Optical imaging system

Abstract

The present application discloses an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with negative optical power; a third lens with negative optical power; a fourth lens with optical power, whose object side surface is convex and whose image side surface is concave; and a fifth lens with optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfy: 1.0<TTL / ImgH<1.5.

Description

Technical Field

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

[0002] With the advancement of technology, portable electronic products such as smartphones are developing rapidly. On the one hand, users have higher requirements for the image quality of smartphones and other portable electronic products. On the other hand, while pursuing higher pixel cameras, users also hope that portable electronic products such as smartphones can be made thinner and lighter for easy carrying. However, these two aspects are often in conflict in traditional lens design, and lenses with high image quality are usually larger in size.

[0003] Therefore, how to collect more light information with the shortest possible total lens length, maintain small optical aberrations and good imaging quality, reserve enough physical space for modules and terminal devices, and facilitate the design of portable electronic products such as smartphones is one of the problems that major lens manufacturers urgently need to solve. Summary of the invention

[0004] On one hand, the present application provides such an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with negative optical power; a third lens with negative optical power; a fourth lens with optical power, whose object side surface is convex and whose image side surface is concave; and a fifth lens with optical power. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH can satisfy: 1.0<TTL / ImgH<1.5.

[0005] In one embodiment, at least one mirror surface from the object side surface of the first lens to the image side surface of the fifth lens may be an aspherical mirror surface.

[0006] In one embodiment, the sum of the spacing distances ΣAT between any two adjacent lenses from the first lens to the fifth lens on the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 5.5<ΣAT / T34<9.0.

[0007] In one embodiment, the total effective focal length f of the optical imaging system, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens may satisfy: -2.0<f / (f2+f4)<-0.5.

[0008] In one embodiment, a spacing distance T12 between the first lens and the second lens, a spacing distance T23 between the second lens and the third lens, and a spacing distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 1.5<(T12+T45) / T23<3.5.

[0009] In one embodiment, the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R10 of the image side surface of the fifth lens may satisfy: 1.1<f4 / (|R8|+R10)<2.0.

[0010] In one embodiment, a curvature radius R2 of the image side surface of the first lens, a curvature radius R3 of the object side surface of the second lens, a curvature radius R4 of the image side surface of the second lens, and a curvature radius R6 of the image side surface of the third lens may satisfy: 2.0<(|R6|+R3) / (R2+R4)<5.0.

[0011] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 3.0<CT4 / T34<6.5.

[0012] In one embodiment, the optical imaging system may satisfy: 1.0<ETL / EIN<1.5, wherein ETL is the distance between the object side surface of the first lens at 1 / 2 entrance pupil diameter of the optical imaging system and the imaging plane of the optical imaging system parallel to the optical axis, and EIN is the distance between the object side surface of the first lens at 1 / 2 entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 entrance pupil diameter of the optical imaging system parallel to the optical axis.

[0013] In one embodiment, an edge thickness ET5 of the fifth lens and an edge thickness ET1 of the first lens may satisfy: 1.0<ET5 / ET1<3.5.

[0014] In one embodiment, the combined focal length f23 of the second lens and the third lens and the effective focal length f5 of the fifth lens may satisfy: 1.0<f23 / f5<2.0.

[0015] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and an edge thickness ET4 of the fourth lens may satisfy: 1.5<CT4 / ET4<2.0.

[0016] In one embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging system may satisfy the following: 1.0<f12 / f<1.5.

[0017] In one embodiment, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT21 of the object side surface of the second lens, and the maximum effective radius DT51 of the object side surface of the fifth lens may satisfy: 1.5<DT51 / (DT11+DT21)<2.0.

[0018] In one embodiment, a center thickness CT5 of the fifth lens on the optical axis and a center thickness CT3 of the third lens on the optical axis may satisfy: 1.5<CT5 / CT3<3.5.

[0019] On the other hand, the present application provides such an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with negative optical power; a third lens with negative optical power; a fourth lens with optical power; and a fifth lens with optical power. The distance ETL parallel to the optical axis from the object side of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system to the imaging plane of the optical imaging system and the distance EIN parallel to the optical axis from the object side of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system to the image side of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system can satisfy: 1.0<ETL / EIN<1.5.

