Optical imaging system

Abstract

The present application discloses an optical imaging system comprising, in order from the object side to the image side along the optical axis, a first lens having negative optical power; a second lens having positive optical power, the object-side surface and the image-side surface of the lens being convex; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power; and a sixth lens having optical power. The total effective focal length f of the optical imaging system, half of the maximum field of view (Semi-FOV) of the optical imaging system, and the combined focal length f234 of the second, third, and fourth lenses satisfy the following conditions: 3.20 mm < f × tan(Semi-FOV) < 5.65 mm; and 0.5 < f234 / f < 3.0.

Description

Technical Field

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

[0002] In recent years, with the rapid adoption of consumer electronics like mobile phones, tablets, and VR, demand for lens quality has grown increasingly stringent. For smart device developers, in order to enhance their product's competitiveness, in addition to electronic components like the CPU, screen, and memory, they must also consider one or more high-quality lenses with wide field of view, compact size, and high definition. High-quality imaging results provide users with an excellent visual experience.

[0003] Properly coordinating lens parameters means better imaging results. For the field of optical system design, how to properly coordinate lens parameters will be a considerable challenge. Summary of the Invention

[0004] On the one hand, the present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with positive optical power, whose object-side surface is convex and whose image-side surface is convex; a third lens with negative optical power; a fourth lens with optical power; a fifth lens with optical power; and a sixth lens with optical power.

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

[0006] In one embodiment, the total effective focal length f of the optical imaging system and half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 3.20 mm < f×tan(Semi-FOV) < 5.65 mm.

[0007] In one embodiment, the total effective focal length f of the optical imaging system and the combined focal length f234 of the second lens, the third lens, and the fourth lens may satisfy: 0.5<f234 / f<3.0.

[0008] In one embodiment, the maximum field of view (FOV) of the optical imaging system may satisfy: FOV>120°.

[0009] In one embodiment, 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, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH, and the total effective focal length f of the optical imaging system may satisfy the following: 4.0 mm < TTL / ImgH × f < 7.6 mm.

[0010] In one embodiment, the curvature radius R5 of the object-side surface of the third lens, the curvature radius R6 of the image-side surface of the third lens, and the total effective focal length f of the optical imaging system may satisfy: 2<|(R5+R6)| / f<11.2.

[0011] In one embodiment, the effective focal length f4 of the fourth lens and half of the maximum field of view (Semi-FOV) of the optical imaging system may satisfy the following relationship: 5.10 mm < |f4| × tan(Semi-FOV) < 21.00 mm.

[0012] In one embodiment, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis may satisfy: 1.0<CT4 / CT3<5.0.

[0013] In one embodiment, the distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens on the optical axis and the distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens on the optical axis may satisfy: 1.0<SAG12 / SAG11<2.5.

[0014] In one embodiment, the maximum value ET of the edge thickness of the first lens to the sixth lens is MAX Can meet: ET MAX <1.75mm.

[0015] In one embodiment, a center thickness CT5 of the fifth lens on the optical axis and a spacing distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: 0.5<CT5 / T56<4.5.

[0016] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: 3<|f1 / f2+f3 / f2|<5.

[0017] In one embodiment, a curvature radius R12 of the image-side surface of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis may satisfy: 0.80<R12 / CT6<3.4.

[0018] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a sum ΣCT of center thicknesses of the first to sixth lenses on the optical axis may satisfy: 3.0<ΣCT / CT4<7.0.

[0019] In one embodiment, the refractive index N3 of the third lens element and the refractive index N6 of the sixth lens element may both be greater than 1.60.

[0020] In one embodiment, the Abbe number V4 of the fourth lens may be greater than 45, and the Abbe number V6 of the sixth lens may be less than 25.0.

[0021] In one embodiment, the optical imaging system may further include an aperture stop, and the aperture stop may be located between the first lens and the second lens.

