Optical image capturing system

Abstract

The invention discloses an optical imaging system. The optical imaging system sequentially comprises plain glass, a first lens, a second lens and a third lens from an object side to an image side along an optical axis, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power or negative focal power; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; and the fifth lens has negative focal power. The number of the lenses with focal power in the optical imaging system is five; the maximum field angle FOV of the optical imaging system is more than or equal to 50.3 degrees and less than or equal to 59.0 degrees; and the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy-0.45 < = R3 / R4 < =-0.19.

Description

[0001] Divisional Application Statement

[0002] This application is a divisional application of the Chinese invention patent application with invention name “Optical Imaging System” and application number 202010100691.8 filed on February 18, 2020. Technical Field

[0003] The present application relates to an optical imaging system, and more particularly, to an optical imaging system including four or five lenses. Background Art

[0004] As major mobile phone manufacturers regard shooting ability as one of the most important performance indicators of mobile phones, telephoto, wide-angle, macro, large aperture and large image surface lenses have become standard for mobile phone cameras.

[0005] In the field of microscope lenses, due to the need for microscopic photography, the focus is usually on capturing clear local details of the object being photographed, while the field of view design of the microscope lens is often ignored. Therefore, how to ensure that the local part of the object being photographed is captured clearly while designing the microscope lens to have a larger field of view so that it can obtain a larger field of view and provide a better user experience is a great challenge for optical design. Summary of the invention

[0006] The present application provides an optical imaging system that can be applied 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.

[0007] 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.

[0008] In one embodiment, the maximum field of view FOV of the optical imaging system may satisfy FOV ≥ 40°.

[0009] 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.

[0010] 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.

[0011] In one embodiment, the maximum image height ImgH of the optical imaging system and the maximum height Do of the photographed object may satisfy ImgH / Do≥1.0.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] In one embodiment, the multiple subsequent lenses of the optical imaging system may include a third lens and a fourth lens, and the spacing distance 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.

[0019] 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.

[0020] 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.

[0021] In one embodiment, the plurality of 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.

[0022] 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.

[0023] The present application adopts four or five lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial 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

[0024] 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:

[0025] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

[0026] FIG. 2A to FIG. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 1 are respectively shown;

[0027] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0028] FIG. 4A to FIG. 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 2 are respectively shown;

[0029] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0030] FIG. 6A to FIG. 6D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 3 are respectively shown;

[0031] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0032] FIG. 8A to FIG. 8D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 4 are respectively shown;

[0033] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0034] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 5 are respectively shown;

[0035] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0036] FIG. 12A to FIG. 12D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown;

[0037] Fig.13 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0038] FIG. 14A to FIG. 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;

[0039] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0040] FIG. 16A to FIG. 16D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 8 are respectively shown;

[0041] Fig.17 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown;

[0042] 18A to 18D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 9 are respectively shown;

[0043] Fig.19 A schematic structural diagram of an optical imaging system according to Embodiment 10 of the present application is shown;

[0044] FIG. 20A to FIG. 20D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 10 are respectively shown;

[0045] Fig.21 A schematic structural diagram of an optical imaging system according to Embodiment 11 of the present application is shown;

[0046] FIG. 22A to FIG. 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;

[0047] Fig.23 A schematic structural diagram of an optical imaging system according to Embodiment 12 of the present application is shown;

[0048] FIG. 24A to FIG. 24D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 12 are shown respectively. DETAILED DESCRIPTION

[0049] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0051] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0052] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0053] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0054] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0055] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] The features, principles and other aspects of the present application are described in detail below.

[0057] The optical imaging system according to an exemplary embodiment of the present application may include a flat glass arranged in sequence from the object side to the image side along the optical axis, and a first lens, a second lens, and a plurality of subsequent lenses having optical power. In an exemplary embodiment, the first lens may have a positive optical power, and the second lens may have a negative optical power. In an exemplary embodiment, an air gap may be provided between any two adjacent optical elements.

[0058] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula FOV ≥ 40°, where FOV is the maximum field of view of the optical imaging system. More specifically, FOV may further satisfy 40° ≤ FOV ≤ 60°, for example, 40.9° ≤ FOV ≤ 59.0°. Satisfying the conditional formula FOV ≥ 40° is not only conducive to obtaining a larger field of view of the object during the actual shooting process, but also ensures that the imaging position of the object can be quickly found during the shooting process, so that consumers have a better sense of use.

[0059] 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 a concave surface, and the image side surface may be a concave surface.

