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 optical power; a third lens with positive optical power; a fourth lens with optical power; and a fifth lens with optical power. Wherein, half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 0.5<ImgH / EPD≤1.0.

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] In recent years, the development of imaging technology in portable electronic products such as somatosensory gaming devices and new smartphones has brought TOF (Time of Flight) lenses into the public eye. Industrial-grade laser radars used in the military and driverless cars have also adopted TOF technology.

[0003] TOF is a depth information measurement solution, mainly composed of an infrared light projector and a receiving module. Compared with other three-dimensional measurement technologies, TOF lenses are small and lightweight, and TOF depth calculation is not affected by the grayscale and features of the object surface, and has strong anti-interference ability. TOF lenses have unique advantages in face recognition, stereo imaging, somatosensory interaction, etc.

[0004] How to achieve a high-pixel, small-size, lightweight imaging system that can be applied to TOF technology while ensuring the imaging quality of the lens is one of the urgent problems that lens manufacturers need to solve. Summary of the invention

[0005] On the one hand, the present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with optical focal length; a second lens with optical focal length; a third lens with positive optical focal length; a fourth lens with optical focal length; and a fifth lens with optical focal length.

[0006] In one embodiment, the entrance pupil diameter EPD of the optical imaging system and the center thickness CT2 of the second lens may satisfy: 5.0<EPD / CT2<8.0.

[0007] In one embodiment, a center thickness CT4 of the fourth lens, a center thickness CT5 of the fifth lens, and a spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 0.5<(T34+CT4) / CT5<1.5.

[0008] In one embodiment, the entrance pupil diameter EPD of the optical imaging system and half the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system may satisfy: 0.5<ImgH / EPD≤1.0.

[0009] In one embodiment, the total effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system, and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis may satisfy: 1.5mm<f / TTL×EPD≤3.0mm.

[0010] In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens may satisfy: f3 / f<2.5. Optionally, 0.85<f3 / f<2.5.

[0011] In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens may satisfy: f / |f4|≤0.3.

[0012] In one embodiment, 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: f / R7+f / R8<-4.5.

[0013] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens may satisfy: 0.5<R2 / R1<2.5.

[0014] In one embodiment, the total effective focal length f of the optical imaging system, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens may satisfy: f / R3+f / R4>2.5. Optionally, 2.5<f / R3+f / R4<5.0.

[0015] In one embodiment, the total effective focal length f of the optical imaging system, the spacing distance T12 between the first lens and the second lens on the optical axis, and the spacing distance T23 between the second lens and the third lens on the optical axis may satisfy: 3.0<f / (T12+T23)<5.0.

[0016] In one embodiment, the center thickness CT1 of the first lens and the center thickness CT2 of the second lens may satisfy: 0.5<CT2 / CT1<1.5.

[0017] In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT42 of the image-side surface of the fourth lens may satisfy: 0.8≤DT11 / DT42≤1.2.

[0018] In one embodiment, the distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the third lens on the optical axis, the distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 1.0≤(|SAG32|+T34) / |SAG41|<2.5.

[0019] In one embodiment, a distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens on the optical axis and a spacing distance ET45 between the fourth lens and the fifth lens at the maximum effective radius may satisfy: -1.0≤SAG42 / ET45≤-0.5.

[0020] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens may satisfy: 0.5<R7 / R8<1.0.

[0021] 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 satisfy: f / EPD<1.3.

[0022] The optical imaging system configured as above can have characteristics such as miniaturization, high imaging quality, good processing consistency, and applicability to the infrared band, so that it can be applicable to the field of TOF technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown; FIG. 2A to FIG. 2C The astigmatism curve, distortion curve and relative illumination 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; FIG. 4A to FIG. 4C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 2 are respectively shown;

[0026] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown; FIG. 6A to FIG. 6C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 3 are respectively shown;

[0027] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown; FIG. 8A to FIG. 8C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 4 are respectively shown;

[0028] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown; FIG. 10A to FIG. 10CThe astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 5 are respectively shown;

[0029] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown; FIG. 12A to FIG. 12C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 6 are respectively shown;

[0030] Fig.13 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown; FIG. 14A to FIG. 14C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 7 are respectively shown;

[0031] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown; FIG. 16A to FIG. 16C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 8 are respectively shown;

[0032] Fig.17 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown; 18A to 18C The astigmatism curve, distortion curve and relative illumination curve of the optical imaging system of Example 9 are shown respectively. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The features, principles and other aspects of the present application are described in detail below.