[0022] The present application provides an optical imaging system that is applicable to portable electronic products, has miniaturization and good imaging quality, by reasonably allocating optical focal length and optimizing optical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 1 shows a schematic structural diagram of an optical imaging system according to Example 1 of the present application;

[0025] Figures 2A to 2C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

[0026] Figure 3 1 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application;

[0027] Figures 4A to 4C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

[0028] Figure 5 1 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application;

[0029] Figures 6A to 6C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 3 are respectively shown;

[0030] Figure 7 Schematic diagram of the structure of an optical imaging system according to Example 4 of the present application is shown;

[0031] Figures 8A to 8C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 4 are respectively shown;

[0032] Figure 9 1 shows a schematic structural diagram of an optical imaging system according to Example 5 of the present application;

[0033] 10A to 10C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0034] Figure 11 1 shows a schematic structural diagram of an optical imaging system according to Example 6 of the present application;

[0035] 12A to 12C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown;

[0036] Figure 13 1 shows a schematic structural diagram of an optical imaging system according to Example 7 of the present application;

[0037] 14A to 14C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 7 are shown respectively;

[0038] Figure 15 1 shows a schematic structural diagram of an optical imaging system according to Example 8 of the present application;

[0039] 16A to 16C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 8 are shown respectively;

[0040] Figure 17 shows a schematic structural diagram of an optical imaging system according to Example 9 of the present application; and

[0041] 18A to 18C The axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging system of Example 9 are respectively shown. DETAILED DESCRIPTION

[0042] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely 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.

[0043] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0044] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0046] 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 preclude 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 list of 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.

[0047] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0049] The features, principles and other aspects of the present application are described in detail below.

[0050] An optical imaging system according to an exemplary embodiment of the present application may include six lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first through sixth lenses may be spaced apart by a distance.

[0051] In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive optical power, and its object-side surface may be convex and its image-side surface may be convex; the third lens may have negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have positive optical power or negative optical power; and the sixth lens may have positive optical power or negative optical power.

[0052] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following conditions: 3.20mm < f × tan(Semi-FOV) < 5.65mm, where f is the total effective focal length of the optical imaging system and Semi-FOV is half of the maximum field of view of the optical imaging system. Meeting this condition helps balance aberrations, meeting the requirements of both ultra-wide angle and high image quality, while also ensuring a small lens size, meeting the requirements of lens miniaturization.

[0053] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following relationship: 0.5 < f234 / f < 3.0, where f is the total effective focal length of the optical imaging system and f234 is the combined focal length of the second, third, and fourth lenses. More specifically, f234 and f can further satisfy the following relationship: 0.7 < f234 / f < 2.7. This relationship helps balance aberrations, meeting the requirements of both ultra-wide angle and high image quality, while also ensuring a small lens size, meeting the requirements of lens miniaturization.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: FOV>120°, where FOV is the maximum field of view of the optical imaging system. Satisfying FOV>120° is conducive to obtaining more visual information.

[0055] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following conditions: 4.0 mm < TTL / ImgH × f < 7.6 mm, where TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane of the optical imaging system, ImgH is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, and f is the total effective focal length of the optical imaging system. Meeting this condition facilitates controlling the overall size of the lens and the image plane, meeting miniaturization requirements.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 2 < |(R5 + R6)| / f < 11.2, where R5 is the radius of curvature of the object-side surface of the third lens element, R6 is the radius of curvature of the image-side surface of the third lens element, and f is the total effective focal length of the optical imaging system. More specifically, R5, R6, and f may further satisfy the following: 2.3 < |(R5 + R6)| / f < 11.2. Satisfying 2 < |(R5 + R6)| / f < 11.2 facilitates better correction of spherical aberration and, by taking into account processing issues, can effectively reduce the sensitivity of ultra-wide-angle lens processing and assembly.

[0057] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following conditions: 5.10 mm < |f4| × tan(Semi-FOV) < 21.00 mm, where f4 is the effective focal length of the fourth lens element and the Semi-FOV is half the maximum field of view of the optical imaging system. Satisfying 5.10 mm < |f4| × tan(Semi-FOV) < 21.00 mm facilitates distortion correction.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following relationship: 1.0 < CT4 / CT3 < 5.0, where CT3 is the center thickness of the third lens element along the optical axis, and CT4 is the center thickness of the fourth lens element along the optical axis. More specifically, CT4 and CT3 may further satisfy the following relationship: 1.2 < CT4 / CT3 < 4.6. This relationship of 1.0 < CT4 / CT3 < 5.0 facilitates lens manufacturing processability and helps balance aberrations.