[0060] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula TL≤7.0mm, where TL is the distance on the optical axis from the object to the imaging surface of the optical imaging system. More specifically, TL may further satisfy 6.5mm≤TL≤7.0mm, for example, 6.68mm≤TL≤6.80mm. Since the optical imaging system of the present application is a built-in microscope camera lens, controlling the distance from the object to the imaging surface to be less than 7.0mm can effectively reduce the overall size of the camera lens group, realize the ultra-thin characteristics and miniaturization of the camera lens group, and meet the requirements of today's mobile phones to be thin and light.

[0061] 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. The ratio of the image height to the object height of the object being photographed is controlled to be greater than 1 to ensure a sufficiently large magnification to ensure that the local details of the object being photographed are clearly captured, so that the microscopic structure of the object can be studied to achieve the effect of a microscope.

[0062] 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.

[0063] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula f / EPD<1.2, wherein 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, the optical system has a larger 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, and a good imaging effect can be achieved even when shooting in dark scenes.

[0064] 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 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 debugging process on the module side, and on the other hand, the lens may shoot a target plate (the subject is placed in the upper and lower glass cover plates) in actual use, and having a sufficiently long back focal length can ensure that the lens finds the best focus point in this case.

[0065] 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 a 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 of the lens surface due to steep light, thereby causing processability problems in actual processing and molding. Optionally, the object side surface of the first lens may be a convex surface, and the image side surface may be a convex surface.

[0066] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 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 lens and the second lens. More specifically, f and f12 may further satisfy 0.33≤f / f12≤0.74. Reasonable allocation of the combined focal length of the first lens and the second lens can not only reduce the sensitivity of the two lenses and avoid overly strict tolerance requirements, but also better complement and eliminate the astigmatism, spherical aberration, etc. caused by the first lens and the second lens, thereby improving the overall imaging quality and obtaining better resolution.

[0067] 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 a failure 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.

[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 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. Meeting 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 assembly due to too thin a lens; at the same time, it is also beneficial to reduce light deflection, adjust the field curvature of the lens, reduce sensitivity, and thus obtain better imaging quality.

[0069] 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 can 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.

[0070] 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 power 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.

[0071] 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 power 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 plane 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 power, and the fifth lens may have a negative optical power.

[0072] 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 of the fourth lens, and R8 is the radius of curvature of the image side 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 rear end of the system, 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 in which the optical imaging system includes the first lens to the fifth lens, the object side of the fourth lens may be a convex surface, and the image side may be a concave surface.

[0073] In an exemplary embodiment, the optical imaging system may further include at least one aperture. The aperture may be disposed at an appropriate position as required, for example, between the second lens and the third lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0074] 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 axial spacing between lenses, etc., 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, so that the optical imaging system is more conducive to production and processing and can be applied 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.

[0075] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface 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 occurring during imaging can be eliminated as much as possible, thereby improving the 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.

[0076] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although four or five lenses are used as examples in the embodiments, the optical imaging system is not limited to including four or five lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0077] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0078] Example 1

[0079] The following reference Figures 1 to 2D An optical imaging system according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0080] like Figure 1 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0081] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative power, its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0082] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm).

[0083]

[0084] Table 1

[0085] 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.

[0086] 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, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0087]

[0088] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A18 and A 20 .

[0089]

[0090]

[0091] Table 2

[0092] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 2B An astigmatism curve of the optical imaging system of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2C The distortion curve of the optical imaging system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 2A to FIG. 2D It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0093] Example 2

[0094] The following reference Figures 3 to 4D The optical imaging system according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging system according to Example 2 of the present application is shown.

[0095] like Figure 3 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0096] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0097] Table 3 shows the basic parameters of the optical imaging system of Example 2, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0098]

[0099]