[0020] In one embodiment, the object-side surface of the fourth lens element may be a convex surface, and the image-side surface may be a concave surface.

[0021] The present application adopts multiple (for example, 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 such as ultra-thinness and good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

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

[0025] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0026] 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;

[0027] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0028] 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;

[0029] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0030] 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;

[0031] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0032] 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;

[0033] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown; and

[0034] 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 shown respectively. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The features, principles and other aspects of the present application are described in detail below.

[0043] The optical imaging system according to the exemplary embodiment of the present application may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The five lenses are arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the fifth lens may have a spacing distance between them.

[0044] In an exemplary embodiment, the first lens may have positive optical power or negative optical power; the second lens may have negative optical power; the third lens may have negative optical power; the fourth lens may have positive optical power or negative optical power, and its object side surface may be convex and its image side surface may be concave; the fifth lens may have positive optical power or negative optical power.

[0045] The second lens has negative focal length, which can make the light diverge outward, so that the system has a larger field of view and can match the main light angle of the high-pixel chip. The third lens has negative focal length, which can adjust the optical magnification, correct the aberration caused by the first two lenses, and further diverge the light, which is conducive to realizing an optical system with a small aperture and a large image surface.

[0046] In an exemplary embodiment, the object side surface of the fourth lens may be convex, and the image side surface may be concave. This convex-concave design of the fourth lens is conducive to better convergence of light by the fourth lens, balance of various aberrations, facilitating mechanism layout, and reducing structural sensitivity.

[0047] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<TTL / ImgH<1.5, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system. More specifically, TTL and ImgH may further satisfy: 1.2<TTL / ImgH<1.5. Satisfying 1.0<TTL / ImgH<1.5 can reduce the total length of the lens as much as possible while ensuring a larger image surface, thereby achieving the purpose of ultra-thinness.

[0048] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 5.5<ΣAT / T34<9.0, wherein ΣAT is the sum of the spacing distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. More specifically, ΣAT and T34 may further satisfy: 5.6<ΣAT / T34<8.9. Satisfying 5.5<ΣAT / T34<9.0 is conducive to balancing the sensitivity of the spacing distance between two adjacent lenses and avoiding excessive concentration of sensitivity. Controlling the spacing distance between the third lens and the fourth lens on the optical axis is conducive to bringing the third lens and the fourth lens closer together, which is convenient for structural layout.

[0049] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -2.0<f / (f2+f4)<-0.5, where f is the total effective focal length of the optical imaging system, f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens. More specifically, f, f2, and f4 may further satisfy: -1.6<f / (f2+f4)<-0.9. Satisfying -2.0<f / (f2+f4)<-0.5 can reduce the deflection angle of light and reduce the sensitivity of the system.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.5<(T12+T45) / T23<3.5, wherein T12 is the spacing distance between the first lens and the second lens on the optical axis, T23 is the spacing distance between the second lens and the third lens on the optical axis, and T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis. More specifically, T12, T45, and T23 may further satisfy: 1.5<(T12+T45) / T23<3.2. Satisfying 1.5<(T12+T45) / T23<3.5 can enable the optical system to have a better ability to balance dispersion, and the proximity of these three spacing distances is conducive to reducing the assembly sensitivity of the system and facilitating assembly production.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.1<f4 / (|R8|+R10)<2.0, wherein f4 is the effective focal length of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and R10 is the radius of curvature of the image side of the fifth lens. More specifically, f4, R8, and R10 may further satisfy: 1.1<f4 / (|R8|+R10)<1.6. Satisfying 1.1<f4 / (|R8|+R10)<2.0 can reduce the off-axis chromatic aberration of the optical system, effectively increase the total effective focal length of the lens, and reasonably allocate the optical power of the fourth lens, which can reduce the sensitivity of actual part processing, thereby improving the production yield of the lens.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 2.0<(|R6|+R3) / (R2+R4)<5.0, wherein R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, and R6 is the radius of curvature of the image side surface of the third lens. More specifically, R6, R3, R2, and R4 may further satisfy: 2.3<(|R6|+R3) / (R2+R4)<4.8. Satisfying 2.0<(|R6|+R3) / (R2+R4)<5.0 can enable the optical system to better match the chief ray angle of the chip, which is beneficial for the optical system to more easily balance field curvature and distortion.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.0<CT4 / T34<6.5, wherein CT4 is the center thickness of the fourth lens on the optical axis, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. Satisfying 3.0<CT4 / T34<6.5 can effectively ensure the processing technology of the third lens and the fourth lens, is more conducive to the molding characteristics of the plastic lens, and is conducive to stable production and assembly.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<ETL / EIN<1.5, wherein ETL is the distance parallel to the optical axis from the object side of the first lens at 1 / 2 entrance pupil diameter of the optical imaging system to the imaging surface of the optical imaging system, and EIN is the distance parallel to the optical axis from the object side of the first lens at 1 / 2 entrance pupil diameter of the optical imaging system to the image side of the fifth lens at 1 / 2 entrance pupil diameter of the optical imaging system. More specifically, ETL and EIN may further satisfy: 1.1<ETL / EIN<1.3. Satisfying 1.0<ETL / EIN<1.5 is conducive to reducing the total length of the optical system, while controlling the main light angle of the optical system, which is conducive to chip matching.

