Optical imaging system

Abstract

The present application discloses an optical imaging system, which comprises, in order from the object side to the image side along the optical axis: a flat glass, a first lens having positive optical power, a second lens having negative optical power, and a plurality of subsequent lenses having optical powers. The optical imaging system has a maximum field of view (FOV) that satisfies FOV ≥ 40°, and a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens that satisfies -0.5<R3 / R4<0.

Description

Technical Field

[0001] The present application relates to an optical imaging system, and more particularly, to an optical imaging system including four or five lenses. Background Art

[0002] As major mobile phone manufacturers regard shooting capabilities as one of the most important performance indicators of mobile phones, telephoto, wide-angle, macro, large aperture and large image area lenses have become standard features of mobile phone cameras.

[0003] In the field of microscope lenses, due to the need for microscopic photography, the emphasis is often placed on capturing clear details of the subject, while often overlooking the lens's field of view. Therefore, ensuring that details of the subject are captured clearly while also designing a microscope lens with a wide field of view to capture a wider range of view, thereby providing a better user experience, presents a significant challenge in optical design. Summary of the Invention

[0004] The present application provides an optical imaging system that is applicable to portable electronic products and can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art, for example, an optical imaging system that is applicable to a built-in microscopic photography lens.

[0005] 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 plane glass; a first lens with positive optical power; a second lens with negative optical power; and a plurality of subsequent lenses with optical powers.

[0006] In one embodiment, the maximum field of view (FOV) of the optical imaging system may satisfy FOV≥40°.

[0007] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy −0.5< R3 / R4 <0.

[0008] In one embodiment, the distance TL from the object to the imaging plane of the optical imaging system on the optical axis may satisfy TL≤7.0 mm.

[0009] In one embodiment, the maximum image height ImgH of the optical imaging system and the maximum height Do of the object to be photographed may satisfy ImgH / Do≥1.0.

[0010] In one embodiment, the entrance pupil diameter EPD of the optical imaging system and the maximum image height ImgH of the optical imaging system may satisfy 0.5<EPD / ImgH<1.0.

[0011] In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f / EPD<1.2.

[0012] In one embodiment, the total effective focal length f of the optical imaging system and the distance BFL on the optical axis from the image side surface of the lens closest to the imaging surface of the optical imaging system to the imaging surface may satisfy f / BFL≥1.0.

[0013] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens may satisfy -1.0≤R1 / R2≤-0.5.

[0014] In one embodiment, the total effective focal length f of the optical imaging system and the combined focal length f12 of the first lens and the second lens may satisfy 0.3≤f / f12<1.0.

[0015] In one embodiment, the distance To from the object to the object-side surface of the first lens on the optical axis and the entrance pupil diameter EPD of the optical imaging system may satisfy 1.8≤To / EPD<3.0.

[0016] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens and a fourth lens, and the spacing T34 between the third lens and the fourth lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.3≤T34 / CT4<2.0.

[0017] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens and a fourth lens, and the curvature radius R5 of the object-side surface of the third lens and the curvature radius R6 of the image-side surface of the third lens may satisfy 0<R5 / |R6|<1.5.

[0018] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens and a fourth lens, and the effective focal length f2 of the second lens and the curvature radius R5 of the object side surface of the third lens may satisfy -3.0<f2 / R5<0.

[0019] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens, a fourth lens, and a fifth lens, and the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens may satisfy -1.5<f4 / f5≤-1.0.

[0020] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens, a fourth lens, and a fifth lens, and the total effective focal length f of the optical imaging system, 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 may satisfy 1.0<f / R7+f / R8<2.5.

[0021] The present application adopts four or five lenses, and through the reasonable distribution of the optical focal length, surface shape, center thickness of each lens and the on-axis spacing between each lens, the above-mentioned optical imaging system has at least one beneficial effect of microscopic photography, large field of view, large aperture, high imaging quality and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 1 shows a schematic structural diagram of an optical imaging system according to Example 1 of the present application;

[0024] Figures 2A to 2D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

[0025] Figure 3 1 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application;

[0026] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

[0027] Figure 5 1 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application;

[0028] 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 3 are respectively shown;

[0029] Figure 7 Schematic diagram of the structure of an optical imaging system according to Example 4 of the present application is shown;

[0030] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 4 are respectively shown;

[0031] Figure 9 1 shows a schematic structural diagram of an optical imaging system according to Example 5 of the present application;

[0032] 10A to 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0033] Figure 11 1 shows a schematic structural diagram of an optical imaging system according to Example 6 of the present application;

[0034] 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown;

[0035] Figure 13 1 shows a schematic structural diagram of an optical imaging system according to Example 7 of the present application;

[0036] 14A to 14D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 7 are respectively shown;

[0037] Figure 15 1 shows a schematic structural diagram of an optical imaging system according to Example 8 of the present application;

[0038] 16A to 16D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 8 are respectively shown;

[0039] Figure 17 1 shows a schematic structural diagram of an optical imaging system according to Example 9 of the present application;

[0040] 18A to 18D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 9 are respectively shown;

[0041] Figure 19 1 shows a schematic structural diagram of an optical imaging system according to Example 10 of the present application;

[0042] 20A to 20D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 10 are respectively shown;

[0043] Figure 21 1 shows a schematic structural diagram of an optical imaging system according to Example 11 of the present application;

[0044] 22A to 22D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Example 11 are respectively shown;

[0045] Figure 23 1 shows a schematic structural diagram of an optical imaging system according to Example 12 of the present application;

[0046] 24A to 24D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 12 are respectively shown. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[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 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.