[0041] 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.

[0042] In an exemplary embodiment, the first lens has positive or negative optical power; the second lens has positive or negative optical power; the third lens may have positive optical power; the fourth lens has positive or negative optical power; and the fifth lens has positive or negative optical power.

[0043] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 5.0<EPD / CT2<8.0, wherein EPD is the entrance pupil diameter of the optical imaging system, and CT2 is the center thickness of the second lens. More specifically, EPD and CT2 may further satisfy: 5.3<EPD / CT2<7.6. Satisfying 5.0<EPD / CT2<8.0 can improve the processability of the optical imaging system while ensuring good imaging quality.

[0044] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<(T34+CT4) / CT5<1.5, wherein CT4 is the center thickness of the fourth lens, CT5 is the center thickness of the fifth lens, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. More specifically, T34, CT4, and CT5 may further satisfy: 0.6<(T34+CT4) / CT5<1.5. Satisfying 0.5<(T34+CT4) / CT5<1.5 is conducive to improving the stability of lens assembly and the consistency of mass production, and is conducive to improving the production rate of the optical imaging system.

[0045] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<ImgH / EPD≤1.0, wherein EPD is the entrance pupil diameter of the optical imaging system, and ImgH is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system. More specifically, ImgH and EPD may further satisfy: 0.6<ImgH / EPD≤1.0. Satisfying 0.5<ImgH / EPD≤1.0 can enable the optical imaging system to have a better ability to balance aberrations.

[0046] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.5mm<f / TTL×EPD≤3.0mm, wherein f is the total effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging system, and 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. More specifically, f, EPD, and TTL may further satisfy: 1.7mm<f / TTL×EPD≤3.0mm. Satisfying 1.5mm<f / TTL×EPD≤3.0mm can ensure the light throughput and relative illumination of the optical imaging system.

[0047] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f3 / f<2.5, where f is the total effective focal length of the optical imaging system, and f3 is the effective focal length of the third lens. More specifically, f3 and f may further satisfy: 0.85<f3 / f<2.5. Satisfying f3 / f<2.5 is conducive to improving the field of view of the optical imaging system.

[0048] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f / |f4|≤0.3, where f is the total effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens. Satisfying f / |f4|≤0.3 can effectively reduce the optical sensitivity of the fourth lens, which is more conducive to mass production.

[0049] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f / R7+f / R8<-4.5, 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: -7.5<f / R7+f / R8<-5.0. Satisfying f / R7+f / R8<-4.5 can reduce the distortion value of the optical imaging system and ensure that the optical imaging system has good imaging quality.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<R2 / R1<2.5, 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, R2 and R1 may further satisfy: 0.6<R2 / R1<2.2. Satisfying 0.5<R2 / R1<2.5 can not only help reduce the sensitivity of the system, realize the characteristics of a large field of view, a large aperture, and high resolution of the imaging system, but also ensure that the first lens has good processability.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f / R3+f / R4>2.5, wherein f is the total effective focal length of the optical imaging system, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens. More specifically, f, R3, and R4 may further satisfy: 2.5<f / R3+f / R4<5.0, for example, 2.7<f / R3+f / R4<4.0. Satisfying f / R3+f / R4>2.5 can reduce the distortion value of the optical imaging system and ensure that the optical imaging system has good imaging quality.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.0<f / (T12+T23)<5.0, wherein f is the total effective focal length of the optical imaging system, T12 is the spacing distance between the first lens and the second lens on the optical axis, and T23 is the spacing distance between the second lens and the third lens on the optical axis. More specifically, f, T12, and T23 may further satisfy: 3.2<f / (T12+T23)<4.5. Satisfying 3.0<f / (T12+T23)<5.0 can ensure that the optical imaging system has good processability characteristics.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<CT2 / CT1<1.5, wherein CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens. More specifically, CT2 and CT1 may further satisfy: 0.5<CT2 / CT1<1.4. Satisfying 0.5<CT2 / CT1<1.5 can not only make the lens easy to be injection molded, improve the processability of the optical imaging system, but also ensure that the optical imaging system has good imaging quality.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.8≤DT11 / DT42≤1.2, where DT11 is the maximum effective radius of the object side of the first lens, and DT42 is the maximum effective radius of the image side of the fourth lens. Satisfying 0.8≤DT11 / DT42≤1.2 can improve the ability of the optical imaging system to correct off-axis aberrations, so that the system can obtain higher imaging quality.

