into account the requirements of miniaturization and high imaging quality. Summary of the invention

[0004] The present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens; a second lens with positive optical power; a third lens, whose object side surface is convex; a fourth lens, whose object side surface is convex and whose image side surface is convex; and a fifth lens. The effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy: 0.5 <f1 / f2<2.5。

[0005] In some embodiments, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f2 of the second lens may satisfy: 1.0 <f123 / f2<3.5。

[0006] In some embodiments, the effective focal length f2 of the second lens and the combined focal length f234 of the second lens, the third lens and the fourth lens may satisfy: 1.5 <f2 / f234<2.5。

[0007] In some embodiments, the curvature radius R7 of the object-side surface of the fourth lens and the effective focal length f4 of the fourth lens may satisfy: 1.0 <R7 / f4<4.0。

[0008] In some embodiments, a curvature radius R6 of the image-side surface of the third lens, 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: 2.0<(R6+R7) / |R8|<6.0.

[0009] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens may satisfy: 2.0 <f1 / f4<5.0。

[0010] In some embodiments, a curvature radius R6 of the image-side surface of the third lens, a curvature radius R7 of the object-side surface of the fourth lens, and a total effective focal length f of the optical imaging system may satisfy: 1.9<(R6+R7) / f<4.0.

[0011] In some embodiments, the effective focal length f3 of the third lens and the curvature radius R8 of the image side surface of the fourth lens may satisfy: 1.5 <f3 / R8<3.5。

[0012] In some embodiments, the sum of the spacing distances ΣAT between any two adjacent lenses from the first lens to the fifth lens on the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 6.5<ΣAT / T34<11.5.

[0013] In some embodiments, the interval T12 between the first lens and the second lens on the optical axis, the interval T23 between the second lens and the third lens on the optical axis, the interval T34 between the third lens and the fourth lens on the optical axis, and the interval T45 between the fourth lens and the fifth lens on the optical axis may satisfy: T45 / (T12+T23+T34)>1.0.

[0014] In some embodiments, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, the on-axis distance SAG21 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis may satisfy: 0.5<(SAG11+SAG12) / CT1<1.2.

[0015] In some embodiments, a distance InTL from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis may satisfy: InTL / TTL≤0.60.

[0016] Another aspect of the present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens; a second lens having positive optical power; a third lens, whose object side surface is convex; a fourth lens, whose object side surface is convex and whose image side surface is convex; and a fifth lens. The spacing distance T12 between the first lens and the second lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, the spacing distance T34 between the third lens and the fourth lens on the optical axis, and the spacing distance T45 between the fourth lens and the fifth lens on the optical axis can satisfy: T45 / (T12+T23+T34)>1.0.

[0017] In some embodiments, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f2 of the second lens may satisfy: 1.0 <f123 / f2<3.5。

[0018] In some embodiments, the effective focal length f2 of the second lens and the combined focal length f234 of the second lens, the third lens and the fourth lens may satisfy: 1.5 <f2 / f234<2.5。

[0019] In some embodiments, the curvature radius R7 of the object-side surface of the fourth lens and the effective focal length f4 of the fourth lens may satisfy: 1.0 <R7 / f4<4.0。

[0020] In some embodiments, a curvature radius R6 of the image-side surface of the third lens, 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: 2.0<(R6+R7) / |R8|<6.0.

[0021] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens may satisfy: 2.0 <f1 / f4<5.0。

[0022] In some embodiments, a curvature radius R6 of the image-side surface of the third lens, a curvature radius R7 of the object-side surface of the fourth lens, and a total effective focal length f of the optical imaging system may satisfy: 1.9<(R6+R7) / f<4.0.

[0023] In some embodiments, the effective focal length f3 of the third lens and the curvature radius R8 of the image side surface of the fourth lens may satisfy: 1.5 <f3 / R8<3.5。

[0024] In some embodiments, the sum of the spacing distances ΣAT between any two adjacent lenses from the first lens to the fifth lens on the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 6.5<ΣAT / T34<11.5.

[0025] In some embodiments, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, the on-axis distance SAG21 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis may satisfy: 0.5<(SAG11+SAG12) / CT1<1.2.

[0026] In some embodiments, a distance InTL from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis and a distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis may satisfy: InTL / TTL≤0.60.