[0059] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following: 1.0<SAG12 / SAG11<2.5, wherein SAG11 is the distance from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens on the optical axis, and SAG12 is the distance from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens on the optical axis. More specifically, SAG12 and SAG11 may further satisfy the following: 1.2<SAG12 / SAG11<2.4. Satisfying 1.0<SAG12 / SAG11<2.5 is conducive to improving the manufacturability of the system, taking into account both the manufacturability of the system and the overall imaging quality. If the ratio is too large, the manufacturability will be poor, and if it is too small, it will be unfavorable for correcting the field curvature of the off-axis field of view.

[0060] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: ET MAX <1.75mm, among which ET MAX Is the maximum value of the edge thickness of the first to sixth lenses. MAX <1.75mm, which is conducive to meeting the processing requirements and the miniaturization requirements of the optical system.

[0061] In an exemplary embodiment, the optical imaging system according to the present application can satisfy the following relationship: 0.5 < CT5 / T56 < 4.5, where CT5 is the center thickness of the fifth lens element on the optical axis, and T56 is the distance between the fifth and sixth lenses on the optical axis. This relationship facilitates aberration correction and reduces sensitivity during ultra-wide-angle lens assembly.

[0062] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following relationship: 3 < |f1 / f2+f3 / f2| < 5, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. More specifically, f1, f2, and f3 may further satisfy the following relationship: 3 < |f1 / f2+f3 / f2| < 4.7. This relationship facilitates the proper allocation of the optical power of each lens in the system, effectively sharing the burden of correcting spherical aberration, aberration, chromatic aberration of magnification, and axial chromatic aberration, thereby improving system performance.

[0063] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following conditions: 0.80 < R12 / CT6 < 3.4, where R12 is the radius of curvature of the image-side surface of the sixth lens element, and CT6 is the central thickness of the sixth lens element along the optical axis. More specifically, R12 and CT6 may further satisfy the following conditions: 1.30 < R12 / CT6 < 3.4. This condition reduces lens processing sensitivity while ensuring manufacturing requirements and facilitates distortion correction.

[0064] In an exemplary embodiment, the optical imaging system according to the present application may satisfy the following relationship: 3.0 < ΣCT / CT4 < 7.0, where CT4 is the center thickness of the fourth lens element along the optical axis, and ΣCT is the sum of the center thicknesses of the first through sixth lenses along the optical axis. More specifically, ΣCT and CT4 may further satisfy the following relationship: 3.3 < ΣCT / CT4 < 6.8. This relationship, 3.0 < ΣCT / CT4 < 7.0, helps meet system miniaturization requirements.

[0065] In an exemplary embodiment, the refractive index N3 of the third lens element and the refractive index N6 of the sixth lens element can both be greater than 1.60. This helps to properly distribute the system's optical power and eliminate or reduce the effects of optical system aberrations.

[0066] In an exemplary embodiment, the Abbe number V4 of the fourth lens element may be greater than 45, and the Abbe number V6 of the sixth lens element may be less than 25.0. More specifically, V4 may be greater than 55. The Abbe number V4 of the fourth lens element greater than 45 and the Abbe number V6 of the sixth lens element less than 25.0 help to reasonably eliminate or reduce the effects of chromatic aberration.

[0067] In an exemplary embodiment, the optical imaging system according to the present application further includes an aperture arranged between the first lens and the second lens. Providing the aperture between the first lens and the second lens helps to reasonably eliminate the spherical aberration and coma of the optical system, thereby obtaining a high-performance optical system. Optionally, the above-mentioned optical imaging system may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging system with characteristics such as low chromatic aberration, miniaturization and good imaging quality. The optical imaging system according to the above-mentioned embodiment of the present application may adopt multiple lenses, such as the six lenses described above. By reasonably allocating the optical power, surface shape, center thickness of each lens and the on-axis spacing between each lens, the incident light can be effectively converged, the total optical length of the imaging lens can be reduced and the machinability of the imaging lens can be improved, making the optical imaging system more conducive to production and processing.