[0100] Table 3

[0101] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.8957E-02 -1.0534E-02 -3.3634E-03 -1.1278E-03 -2.0322E-04 5.0100E-05 7.6473E-05 5.0653E-05 1.4820E-05 S2 -5.2581E-03 5.3180E-04 -3.8544E-03 1.5602E-03 -5.2146E-04 3.1108E-04 -1.0050E-04 3.1972E-05 -1.8704E-05 S3 4.0250E-03 1.3878E-02 -2.4683E-03 1.3898E-03 -3.3932E-04 1.7060E-04 -4.7486E-05 5.1136E-06 -1.0279E-05 S4 -2.8090E-02 4.7494E-03 -5.6623E-04 1.3176E-04 -1.8360E-05 4.9593E-06 3.0840E-06 -2.6008E-06 -1.5473E-06 S5 2.8027E-02 -1.5561E-02 2.6993E-03 -7.6012E-04 1.8386E-04 -1.0721E-04 -1.1971E-05 -2.7901E-05 -7.0298E-06 S6 -9.5653E-03 -9.7433E-03 5.9579E-04 -2.1749E-04 -4.8320E-05 -5.1348E-05 -4.4171E-05 -2.9746E-05 -1.6794E-05 S7 -3.2657E-01 -1.6908E-02 -1.1601E-02 -4.0555E-03 -1.7132E-03 -7.7965E-04 -3.5844E-04 -1.4814E-04 -6.7778E-05 S8 -8.6561E-01 4.4878E-02 -2.4844E-02 1.4128E-03 -1.6155E-03 -2.1536E-04 1.7333E-06 -6.6660E-05 8.5748E-05

[0102] Table 4

[0103] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4B An astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 4A to FIG. 4D It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0104] Example 3

[0105] The following reference Figures 5 to 6D An optical imaging system according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown.

[0106] like Figure 5 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0107] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0108] Table 5 shows the basic parameters of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0109]

[0110]

[0111] Table 5

[0112] 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

[0113] Table 6

[0114] Fig. 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6B An astigmatism curve of the optical imaging system of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6C The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.6D The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 6A to FIG. 6D It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0115] Example 4

[0116] The following reference Figures 7 to 8D An optical imaging system according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown.

[0117] like Figure 7As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0118] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0119] Table 7 shows the basic parameter table of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0120]

[0121]

[0122] Table 7

[0123] 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

[0124] Table 8

[0125] Fig. 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8B An astigmatism curve of the optical imaging system of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8C The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.8D The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 8A to FIG. 8D It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0126] Example 5

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

[0128] like Fig. 9 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0129] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0130] Table 9 shows the basic parameters of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0131]

[0132]

[0133] Table 9

[0134] 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

[0135] Table 10

[0136] Fig. 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 10B An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 10C The distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig. 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. FIG. 10A to FIG. 10D It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0137] Example 6

[0138] The following reference Figures 11 to 12D An optical imaging system according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging system according to Example 6 of the present application is shown.

[0139] like Fig.11 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a plane 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.

[0140] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0141] Table 11 shows the basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0142]

[0143]

[0144] Table 11

[0145] 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

[0146] Table 12

[0147] Fig. 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 12B An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 12C The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12D The magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 12A to FIG. 12DIt can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0148] Example 7

[0149] The following reference Figures 13 to 14D An optical imaging system according to Example 7 of the present application is described. Fig.13 A schematic structural diagram of an optical imaging system according to Example 7 of the present application is shown.

[0150] like Fig.13 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0151] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0152] Table 13 shows the basic parameters of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0153]

[0154] Table 13

[0155] 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

[0156] 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

[0157] Table 14

[0158] Fig.14A The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 14B An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 14CThe distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14D The magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 14A to FIG. 14D It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0159] Example 8

[0160] The following reference Figures 15 to 16D An optical imaging system according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical imaging system according to Example 8 of the present application is shown.

[0161] like Fig.15 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0162] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is concave, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0163] Table 15 shows the basic parameter table of the optical imaging system of Example 8, wherein the units of the radius of curvature, thickness and focal length are all millimeters (mm). Table 16 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0164]

[0165] Table 15

[0166]

[0167]

[0168] Table 16

[0169] Fig.16AThe axial chromatic aberration curve of the optical imaging system of Example 8 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 16B An astigmatism curve of the optical imaging system of Example 8 is shown, which indicates meridional image curvature and sagittal image curvature. Fig. 16C The distortion curve of the optical imaging system of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16D The magnification chromatic aberration curve of the optical imaging system of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 16A to FIG. 16D It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0170] Example 9

[0171] The following reference Figures 17 to 18D An optical imaging system according to Example 9 of the present application is described. Fig.17 A schematic structural diagram of an optical imaging system according to Example 9 of the present application is shown.

[0172] like Fig.17 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0173] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

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

[0175]

[0176]

[0177] Table 17

[0178] 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

[0179] 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

[0180] Table 18

[0181] Fig.18A The axial chromatic aberration curve of the optical imaging system of Example 9 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.18B An astigmatism curve of the optical imaging system of Example 9 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig.18C The distortion curve of the optical imaging system of Example 9 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.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.