[0055] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0≤(|SAG32|+T34) / |SAG41|<2.5, wherein SAG32 is the distance from the intersection of the image side surface of the third lens and the optical axis to the maximum effective radius vertex of the image side surface of the third lens on the optical axis, SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the object side surface 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. More specifically, SAG32, T34 and SAG41 may further satisfy: 1.0≤(|SAG32|+T34) / |SAG41|<2.4. Satisfying 1.0≤(|SAG32|+T34) / |SAG41|<2.5 can make the lens surface more free to change, thereby enabling the optical imaging system to obtain a stronger ability to correct astigmatism and field curvature.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -1.0≤SAG42 / ET45≤-0.5, wherein SAG42 is the distance from the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens on the optical axis, and ET45 is the spacing distance between the fourth lens and the fifth lens at the maximum effective radius. Satisfying -1.0≤SAG42 / ET45≤-0.5 can effectively adjust the chief ray angle of the system, thereby improving the imaging quality.

[0057] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.5<R7 / R8<1.0, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. More specifically, R7 and R8 may further satisfy: 0.6<R7 / R8<1.0. Satisfying 0.5<R7 / R8<1.0 can not only help reduce the sensitivity of the system, realize the characteristics of a large field of view, a large aperture, and high resolution of the imaging system, but also ensure that the fourth lens has good processability.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f / EPD<1.3, where f is the total effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system. More specifically, f and EPD may further satisfy: f / EPD<1.2. Satisfying f / EPD<1.3 can effectively improve the energy density of the imaging surface and improve the signal-to-noise ratio of the image sensor output signal, that is, the accuracy of infrared measurement.

[0059] In an exemplary embodiment, the optical imaging system according to the present application further includes an aperture disposed between the first lens and the second 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.

[0060] 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 can be applied to portable electronic devices. The optical imaging system configured as above can have characteristics such as large aperture and miniaturization, and can be applied to infrared bands and TOF technology fields.

[0061] 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.

[0062] 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.

[0063] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0064] Example 1

[0065] The following reference Figures 1 to 2C An optical imaging system according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0066] like Figure 1 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0067] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is 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 negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive 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.

[0068] 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).

[0069]

[0070] Table 1

[0071] In this example, the total effective focal length f of the optical imaging system is 4.46 mm, the maximum field of view FOV of the optical imaging system is 32.5°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[0072] 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:

[0073]

[0074] 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 .

[0075] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.1168E-03 3.3740E-04 2.8440E-04 -2.1195E-04 4.1465E-05 -3.9860E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.6220E-02 3.4060E-03 -9.7622E-04 1.2158E-04 -8.2001E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.1992E-02 -5.4950E-02 3.1673E-02 -1.6078E-02 6.2959E-03 -1.6593E-03 2.6031E-04 -1.8368E-05 0.0000E+00 S4 -1.9097E-02 -7.1019E-03 -7.0904E-03 7.2856E-03 -3.6044E-03 1.0313E-03 -1.4852E-04 4.8645E-06 6.2952E-07 S5 -2.7537E-02 8.4030E-03 -2.8585E-02 3.0589E-02 -2.1035E-02 8.2694E-03 -1.6439E-03 1.2804E-04 0.0000E+00 S6 -2.6367E-02 7.0696E-03 -1.6918E-02 1.8043E-02 -1.1804E-02 4.8260E-03 -1.1346E-03 1.3809E-04 -6.7212E-06 S7 1.5854E-01 -1.7083E-01 1.2763E-01 -6.4227E-02 2.2641E-02 -5.2112E-03 6.9770E-04 -4.5636E-05 9.3328E-07 S8 3.2381E-02 1.5469E-02 -4.2799E-02 3.9575E-02 -1.9875E-02 6.1096E-03 -1.1610E-03 1.2500E-04 -5.7634E-06 S9 -6.1501E-03 -1.5633E-03 -8.9398E-04 7.1611E-04 -2.1847E-04 4.0141E-05 -4.4438E-06 2.6802E-07 -6.7271E-09 S10 -9.7926E-02 5.1276E-02 -2.3467E-02 7.7303E-03 -1.7400E-03 2.5951E-04 -2.4467E-05 1.3178E-06 -3.0814E-08

[0076] Table 2

[0077] Figure 2AAn astigmatism curve of the optical imaging system of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2B 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 2C The relative illumination curve of the optical imaging system of Example 1 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 2A to FIG. 2C It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0078] Example 2

[0079] The following reference Figures 3 to 4C 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.

