Optical imaging system

Abstract

The present application discloses an optical imaging system, which comprises, in order from the object side to the image side along the optical axis: a first lens with optical focal length; a second lens with negative optical focal length; a third lens with optical focal length; a fourth lens with positive optical focal length; a fifth lens with optical focal length; a sixth lens with optical focal length; and a seventh lens with optical focal length, wherein the object side surface of the optical imaging system is a concave surface, and the image side surface is a concave surface; half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfies ImgH>6.0mm; 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<1.9.

Description

Technical Field

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

[0002] In recent years, with the upgrading of portable electronic products, the market demand for optical imaging systems suitable for portable electronic products has gradually increased. For example, the camera module on the back of a mobile phone is usually upgraded to a multi-camera module, which may include two, three or more optical imaging systems. Each optical imaging system focuses on different optical performance, but usually one of them is used as the main camera.

[0003] The continuous development of image and video software functions on portable electronic products has enabled the application of optical imaging systems with better optical performance on mobile phones and other electronic products. However, due to the small size of portable electronic products such as mobile phones, it is difficult to design high-performance optical imaging systems. In addition, when the number of lenses in the optical imaging system increases, the design difficulty will be further increased.

[0004] In order to meet the needs of miniaturization and imaging requirements, an optical imaging system is needed that can take into account miniaturization and a large image surface, a wide angle, and a large aperture. Summary of the invention

[0005] The present application provides an optical imaging system that is applicable to portable electronic products and can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art.

[0006] 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 power; a second lens with negative optical power; a third lens with optical power; a fourth lens with positive optical power; a fifth lens with optical power; a sixth lens with optical power; and a seventh lens with optical power, wherein the object side surface of the lens may be a concave surface, and the image side surface may be a concave surface.

[0007] In one embodiment, half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system may satisfy ImgH>6.0 mm.

[0008] In one embodiment, a spacing distance TTL from the object side surface of the first lens to the imaging surface on the optical axis and an entrance pupil diameter EPD of the optical imaging system may satisfy TTL / EPD<2.5.

[0009] In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f6 of the sixth lens may satisfy 1.15<f6 / f<1.65.

[0010] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens may satisfy 1.3<f6 / f1<1.7.

[0011] In one embodiment, the on-axis distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens and the on-axis distance SAG51 from the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens may satisfy 1.2<SAG51 / SAG42<2.5.

[0012] In one embodiment, the curvature radius R3 of the object-side surface of the second lens and the total effective focal length f of the optical imaging system may satisfy 1.3<R3 / f<3.

[0013] In one embodiment, a distance T34 between the third lens and the fourth lens on the optical axis and an edge thickness ET6 of the sixth lens may satisfy 0.2<T34 / ET6<0.6.

[0014] In one embodiment, a curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens may satisfy 1.5<(R9+R10) / R10<2.3.

[0015] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens may satisfy -6.0<f2 / f1<-2.5.

[0016] In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f / EPD<1.9.

[0017] In one embodiment, half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system and the spacing distance TTL from the object side surface of the first lens to the imaging plane on the optical axis may satisfy TTL / ImgH<1.2.

[0018] In one embodiment, the combined focal length f123 of the first lens to the third lens and the total effective focal length f of the optical imaging system may satisfy 1.0<f123 / f<1.5.

[0019] In one embodiment, the on-axis distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the effective radius vertex of the object side surface of the sixth lens, the on-axis distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens, and the on-axis distance SAG71 from the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens may satisfy -4<SAG61 / (SAG62-SAG71)<-1.

[0020] In one embodiment, a distance T23 between the second lens and the third lens on the optical axis and a distance T34 between the third lens and the fourth lens on the optical axis may satisfy 1.7<T23 / T34<3.7.

[0021] In one embodiment, the object-side surface of the fifth lens element may be a convex surface.

[0022] In one embodiment, the object-side surface of the sixth lens element may be a convex surface.

[0023] The present application adopts seven lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned optical imaging system has at least one beneficial effect of miniaturization and large image surface, wide angle, large aperture, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

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

[0026] 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. 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; 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;

[0028] 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. 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;

[0029] 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. 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;

[0030] 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. 12D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 6 are respectively shown;

[0031] 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. 14D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 7 are respectively shown;

[0032] 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. 16D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system of Example 8 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, for example, seven lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, any two adjacent lenses may have an air gap between them.

[0042] In an exemplary embodiment, the first lens has positive or negative optical power; the second lens may have negative optical power; the third lens has positive or negative optical power; the fourth lens may have positive optical power; the fifth lens has positive or negative optical power; the sixth lens has positive or negative optical power; the seventh lens has positive or negative optical power, and its object side surface is concave and its image side surface is concave. By controlling the positive and negative distribution of the optical power of each component of the optical imaging system and the curvature of the lens surface, the low-order aberrations of the control system can be effectively balanced.

[0043] In an exemplary embodiment, the object side surface of the fifth lens may be a convex surface. Exemplarily, the object side surface of the sixth lens may be a convex surface. By controlling the surface shape of each lens, it is helpful to reduce the sensitivity of the optical imaging system to tolerance, thereby helping to maintain the miniaturization of the optical imaging system.