[0182] Example 10

[0183] The following reference Figures 19 to 20D An optical imaging system according to Example 10 of the present application is described. Fig.19 A schematic structural diagram of an optical imaging system according to Example 10 of the present application is shown.

[0184] like Fig.19 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0185] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0186] Table 19 shows the basic parameter table of the optical imaging system of Example 10, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 20 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 10, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0187]

[0188] Table 19

[0189]

[0190]

[0191] Table 20

[0192] Fig. 20A The axial chromatic aberration curve of the optical imaging system of Example 10 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 20B An astigmatism curve of the optical imaging system of Example 10 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 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. Fig.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. FIG. 20A to FIG. 20D It can be seen that the optical imaging system provided in Example 10 can achieve good imaging quality.

[0193] Embodiment 11

[0194] The following reference Figures 21 to 22D An optical imaging system according to Example 11 of the present application is described. Fig.21 A schematic structural diagram of an optical imaging system according to Example 11 of the present application is shown.

[0195] like Fig.21 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0196] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0197] Table 21 shows the basic parameter table of the optical imaging system of Example 11, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 22 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 11, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0198]

[0199]

[0200] Table 21

[0201] 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

[0202] 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

[0203] Table 22

[0204] Fig.22A The axial chromatic aberration curve of the optical imaging system of Example 11 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 22B An astigmatism curve of the optical imaging system of Example 11 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig. 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. Fig.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. FIG. 22A to FIG. 22D It can be seen that the optical imaging system provided in Example 11 can achieve good imaging quality.

[0205] Example 12

[0206] The following reference Figures 23 to 24D An optical imaging system according to Example 12 of the present application is described. Fig.23 A schematic structural diagram of an optical imaging system according to Example 12 of the present application is shown.

[0207] like Fig.23 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, a plane 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.

[0208] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0209] Table 23 shows the basic parameter table of the optical imaging system of Example 12, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 24 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 12, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0210]

[0211] Table 23

[0212] 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

[0213] 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 -2.3798E-04 1.1463E-04 -7.5492E-05 2.7475E-05 S10 8.2654E-05 -3.3987E-06 -1.3907E-05 2.1391E-05

[0214] Table 24

[0215] Fig.24A The axial chromatic aberration curve of the optical imaging system of Example 12 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 24B An astigmatism curve of the optical imaging system of Example 12 is shown, which represents the meridional field curvature and the sagittal field curvature. Fig.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. Fig.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. FIG. 24A to FIG. 24D It can be seen that the optical imaging system provided in Example 12 can achieve good imaging quality.

[0216] In summary, Examples 1 to 12 respectively satisfy the relationships shown in Table 25.

[0217]

[0218] Table 25

[0219] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0220] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical imaging system, characterized in that: Along the optical axis from the object side to the image side, they include: Flat glass; The first lens has positive refractive power, and its object-side surface is convex and its image-side surface is convex; The second lens has a negative optical power, and its object side surface is concave and its image side surface is concave; a third lens having positive or negative optical power; a fourth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave; and a fifth lens having negative optical power; The number of lenses having optical power in the optical imaging system is five; The maximum field of view FOV of the optical imaging system satisfies 50.3°≤FOV≤59.0°; 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 satisfy -0.45≤R3 / R4≤-0.

19.

2. The optical imaging system according to claim 1, characterized in that: A distance TL from the object to the imaging surface 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, characterized in that: The maximum image height ImgH of the optical imaging system and the maximum height Do of the photographed object satisfy 1.23≤ImgH / Do≤1.

40.

4. The optical imaging system according to claim 1, characterized in that: An entrance pupil diameter EPD of the optical imaging system and a maximum image height ImgH of the optical imaging system satisfy 0.5<EPD / ImgH≤0.

70.

5. The optical imaging system according to claim 1, characterized in that: The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 0.75≤f / EPD≤0.

88.

6. The optical imaging system according to claim 1, characterized in that: 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 satisfy 1.0≤f / BFL≤1.

31.

7. The optical imaging system according to claim 1, characterized in that: A curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens satisfy -0.64≤R1 / R2≤-0.

5.

8. The optical imaging system according to claim 1, characterized in that: 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 satisfy 0.3≤f / f12≤0.

50.

9. The optical imaging system according to claim 1, characterized in that: A distance To from the photographed 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 1.8≤To / EPD≤2.

26.

10. The optical imaging system according to claim 1, characterized in that: 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 0.45≤T34 / CT4≤0.94.

Images