[0052] 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.

[0053] 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.

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

[0055] An optical imaging system according to an exemplary embodiment of the present application may include a flat glass element arranged in order from the object side to the image side along an optical axis, as well as a first lens, a second lens, and a plurality of subsequent lenses each having optical power. In an exemplary embodiment, the first lens may have positive optical power, and the second lens may have negative optical power. In an exemplary embodiment, an air gap may be provided between any two adjacent optical elements.

[0056] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula FOV ≥ 40°, where FOV is the maximum field of view of the optical imaging system. More specifically, FOV can further satisfy 40° ≤ FOV ≤ 60°, for example, 40.9° ≤ FOV ≤ 59.0°. Meeting the conditional formula FOV ≥ 40° not only facilitates obtaining a larger field of view of the subject during actual shooting, but also ensures that the imaging position of the subject can be quickly found during shooting, providing consumers with a better user experience.

[0057] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -0.5<R3 / R4<0, wherein R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. More specifically, R3 and R4 may further satisfy -0.45≤R3 / R4≤-0.002. Reasonable control of the radii of curvature of the object side surface and the image side surface of the second lens, in combination with the first lens, can ensure the convergence of more light, thereby obtaining a larger aperture and improving the overall imaging quality; at the same time, having a reasonable radius of curvature can avoid the problem of excessive difficulty in actual processing. Optionally, the object side surface of the second lens may be concave, and the image side surface may be concave.

[0058] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula TL ≤ 7.0 mm, where TL is the distance on the optical axis from the subject to the imaging plane of the optical imaging system. More specifically, TL can further satisfy 6.5 mm ≤ TL ≤ 7.0 mm, for example, 6.68 mm ≤ TL ≤ 6.80 mm. Because the optical imaging system of the present application has a built-in microscope lens, controlling the distance from the subject to the imaging plane to less than 7.0 mm can effectively reduce the overall size of the camera lens assembly, achieving the ultra-thin characteristics and miniaturization of the camera lens assembly, meeting the requirements of today's mobile phones for being thin and light.

[0059] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula ImgH / Do ≥ 1.0, where ImgH is the maximum image height of the optical imaging system and Do is the maximum height of the object being photographed. More specifically, ImgH and Do may further satisfy 1.0 ≤ ImgH / Do ≤ 1.5, for example, 1.03 ≤ ImgH / Do ≤ 1.40. Controlling the ratio of the image height to the object height to be greater than 1 ensures a sufficiently large magnification to ensure that local details of the object are clearly captured, thereby enabling the study of the object's microstructure and achieving the effect of a microscope.

[0060] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<EPD / ImgH<1.0, wherein EPD is the entrance pupil diameter of the optical imaging system, and ImgH is the maximum image height of the optical imaging system. More specifically, EPD and ImgH may further satisfy 0.52≤EPD / ImgH≤0.81. Satisfying the conditional formula 0.5<EPD / ImgH<1.0 can not only ensure that the optical imaging system has a larger image surface, but also ensure sufficient light flux when the front opening is small; at the same time, it avoids the EPD being too small, the acquired light energy being too weak, and the system's optical modulation transfer function (MTF) diffraction limit being too low, thereby avoiding the problem of poor imaging quality.

[0061] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula f / EPD < 1.2, where f is the total effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD may further satisfy 0.5 < f / EPD < 1.2, for example, 0.75 ≤ f / EPD ≤ 1.10. Satisfying the conditional formula f / EPD < 1.2 allows the optical system to have a large aperture, ensuring that sufficient imaging light can enter the optical imaging system even when the shooting environment is dark, so that the image surface has sufficient brightness, achieving good imaging effects even when shooting in dark scenes.

[0062] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula f / BFL≥1.0, wherein f is the total effective focal length of the optical imaging system, and BFL is the distance on the optical axis from the image side surface of the lens closest to the imaging surface of the optical imaging system to the imaging surface. More specifically, f and BFL may further satisfy 1.0≤f / BFL≤1.5, for example, 1.01≤f / BFL≤1.45. Reasonable control of the ratio of the total focal length to the back focal length of the optical imaging system can, on the one hand, have a larger focusing range during the module-side debugging process, and on the other hand, the lens may shoot a target plate in actual use (the subject is placed in the upper and lower glass cover plates), and having a sufficiently long back focal length can ensure that the lens finds the best focus point in this case.

[0063] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -1.0≤R1 / R2≤-0.5, wherein R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens. More specifically, R1 and R2 may further satisfy -0.93≤R1 / R2≤-0.53. Reasonable control of the radius of curvature of the object side surface and the image side surface of the first lens can ensure that the light of the first lens has good convergence ability, slow down the deflection angle of the light, reduce sensitivity, ensure that the lens obtains a larger aperture, and avoid excessive inclination angle of the lens surface due to steep light, which may lead to processability problems in actual processing and molding. Optionally, the object side surface of the first lens may be convex, and the image side surface may be convex.

[0064] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional equation 0.3 ≤ f / f12 < 1.0, where f is the total effective focal length of the optical imaging system and f12 is the combined focal length of the first and second lenses. More specifically, f and f12 can further satisfy 0.33 ≤ f / f12 ≤ 0.74. Properly allocating the combined focal lengths of the first and second lenses can not only reduce the sensitivity of these two lenses and avoid overly stringent tolerance requirements, but also better complementarily eliminate astigmatism, spherical aberration, and other effects introduced by the first and second lenses, thereby improving overall imaging quality and achieving better resolution.