[0068] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The characteristic of an 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 that occurs 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 and the sixth 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 and the sixth lens are all aspherical mirror surfaces.

[0069] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses comprising the optical imaging system can be varied to achieve the various results and advantages described herein. For example, while six lenses are described in the embodiments, the optical imaging system is not limited to six lenses. If desired, the optical imaging system may also include other numbers of lenses.

[0070] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0071] Example 1

[0072] The following reference Figures 1 to 2C An optical imaging system according to Example 1 of the present application is described. Figure 1A structural schematic diagram of an optical imaging system according to Example 1 of the present application is shown.

[0073] like Figure 1 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0074] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0075] Table 1 shows the basic parameters of the optical imaging system of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0076]

[0077] Table 1

[0078] In this example, the total effective focal length f of the optical imaging system is 2.57 mm, the total length TTL of the optical imaging system (i.e., the distance from the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system on the optical axis) is 5.50 mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.34 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.51°, and the aperture value Fno of the optical imaging system is 2.23.

[0079] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0080]

[0081] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface 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 conic 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, 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 and A 16 .

[0082] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.2010E-01 -2.8981E-01 2.3847E-01 -1.4669E-01 8.3207E-02 -3.4468E-02 6.5047E-03 S2 -1.6295E-01 5.7984E-02 -1.4304E+00 4.1826E+00 -7.8253E+00 8.1167E+00 -3.7290E+00 S3 -1.1893E-02 1.6350E-01 -1.5228E+00 6.2673E+00 -1.4689E+01 1.8084E+01 -9.1981E+00 S4 -2.5504E-01 2.2099E-01 1.0721E+00 -5.7696E+00 1.2965E+01 -1.4506E+01 6.4805E+00 S5 -3.5052E-01 1.0450E-03 2.5172E+00 -9.6681E+00 1.8651E+01 -1.9055E+01 8.0779E+00 S6 -1.7281E-01 -4.9251E-01 3.0707E+00 -7.5934E+00 1.0679E+01 -8.1324E+00 2.6080E+00 S7 3.4255E-02 -5.4162E-01 1.9291E+00 -3.7670E+00 4.4084E+00 -2.7669E+00 6.9253E-01 S8 -2.2101E-01 2.3834E-01 -4.4323E-01 6.6002E-01 -6.0181E-01 3.2797E-01 -7.5730E-02 S9 -7.3398E-03 -5.7708E-02 3.1800E-02 -1.0138E-01 1.1454E-01 -4.6785E-02 6.4654E-03 S10 -1.3901E-01 2.0651E-01 -2.5845E-01 1.6349E-01 -6.6458E-02 1.8095E-02 -2.3852E-03 S11 -3.5116E-01 -9.1539E-02 4.0496E-01 -3.7902E-01 1.7992E-01 -4.3142E-02 4.1211E-03 S12 -3.8491E-01 2.9718E-01 -1.6333E-01 5.9728E-02 -1.3534E-02 1.7015E-03 -8.9410E-05

[0083] Table 2

[0084] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates the deviation of the focal point 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. Figures 2A to 2C It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following reference Figures 3 to 4C The optical imaging system according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to Example 1 will be omitted for the sake of brevity. Figure 3 A structural schematic diagram of an optical imaging system according to Example 2 of the present application is shown.

[0087] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0088] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0089] In this example, the total effective focal length f of the optical imaging system is 2.08 mm, the total length TTL of the optical imaging system is 5.00 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.34 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.04°, and the aperture value Fno of the optical imaging system is 2.20.