[0055] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<ET5 / ET1<3.5, where ET5 is the edge thickness of the fifth lens and ET1 is the edge thickness of the first lens. More specifically, ET5 and ET1 may further satisfy: 1.1<ET5 / ET1<3.3. Satisfying 1.0<ET5 / ET1<3.5 can ensure that the edge thickness of the lens can meet the actual processing requirements, while being conducive to increasing the relative brightness of the edge field of view and converging the chromatic aberration of the edge field of view.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<f23 / f5<2.0, wherein f23 is the combined focal length of the second lens and the third lens, and f5 is the effective focal length of the fifth lens. More specifically, f23 and f5 may further satisfy: 1.4<f23 / f5<1.9. Satisfying 1.0<f23 / f5<2.0 can effectively reduce the distortion at the edge of the optical system, which is conducive to ensuring the relative brightness of the edge field of view, so that the optical system has a better imaging effect.

[0057] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.5<CT4 / ET4<2.0, wherein CT4 is the center thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens. More specifically, CT4 and ET4 may further satisfy: 1.5<CT4 / ET4<1.9. Satisfying 1.5<CT4 / ET4<2.0 can indirectly control the thickness ratio of the fourth lens, making the fourth lens more in line with molding requirements and avoiding weld marks.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0<f12 / f<1.5, wherein f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging system. More specifically, f12 and f may further satisfy: 1.0<f12 / f<1.3. Satisfying 1.0<f12 / f<1.5 can enable the optical system to have a better ability to balance field curvature, and enable the optical system to have better image quality.

[0059] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.5<DT51 / (DT11+DT21)<2.0, wherein DT11 is the maximum effective radius of the object side of the first lens, DT21 is the maximum effective radius of the object side of the second lens, and DT51 is the maximum effective radius of the object side of the fifth lens. Satisfying 1.5<DT51 / (DT11+DT21)<2.0 is conducive to ensuring that the lens has a longer focal length, appropriately controlling the depth of field range, and is conducive to meeting the shooting needs of more people.

[0060] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.5<CT5 / CT3<3.5, wherein CT5 is the center thickness of the fifth lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT5 and CT3 may further satisfy: 1.6<CT5 / CT3<3.3. Satisfying 1.5<CT5 / CT3<3.5 can make the lens more in line with the process molding requirements and avoid the appearance of weld marks.

[0061] In an exemplary embodiment, the optical imaging system according to the present application further includes an aperture provided between the object side and the first lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0062] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the five lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, etc., the incident light can be effectively converged, the total length of the optical imaging system can be reduced, and the processability of the optical imaging system can be improved, so that the structure of each lens is more compact, the optical imaging system is more conducive to production and processing, and has higher practicality. Through the above configuration, the optical imaging system according to the exemplary embodiment of the present application can have characteristics such as ultra-thinness, small aberrations, and good imaging quality.