[0065] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.8≤To / EPD<3.0, wherein To is the distance on the optical axis from the object to the object side of the first lens, and EPD is the entrance pupil diameter of the optical imaging system. More specifically, To and EPD may further satisfy 1.82≤To / EPD≤2.73. Satisfying the conditional formula 1.8≤To / EPD<3.0 is conducive to ensuring that both the magnification and the field of view of the entire optical imaging system are within a reasonable range, avoiding the situation where the magnification is too large and the field of view is too small, resulting in an inability to achieve a microscopic shooting effect, or avoiding the situation where the field of view is too small and the magnification is too large, resulting in only a small local range of the object being able to be seen clearly in actual use, resulting in a poor consumer experience.

[0066] In an exemplary embodiment, the multiple subsequent lenses of the optical imaging system of the present application may include a third lens and a fourth lens. In this exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.3≤T34 / CT4<2.0, wherein T34 is the spacing distance between the third lens and the fourth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. More specifically, T34 and CT4 may further satisfy 0.38≤T34 / CT4≤1.61. Satisfying the conditional formula 0.3≤T34 / CT4<2.0 can ensure processing and assembly characteristics, avoid problems such as interference between the front and rear lenses during the assembly process due to too small a gap, or avoid problems such as difficult molding and easy deformation of the lens due to being too thin; at the same time, it is also beneficial to slow down the deflection of light, adjust the field curvature of the lens, reduce sensitivity, and thus obtain better imaging quality.

[0067] In an exemplary embodiment, the multiple subsequent lenses of the optical imaging system of the present application may include a third lens and a fourth lens. In this exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0<R5 / |R6|<1.5, wherein R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. More specifically, R5 and R6 may further satisfy 0.34≤R5 / |R6|≤1.17. Reasonable control of the radius of curvature of the object side surface and the image side surface of the third lens can effectively balance the astigmatism and coma between the third lens and the front lens, so that the lens can maintain better imaging quality; at the same time, it can also reduce the sensitivity of the system and effectively avoid a series of processing problems caused by the poor processability of the third lens. Preferably, R5 and R6 can satisfy 0.8≤R5 / |R6|<1.5. Optionally, in an embodiment in which the optical imaging system includes the first lens to the fourth lens, the object side surface of the third lens may be a convex surface.

[0068] In an exemplary embodiment, the multiple subsequent lenses of the optical imaging system of the present application may include a third lens and a fourth lens. In this exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -3.0<f2 / R5<0, wherein f2 is the effective focal length of the second lens, and R5 is the radius of curvature of the object side of the third lens. More specifically, f2 and R5 may further satisfy -2.76≤f2 / R5≤-0.33. By satisfying the conditional formula -3.0<f2 / R5<0, the optical focal length of the system can be reasonably distributed, so that the camera lens group has a higher aberration correction capability while maintaining miniaturization, and can obtain better processability. Preferably, f2 and R5 may satisfy -3.0<f2 / R5<-2.0.

[0069] In an exemplary embodiment, the multiple subsequent lenses of the optical imaging system of the present application may include a third lens, a fourth lens, and a fifth lens. In this exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -1.5<f4 / f5≤-1.0, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. More specifically, f4 and f5 may further satisfy -1.43≤f4 / f5≤-1.04. Reasonable allocation of the optical focal length of the fourth lens and the fifth lens can, on the one hand, better balance the distortion and astigmatism of the entire system, and on the other hand, is also conducive to obtaining a larger image surface with higher imaging quality. Optionally, in an embodiment in which the optical imaging system includes the first lens to the fifth lens, the fourth lens may have a positive optical focal length, and the fifth lens may have a negative optical focal length.

[0070] In an exemplary embodiment, the multiple subsequent lenses of the optical imaging system of the present application may include a third lens, a fourth lens, and a fifth lens. In this exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<f / R7+f / R8<2.5, wherein f is the total effective focal length of the optical imaging system, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. More specifically, f, R7, and R8 may further satisfy 1.41≤f / R7+f / R8≤2.25. Satisfying the conditional formula 1.0<f / R7+f / R8<2.5 can effectively reduce the size of the system back end, which is conducive to the miniaturization of the lens. In addition, it can effectively control the secondary reflection ghost image between the fourth lens and the fifth lens to avoid the ghost image being too strong and affecting the actual imaging quality. Optionally, in an embodiment where the optical imaging system includes the first lens to the fifth lens, the object side surface of the fourth lens may be a convex surface, and the image side surface may be a concave surface.

[0071] In an exemplary embodiment, the optical imaging system may further include at least one aperture. The aperture may be positioned appropriately as needed, for example, between the second and third lenses. Optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element on the imaging surface.

[0072] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the four or five lenses mentioned above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and the on-axis spacing between each lens, the volume of the imaging lens can be effectively reduced, the sensitivity of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging system more conducive to production and processing and applicable to portable electronic products. The present application proposes an optical imaging system that can be used for a built-in microscopic shooting lens. The imaging system has the characteristics of microscopic shooting, large field of view, large aperture, high imaging quality and miniaturization, and can match higher pixel sensors and stronger image processing technology.

[0073] 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 object side surface and the image side surface of each lens in the first lens, the second lens and multiple subsequent lenses (for example, the third lens and the fourth lens, or the third lens, the fourth lens and the fifth 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 imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens and multiple subsequent lenses (the third lens and the fourth lens, or the third lens, the fourth lens and the fifth lens) are all aspherical mirror surfaces.