[0027] The present application provides a device that can be applied to lightweight electronic products and has at least one beneficial effect of miniaturization, high imaging quality, high system sensitivity, and ease of molding and processing by reasonably allocating the optical focal length, surface shape, center thickness of each lens, and axial spacing between lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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:

[0029] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

[0030] FIG. 2A to FIG. 2C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

[0031] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0032] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

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

[0034] FIG. 6A to FIG. 6C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 3 are respectively shown;

[0035] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0036] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 4 are respectively shown;

[0037] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0038] FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0039] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0040] FIG. 12A to FIG. 12C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown;

[0041] Fig.13 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0042] FIG. 14A to FIG. 14C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 7 are respectively shown;

[0043] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0044] FIG. 16A to FIG. 16C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 8 are respectively shown;

[0045] Fig.17 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown; and

[0046] 18A to 18C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging system of Example 9 are respectively shown. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The features, principles and other aspects of the present application are described in detail below.

[0055] The optical imaging system according to the exemplary embodiment of the present application includes, for example, five lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in sequence from the object side to the image side along the optical axis of the optical imaging system. Among the first lens to the fifth lens, any two adjacent lenses may have an air gap between them.

[0056] In an exemplary embodiment, the first lens has a focal power; the second lens has a positive focal power; the third lens has a focal power, and its object side is convex; the fourth lens has a focal power, its object side is convex, and its image side is convex; the fifth lens has a focal power. By reasonably controlling the positive and negative distribution of the focal powers of the respective components of the optical imaging system and the curvature of the lens surface types, the imaging quality of the optical imaging system can be effectively improved.

[0057] In an exemplary embodiment, the optical imaging system of the present application can satisfy InTL / TTL ≤ 0.60, where InTL is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system. Satisfying InTL / TTL ≤ 0.60 can effectively control the total length of the optical imaging system and ensure the miniaturization of the system. More specifically, InTL and TTL can satisfy: 0.50 < InTL / TTL ≤ 0.60.

[0058] In an exemplary embodiment, the optical imaging system of the present application can satisfy 0.5 < f1 / f2 < 2.5, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. Satisfying 0.5 < f1 / f2 < 2.5 is beneficial to correcting the spherical aberration of the optical imaging system. More specifically, f1 and f2 can satisfy: 0.9 < f1 / f2 < 2.2.

[0059] In an exemplary embodiment, the optical imaging system of the present application can satisfy 1.0 < f123 / f2 < 3.5, where f123 is the combined focal length of the first lens, the second lens, and the third lens, and f2 is the effective focal length of the second lens. Satisfying 1.0 < f123 / f2 < 3.5 can effectively control the contribution of the first lens, the second lens, and the third lens to the spherical aberration, realize the correction of the spherical aberration of the optical system, and improve the imaging quality of the optical imaging system. More specifically, f123 and f2 can satisfy: 1.0 < f123 / f2 < 3.3.

[0060] In an exemplary embodiment, the optical imaging system of the present application can satisfy 1.5 < f2 / f234 < 2.5, where f2 is the effective focal length of the second lens and f234 is the combined focal length of the second lens, the third lens, and the fourth lens. Satisfying 1.5 < f2 / f234 < 2.5 is beneficial to correcting the lateral chromatic aberration and axial chromatic aberration of the optical imaging system, and is also beneficial to the forming process of the optical imaging system. More specifically, f2 and f234 can satisfy: 1.6 < f2 / f234 < 2.5.

[0061] In an exemplary embodiment, the optical imaging system of the present application may satisfy 1.0 < R7 / f4 < 4.0, where R7 is the radius of curvature of the object side surface of the fourth lens, and f4 is the effective focal length of the fourth lens. Reasonably controlling the ratio of R7 to f4 is beneficial to reducing the stray light generated by the object side surface of the fourth lens, and can also avoid excessive bending of the fourth lens, which is beneficial to processing and forming. As an example, R7 and f4 may satisfy: 1.2 < R7 / f4 < 4.0.