[0063] 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 mirror surfaces from the object side of the first lens to the image side of the fifth lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical mirror surfaces.

[0064] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the optical imaging system is not limited to including five lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0065] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0066] Example 1

[0067] 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.

[0068] like Figure 1As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0069] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The 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.

[0070] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0071]

[0072] Table 1

[0073] In this example, the total effective focal length f of the optical imaging system is 3.79 mm, the total length TTL of the optical imaging system (i.e., the distance from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging system on the optical axis) is 4.62 mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the optical imaging system is 3.28 mm, the maximum half field of view Semi-FOV of the optical imaging system is 40.0°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging surface of the optical imaging system is 4.37 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.67 mm.

[0074] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0075]

[0076] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0077] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.8562E-02 7.3677E-02 -3.4351E-01 1.4804E+00 -3.3245E+00 3.4085E+00 1.0575E+00 -5.4088E+00 3.4553E+00 S2 -3.4969E-02 5.5903E-02 -6.1699E-01 4.7674E+00 -2.1678E+01 5.8324E+01 -9.1958E+01 7.9041E+01 -2.9208E+01 S3 -2.8300E-02 4.4629E-02 7.1465E-01 -5.9370E+00 3.0224E+01 -9.7504E+01 1.9165E+02 -2.0751E+02 9.4573E+01 S4 -1.5793E-02 2.4351E-01 -1.4671E+00 1.0254E+01 -4.6154E+01 1.3336E+02 -2.3782E+02 2.3904E+02 -1.0331E+02 S5 -3.2973E-01 2.5669E-01 -1.7842E+00 8.6692E+00 -2.7582E+01 5.4980E+01 -6.5593E+01 4.3556E+01 -1.2608E+01 S6 -3.2986E-01 2.6454E-01 -8.4324E-01 2.5536E+00 -4.9433E+00 6.2869E+00 -4.8082E+00 1.9914E+00 -3.4779E-01 S7 -1.0540E-01 1.2507E-01 -3.4126E-01 9.6942E-01 -1.3744E+00 1.0757E+00 -4.8455E-01 1.1863E-01 -1.2290E-02 S8 -2.3739E-01 3.2929E-01 -3.7793E-01 3.5997E-01 -2.2530E-01 8.7411E-02 -2.0449E-02 2.6567E-03 -1.4776E-04 S9 -2.7847E-01 1.7643E-01 -6.8546E-02 2.0067E-02 -4.3777E-03 6.6776E-04 -6.6047E-05 3.7774E-06 -9.4601E-08 S10 -1.0493E-01 5.8143E-02 -2.3339E-02 6.6077E-03 -1.3135E-03 1.7662E-04 -1.5176E-05 7.5278E-07 -1.6438E-08

[0078] Table 2

[0079] 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.

[0080] Example 2

[0081] 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.

[0082] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0083] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The 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.

[0084] In this example, the total effective focal length f of the optical imaging system is 3.79 mm, the total length TTL of the optical imaging system is 4.59 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane S13 of the optical imaging system is 3.28 mm, the maximum half field of view Semi-FOV of the optical imaging system is 40.0°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging plane of the optical imaging system is 4.34 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.64 mm.

[0085] Table 3 shows the basic parameters of the optical imaging system of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0086]