[0074] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging system can be varied to achieve the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although the embodiments are described using four or five lenses as examples, the optical imaging system is not limited to including four or five lenses. If desired, the optical imaging system may also include other numbers of lenses.

[0075] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0076] Example 1

[0077] The following reference Figures 1 to 2D An optical imaging system according to Example 1 of the present application is described. Figure 1 A structural schematic diagram of an optical imaging system according to Example 1 of the present application is shown.

[0078] like Figure 1As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0079] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive 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 convex and its image-side surface S8 being concave. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0080] Table 1 shows the basic parameters of the optical imaging system of Example 1, wherein the units of the curvature radius, thickness and focal length are all millimeters (mm).

[0081]

[0082] Table 1

[0083] Wherein, f is the total effective focal length of the optical imaging system, TL is the distance from the object to the imaging surface S11 of the optical imaging system on the optical axis, and FOV is the maximum field of view of the optical imaging system.

[0084] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the fourth lens E4 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:

[0085]

[0086] 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 、A 16 、A 18 and A 20 .

[0087]

[0088]

[0089] Table 2

[0090] 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 passing through the lens. Figure 2B The astigmatism curve of the optical imaging system of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the optical imaging system of Example 1 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 2A to 2D It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0091] Example 2

[0092] The following reference Figures 3 to 4D 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.

[0093] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0094] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive 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 filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0095] Table 3 shows the basic parameters of the optical imaging system of Example 2, where the units of curvature radius, thickness, 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.

[0096]

[0097] Table 3

[0098]

[0099]

[0100] Table 4

[0101] 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 distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4A to 4D It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following reference Figures 5 to 6D 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.

[0104] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0105] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive 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 convex. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0106] Table 5 shows the basic parameters of the optical imaging system of Example 3, where the units of curvature radius, thickness, 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.

[0107]

[0108] Table 5

[0109] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.0604E-02 -2.4183E-02 -6.3184E-03 -1.3626E-03 2.7181E-04 3.9633E-04 2.2789E-04 9.0819E-05 1.7495E-05 S2 -1.8253E-02 -4.9249E-03 -4.6604E-03 3.0070E-03 -1.0591E-03 5.2759E-04 -1.7636E-04 1.0723E-04 -1.3686E-05 S3 7.3123E-03 2.2824E-02 -2.9389E-03 2.9828E-03 -5.7869E-04 3.8711E-04 -7.0683E-05 3.8743E-05 7.6358E-06 S4 -4.7679E-02 8.1492E-03 -1.2818E-03 3.3395E-04 -7.7003E-05 1.6832E-05 4.8409E-07 -3.6891E-06 3.0691E-07 S5 2.2654E-02 -1.8022E-02 4.1964E-03 -1.0474E-03 3.5321E-04 -1.4440E-04 4.7797E-05 -4.5632E-06 1.2419E-05 S6 -1.3510E-02 -1.1482E-02 1.8374E-03 -3.7880E-04 2.8211E-05 -7.0963E-05 -4.2550E-05 -2.7523E-05 -1.5572E-05 S7 -1.5484E-01 -3.3691E-02 -1.5753E-02 -8.2730E-03 -4.0865E-03 -1.9921E-03 -9.1654E-04 -3.3871E-04 -1.2638E-04 S8 -3.7260E-01 -5.4990E-02 -1.9688E-02 -1.0697E-02 -3.4442E-03 -2.1086E-03 -5.2745E-04 -3.0424E-04 -1.2754E-05

[0110] Table 6

[0111] 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 distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 6D The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 6A to 6D It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0112] Example 4

[0113] The following reference Figures 7 to 8D 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.

[0114] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0115] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. 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 convex and its image-side surface S8 being concave. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0116] Table 7 shows the basic parameters of the optical imaging system of Example 4, where the units of curvature radius, thickness, 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.

[0117]

[0118]

[0119] Table 7

[0120] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.0112E-02 -2.0476E-03 -8.0894E-04 -4.1079E-04 -1.9858E-04 -5.6165E-05 -1.8866E-05 5.1409E-06 -7.6854E-07 S2 4.3955E-04 4.4041E-04 -1.3260E-03 1.9378E-04 -1.2366E-04 5.2175E-05 -6.3378E-06 -1.0907E-07 -4.5662E-06 S3 3.0246E-03 3.0816E-03 -7.3581E-04 2.1572E-04 -5.6267E-05 2.5477E-05 -2.0517E-06 1.0144E-06 -2.4437E-06 S4 -1.2278E-02 1.4474E-03 -1.2083E-04 2.0845E-05 4.6430E-06 2.4632E-06 3.7481E-06 -1.0631E-06 -3.2628E-07 S5 1.5995E-02 -2.0474E-02 4.6399E-04 -6.5811E-04 -1.4737E-06 -4.5515E-05 -1.7236E-05 -9.6526E-06 -1.7857E-07 S6 -2.1332E-02 -2.8260E-02 -1.0097E-03 -3.0534E-04 -1.3311E-04 1.0161E-05 -2.6996E-05 7.3397E-07 4.6423E-06 S7 -3.5343E-01 -1.9354E-02 -7.9167E-03 -6.1541E-03 1.6491E-04 -3.8908E-04 4.2889E-04 9.9806E-05 9.2861E-05 S8 -1.4456E+00 1.6909E-01 -5.6940E-02 1.5935E-02 -4.3235E-03 2.1381E-03 -2.6675E-04 2.7739E-04 -3.8012E-05

[0121] Table 8

[0122] 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 distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8A to 8D It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0123] Example 5

[0124] The following reference Figures 9 to 10D 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.