[0080] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0081] The first lens E1 has negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive optical 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.

[0082] In this example, the total effective focal length f of the optical imaging system is 3.48 mm, the maximum field of view FOV of the optical imaging system is 39.5°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[0083] 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.

[0084]

[0085] Table 3

[0086] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -9.8114E-03 6.6136E-03 2.5192E-04 -2.2969E-03 9.1960E-04 -1.3084E-04 0.0000E+00 0.0000E+00 0.0000E+00 S2 -6.0292E-02 3.8381E-02 -1.7302E-02 4.0810E-03 -4.4652E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.5102E-01 -3.2121E-01 3.8911E-01 -3.3146E-01 1.8807E-01 -6.7210E-02 1.3586E-02 -1.1813E-03 0.0000E+00 S4 -3.9449E-02 -1.3948E-02 -5.1683E-02 1.0523E-01 -1.0509E-01 6.1265E-02 -2.0944E-02 3.8713E-03 -2.9706E-04 S5 -4.2317E-02 -5.9254E-03 -1.2018E-02 6.1814E-03 -6.0760E-03 6.4648E-03 -2.7005E-03 3.7449E-04 0.0000E+00 S6 -2.9254E-02 -3.5399E-02 5.9061E-02 -6.4675E-02 4.8825E-02 -2.2047E-02 5.6441E-03 -7.6196E-04 4.2387E-05 S7 2.0793E-01 -2.6839E-01 2.5680E-01 -1.5081E-01 6.1706E-02 -1.8035E-02 3.4601E-03 -3.7436E-04 1.6880E-05 S8 7.6010E-02 -7.7898E-02 8.1621E-02 -5.3325E-02 2.4937E-02 -8.3629E-03 1.8636E-03 -2.4336E-04 1.4129E-05 S9 -6.4525E-02 3.1556E-02 -1.4745E-02 4.3228E-03 -8.3049E-04 1.0493E-04 -7.8972E-06 2.9118E-07 -3.1314E-09 S10 -1.0023E-01 5.2470E-02 -2.4017E-02 7.8222E-03 -1.7414E-03 2.5667E-04 -2.3918E-05 1.2727E-06 -2.9342E-08

[0087] Table 4

[0088] Figure 4A 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 4B 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 4C The relative illumination curve of the optical imaging system of Example 2 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 4A to FIG. 4C It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0089] Example 3

[0090] The following reference Figures 5 to 6C An optical imaging system according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown.

[0091] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0092] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is 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 negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive 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.

[0093] In this example, the total effective focal length f of the optical imaging system is 3.45 mm, the maximum field of view FOV of the optical imaging system is 40.6°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[0094] 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.

[0095]

[0096] Table 5

[0097]

[0098]

[0099] Table 6

[0100] Fig. 6A An astigmatism curve of the optical imaging system of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6B The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6C The relative illumination curve of the optical imaging system of Example 3 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 6A to FIG. 6C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0101] Example 4

[0102] The following reference Figures 7 to 8C An optical imaging system according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown.

[0103] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0104] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is 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 negative 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.

[0105] In this example, the total effective focal length f of the optical imaging system is 4.72 mm, the maximum field of view FOV of the optical imaging system is 31.4°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.10.

[0106] 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.