[0090] Table 3 shows the basic parameters of the optical imaging system of Example 2, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 2, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0091]

[0092] Table 3

[0093]

[0094]

[0095] Table 4

[0096] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4B The 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. Figures 4A to 4C It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0097] Example 3

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

[0099] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

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

[0101] In this example, the total effective focal length f of the optical imaging system is 2.35 mm, the total length TTL of the optical imaging system is 5.51 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.26°, and the aperture value Fno of the optical imaging system is 2.23.

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

[0103]

[0104]

[0105] Table 5

[0106] Face number A4 A6 A8 A10 A12 A14 A16 S1 7.6595E-02 -2.0489E-01 2.3298E-01 -1.9373E-01 1.1082E-01 -3.7226E-02 5.4056E-03 S2 -2.1586E-01 -2.0051E-02 -6.2918E-01 2.4377E+00 -5.6041E+00 6.4212E+00 -3.0921E+00 S3 -6.8517E-02 5.5615E-02 -1.0193E+00 4.3422E+00 -1.1426E+01 1.5559E+01 -8.9591E+00 S4 -1.4253E-01 2.5056E-01 -3.4586E-01 5.2730E-01 8.4154E-01 -2.8555E+00 2.4929E+00 S5 -3.4483E-01 4.8601E-01 -1.7201E+00 5.1012E+00 -8.3195E+00 7.4066E+00 -2.7807E+00 S6 -3.3667E-01 6.7612E-01 -1.9343E+00 4.1925E+00 -5.2518E+00 3.6921E+00 -1.1580E+00 S7 -3.0449E-02 1.4258E-01 -5.4556E-01 1.0224E+00 -9.9030E-01 5.4937E-01 -1.4521E-01 S8 -1.9244E-01 9.6340E-02 -3.8540E-02 3.4292E-02 -5.1744E-02 5.2178E-02 -1.4525E-02 S9 8.2992E-02 -3.9115E-01 5.8373E-01 -6.2156E-01 4.0230E-01 -1.3402E-01 1.7685E-02 S10 -2.2918E-02 -1.4702E-01 2.3096E-01 -2.3308E-01 1.3086E-01 -3.6853E-02 4.0695E-03 S11 -3.7033E-01 -6.7300E-02 3.5937E-01 -3.3634E-01 1.5442E-01 -3.4837E-02 3.0702E-03 S12 -3.5522E-01 2.7691E-01 -1.4169E-01 4.7264E-02 -9.8914E-03 1.1653E-03 -5.8184E-05

[0107] Table 6

[0108] Figure 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates the deviation of the focal point 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. Figures 6A to 6C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0109] Example 4

[0110] The following reference Figures 7 to 8C An optical imaging system according to Example 4 of the present application is described. Figure 7 A structural schematic diagram of an optical imaging system according to Example 4 of the present application is shown.

[0111] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0112] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0113] In this example, the total effective focal length f of the optical imaging system is 2.20 mm, the total length TTL of the optical imaging system is 5.80 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.10°, and the aperture value Fno of the optical imaging system is 2.24.

[0114] Table 7 shows the basic parameters of the optical imaging system of Example 4, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 4, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0115]

[0116] Table 7

[0117]

[0118]

[0119] Table 8

[0120] Figure 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates the deviation of the focal point 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. Figures 8A to 8C It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0121] Example 5

[0122] The following reference Figures 9 to 10C An optical imaging system according to Example 5 of the present application is described. Figure 9 A structural schematic diagram of an optical imaging system according to Example 5 of the present application is shown.

[0123] like Figure 9 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0124] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0125] In this example, the total effective focal length f of the optical imaging system is 2.36 mm, the total length TTL of the optical imaging system is 5.80 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.19°, and the aperture value Fno of the optical imaging system is 2.23.