[0087] Table 3

[0088] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.8350E-02 8.1588E-02 -4.2953E-01 2.0512E+00 -5.6115E+00 9.0788E+00 -7.3953E+00 1.5203E+00 1.0668E+00 S2 -3.7762E-02 9.3387E-02 -1.1119E+00 8.7890E+00 -4.1772E+01 1.2039E+02 -2.0774E+02 1.9851E+02 -8.1752E+01 S3 -3.4596E-02 5.9335E-02 6.8331E-01 -5.9153E+00 3.0855E+01 -1.0141E+02 2.0202E+02 -2.2108E+02 1.0173E+02 S4 -2.1264E-02 2.4845E-01 -1.4349E+00 1.0274E+01 -4.7778E+01 1.4315E+02 -2.6500E+02 2.7626E+02 -1.2354E+02 S5 -2.9515E-01 2.3537E-01 -1.7158E+00 8.8501E+00 -2.9059E+01 5.9712E+01 -7.3747E+01 5.0600E+01 -1.5031E+01 S6 -3.0239E-01 2.3122E-01 -6.8215E-01 2.0597E+00 -3.7466E+00 4.4670E+00 -3.2773E+00 1.3276E+00 -2.3017E-01 S7 -1.2149E-01 1.4538E-01 -4.4869E-01 1.2541E+00 -1.7526E+00 1.3602E+00 -6.0899E-01 1.4838E-01 -1.5315E-02 S8 -2.5476E-01 3.7283E-01 -4.6247E-01 4.5647E-01 -2.9002E-01 1.1340E-01 -2.6631E-02 3.4633E-03 -1.9240E-04 S9 -2.4681E-01 1.3559E-01 -3.9311E-02 7.4854E-03 -9.9595E-04 9.3406E-05 -5.9474E-06 2.3116E-07 -4.1202E-09 S10 -9.2447E-02 4.3305E-02 -1.4172E-02 3.0831E-03 -4.3597E-04 3.6164E-05 -1.2632E-06 -2.1438E-08 2.0140E-09

[0089] Table 4

[0090] 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 4DThe 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.

[0091] Example 3

[0092] 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.

[0093] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0094] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The 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.

[0095] In this example, the total effective focal length f of the optical imaging system is 3.60 mm, the total length TTL of the optical imaging system is 4.24 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane S13 of the optical imaging system is 3.38 mm, the maximum half field of view Semi-FOV of the optical imaging system is 42.3°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging plane of the optical imaging system is 4.00 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.43 mm.

[0096] Table 5 shows the basic parameters of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0097]

[0098] Table 5

[0099] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.5648E-02 1.7821E-01 -1.5898E+00 1.0534E+01 -4.3213E+01 1.1165E+02 -1.7462E+02 1.5048E+02 -5.4436E+01 S2 -6.8652E-02 1.3085E-01 -1.6568E+00 1.3690E+01 -6.9043E+01 2.1137E+02 -3.9122E+02 4.0574E+02 -1.8502E+02 S3 -4.9961E-02 -5.3206E-02 2.9097E+00 -2.4149E+01 1.2361E+02 -4.0049E+02 7.9173E+02 -8.6863E+02 4.0455E+02 S4 -4.6656E-02 4.2545E-01 -3.1236E+00 2.2817E+01 -1.0598E+02 3.1184E+02 -5.6307E+02 5.7098E+02 -2.4871E+02 S5 -3.5582E-01 3.9742E-01 -2.9739E+00 1.5726E+01 -5.4461E+01 1.1814E+02 -1.5347E+02 1.1086E+02 -3.4736E+01 S6 -3.5876E-01 4.5410E-01 -1.8556E+00 6.2015E+00 -1.3717E+01 1.9767E+01 -1.7293E+01 8.3846E+00 -1.7537E+00 S7 -1.4050E-01 2.0987E-01 -4.6610E-01 1.1846E+00 -1.6243E+00 1.2387E+00 -5.4200E-01 1.2848E-01 -1.2868E-02 S8 -3.3061E-01 5.9804E-01 -9.2921E-01 1.1542E+00 -9.1299E-01 4.4132E-01 -1.2769E-01 2.0443E-02 -1.3994E-03 S9 -3.2467E-01 2.2205E-01 -9.3137E-02 2.7402E-02 -5.5946E-03 7.6708E-04 -6.7075E-05 3.3758E-06 -7.4438E-08 S10 -1.2747E-01 7.8349E-02 -3.4325E-02 1.0628E-02 -2.3049E-03 3.3478E-04 -3.0611E-05 1.5861E-06 -3.5475E-08

[0100] Table 6

[0101] 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.

[0102] Example 4

[0103] 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.

[0104] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0105] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has 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 concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The 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.

[0106] In this example, the total effective focal length f of the optical imaging system is 3.86 mm, the total length TTL of the optical imaging system is 4.60 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane S13 of the optical imaging system is 3.38 mm, the maximum half field of view Semi-FOV of the optical imaging system is 40.3°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging plane of the optical imaging system is 4.34 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.52 mm.