[0125] like Figure 9 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0126] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive 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 concave. The filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0127] Table 9 shows the basic parameters of the optical imaging system of Example 5, where the units of curvature radius, thickness, 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.

[0128]

[0129]

[0130] Table 9

[0131] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.3785E-01 9.1685E-01 -1.2767E+01 9.1569E+01 -3.7660E+02 8.5971E+02 -9.0183E+02 6.3155E+01 3.5877E+02 S2 -2.1707E-01 4.6988E+00 -4.6299E+01 3.5325E+02 -2.1305E+03 9.2500E+03 -2.5959E+04 4.0997E+04 -2.7384E+04 S3 -3.2512E-01 7.3026E+00 -1.0108E+02 1.2014E+03 -1.0366E+04 5.8857E+04 -2.0559E+05 3.9790E+05 -3.2528E+05 S4 -5.7452E-01 1.6342E+00 -1.3847E+01 7.1651E+02 -1.4565E+04 1.4816E+05 -8.2085E+05 2.3689E+06 -2.7891E+06 S5 5.4369E-01 -2.3985E+00 8.6322E+00 -3.4254E+01 1.0997E+02 -2.5377E+02 3.7712E+02 -3.1934E+02 1.1502E+02 S6 2.8889E-01 -1.0913E+00 3.8471E+00 -1.5953E+01 4.4579E+01 -8.0707E+01 9.0686E+01 -5.7457E+01 1.5670E+01 S7 2.6865E-01 -4.7670E+00 1.9732E+01 -5.5880E+01 1.1320E+02 -1.5912E+02 1.4551E+02 -7.7239E+01 1.7915E+01 S8 -1.4941E+00 2.1783E+00 -2.7098E+00 2.5735E+00 -1.7925E+00 8.3490E-01 -2.1710E-01 1.4958E-02 3.6518E-03

[0132] Table 10

[0133] 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 distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 10D The magnification chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 10A to 10D It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0134] Example 6

[0135] The following reference Figures 11 to 12D 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.

[0136] like Figure 11 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a filter E5 and an imaging surface S11.

[0137] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. 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 filter E5 has an object-side surface S9 and an image-side surface S10. Light from the object sequentially passes through each of the surfaces S1 to S10 and is ultimately imaged on the imaging surface S11.

[0138] Table 11 shows the basic parameters of the optical imaging system of Example 6, where the units of curvature radius, thickness, 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]

[0141] Table 11

[0142] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.5758E-02 6.0893E-05 -3.3705E-04 -3.9687E-04 -2.6662E-04 -9.9648E-05 -3.0868E-05 1.1640E-05 2.0081E-06 S2 4.0042E-03 -1.0722E-03 -6.7706E-04 -2.4433E-04 -5.3877E-05 2.0144E-05 1.5569E-05 2.6997E-06 3.0345E-07 S3 5.1459E-03 -7.8929E-04 -2.6031E-04 -4.7289E-05 -1.1840E-05 1.8631E-05 9.0170E-06 4.8820E-06 -2.0504E-06 S4 -8.6139E-03 3.8588E-04 -3.2190E-05 1.5758E-06 1.1347E-05 6.5780E-06 9.9465E-06 2.3526E-06 1.7099E-06 S5 -4.0550E-02 -2.7330E-02 -3.2207E-03 -2.1646E-03 -7.2937E-04 -3.8025E-04 -1.3237E-04 -3.4638E-05 -1.0677E-05 S6 -8.6351E-02 -3.1270E-02 -3.9870E-03 -2.3373E-03 -1.0029E-03 -1.6350E-04 1.7317E-04 2.1719E-05 9.1708E-06 S7 -2.8760E-01 5.5969E-02 -5.2424E-03 -8.8584E-03 2.6398E-03 -1.4024E-03 1.1668E-03 -3.0606E-04 2.3597E-04 S8 -1.4729E+00 2.9475E-01 -8.4048E-02 2.2067E-02 -1.0001E-02 2.9580E-03 -4.3317E-04 3.7191E-04 -1.6299E-06

[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 distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 12D The magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 12A to 12D 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 14D 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 13As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

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

[0149] Table 13 shows the basic parameters of the optical imaging system of Example 7, where the units of curvature radius, thickness, 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.

[0150]

[0151] Table 13

[0152] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.0463E-01 -3.0478E-01 3.1682E+00 -3.2878E+01 1.9658E+02 -7.4242E+02 1.6863E+03 -2.1261E+03 1.1395E+03 S2 -8.8645E-01 1.4050E+01 -1.1934E+02 4.7926E+02 -1.2757E+02 -6.9019E+03 2.8561E+04 -4.9421E+04 3.2859E+04 S3 -8.5708E-01 2.2264E+01 -2.0609E+02 1.0562E+03 -2.2907E+03 -3.2719E+03 3.0774E+04 -6.6705E+04 5.1137E+04 S4 -1.5662E+00 1.8989E+01 -1.6475E+02 9.3222E+02 -3.1335E+03 4.4436E+03 5.9327E+03 -3.0171E+04 3.1139E+04 S5 1.1447E+00 -2.0998E+01 2.3553E+02 -2.0028E+03 1.1731E+04 -4.5781E+04 1.1291E+05 -1.5880E+05 9.6758E+04 S6 -5.8344E-01 1.2603E+00 -6.3864E+00 2.8812E+00 1.0190E+02 -5.6816E+02 1.5372E+03 -2.1824E+03 1.2959E+03 S7 -2.1126E-01 7.6329E-01 -3.7361E+00 9.3484E+00 -1.4258E+01 8.7117E+00 6.7479E+00 -1.2642E+01 5.0307E+00 S8 -3.5097E-01 1.5284E+00 -6.3392E+00 1.5776E+01 -2.6716E+01 3.1083E+01 -2.3236E+01 9.8601E+00 -1.7884E+00 S9 1.5323E+00 -2.0339E+01 1.2234E+02 -4.9764E+02 1.4391E+03 -3.0017E+03 4.5368E+03 -4.9527E+03 3.8553E+03 S10 -1.1410E+00 1.6570E+00 -3.9502E-01 -4.6404E+00 1.2430E+01 -1.8153E+01 1.7785E+01 -1.2395E+01 6.2483E+00