[0107]

[0108]

[0109] Table 7

[0110] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.8300E-03 3.9296E-04 -3.7339E-04 1.0651E-04 -2.2437E-05 1.3216E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -7.2538E-03 -1.7920E-03 3.5457E-04 -7.3994E-05 6.4514E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.6732E-02 -6.6156E-02 4.3710E-02 -2.4313E-02 9.4852E-03 -2.3110E-03 3.1559E-04 -1.8760E-05 0.0000E+00 S4 -1.8931E-02 -1.2250E-02 2.3051E-03 -1.3337E-03 4.6909E-04 1.0965E-04 -1.1075E-04 2.5390E-05 -1.9383E-06 S5 -2.0450E-02 2.8362E-02 -5.9732E-02 5.4588E-02 -2.9799E-02 9.0650E-03 -1.4054E-03 8.6929E-05 0.0000E+00 S6 3.1584E-02 -6.0234E-02 6.4129E-02 -5.2025E-02 2.6573E-02 -8.2964E-03 1.5416E-03 -1.5613E-04 6.6077E-06 S7 1.5361E-01 -1.6293E-01 1.1982E-01 -5.9354E-02 2.0595E-02 -4.6661E-03 6.1494E-04 -3.9593E-05 7.9702E-07 S8 1.3183E-01 -1.3914E-01 1.1425E-01 -7.0080E-02 3.3392E-02 -1.1451E-02 2.5455E-03 -3.2132E-04 1.7373E-05 S9 -3.3533E-03 -3.2256E-02 1.7594E-02 -5.0780E-03 9.6213E-04 -1.1995E-04 9.3086E-06 -4.0346E-07 7.4161E-09 S10 -9.5186E-03 -8.9574E-03 3.6168E-03 -7.0261E-04 7.6863E-05 -4.9594E-06 1.8699E-07 -3.8081E-09 3.2346E-11

[0111] Table 8

[0112] Fig. 8A An astigmatism curve of the optical imaging system of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8B The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8C The relative illumination curve of the optical imaging system of Example 4 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 8A to FIG. 8C 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 10C An optical imaging system according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging system according to Example 5 of the present application is shown.

[0115] like Fig. 9 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, 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 positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive 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 3.46 mm, the maximum field of view FOV of the optical imaging system is 39.2°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.12.

[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 3.2366E-03 -4.9352E-03 5.9036E-03 -4.3624E-03 1.3872E-03 -1.8762E-04 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.4942E-02 6.0576E-03 -2.7588E-03 4.2321E-04 -7.4232E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 6.1862E-02 -1.2063E-01 9.7444E-02 -5.4053E-02 1.5949E-02 -6.0184E-04 -9.2419E-04 1.6302E-04 0.0000E+00 S4 -5.9602E-02 -8.1883E-04 -1.0067E-02 4.0904E-03 2.8189E-03 -4.2747E-03 1.8168E-03 -3.2665E-04 2.2301E-05 S5 -3.4503E-02 1.7260E-02 -5.7776E-02 6.7559E-02 -5.1313E-02 2.1496E-02 -4.4237E-03 3.5165E-04 0.0000E+00 S6 -1.6898E-02 -3.5587E-02 2.5355E-02 -5.7326E-03 -6.4011E-03 6.7245E-03 -2.5784E-03 4.4888E-04 -2.9756E-05 S7 2.2561E-01 -3.1770E-01 3.1017E-01 -2.0397E-01 9.3961E-02 -2.8261E-02 4.9446E-03 -4.2265E-04 1.1295E-05 S8 5.7568E-02 -5.2783E-02 4.4861E-02 -2.0593E-02 4.9473E-03 -1.4908E-04 -2.5274E-04 5.9941E-05 -4.1719E-06 S9 -2.5803E-02 9.6335E-03 -7.6205E-03 3.2112E-03 -8.6178E-04 1.4342E-04 -1.3017E-05 4.9601E-07 -1.0730E-09 S10 -9.4584E-02 4.6252E-02 -2.1156E-02 6.9440E-03 -1.5424E-03 2.2256E-04 -1.9914E-05 1.0048E-06 -2.1885E-08

[0122] Table 10

[0123] Fig. 10A An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 10B 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. 10C The relative illumination curve of the optical imaging system of Example 5 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 10A to FIG. 10C 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 12C An optical imaging system according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging system according to Example 6 of the present application is shown.

[0126] like Fig.11 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, 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 positive focal power, and its object side surface S3 is convex, 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 negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive 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.

[0128] In this example, the total effective focal length f of the optical imaging system is 4.23 mm, the maximum field of view FOV of the optical imaging system is 33.1°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[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]

[0133]

[0134] Table 12

[0135] Fig. 12A An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 12B 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. 12C The relative illumination curve of the optical imaging system of Example 6 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 12A to FIG. 12C It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0136] Example 7

[0137] The following reference Figures 13 to 14C 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.

[0138] like Fig.13 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0139] The first lens E1 has positive optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive optical 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.