[0062] In an exemplary embodiment, the optical imaging system of the present application may satisfy 2.0 < (R6 + R7) / |R8| < 6.0, where R6 is the radius of curvature of the image side surface of the third lens, 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. Satisfying 2.0 < (R6 + R7) / |R8| < 6.0 is beneficial to correcting the astigmatism and field curvature of the off-axis field of the system. More specifically, R6, R7, and R8 may satisfy: 2.5 < (R6 + R7) / |R8| < 5.5.

[0063] In an exemplary embodiment, the optical imaging system of the present application may satisfy 2.0 < f1 / f4 < 5.0, where f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens. Satisfying 2.0 < f1 / f4 < 5.0 can ensure that the optical imaging system has a low tolerance sensitivity and is beneficial to correcting the spherical aberration and astigmatism of the system. More specifically, f1 and f4 may satisfy: 2.5 < f1 / f4 < 4.5.

[0064] In an exemplary embodiment, the optical imaging system of the present application may satisfy 1.9 < (R6 + R7) / f < 4.0, where R6 is the radius of curvature of the image side surface of the third lens, R7 is the radius of curvature of the object side surface of the fourth lens, and f is the total effective focal length of the optical imaging system. Reasonably controlling the relationship among R6, R7, and f is beneficial to reducing the risk of ghost images generated by the third lens and the fourth lens, and improving the imaging quality of the optical imaging system. As an example, R6, R7, and f may satisfy: 2.5 < (R6 + R7) / f < 5.5.

[0065] In an exemplary embodiment, the optical imaging system of the present application may satisfy 1.5 < f3 / R8 < 3.5, where f3 is the effective focal length of the third lens, and R8 is the radius of curvature of the image side surface of the fourth lens. Satisfying 1.5 < f3 / R8 < 3.5 is beneficial to reducing the stray light generated by the object side surface of the fourth lens and is beneficial to the forming and assembly of the lens. More specifically, f3 and R8 may satisfy: 1.6 < f3 / R8 < 3.4.

[0066] In an exemplary embodiment, the optical imaging system of the present application may satisfy 6.5<ΣAT / T34<11.5, where ΣAT is the sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. Reasonable control of the ratio of ΣAT to T34 is conducive to adjusting the light distribution on the third lens and the fourth lens, reducing the sensitivity of the optical imaging system, and improving the production yield. As an example, ΣAT and T34 may satisfy: 6.5<ΣAT / T34<10.

[0067] In an exemplary embodiment, the optical imaging system of the present application may satisfy 0.5<(SAG11+SAG12) / CT1<1.2, wherein SAG11 is the on-axis distance between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and CT1 is the center thickness of the first lens on the optical axis. Satisfying 0.5<(SAG11+SAG12) / CT1<1.2 is conducive to reasonably controlling the shape of the first lens, thereby improving the processability of the first lens. At the same time, a reasonable setting of the first lens is also conducive to correcting the off-axis aberration of the optical imaging system. More specifically, SAG11, SAG12 and CT1 may satisfy: 0.6<(SAG11+SAG12) / CT1<1.2.

[0068] In an exemplary embodiment, the optical imaging system of the present application may satisfy T45 / (T12+T23+T34)>1.0, wherein T12 is the spacing distance between the first lens and the second lens on the optical axis, T23 is the spacing distance between the second lens and the third lens on the optical axis, T34 is the spacing distance between the third lens and the fourth lens on the optical axis, and T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis. By controlling the ratio of the spacing between the fourth lens to the fifth lens on the optical axis to the spacing between the first lens to the fourth lens on the optical axis, the ghosting of the optical imaging system can be well corrected. In addition, a reasonable spacing arrangement can give the system better assembly properties and improve production yield. More specifically, T12, T23, T34 and T45 may satisfy: 1.0<T45 / (T12+T23+T34)<2.2.

[0069] 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.

[0070] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the five lenses described above. The present application provides an optical imaging system that can take into account both miniaturization and high imaging quality. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between each lens, etc., the volume of the optical imaging system can be effectively reduced, the sensitivity of the optical imaging system can be reduced, and the processability of the camera lens group can be improved, so that the optical imaging system is more conducive to production and processing and can be applied to portable electronic products.

[0071] 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 fifth 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 and the fifth 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 and the fifth lens are all aspherical mirror surfaces.