[0126] Table 9 shows the basic parameters of the optical imaging system of Example 5, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 5, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0127]

[0128]

[0129] Table 9

[0130] Face number A4 A6 A8 A10 A12 A14 A16 S1 7.0778E-03 -6.6865E-02 7.0306E-02 -3.7599E-02 1.2160E-02 -2.2468E-03 1.8244E-04 S2 -2.0150E-01 6.8223E-02 -3.7789E-01 9.3528E-01 -1.3852E+00 1.0866E+00 -3.7145E-01 S3 1.5997E-02 1.1525E-01 -5.1181E-01 2.1003E+00 -4.0602E+00 4.0683E+00 -1.2750E+00 S4 -1.9586E-01 1.4427E-01 9.3572E-02 -6.5423E-01 3.7935E+00 -8.2760E+00 7.1857E+00 S5 -1.6273E-01 -2.3687E-01 2.8942E-01 2.6652E+00 -7.9137E+00 8.3653E+00 -2.4225E+00 S6 -8.5827E-02 -4.7798E-01 1.2751E+00 -9.5959E-01 -3.4697E-01 8.2488E-01 -2.9804E-01 S7 -5.5445E-02 -1.4063E-01 1.6602E-01 3.1014E-01 -5.2721E-01 3.0305E-01 -6.8550E-02 S8 -1.9352E-01 2.8879E-01 -6.5260E-01 1.0760E+00 -1.0294E+00 6.2127E-01 -1.6372E-01 S9 -5.5655E-02 1.1040E-01 -2.2154E-01 1.9091E-01 -7.4694E-02 1.2388E-02 -5.7751E-04 S10 -1.4920E-01 2.2789E-01 -2.7725E-01 1.5602E-01 -2.7959E-02 -7.6671E-03 2.7293E-03 S11 -7.1063E-01 2.8586E-01 2.2705E-01 -5.5090E-01 4.5841E-01 -1.8383E-01 2.9399E-02 S12 -3.5474E-01 3.2229E-01 -2.1543E-01 9.3926E-02 -2.5099E-02 3.7498E-03 -2.3878E-04

[0131] Table 10

[0132] Figure 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 10B An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 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. 10A to 10C It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0133] Example 6

[0134] The following reference Figures 11 to 12C An optical imaging system according to Example 6 of the present application is described. Figure 11 A structural schematic diagram of an optical imaging system according to Example 6 of the present application is shown.

[0135] like Figure 11 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0136] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0137] In this example, the total effective focal length f of the optical imaging system is 2.26 mm, the total length TTL of the optical imaging system is 5.33 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 62.94°, and the aperture value Fno of the optical imaging system is 2.23.

[0138] Table 11 shows the basic parameters of the optical imaging system of Example 6, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 6, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0139]

[0140] Table 11

[0141]

[0142]

[0143] Table 12

[0144] Figure 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 12B An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 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. 12A to 12C It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0145] Example 7

[0146] The following reference Figures 13 to 14C An optical imaging system according to Example 7 of the present application is described. Figure 13 A structural schematic diagram of an optical imaging system according to Example 7 of the present application is shown.

[0147] like Figure 13 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0148] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0149] In this example, the total effective focal length f of the optical imaging system is 2.05 mm, the total length TTL of the optical imaging system is 5.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.18°, and the aperture value Fno of the optical imaging system is 2.24.

[0150] Table 13 shows the basic parameters of the optical imaging system of Example 7, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 7, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0151]

[0152]

[0153] Table 13

[0154] Face number A4 A6 A8 A10 A12 A14 A16 S1 9.0364E-02 -2.5913E-01 3.0434E-01 -1.9878E-01 7.4060E-02 -1.4184E-02 9.2966E-04 S2 -1.5640E-01 -4.1951E-01 7.8526E-01 -9.7519E-01 1.0283E+00 -1.0619E+00 4.7048E-01 S3 -6.9156E-02 6.8853E-01 -7.1195E+00 3.8996E+01 -1.1425E+02 1.7244E+02 -1.0463E+02 S4 -3.2434E-01 1.1274E+00 -6.9050E+00 3.1383E+01 -7.9419E+01 1.0581E+02 -5.6813E+01 S5 -4.6262E-01 1.3320E+00 -7.2864E+00 2.4948E+01 -4.6208E+01 4.4052E+01 -1.7136E+01 S6 -2.5760E-01 1.9030E+00 -8.7028E+00 2.0957E+01 -2.7472E+01 1.8781E+01 -5.2755E+00 S7 -2.2076E-01 1.6678E+00 -6.2558E+00 1.1990E+01 -1.2632E+01 7.2339E+00 -1.8062E+00 S8 -3.9427E-01 1.1485E+00 -3.4702E+00 7.1791E+00 -8.9750E+00 6.0521E+00 -1.6508E+00 S9 -1.3534E-01 5.0789E-01 -1.0939E+00 1.3062E+00 -9.2632E-01 3.5323E-01 -5.5479E-02 S10 -2.4835E-01 4.6975E-01 -5.6954E-01 3.6405E-01 -1.1640E-01 1.5547E-02 -6.6307E-04 S11 -2.0664E-01 -9.4960E-01 1.7958E+00 -1.5950E+00 8.3655E-01 -2.4329E-01 2.9381E-02 S12 -4.1351E-01 3.0538E-01 -1.6173E-01 6.4469E-02 -1.6624E-02 2.3355E-03 -1.3463E-04