[0140] In this example, the total effective focal length f of the optical imaging system is 3.41 mm, the maximum field of view FOV of the optical imaging system is 39.1°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[0141] Table 13 shows the basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness / distance 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 each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0142]

[0143]

[0144] Table 13

[0145] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.4613E-03 -1.6420E-03 6.0272E-03 -5.4214E-03 1.8742E-03 -2.5895E-04 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.4585E-02 1.3326E-02 -6.8073E-03 1.7932E-03 -2.6699E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 9.7851E-02 -1.9451E-01 1.9483E-01 -1.5626E-01 9.0621E-02 -3.5215E-02 8.0871E-03 -8.3329E-04 0.0000E+00 S4 -5.3008E-02 1.2296E-02 -8.1594E-02 1.0500E-01 -7.5144E-02 3.0345E-02 -6.3545E-03 5.0164E-04 1.0328E-05 S5 -4.4861E-02 -2.6632E-02 4.0258E-02 -8.0469E-02 6.6197E-02 -2.5408E-02 4.6159E-03 -3.1700E-04 0.0000E+00 S6 -2.7303E-02 -6.5812E-02 1.2920E-01 -1.6136E-01 1.2267E-01 -5.4072E-02 1.3542E-02 -1.7932E-03 9.7418E-05 S7 2.5486E-01 -3.5249E-01 3.6629E-01 -2.4719E-01 1.2005E-01 -4.1612E-02 9.2971E-03 -1.1542E-03 5.9311E-05 S8 6.9125E-02 -4.3718E-02 2.0321E-02 6.6322E-03 -1.1294E-02 6.1939E-03 -2.0148E-03 3.6834E-04 -2.7795E-05 S9 -1.1932E-01 9.4479E-02 -6.6964E-02 3.2376E-02 -1.0550E-02 2.2385E-03 -2.9201E-04 2.1165E-05 -6.5180E-07 S10 -1.2949E-01 8.7591E-02 -4.8776E-02 1.8942E-02 -4.9485E-03 8.4375E-04 -8.9744E-05 5.4013E-06 -1.4038E-07

[0146] Table 14

[0147] Fig.14A An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 14BThe distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig. 14C The relative illumination curve of the optical imaging system of Example 7 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 14A to FIG. 14C It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0148] Example 8

[0149] The following reference Figures 15 to 16C An optical imaging system according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical imaging system according to Example 8 of the present application is shown.

[0150] like Fig.15 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, 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 concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, 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 negative 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.

[0152] In this example, the total effective focal length f of the optical imaging system is 3.52 mm, the maximum field of view FOV of the optical imaging system is 39.2°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.11.

[0153] Table 15 shows the basic parameter table of the optical imaging system of Example 8, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 16 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 8, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0154]

[0155] Table 15

[0156] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -7.5713E-04 -7.7955E-04 3.8350E-03 -3.2947E-03 1.0908E-03 -1.4691E-04 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.4987E-02 1.4008E-02 -5.7753E-03 1.3383E-03 -1.8418E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 8.5478E-02 -1.5698E-01 1.4860E-01 -1.2007E-01 7.4943E-02 -3.1945E-02 7.9425E-03 -8.6400E-04 0.0000E+00 S4 -4.0448E-02 -1.3058E-02 -2.1118E-02 2.7233E-02 -1.4706E-02 2.5223E-03 8.3761E-04 -4.1234E-04 4.7582E-05 S5 -4.1784E-02 4.8021E-02 -1.4809E-01 2.0004E-01 -1.6855E-01 8.0066E-02 -1.9262E-02 1.8255E-03 0.0000E+00 S6 4.6157E-03 -1.0783E-01 1.5952E-01 -1.7167E-01 1.2106E-01 -5.2100E-02 1.3251E-02 -1.8440E-03 1.0876E-04 S7 2.6981E-01 -4.1549E-01 4.4362E-01 -3.1902E-01 1.6071E-01 -5.2863E-02 1.0114E-02 -9.4546E-04 2.7631E-05 S8 1.1873E-01 -1.4167E-01 1.3668E-01 -8.2661E-02 3.4341E-02 -1.0158E-02 2.0509E-03 -2.5431E-04 1.4934E-05 S9 -8.0696E-02 2.6514E-02 -3.7384E-03 -3.1365E-03 2.1005E-03 -5.9659E-04 9.1594E-05 -7.3441E-06 2.4037E-07 S10 -1.2775E-01 7.9161E-02 -3.9546E-02 1.3747E-02 -3.2018E-03 4.8266E-04 -4.5056E-05 2.3630E-06 -5.3023E-08