[0072] 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 five lenses are described as an example in the embodiment, the optical imaging system is not limited to including five lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0073] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0074] Example 1

[0075] The following references Figures 1 to 2C An optical imaging system according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0076] like Figure 1 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0077] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E8 has an object side surface S11 and an image side surface S12. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0078] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0079]

[0080]

[0081] Table 1

[0082] In Example 1, the total effective focal length f of the optical imaging system is 3.11 mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.49 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.58 mm, the value of half the maximum field of view angle Semi-FOV is 44.37°, and the value of the aperture number Fno of the optical imaging system is 2.14.

[0083] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0084]

[0085] 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 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1 to S10 in Example 1.

[0086] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.4177E-02 -4.4775E-02 1.9864E-02 -6.6808E-03 1.5422E-03 -2.2111E-04 1.5733E-05 -1.2310E-08 -4.7739E-08 S2 1.2333E-01 -5.8459E-02 1.4801E-02 9.5588E-03 -1.4816E-02 7.7166E-03 -2.0128E-03 2.6518E-04 -1.4115E-05 S3 -2.2581E-03 -6.5514E-02 2.7242E-02 8.0373E-03 -1.1096E-01 1.9251E-01 -1.3984E-01 4.7670E-02 -6.3434E-03 S4 3.2909E-02 -2.9585E-01 1.8302E+00 -7.6161E+00 1.9872E+01 -3.2490E+01 3.2469E+01 -1.8096E+01 4.3194E+00 S5 -8.1474E-03 3.2979E-02 -4.1731E-01 1.9894E+00 -5.8949E+00 1.0969E+01 -1.2516E+01 8.0166E+00 -2.2137E+00 S6 -6.2727E-02 1.2215E-01 -2.1841E-01 2.0078E-01 -9.4155E-03 -2.5174E-01 3.2155E-01 -1.7671E-01 3.7447E-02 S7 -1.2437E-01 1.5099E-01 -2.5987E-01 3.6091E-01 -3.6217E-01 2.4142E-01 -9.9424E-02 2.2468E-02 -2.0806E-03 S8 -7.3321E-02 3.7386E-02 -2.2649E-02 1.4817E-02 -8.7661E-03 3.8141E-03 -1.0631E-03 1.6483E-04 -1.0655E-05 S9 -3.1664E-03 -1.6158E-02 8.6227E-02 -1.8257E-01 2.3222E-01 -2.0077E-01 1.2370E-01 -5.4163E-02 1.6336E-02 S10 -2.3277E-01 3.9139E-02 5.8745E-02 -9.0865E-02 6.8815E-02 -3.1765E-02 8.6923E-03 -1.0323E-03 -1.1609E-04

[0087] Table 2

[0088] 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 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 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. 2C It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0089] Example 2

[0090] The following references Figures 3 to 4C Describe the optical imaging system according to Example 2 of the present application. Figure 3 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0091] like Figure 3 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0092] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E8 has an object side surface S11 and an image side surface S12. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0093] Table 3 shows the basic parameter table of the optical imaging system of Example 2, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0094]

[0095] Table 3

[0096] In Example 2, the total effective focal length f of the optical imaging system is 3.30 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 4.33 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.55 mm, the value of half the maximum field of view angle Semi-FOV is 43.92°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0097] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0098] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 9.5575E-02 -5.2294E-03 -2.4769E-01 7.9217E-01 -1.3038E+00 1.2091E+00 -4.7995E-01 0.0000E+00 S2 8.4808E-02 -1.8331E-01 1.7886E-01 -3.3995E-03 -5.9922E-01 1.2676E+00 -5.1055E-01 0.0000E+00 S3 -1.2287E-01 8.9457E-02 -1.8584E+00 7.1893E+00 -1.5108E+01 1.6484E+01 -6.7905E+00 0.0000E+00 S4 -2.1458E-01 7.4761E-01 -5.2297E+00 1.5058E+01 -2.2556E+01 1.7311E+01 -5.3397E+00 0.0000E+00 S5 -3.8125E-01 1.2738E+00 -5.9697E+00 1.5092E+01 -2.0752E+01 1.4656E+01 -4.1501E+00 0.0000E+00 S6 -3.9079E-01 8.3382E-01 -2.3660E+00 4.2532E+00 -4.6127E+00 2.7479E+00 -6.8818E-01 0.0000E+00 S7 -2.8891E-02 1.1189E-02 -1.5956E-01 2.9555E-01 -4.2316E-01 4.7804E-01 -2.6688E-01 5.2595E-02 S8 -5.2601E-03 -5.6832E-02 2.3900E-01 -4.7573E-01 5.2953E-01 -3.5195E-01 1.3517E-01 -2.2543E-02 S9 -4.9344E-01 3.0815E-01 3.4816E-02 -3.2255E-01 3.2901E-01 -1.6527E-01 4.3420E-02 -4.7470E-03 S10 -3.0306E-01 3.1969E-01 -2.4796E-01 1.3013E-01 -4.5671E-02 1.0177E-02 -1.2976E-03 7.2122E-05