[0155] Table 14

[0156] Figure 14A The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the lens. Figure 14B An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 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. 14A to 14C It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0157] Example 8

[0158] The following reference Figures 15 to 16C An optical imaging system according to Example 8 of the present application is described. Figure 15 A structural schematic diagram of an optical imaging system according to Example 8 of the present application is shown.

[0159] like Figure 15 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0160] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0161] In this example, the total effective focal length f of the optical imaging system is 1.84 mm, the total length TTL of the optical imaging system is 5.29 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.36 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.14°, and the aperture value Fno of the optical imaging system is 2.24.

[0162] Table 15 shows the basic parameters of the optical imaging system of Example 8, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 16 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 8, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0163]

[0164] Table 15

[0165]

[0166]

[0167] Table 16

[0168] Figure 16A The axial chromatic aberration curve of the optical imaging system of Example 8 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 16B An astigmatism curve of the optical imaging system of Example 8 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 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. 16A to 16C It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0169] Example 9

[0170] The following reference Figures 17 to 18C An optical imaging system according to Example 9 of the present application is described. Figure 17 A structural schematic diagram of an optical imaging system according to Example 9 of the present application is shown.

[0171] like Figure 17 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0172] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0173] In this example, the total effective focal length f of the optical imaging system is 3.22 mm, the total length TTL of the optical imaging system is 5.80 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging system is 2.47 mm, half of the maximum field of view Semi-FOV of the optical imaging system is 60.13°, and the aperture value Fno of the optical imaging system is 2.79.

[0174] Table 17 shows the basic parameters of the optical imaging system of Example 9, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Table 18 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 9, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0175]

[0176]

[0177] Table 17

[0178] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.5219E-02 -1.5595E-01 -3.9708E-02 1.8855E-01 -1.4070E-01 4.8375E-02 -6.7980E-03 S2 -1.7525E-01 -9.6626E-02 -5.4803E-01 1.3723E+00 -1.3709E+00 7.0458E-01 -1.2697E-01 S3 -4.7833E-02 2.9044E-01 -4.3239E+00 2.2944E+01 -7.0786E+01 1.1580E+02 -7.9449E+01 S4 -4.4915E-01 4.9682E-01 3.6237E+00 -4.3174E+01 1.6305E+02 -2.7459E+02 1.7509E+02 S5 -4.4673E-01 9.5788E-01 2.8414E-01 -2.1698E+01 8.9484E+01 -1.4925E+02 9.1702E+01 S6 -3.1007E-01 5.0977E-01 1.5966E-01 -5.8958E+00 1.8001E+01 -2.2439E+01 1.0354E+01 S7 -6.2449E-02 -2.1049E-01 1.6720E+00 -6.3875E+00 1.2193E+01 -1.0765E+01 3.6016E+00 S8 1.7330E-02 -6.4444E-01 1.1991E+00 -1.6841E+00 1.7332E+00 -1.1209E+00 3.5305E-01 S9 1.4149E-01 -5.9858E-01 8.4114E-01 -8.5802E-01 4.8974E-01 -1.2758E-01 8.7541E-03 S10 -2.3126E-01 6.1699E-01 -1.0458E+00 9.9901E-01 -6.2900E-01 2.2800E-01 -3.4648E-02 S11 -4.8396E-01 5.2695E-01 -5.9953E-01 5.1838E-01 -3.4885E-01 1.4041E-01 -2.2379E-02 S12 -9.2801E-02 5.3827E-02 -2.5345E-02 7.5648E-03 -1.3006E-03 1.0868E-04 -2.6074E-06

[0179] Table 18

[0180] Figure 18A The axial chromatic aberration curve of the optical imaging system of Example 9 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 18B An astigmatism curve of the optical imaging system of Example 9 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 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.