[0157] Table 16

[0158] Fig.16A An astigmatism curve of the optical imaging system of Example 8 is shown, which indicates meridional image curvature and sagittal image curvature. Fig. 16B 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. 16C The relative illumination curve of the optical imaging system of Example 8 is shown, which indicates the relative illumination change corresponding to different image heights. FIG. 16A to FIG. 16C It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0159] Example 9

[0160] The following reference Figures 17 to 18C An optical imaging system according to Example 9 of the present application is described. Fig.17 A schematic structural diagram of an optical imaging system according to Example 9 of the present application is shown.

[0161] like Fig.17 As shown, the optical imaging system includes, from the object side to the image side, a first lens E1, a stop STO, a second lens E2, 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 negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, 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.

[0163] In this example, the total effective focal length f of the optical imaging system is 4.11 mm, the maximum field of view FOV of the optical imaging system is 33.9°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.12.

[0164] Table 17 shows a basic parameter table of the optical imaging system of Example 9, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 18 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 9, wherein each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0165]

[0166] Table 17

[0167] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.8854E-02 1.7907E-02 -8.1682E-03 2.2052E-03 -3.2400E-04 1.5419E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.8476E-02 3.5539E-03 -8.7047E-05 -3.0658E-04 3.5870E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.0381E-01 -1.5663E-01 1.5568E-01 -1.1537E-01 5.6129E-02 -1.6763E-02 2.7696E-03 -1.9317E-04 0.0000E+00 S4 -7.1605E-03 -2.7545E-02 2.2170E-02 -2.4559E-02 1.6936E-02 -6.7604E-03 1.5145E-03 -1.7184E-04 7.2871E-06 S5 -1.0258E-02 -2.8397E-02 1.7199E-02 -5.3161E-03 -4.6221E-03 3.7041E-03 -8.9554E-04 7.3086E-05 0.0000E+00 S6 -2.1013E-03 -2.1650E-02 -2.2111E-03 1.9902E-02 -2.0348E-02 9.9354E-03 -2.5321E-03 3.2435E-04 -1.6531E-05 S7 1.1492E-01 -1.0544E-01 6.7070E-02 -2.8736E-02 8.6246E-03 -1.6901E-03 1.9266E-04 -1.0730E-05 1.8682E-07 S8 7.8699E-02 -3.3731E-02 -8.8176E-03 1.7972E-02 -9.3234E-03 2.5770E-03 -4.1129E-04 3.5938E-05 -1.3367E-06 S9 3.7312E-02 -3.4777E-02 1.5622E-02 -4.2561E-03 7.3022E-04 -7.8751E-05 5.1293E-06 -1.8325E-07 2.7485E-09 S10 1.6513E-02 -8.3794E-03 3.3351E-03 -9.6682E-04 1.8004E-04 -2.1082E-05 1.4862E-06 -5.7201E-08 9.1809E-10

[0168] Table 18

[0169] Fig.18A 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.18B 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.18C The relative illumination curve of the optical imaging system of Example 9 is shown, which indicates the relative illumination change corresponding to different image heights. 18A to 18C It can be seen that the optical imaging system provided in Example 9 can achieve good imaging quality.

[0170] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 19.