[0099] Table 4

[0100] 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 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 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. 4C It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0101] Example 3

[0102] The following will refer to Figures 5 to 6C An optical imaging system according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown.

[0103] like Figure 5 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0104] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E8 has an object side surface S11 and an image side surface S12. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0105] Table 5 shows a basic parameter table of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0106]

[0107] Table 5

[0108] In Example 3, the total effective focal length f of the optical imaging system is 2.98 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 4.12 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.50 mm, the value of half the maximum field of view Semi-FOV is 48.85°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0109] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0110]

[0111]

[0112] Table 6

[0113] 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 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 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. 6C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0114] Example 4

[0115] The following will refer to Figures 7 to 8C An optical imaging system according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown.

[0116] like Figure 7 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0117] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0118] Table 7 shows a basic parameter table of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0119]

[0120]

[0121] Table 7

[0122] In Example 4, the total effective focal length f of the optical imaging system is 3.65 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 4.87 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.55 mm, the value of half the maximum field of view Semi-FOV is 36.27°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0123] Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0124] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 8.4715E-02 -8.7892E-03 -1.0870E-01 4.9716E-01 -9.9408E-01 1.0228E+00 -4.0032E-01 0.0000E+00 S2 5.4255E-02 -1.1556E-01 3.4988E-01 -1.1126E+00 2.4990E+00 -3.0999E+00 1.7957E+00 0.0000E+00 S3 -1.1458E-01 -9.6513E-02 -3.3659E-01 1.3949E+00 -2.7476E+00 2.4994E+00 -5.4867E-01 0.0000E+00 S4 -2.3073E-01 1.2437E-01 -6.4649E-01 1.8396E+00 -3.0498E+00 2.7680E+00 -1.0165E+00 0.0000E+00 S5 -3.6439E-01 4.3046E-01 -9.2594E-01 1.8722E+00 -2.8865E+00 2.6270E+00 -9.8808E-01 0.0000E+00 S6 -3.4539E-01 3.3469E-01 -4.2917E-01 3.6656E-01 -3.2054E-01 2.5928E-01 -9.1046E-02 0.0000E+00 S7 -4.2264E-02 -5.6913E-02 1.1835E-01 -9.2499E-02 -5.8698E-02 1.8578E-01 -1.1804E-01 2.3480E-02 S8 1.9779E-02 -4.0672E-02 7.6795E-02 -9.0144E-02 5.9987E-02 -1.7577E-02 1.7791E-04 7.2675E-04 S9 -3.7485E-01 2.7480E-01 -2.2303E-01 2.0719E-01 -1.7752E-01 1.0328E-01 -3.3305E-02 4.4444E-03 S10 -2.1256E-01 1.8926E-01 -1.2397E-01 5.6042E-02 -1.7013E-02 3.2961E-03 -3.6762E-04 1.7936E-05

[0125] Fig. 8AThe 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 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 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. 8C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0126] Example 5

[0127] The following will refer to Figures 9 to 10C An optical imaging system according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging system according to Example 5 of the present application is shown.