[0107] Table 7 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0108]

[0109] Table 7

[0110] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.7338E-02 8.5019E-02 -5.2591E-01 3.0417E+00 -1.0902E+01 2.5014E+01 -3.4789E+01 2.6651E+01 -8.4972E+00 S2 -4.1795E-02 4.9969E-02 -2.7055E-01 1.8164E+00 -6.9222E+00 1.4227E+01 -1.3441E+01 1.9472E+00 3.5296E+00 S3 -6.4154E-02 1.4886E-01 -2.1928E-01 1.7353E+00 -8.4730E+00 2.1902E+01 -2.9963E+01 1.9298E+01 -3.7244E+00 S4 -5.9532E-02 2.2118E-01 -5.3412E-01 2.6838E+00 -8.9760E+00 1.8895E+01 -2.3701E+01 1.6590E+01 -4.9659E+00 S5 -3.1049E-01 7.9269E-02 -1.1228E+00 6.4698E+00 -2.1312E+01 4.1548E+01 -4.6345E+01 2.7690E+01 -6.9887E+00 S6 -2.8402E-01 8.1524E-02 -5.0381E-01 2.3135E+00 -5.6832E+00 8.4323E+00 -7.1681E+00 3.2298E+00 -6.0533E-01 S7 -6.9039E-02 3.7227E-02 -1.0997E-01 3.6665E-01 -4.6128E-01 2.9885E-01 -1.0848E-01 2.1100E-02 -1.7217E-03 S8 -1.9218E-01 2.5136E-01 -2.7968E-01 2.6598E-01 -1.6092E-01 5.8786E-02 -1.2744E-02 1.5189E-03 -7.6971E-05 S9 -3.0808E-01 2.1550E-01 -9.3558E-02 2.8736E-02 -6.1432E-03 8.8223E-04 -8.0790E-05 4.2585E-06 -9.8375E-08 S10 -1.2682E-01 7.5782E-02 -3.2864E-02 9.9858E-03 -2.1376E-03 3.1319E-04 -2.9765E-05 1.6493E-06 -4.0254E-08

[0111] Table 8

[0112] 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.8DThe 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.

[0113] Example 5

[0114] The following reference Figures 9 to 10D An optical imaging system according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging system according to Example 5 of the present application is shown.

[0115] like Fig. 9 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0116] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter 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.

[0117] In this example, the total effective focal length f of the optical imaging system is 3.82 mm, the total length TTL of the optical imaging system is 4.65 mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the optical imaging system is 3.28 mm, the maximum half field of view Semi-FOV of the optical imaging system is 39.8°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging surface of the optical imaging system is 4.41 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.63 mm.

[0118] Table 9 shows the basic parameter table of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0119]

[0120] Table 9

[0121] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.4144E-02 1.0370E-01 -7.4757E-01 4.4791E+00 -1.6492E+01 3.8411E+01 -5.4139E+01 4.2123E+01 -1.3753E+01 S2 -4.5268E-02 7.4807E-02 -7.1602E-01 5.6451E+00 -2.6045E+01 7.1538E+01 -1.1529E+02 1.0087E+02 -3.7033E+01 S3 -6.6831E-02 1.6263E-01 -6.5451E-01 5.3163E+00 -2.5338E+01 6.9999E+01 -1.1207E+02 9.6485E+01 -3.4528E+01 S4 -7.1419E-02 3.2049E-01 -1.6251E+00 9.3303E+00 -3.3697E+01 7.5523E+01 -1.0154E+02 7.4932E+01 -2.3205E+01 S5 -3.1093E-01 1.3082E-01 -5.9200E-01 2.8795E+00 -8.7865E+00 1.5777E+01 -1.5848E+01 8.4207E+00 -1.8930E+00 S6 -3.0494E-01 1.3556E-01 -2.3552E-01 7.8402E-01 -1.7256E+00 2.2880E+00 -1.6278E+00 5.7234E-01 -7.8544E-02 S7 -5.3419E-02 -8.9458E-03 3.7463E-02 2.0358E-02 -5.1279E-02 3.2599E-02 -1.0232E-02 1.6414E-03 -1.0790E-04 S8 -1.2659E-01 1.3569E-01 -1.3160E-01 1.1483E-01 -6.1779E-02 1.9614E-02 -3.6480E-03 3.7002E-04 -1.5867E-05 S9 -3.4653E-01 2.3347E-01 -9.4258E-02 2.6598E-02 -5.2527E-03 7.0416E-04 -6.0749E-05 3.0365E-06 -6.6798E-08 S10 -1.4129E-01 8.6601E-02 -3.6876E-02 1.0905E-02 -2.2454E-03 3.1344E-04 -2.8183E-05 1.4699E-06 -3.3661E-08