[0171] Conditional / Example 1 2 3 4 5 6 7 8 9 EPD / CT2 6.18 6.30 6.09 5.97 7.44 5.95 6.17 6.88 5.43 (T34+CT4) / CT5 0.90 1.15 1.33 0.79 1.21 0.83 1.22 0.97 0.70 ImgH / EPD 0.73 0.94 0.94 0.68 0.94 0.77 0.95 0.92 0.79 f / TTL×EPD(mm) 2.56 1.81 1.91 2.94 1.80 2.33 1.87 1.90 1.89 f3 / f 1.87 1.56 1.63 0.92 1.45 2.15 1.67 1.33 1.89 f / |f4| 0.02 0.04 0.04 0.02 0.07 0.02 0.03 0.02 0.23 f / R7+f / R8 -7.02 -5.50 -6.30 -6.62 -5.08 -6.11 -5.46 -5.93 -7.01 R2 / R1 1.21 0.89 1.06 1.23 2.10 0.98 1.31 1.40 0.70 f / R3+f / R4 3.59 3.26 3.03 3.52 2.85 3.31 2.90 2.94 3.81 f / (T12+T23) 3.34 4.40 3.92 4.01 3.70 3.70 3.80 3.56 3.90 CT2 / CT1 0.78 0.92 0.91 0.64 0.64 0.79 0.87 0.73 1.23 DT11 / DT42 0.99 0.88 0.95 1.18 0.87 1.00 0.90 0.90 0.85 (|SAG32|+T34) / |SAG41| 1.22 2.03 1.58 1.44 1.47 1.23 2.23 1.41 1.04 SAG42 / ET45 -0.66 -0.72 -0.82 -0.70 -0.76 -0.73 -0.85 -0.99 -0.57 R7 / R8 0.88 0.83 0.85 0.91 0.82 0.87 0.89 0.84 0.70 f / EPD 1.11 1.11 1.11 1.10 1.12 1.11 1.11 1.11 1.12

[0172] Table 19

[0173] 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.

[0174] 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: A first lens having optical power, wherein the object side surface is convex and the image side surface is concave; a second lens having optical power, wherein the object side surface is convex and the image side surface is concave; a third lens having positive refractive power; a fourth lens having optical power, whose object side surface is concave and whose image side surface is convex; a fifth lens having optical power; Wherein, the number of lenses having optical power in the optical imaging system is five; The fourth lens has negative optical power, and at most one of the first lens, the second lens and the fifth lens has negative optical power; or, the first lens, the second lens, the fourth lens and the fifth lens have positive optical power; The total effective focal length f of the optical imaging system, the spacing distance T12 between the first lens and the second lens on the optical axis, and the spacing distance T23 between the second lens and the third lens on the optical axis satisfy: 3.34≤f / (T12+T23)≤4.4; The total effective focal length f of the optical imaging system, the entrance pupil diameter EPD of the optical imaging system, and the distance TTL from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis satisfy: 1.8mm≤f / TTL×EPD≤2.94mm.

2. The optical imaging system according to claim 1, characterized in that: The entrance pupil diameter EPD of the optical imaging system and the center thickness CT2 of the second lens satisfy: 5.43≤EPD / CT2≤7.

44.

3. The optical imaging system according to claim 1, characterized in that: The center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.7≤(T34+CT4) / CT5≤1.

33.

4. The optical imaging system according to claim 1, characterized in that: The total effective focal length f of the optical imaging system and the effective focal length f3 of the third lens satisfy: 0.92≤f3 / f≤2.

15.

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 effective focal length f4 of the fourth lens satisfy: 0.02≤f / |f4|≤0.

23.

6. The optical imaging system according to claim 1, characterized in that: 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 satisfy: -7.02≤f / R7+f / R8≤-5.

08.

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: 0.7≤R2 / R1≤2.

1.

8. The optical imaging system according to claim 1, characterized in that: The total effective focal length f of the optical imaging system, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 2.85≤f / R3+f / R4≤3.

81.

9. The optical imaging system according to claim 1, characterized in that: A center thickness CT1 of the first lens and a center thickness CT2 of the second lens satisfy: 0.64≤CT2 / CT1≤1.

23.

10. 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 and the maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: 0.85≤DT11 / DT42≤1.

2.

11. The optical imaging system according to claim 1, characterized in that: The distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the maximum effective radius of the image side surface of the third lens on the optical axis, the distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the maximum effective radius of the object side surface of the fourth lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0≤(|SAG32|+T34) / |SAG41|≤2.

23.

12. The optical imaging system according to claim 1, characterized in that: The distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the maximum effective radius vertex of the image side surface of the fourth lens on the optical axis and the spacing distance ET45 between the fourth lens and the fifth lens at the maximum effective radius satisfy: -1.0≤SAG42 / ET45≤-0.

57.

13. The optical imaging system according to claim 1, characterized in that: A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 0.7≤R7 / R8≤0.

91.

14. 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: 1.1≤f / EPD<1.

2.

15. The optical imaging system according to claim 14, characterized in that: The entrance pupil diameter EPD of the optical imaging system and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfy: 0.68≤ImgH / EPD≤0.95.

Images