[0128] like Fig. 9 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0129] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0130] Table 9 shows a basic parameter table of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0131]

[0132]

[0133] Table 9

[0134] In Example 5, the total effective focal length f of the optical imaging system is 2.70 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 3.88 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.00 mm, the value of half the maximum field of view angle Semi-FOV is 43.90°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0135] Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0136] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 9.9454E-02 -2.1844E-02 -3.6593E-01 2.0997E+00 -6.2901E+00 9.8050E+00 -6.2186E+00 0.0000E+00 S2 7.7440E-02 -2.1825E-01 4.3870E-01 -2.0639E+00 6.7947E+00 -1.1310E+01 8.3504E+00 0.0000E+00 S3 -1.3482E-01 -2.0638E-01 2.3514E-01 -1.3751E+00 4.8692E+00 -8.3016E+00 6.7883E+00 0.0000E+00 S4 -3.5127E-01 7.7497E-01 -3.6224E+00 1.0875E+01 -1.7830E+01 1.4881E+01 -4.8481E+00 0.0000E+00 S5 -4.5994E-01 1.1410E+00 -4.1620E+00 1.0753E+01 -1.6070E+01 1.2236E+01 -3.6911E+00 0.0000E+00 S6 -4.0787E-01 7.6905E-01 -1.8177E+00 3.0264E+00 -3.2873E+00 2.0387E+00 -5.3451E-01 0.0000E+00 S7 1.0034E-01 -7.3195E-01 2.3937E+00 -5.7833E+00 9.0665E+00 -8.9086E+00 4.9947E+00 1.2004E+00 S8 1.8344E-02 -1.2272E-01 3.1683E-01 -6.0827E-01 7.3935E-01 -5.5479E-01 2.2988E-01 -3.8913E-02 S9 -5.1089E-01 3.2645E-01 -1.7362E-01 9.3617E-02 -2.8847E-02 1.0136E-03 1.7799E-03 -3.4512E-04 S10 -2.7144E-01 2.1992E-01 -8.4680E-02 -1.1664E-02 2.7071E-02 -1.1526E-02 2.1230E-03 -1.4626E-04

[0137] Table 10

[0138] 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 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 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. 10C It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0139] Example 6

[0140] The following will refer to Figures 11 to 12C An optical imaging system according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging system according to Example 6 of the present application is shown.

[0141] like Fig.11 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0142] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0143] Table 11 shows a basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0144]

[0145] Table 11

[0146] In Example 6, the total effective focal length f of the optical imaging system is 3.58 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 4.89 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 3.10 mm, the value of half the maximum field of view angle Semi-FOV is 43.92°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0147] Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0148] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 8.4872E-02 -3.5720E-03 -1.4191E-01 6.1158E-01 -1.2398E+00 1.3020E+00 -5.3430E-01 0.0000E+00 S2 6.5085E-02 -1.2281E-01 3.1166E-01 -1.0727E+00 2.5333E+00 -3.3102E+00 1.9357E+00 0.0000E+00 S3 -9.8383E-02 -1.6578E-01 3.1614E-01 -1.5097E+00 3.8178E+00 -5.1428E+00 3.0186E+00 0.0000E+00 S4 -3.4382E-01 1.1529E+00 -4.6629E+00 1.0518E+01 -1.3723E+01 9.7460E+00 -2.9013E+00 0.0000E+00 S5 -5.0039E-01 1.5587E+00 -5.1822E+00 1.0677E+01 -1.3102E+01 8.8573E+00 -2.5441E+00 0.0000E+00 S6 -3.9795E-01 8.0705E-01 -1.9859E+00 3.1733E+00 -3.2457E+00 1.9125E+00 -4.8661E-01 0.0000E+00 S7 -7.5517E-02 1.6699E-01 -4.5817E-01 7.7435E-01 -9.2617E-01 7.3331E-01 -3.0154E-01 4.3768E-02 S8 2.0614E-02 -9.6699E-03 -2.4724E-02 7.0851E-02 -7.3157E-02 3.8717E-02 -1.0151E-02 1.0397E-03 S9 -2.8636E-01 1.2733E-01 -2.6068E-02 -2.2392E-02 2.4754E-02 -1.0986E-02 2.3495E-03 -1.8971E-04 S10 -2.0772E-01 1.5462E-01 -8.0438E-02 2.8066E-02 -6.4181E-03 9.1570E-04 -7.3973E-05 2.5892E-06

[0149] Table 12

[0150] 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 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 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. 12C It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0151] Example 7

[0152] The following will refer to Figures 13 to 14CAn 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.