[0181] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 19.

[0182]

[0183]

[0184] Table 19

[0185] The present application also provides an imaging device, wherein the electronic photosensitive element thereof can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0186] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical imaging system, characterized in that Along the optical axis from the object side to the image side, they include: a first lens having negative optical power and a concave image-side surface; a second lens having positive refractive power, its object-side surface being convex and its image-side surface being convex; a third lens element having negative optical power and a concave image-side surface; a fourth lens having optical power; a fifth lens having optical power; and a sixth lens having optical power, the object-side surface of which is convex and the image-side surface of which is concave; The number of lenses having optical power in the optical imaging system is six; The total effective focal length f of the optical imaging system, half of the maximum field of view Semi-FOV of the optical imaging system, the combined focal length f234 of the second lens, the third lens, and the fourth lens, the effective focal length f4 of the fourth lens, the center thickness CT5 of the fifth lens on the optical axis, and the separation distance T56 between the fifth lens and the sixth lens on the optical axis satisfy the following conditional equations: 3.20 mm<f×tan(Semi-FOV)<5.65 mm; 0.77≤f234 / f≤2.64; 5.19 mm≤|f4|×tan(Semi-FOV)≤20.50 mm; 0.69≤CT5 / T56≤4.

40.

2. The optical imaging system according to claim 1, wherein: The maximum field of view (FOV) of the optical imaging system satisfies the following conditions: 120°<FOV≤125.88°.

3. The optical imaging system according to claim 1, wherein: 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, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH, and the total effective focal length f of the optical imaging system satisfy the following conditions: 4.14 mm ≤ TTL / ImgH×f<7.6 mm.

4. The optical imaging system according to claim 1, wherein: The curvature radius R5 of the object-side surface of the third lens, the curvature radius R6 of the image-side surface of the third lens, and the total effective focal length f of the optical imaging system satisfy: 2.3<|(R5+R6)| / f≤11.

06.

5. The optical imaging system according to claim 1, wherein: A center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy the following: 1.2<CT4 / CT3<4.

6.

6. The optical imaging system according to claim 1, wherein: The distance SAG11 from 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 on the optical axis and the distance SAG12 from 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 on the optical axis satisfy: 1.2<SAG12 / SAG11≤2.

32.

7. The optical imaging system according to claim 1, wherein: The maximum value ET of the edge thickness of the first lens to the sixth lens MAX Meets: 0.83 mm ≤ ET MAX <1.75 mm.

8. The optical imaging system according to claim 1, wherein: The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy the following: 3.08≤|f1 / f2+f3 / f2|≤4.

63.

9. The optical imaging system according to claim 1, wherein: A curvature radius R12 of the image-side surface of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy the following: 1.40≤R12 / CT6≤3.

33.

10. The optical imaging system according to claim 1, wherein: A center thickness CT4 of the fourth lens on the optical axis and a sum ΣCT of center thicknesses of the first to sixth lenses on the optical axis satisfy the following: 3.37≤ΣCT / CT4≤6.

72.

11. The optical imaging system according to claim 1, wherein: A refractive index N3 of the third lens element and a refractive index N6 of the sixth lens element are both greater than 1.

60.

12. The optical imaging system according to claim 1, wherein: The Abbe number V4 of the fourth lens is greater than 45, and the Abbe number V6 of the sixth lens is less than 25.

0.

13. The optical imaging system according to claim 1, wherein: The optical imaging system further includes an aperture stop located between the first lens and the second lens.

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