[0122] Table 10

[0123] 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.

[0124] Example 6

[0125] 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.

[0126] like Fig.11 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0127] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is 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.

[0128] In this example, the total effective focal length f of the optical imaging system is 3.77 mm, the total length TTL of the optical imaging system is 4.35 mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the optical imaging system is 3.28 mm, the maximum half field of view Semi-FOV of the optical imaging system is 40.3°, the aperture value Fno of the optical imaging system is 2.48, the distance ETL parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the imaging surface of the optical imaging system is 4.11 mm, and the distance EIN parallel to the optical axis between the object side surface of the first lens at 1 / 2 of the entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at 1 / 2 of the entrance pupil diameter of the optical imaging system is 3.33 mm.

[0129] Table 11 shows the basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0130]

[0131] Table 11

[0132] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.1705E-02 2.6105E-01 -2.5347E+00 1.5082E+01 -5.6484E+01 1.3342E+02 -1.9345E+02 1.5712E+02 -5.4835E+01 S2 -1.7549E-01 -6.8707E-01 1.4038E+01 -9.4934E+01 3.5697E+02 -8.2221E+02 1.1595E+03 -9.2751E+02 3.2422E+02 S3 -1.0686E-01 -5.1282E-01 1.2525E+01 -8.2055E+01 2.9439E+02 -6.3993E+02 8.4618E+02 -6.3396E+02 2.0853E+02 S4 -6.9893E-02 1.2900E+00 -1.2622E+01 8.8669E+01 -3.8810E+02 1.0457E+03 -1.6824E+03 1.4823E+03 -5.5045E+02 S5 -3.5217E-01 1.4603E+00 -1.4011E+01 9.1055E+01 -3.6834E+02 9.2077E+02 -1.3869E+03 1.1561E+03 -4.1004E+02 S6 -3.1329E-01 2.2143E-01 4.6401E-01 -2.5032E+00 7.1749E+00 -1.3147E+01 1.4328E+01 -8.2274E+00 1.8973E+00 S7 -2.0362E-01 -1.9648E-01 1.5122E+00 -3.3972E+00 6.0160E+00 -8.0948E+00 6.8062E+00 -3.0760E+00 5.6837E-01 S8 -4.6012E-01 8.7619E-01 -1.4785E+00 1.9112E+00 -1.5031E+00 6.8157E-01 -1.6809E-01 1.8730E-02 -4.0577E-04 S9 -3.8657E-01 3.3067E-01 -1.8184E-01 7.3149E-02 -2.0533E-02 3.8217E-03 -4.4649E-04 2.9599E-05 -8.4896E-07 S10 -1.6221E-01 1.0956E-01 -5.1806E-02 1.6331E-02 -3.3915E-03 4.4123E-04 -3.2219E-05 9.9463E-07 7.6927E-10