[0153] like Fig.13 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0154] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0155] Table 13 shows a basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0156]

[0157] Table 13

[0158] In Example 7, the total effective focal length f of the optical imaging system is 3.79 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 5.18 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 3.30 mm, the value of half the maximum field of view angle Semi-FOV is 43.91°, and the value of the aperture number Fno of the optical imaging system is 2.23.

[0159] Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0160]

[0161]

[0162] Table 14

[0163] 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 lens. Fig. 14B An astigmatism curve of the optical imaging system of Example 7 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig. 14C 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 lens. FIG. 14A to FIG. 14C It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0164] Example 8

[0165] The following will refer to Figures 15 to 16C 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.

[0166] like Fig.15 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0167] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0168] Table 15 shows a basic parameter table of the optical imaging system of Example 8, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0169]

[0170]

[0171] Table 15

[0172] In Example 8, the total effective focal length f of the optical imaging system is 3.08 mm, the value of the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S13 is 4.36 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.55 mm, the value of half the maximum field of view angle Semi-FOV is 44.00°, and the value of the aperture number Fno of the optical imaging system is 2.18.

[0173] Table 16 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0174] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 8.9805E-02 -2.3551E-02 -5.3887E-02 3.6749E-01 -9.7066E-01 1.3676E+00 -7.4749E-01 0.0000E+00 S2 5.6768E-02 -1.4042E-01 4.4709E-01 -1.9155E+00 5.1668E+00 -7.3204E+00 4.6340E+00 0.0000E+00 S3 -1.0054E-01 -2.3746E-01 5.9194E-01 -2.8050E+00 7.4003E+00 -1.0334E+01 6.4763E+00 0.0000E+00 S4 -3.0977E-01 9.1540E-01 -4.6109E+00 1.2488E+01 -1.8694E+01 1.4922E+01 -4.9758E+00 0.0000E+00 S5 -4.7657E-01 1.4685E+00 -5.7108E+00 1.3849E+01 -1.9271E+01 1.4427E+01 -4.5604E+00 0.0000E+00 S6 -4.3233E-01 9.8713E-01 -2.6801E+00 4.8050E+00 -5.3781E+00 3.3995E+00 -9.2006E-01 0.0000E+00 S7 -2.0202E-02 -6.3896E-02 2.2454E-01 -8.9483E-01 1.8036E+00 -2.0327E+00 1.2693E+00 -3.3428E-01 S8 1.7875E-02 -6.1802E-02 1.5033E-01 -2.3544E-01 2.2153E-01 -1.2568E-01 3.9721E-02 -5.2250E-03 S9 -3.5506E-01 1.3818E-01 7.7165E-02 -2.2027E-01 1.9881E-01 -9.2742E-02 2.2315E-02 -2.1730E-03 S10 -2.4935E-01 2.0779E-01 -1.1730E-01 4.3975E-02 -1.0771E-02 1.6503E-03 -1.4544E-04 5.7164E-06

[0175] Table 16

[0176] 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 lens. 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 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 lens. FIG. 16A to FIG. 16C It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0177] Example 9

[0178] The following will refer to Figures 17 to 18C An optical imaging system according to Example 9 of the present application is described. Fig.17 A schematic structural diagram of an optical imaging system according to Example 9 of the present application is shown.

[0179] like Fig.17 As shown, the optical imaging system includes, in order 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 and a filter E6.

[0180] 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 positive focal power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The optical imaging system has an imaging surface S13, and the light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0181] Table 17 shows a basic parameter table of the optical imaging system of Example 9, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0182]

[0183]

[0184] In an embodiment, the total effective focal length f of the optical imaging system is 3.04 mm, the value of the on-axis distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.31 mm, the value of half the diagonal length of the effective pixel area on the imaging surface S13 ImgH is 2.55 mm, the value of half the maximum field of view Semi-FOV is 46.01°, and the value of the aperture number Fno of the optical imaging system is 2.20.

[0185] Table 18 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 9, wherein each aspherical surface shape can be defined by formula (1) given in the above Example 1.