[0153] Face number A22 A24 A26 A28 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -2.0824E+03 7.4061E+02 -1.5580E+02 1.4676E+01 S10 -2.2513E+00 5.5305E-01 -8.3019E-02 5.7234E-03

[0154] Table 14

[0155] 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 distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 14D The magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 14A to 14D It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0156] Example 8

[0157] The following reference Figures 15 to 16DAn 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.

[0158] like Figure 15 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0159] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface S13.

[0160] Table 15 shows the basic parameters of the optical imaging system of Example 8, where the units of curvature radius, thickness, 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.

[0161]

[0162] Table 15

[0163]

[0164]

[0165] Face number A22 A24 A26 A28 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 6.9070E-05 -6.1636E-06 2.1697E-05 -3.7148E-05 S10 -1.4049E-04 2.8544E-05 -3.0474E-05 2.8420E-05

[0166] Table 16

[0167] 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 distortion curve of the optical imaging system of Example 8 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 16DThe magnification chromatic aberration curve of the optical imaging system of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 16A to 16D It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0168] Example 9

[0169] The following reference Figures 17 to 18D 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.

[0170] like Figure 17 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0171] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface S13.

[0172] Table 17 shows the basic parameters of the optical imaging system of Example 9, where the units of curvature radius, thickness, 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.

[0173]

[0174]

[0175] Table 17

[0176] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.6865E-02 -5.2413E-03 -1.1706E-03 -2.3021E-04 -4.5387E-05 -1.8904E-05 1.3838E-06 3.7639E-06 8.5778E-06 S2 -8.0683E-04 -2.9134E-03 -5.9966E-04 7.6771E-04 -4.3815E-04 1.5995E-04 -3.4969E-05 8.0596E-06 4.9983E-06 S3 2.9973E-02 6.1080E-03 -8.1603E-04 1.0577E-03 -4.1563E-04 1.6047E-04 -3.9593E-05 1.2557E-05 1.5895E-06 S4 -3.3341E-02 5.1513E-03 -1.3116E-03 3.1555E-04 -9.4262E-05 2.5250E-05 -2.3542E-06 -5.8385E-07 6.8237E-07 S5 -5.7673E-02 -9.7832E-04 -3.3458E-04 -2.5532E-04 2.6056E-05 -3.2004E-05 7.5396E-06 -5.7956E-07 6.0226E-07 S6 -1.4483E-01 1.4178E-02 -1.9515E-03 5.0198E-04 -7.4377E-05 1.8747E-05 6.0854E-06 8.8253E-06 8.4250E-06 S7 -6.8818E-02 -1.1472E-03 -1.7474E-03 1.0255E-03 2.1780E-04 -2.1974E-04 -4.9571E-05 2.6119E-05 1.5227E-05 S8 6.3800E-02 -2.5686E-02 4.4071E-03 1.5175E-03 5.1477E-04 -9.1378E-04 -1.0540E-04 6.9269E-05 1.3392E-05 S9 -2.7991E-01 8.3160E-02 -9.1520E-03 2.4454E-03 2.9736E-03 -6.2827E-04 -7.4065E-04 -4.5743E-04 -4.9378E-05 S10 -7.0011E-02 -7.0495E-03 1.2698E-02 -9.8901E-03 7.9717E-03 -4.6670E-03 2.3139E-03 -1.5398E-03 7.9606E-04

[0177] Face number A22 A24 A26 A28 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.7079E-04 -4.7103E-06 7.7906E-05 -7.4149E-05 S10 -4.3664E-04 2.2685E-04 -5.2700E-05 2.1394E-05

[0178] Table 18

[0179] Figure 18AThe 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 distortion curve of the optical imaging system of Example 9 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 18D 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 18D It can be seen that the optical imaging system provided in Example 9 can achieve good imaging quality.

[0180] Example 10

[0181] The following reference Figures 19 to 20D An optical imaging system according to Example 10 of the present application is described. Figure 19 A structural schematic diagram of an optical imaging system according to Example 10 of the present application is shown.

[0182] like Figure 19 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0183] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface S13.