[0133] Table 12

[0134] 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.12DThe 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. 12D It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0135] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0136] Conditional / Example 1 2 3 4 5 6 TTL / ImgH 1.41 1.40 1.25 1.36 1.42 1.32 ΣAL / T34 8.49 8.09 8.81 5.64 5.72 7.62 f / (f2+f4) -1.33 -1.52 -1.44 -1.43 -0.97 -1.03 (T12+T45) / T23 1.69 1.82 3.15 1.62 1.56 2.61 f4 / (|R8|+R10) 1.29 1.36 1.58 1.40 1.15 1.30 (|R6|+R3) / (R2+R4) 2.40 3.24 3.33 4.76 2.65 3.47 CT4 / T34 6.45 5.51 3.18 3.26 3.60 3.83 ETL / EIN 1.19 1.19 1.17 1.23 1.21 1.23 ET5 / ET1 3.28 2.96 2.32 1.83 2.44 1.16 f23 / f5 1.54 1.45 1.73 1.84 1.84 1.76 CT4 / ET4 1.55 1.63 1.80 1.66 1.81 1.75 f12 / f 1.13 1.12 1.21 1.18 1.26 1.01 DT51 / (DT11+DT21) 1.67 1.79 1.95 1.78 1.64 1.56 CT5 / CT3 3.29 2.84 1.93 2.60 2.14 1.61

[0137] Table 13

[0138] 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.

[0139] 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 (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging system, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, and its object side surface is convex and its image side surface is concave; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a third lens having negative optical power; a fourth lens element having positive refractive power and a convex image-side surface; and a fifth lens element having negative optical power, whose image side surface is concave; The number of lenses having optical power in the optical imaging system is five; The distance TTL from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfy the following conditions: 1.25≤TTL / ImgH≤1.42; The sum of the distances ΣAT between any two adjacent lenses from the first lens to the fifth lens on the optical axis and the distance T34 between the third lens and the fourth lens on the optical axis satisfy: 5.6<ΣAT / T34≤8.81; A curvature radius R2 of the image side surface of the first lens, a curvature radius R3 of the object side surface of the second lens, a curvature radius R4 of the image side surface of the second lens, and a curvature radius R6 of the image side surface of the third lens satisfy: 2.40≤(|R6|+R3) / (R2+R4)<4.

8.

2. The optical imaging system according to claim 1, characterized in that: The total effective focal length f of the optical imaging system, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy: -1.52≤f / (f2+f4)≤-0.

97.

3. The optical imaging system according to claim 1, characterized in that: A distance T12 between the first lens and the second lens on the optical axis, a distance T23 between the second lens and the third lens on the optical axis, and a distance T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.56≤(T12+T45) / T23≤3.

15.

4. The optical imaging system according to claim 1, characterized in that: The effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R10 of the image side surface of the fifth lens satisfy: 1.15≤f4 / (|R8|+R10)<1.

6.

5. The optical imaging system according to claim 1, characterized in that: A center thickness CT4 of the fourth lens on the optical axis and a spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 3.18≤CT4 / T34≤6.

45.

6. The optical imaging system according to claim 1, characterized in that: 1.17≤ETL / EIN≤1.23, wherein ETL is a distance between the object side surface of the first lens at a position of 1 / 2 entrance pupil diameter of the optical imaging system and the imaging plane of the optical imaging system parallel to the optical axis, and EIN is a distance between the object side surface of the first lens at a position of 1 / 2 entrance pupil diameter of the optical imaging system and the image side surface of the fifth lens at a position of 1 / 2 entrance pupil diameter of the optical imaging system parallel to the optical axis.

7. The optical imaging system according to claim 1, characterized in that: The edge thickness ET5 of the fifth lens and the edge thickness ET1 of the first lens satisfy: 1.16≤ET5 / ET1<3.

3.

8. The optical imaging system according to claim 1, characterized in that: A combined focal length f23 of the second lens and the third lens and an effective focal length f5 of the fifth lens satisfy: 1.45≤f23 / f5≤1.

84.

9. The optical imaging system according to claim 1, characterized in that: A center thickness CT4 of the fourth lens on the optical axis and an edge thickness ET4 of the fourth lens satisfy: 1.55≤CT4 / ET4≤1.

81.

10. The optical imaging system according to claim 1, characterized in that: The combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging system satisfy the following: 1.0<f12 / f<1.

3.

11. The optical imaging system according to claim 1, characterized in that: The maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT21 of the object-side surface of the second lens, and the maximum effective radius DT51 of the object-side surface of the fifth lens satisfy: 1.56≤DT51 / (DT11+DT21)≤1.

95.

12. The optical imaging system according to claim 1, characterized in that: A center thickness CT5 of the fifth lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 1.6<CT5 / CT3<3.3.

Images