[0186] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 9.2539E-02 -3.1573E-02 -1.4713E-01 8.4528E-01 -2.2987E+00 3.2986E+00 -1.9004E+00 0.0000E+00 S2 7.8452E-02 -1.9695E-01 5.1036E-01 -2.0535E+00 5.2277E+00 -6.9983E+00 4.3359E+00 0.0000E+00 S3 -8.9195E-02 -2.5108E-01 5.1754E-01 -2.4802E+00 6.1657E+00 -8.2330E+00 5.4194E+00 0.0000E+00 S4 -3.0772E-01 8.8293E-01 -4.3321E+00 1.0883E+01 -1.4792E+01 1.0688E+01 -3.2414E+00 0.0000E+00 S5 -4.7906E-01 1.4504E+00 -5.3660E+00 1.1975E+01 -1.4902E+01 9.7890E+00 -2.7141E+00 0.0000E+00 S6 -4.3335E-01 9.8449E-01 -2.5308E+00 4.2188E+00 -4.3669E+00 2.5592E+00 -6.4824E-01 0.0000E+00 S7 -1.6821E-02 -6.8974E-02 1.8806E-01 -6.3518E-01 1.0946E+00 -1.0834E+00 6.3549E-01 -1.6523E-01 S8 1.8759E-02 -6.5406E-02 1.5159E-01 -2.3951E-01 2.3404E-01 -1.4192E-01 4.8825E-02 -7.0576E-03 S9 -3.5536E-01 1.4674E-01 2.9260E-02 -1.3861E-01 1.2921E-01 -5.9957E-02 1.4230E-02 -1.3660E-03 S10 -2.4197E-01 1.9895E-01 -1.1238E-01 4.2598E-02 -1.0644E-02 1.6720E-03 -1.5169E-04 6.1566E-06

[0187] Table 18

[0188] Fig.18A The axial chromatic aberration curve of the optical imaging system of Example 9 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Fig.18B An astigmatism curve of the optical imaging system of Example 9 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig.18C The magnification chromatic aberration curve of the optical imaging system of Example 9 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 18A to 18C It can be seen that the optical imaging system provided in Example 9 can achieve good imaging quality.

[0189] In combination with the above, Examples 1 to 9 satisfy the relationship shown in Table 19 below.

[0190]

[0191]

[0192] Table 19

[0193] 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.

[0194] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging system, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The second lens has positive power, and its object-side surface is convex and its image-side surface is convex; The third lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; and A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; The number of lenses having optical power in the optical imaging system is five; The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 0.9 <f1 / f2<2.2; The curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens and the total effective focal length f of the optical imaging system satisfy: 1.9<(R6+R7) / f≤3.

70.

2. The optical imaging system according to claim 1, characterized in that: The combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f2 of the second lens satisfy: 1.06≤f123 / f2≤3.

24.

3. The optical imaging system according to claim 1, characterized in that: The effective focal length f2 of the second lens and the combined focal length f234 of the second lens, the third lens and the fourth lens satisfy: 1.67≤f2 / f234≤2.

43.

4. The optical imaging system according to claim 1, characterized in that: The curvature radius R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: 1.26≤R7 / f4<4.

0.

5. The optical imaging system according to claim 1, characterized in that: The curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: 2.76≤(R6+R7) / |R8|≤5.

28.

6. 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 f4 of the fourth lens satisfy: 2.5 <f1 / f4≤4.19。 7. The optical imaging system according to claim 1, characterized in that: The effective focal length f3 of the third lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.6 <f3 / R8≤3.33。 8. The optical imaging system according to claim 1, characterized in that: The sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis ΣAT and the distance T34 between the third lens and the fourth lens on the optical axis satisfy: 6.58≤ΣAT / T34≤9.

79.

9. The optical imaging system according to claim 1, characterized in that: The interval T12 between the first lens and the second lens on the optical axis, the interval T23 between the second lens and the third lens on the optical axis, the interval T34 between the third lens and the fourth lens on the optical axis, and the interval T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.16≤T45 / (T12+T23+T34)≤2.

15.

10. The optical imaging system according to claim 1, characterized in that: An axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, an axial distance SAG21 between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, and a center thickness CT1 of the first lens on the optical axis satisfy: 0.6<(SAG11+SAG12) / CT1<1.

2.

11. The optical imaging system according to any one of claims 1 to 10, characterized in that: The distance InTL from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis and 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 satisfy: 0.50<InTL / TTL≤0.60.

Images