[0184] Table 19 shows the basic parameters of the optical imaging system of Example 10, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 20 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 10, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0185]

[0186] Table 19

[0187] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -6.6144E-03 -3.3137E-03 -8.7991E-04 -2.0522E-04 -4.5818E-05 -6.7261E-06 -2.3306E-06 1.3645E-06 2.6722E-06 S2 2.5660E-03 -4.8785E-03 1.2930E-03 -5.3153E-04 1.4593E-04 -1.4837E-05 1.1048E-05 -1.5118E-06 4.7294E-06 S3 3.1655E-02 1.1550E-03 1.6140E-03 -3.5288E-04 1.4382E-04 -4.8525E-06 7.5258E-06 1.2852E-06 3.0580E-06 S4 -3.0822E-02 2.7158E-04 -4.1970E-06 -4.8905E-05 1.6033E-05 -2.4404E-07 2.0788E-06 -2.3051E-06 1.7636E-06 S5 -6.7353E-02 -1.3815E-03 -6.5760E-06 1.2350E-04 1.4436E-05 1.7348E-05 4.0448E-06 8.1710E-06 2.2710E-06 S6 -9.5933E-02 8.0250E-03 6.8149E-04 4.8025E-04 5.3911E-05 3.5492E-05 1.5440E-05 9.4235E-06 6.5483E-06 S7 -6.5094E-02 2.9226E-03 1.0189E-03 2.1011E-04 -1.2685E-04 1.6756E-04 -1.0891E-07 -2.1247E-05 -2.9609E-05 S8 -9.1796E-02 3.3353E-03 2.5561E-03 -5.9911E-04 -2.4953E-04 2.7483E-04 -6.4631E-06 -8.1749E-06 -3.5031E-05 S9 -5.7046E-01 1.1014E-01 1.7100E-03 -5.4055E-03 2.0807E-03 -1.9259E-03 7.4757E-04 -5.4798E-04 3.1458E-04 S10 -1.2833E+00 3.2165E-01 -1.0047E-01 3.3213E-02 -1.4633E-02 5.6591E-03 -2.5953E-03 7.8154E-04 -2.5394E-04

[0188] Face number A22 A24 A26 A28 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.0709E-04 9.3307E-05 -1.5946E-05 1.6046E-05 S10 1.1417E-05 6.9569E-05 -2.8655E-05 9.9264E-05

[0189] Table 20

[0190] Figure 20A The axial chromatic aberration curve of the optical imaging system of Example 10 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 20B An astigmatism curve of the optical imaging system of Example 10 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 20C The distortion curve of the optical imaging system of Example 10 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 20D The magnification chromatic aberration curve of the optical imaging system of Example 10 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 20A to 20D It can be seen that the optical imaging system provided in Example 10 can achieve good imaging quality.

[0191] Example 11

[0192] The following reference Figures 21 to 22D An optical imaging system according to Example 11 of the present application is described. Figure 21 A structural schematic diagram of an optical imaging system according to Example 11 of the present application is shown.

[0193] like Figure 21 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0194] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface S13.

[0195] Table 21 shows the basic parameters of the optical imaging system of Example 11, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 22 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 11, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0196]

[0197]

[0198] Table 21

[0199] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -5.9506E-03 -3.3289E-03 -9.3208E-04 -2.1059E-04 -4.6646E-05 -5.5012E-06 -2.0758E-06 1.7313E-06 2.6082E-06 S2 1.2679E-03 -4.5045E-03 1.1585E-03 -4.3216E-04 1.2659E-04 -5.7174E-06 9.9125E-06 -2.0088E-06 2.4501E-06 S3 3.1646E-02 1.4600E-03 1.5263E-03 -2.6887E-04 1.2598E-04 3.4920E-06 5.6731E-06 3.5874E-07 9.0321E-07 S4 -3.1164E-02 -1.0312E-04 -1.7471E-05 -2.7918E-05 1.2118E-05 6.6008E-07 8.0432E-07 -2.4671E-06 1.3758E-06 S5 -6.9932E-02 -4.3326E-04 5.7672E-05 1.4654E-04 3.4517E-06 1.0448E-05 -3.9283E-07 6.4449E-06 1.7065E-06 S6 -8.9982E-02 1.0148E-02 6.2520E-04 4.6445E-04 1.2850E-05 2.1112E-05 1.0931E-05 1.0458E-05 7.4963E-06 S7 -6.7951E-02 3.2367E-03 2.5804E-04 5.0068E-04 -1.5255E-05 1.7628E-04 -3.2265E-05 -2.9219E-05 -3.6193E-05 S8 -1.2704E-01 4.8066E-03 1.0266E-03 -2.8903E-04 4.2984E-05 2.6514E-04 -3.0470E-05 -9.9636E-06 -4.2783E-05 S9 -6.0416E-01 1.0484E-01 -3.8940E-03 -4.3394E-03 6.4514E-04 -1.2749E-03 3.7158E-04 -3.4734E-04 1.9295E-04 S10 -1.3208E+00 3.0838E-01 -9.4050E-02 2.9868E-02 -1.3194E-02 4.8474E-03 -1.9956E-03 4.8474E-04 -6.9987E-05

[0200] Face number A22 A24 A26 A28 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 8.6641E-06 7.8278E-05 2.3685E-05 -7.3753E-07 S10 -7.7746E-05 1.3345E-04 -4.3684E-05 1.0924E-04

[0201] Table 22

[0202] Figure 22A The axial chromatic aberration curve of the optical imaging system of Example 11 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 22B An astigmatism curve of the optical imaging system of Example 11 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 22C The distortion curve of the optical imaging system of Example 11 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 22D The magnification chromatic aberration curve of the optical imaging system of Example 11 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 22A to 22D It can be seen that the optical imaging system provided in Example 11 can achieve good imaging quality.

[0203] Example 12

[0204] The following reference Figures 23 to 24D An optical imaging system according to Example 12 of the present application is described. Figure 23 A structural schematic diagram of an optical imaging system according to Example 12 of the present application is shown.

[0205] like Figure 23 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a flat glass P, a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0206] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes through each surface S1 to S12 in sequence and is ultimately imaged on the imaging surface S13.

[0207] Table 23 shows the basic parameters of the optical imaging system of Example 12, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 24 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 12, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0208]

[0209] Table 23

[0210] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.4856E-03 -4.7433E-03 -1.2544E-03 -2.2545E-04 -2.2088E-05 1.2662E-05 7.3881E-06 4.9846E-06 2.0912E-06 S2 -2.0728E-03 -3.8540E-03 1.2929E-03 -3.2345E-04 9.7592E-05 1.7193E-07 9.4147E-07 8.9487E-07 3.4358E-06 S3 2.9143E-02 2.0971E-03 1.4163E-03 -2.2254E-04 8.1164E-05 2.9253E-06 -3.3752E-06 2.0416E-06 -4.0765E-07 S4 -2.2384E-02 -6.9419E-05 -1.1652E-04 -5.4958E-05 2.4127E-06 1.2029E-06 1.5266E-06 -2.0104E-06 -4.6053E-08 S5 -7.1264E-02 -2.1492E-03 -5.2500E-04 -2.2896E-05 -4.8219E-05 -1.0363E-05 -1.0872E-05 -1.9981E-06 -1.7252E-06 S6 -1.2036E-01 1.0414E-02 -1.7892E-04 5.1619E-04 -3.8241E-05 1.5587E-05 -8.2079E-06 -2.7544E-06 1.1294E-06 S7 -4.7968E-02 4.7804E-03 -2.8286E-03 2.2754E-05 -3.9330E-04 1.2010E-04 -7.9980E-05 1.1089E-05 -1.8932E-05 S8 -1.0384E-01 3.5206E-03 2.1209E-03 -1.9695E-03 -2.4335E-04 1.2623E-04 -3.7356E-05 5.2637E-05 -5.8507E-06 S9 -6.7461E-01 2.0066E-01 4.6598E-03 -1.4024E-02 1.1602E-04 -1.5498E-03 2.0612E-03 -7.9766E-04 4.1025E-04 S10 -1.3034E+00 3.3456E-01 -8.3598E-02 3.6149E-02 -1.5111E-02 5.8801E-03 -2.2492E-03 9.4620E-04 -3.2997E-04

[0211]

[0212]

[0213] Table 24

[0214] Figure 24A The axial chromatic aberration curve of the optical imaging system of Example 12 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the lens. Figure 24B An astigmatism curve of the optical imaging system of Example 12 is shown, which represents meridional field curvature and sagittal field curvature. Figure 24C The distortion curve of the optical imaging system of Example 12 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 24D The magnification chromatic aberration curve of the optical imaging system of Example 12 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 24A to 24D It can be seen that the optical imaging system provided in Example 12 can achieve good imaging quality.

[0215] In summary, Examples 1 to 12 respectively satisfy the relationships shown in Table 25.

[0216]

[0217] Table 25

[0218] 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.

[0219] 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: Flat glass; The first lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex; a second lens having negative optical power, wherein the object-side surface and the image-side surface are concave; a third lens element having optical power and a convex object-side surface; and a fourth lens having optical power; The third lens has positive optical power, and the fourth lens has negative optical power; or, both the third lens and the fourth lens have negative optical power; or, both the third lens and the fourth lens have positive optical power; The number of lenses having optical power in the optical imaging system is four; The maximum field of view (FOV) of the optical imaging system satisfies 40.9°≤FOV≤48.1°; The curvature radius R3 of the object-side surface of the second lens and the curvature radius R4 of the image-side surface of the second lens satisfy -0.45≤R3 / R4<0; The effective focal length f2 of the second lens and the curvature radius R5 of the object-side surface of the third lens satisfy -2.76≤f2 / R5≤-0.33; and The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 0.82≤f / EPD≤1.

10.

2. The optical imaging system according to claim 1, wherein: A distance TL from the object to the imaging plane of the optical imaging system on the optical axis satisfies 6.68 mm ≤ TL ≤ 6.80 mm.

3. The optical imaging system according to claim 1, wherein: The maximum image height ImgH of the optical imaging system and the maximum height Do of the object being photographed satisfy 1.0≤ImgH / Do≤1.

18.

4. The optical imaging system according to claim 1, wherein: An entrance pupil diameter EPD of the optical imaging system and a maximum image height ImgH of the optical imaging system satisfy 0.68≤EPD / ImgH≤0.

81.

5. The optical imaging system according to claim 1, wherein: A total effective focal length f of the optical imaging system and a distance BFL on the optical axis from the image side surface of a lens closest to the imaging surface of the optical imaging system to the imaging surface satisfy 1.22≤f / BFL≤1.

45.

6. The optical imaging system according to claim 1, wherein: A curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens satisfy -0.93≤R1 / R2≤-0.

84.

7. The optical imaging system according to claim 1, wherein: A total effective focal length f of the optical imaging system and a combined focal length f12 of the first lens and the second lens satisfy 0.63≤f / f12≤0.

74.

8. The optical imaging system according to claim 1, wherein: A distance To from the object to the object-side surface of the first lens on the optical axis and an entrance pupil diameter EPD of the optical imaging system satisfy 2.34≤To / EPD≤2.

73.

9. The optical imaging system according to claim 1, wherein: A distance T34 between the third lens and the fourth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.38≤T34 / CT4≤1.

61.

10. The optical imaging system according to claim 9, wherein: The curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy 0.34≤R5 / R6 ≤1.17.

Images