[0044] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula: TTL / ImgH<1.2, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, and TTL is the spacing distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system. In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula: ImgH>6.0mm. More specifically, the optical imaging system may satisfy 6.0mm<ImgH<6.2mm, and 1.15<TTL / ImgH<1.19. On the basis of controlling the surface shape and optical focal length of each lens of the optical imaging system, by controlling the image height and the total optical length of the optical imaging system, it is beneficial to make the optical imaging system compact in structure, small in size, and have the characteristics of high pixels.

[0045] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.15<f6 / f<1.65, where f is the total effective focal length of the optical imaging system, and f6 is the effective focal length of the sixth lens. More specifically, f and f6 may satisfy 1.18<f6 / f<1.60. By constraining the ratio of the effective focal length of the sixth lens to the total effective focal length, it is helpful to constrain the field curvature of the optical imaging system, thereby enabling the optical imaging system to have better resolution.

[0046] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.3<f6 / f1<1.7. Wherein, f1 is the effective focal length of the first lens, and f6 is the effective focal length of the sixth lens. More specifically, f1 and f6 may satisfy 1.33<f6 / f1<1.68. By controlling the ratio of the effective focal length of the sixth lens to the effective focal length of the first lens, it is helpful to control the spherical aberration contribution rate of the sixth lens to the optical imaging system and control the spherical aberration contribution rate of the first lens to the optical imaging system, thereby making the on-axis field of view of the optical imaging system have good imaging quality.

[0047] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.2<SAG51 / SAG42<2.5, wherein SAG42 is the on-axis distance from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the effective radius of the image side surface of the fourth lens, and SAG51 is the on-axis distance from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens. More specifically, SAG42 and SAG51 may satisfy 1.35<SAG51 / SAG42<2.48. By controlling the ratio of the sagittal height of the object side surface of the fifth lens to the sagittal height of the image side surface of the fourth lens, it is beneficial to control the shape of the fourth lens and the shape of the fifth lens, so that the processability of the fourth lens and the processability of the fifth lens are improved, which is beneficial to the respective processing and molding of the fourth lens and the fifth lens and to the assembly of the lenses to the optical imaging system. It is also beneficial to control the deflection angle of the light of the optical imaging system, thereby improving the matching degree between the optical imaging system and the image sensor chip.

[0048] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.3<R3 / f<3, where R3 is the radius of curvature of the object side of the second lens, and f is the total effective focal length of the optical imaging system. More specifically, R3 and f may satisfy 1.33<R3 / f<2.90. By controlling the ratio of the radius of curvature of the object side of the second lens to the total effective focal length, the deflection of light incident into the optical imaging system at the second lens can be effectively controlled, thereby enabling the optical imaging system to have a higher aberration correction capability. In addition, the second lens can also have better processability.

[0049] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.2<T34 / ET6<0.6, wherein T34 is the distance between the third lens and the fourth lens on the optical axis, and ET6 is the edge thickness of the sixth lens. More specifically, T34 and ET6 may satisfy 0.30<T34 / ET6<0.56. By controlling the ratio of the distance between the third lens and the fourth lens on the optical axis to the edge thickness of the sixth lens, it is beneficial to control the field curvature contribution of each field of view of the optical imaging system and improve the processing performance of the sixth lens, thereby enabling the optical imaging system to have good imaging quality and lower sensitivity.

[0050] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.5<(R9+R10) / R10<2.3, wherein R9 is the radius of curvature of the object side of the fifth lens, and R10 is the radius of curvature of the image side of the fifth lens. More specifically, R9 and R10 may satisfy 1.6<(R9+R10) / R10<2.2. By matching the radii of curvature of the two sides of the fifth lens, the shape of the fifth lens can be effectively controlled, so that the fifth lens has better processing performance, and the refraction angle of the light beam entering the optical imaging system at the fifth lens is controlled, thereby making the optical imaging system better matched with the image sensor chip.

[0051] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -6.0<f2 / f1<-2.5, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens. More specifically, f1 and f2 may satisfy -5.6<f2 / f1<-2.7. By controlling the ratio of the effective focal length of the second lens to the effective focal length of the first lens, it is beneficial to control the field curvature contribution of the first lens and the field curvature contribution of the second lens, so that the two are balanced in a desired state.

[0052] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula f / EPD<1.9, 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 satisfy 1.70<f / EPD<1.89. By controlling the ratio of the total effective focal length and the entrance pupil diameter, it is beneficial to increase the amount of light passing through the optical imaging system, thereby reducing the aberration of the edge field of view while enhancing the imaging effect of the optical imaging system in a dark environment, so that the optical imaging system has the advantage of a large aperture.

[0053] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula TTL / EPD<2.5, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and EPD is the entrance pupil diameter of the optical imaging system. More specifically, TTL and EPD may satisfy 1.90<TTL / EPD≤2.19. By controlling the ratio of the total optical length of the optical imaging system to the entrance pupil diameter, the size of the optical imaging system can be effectively compressed to maintain the ultra-thin characteristics of the optical imaging system, thereby maintaining the miniaturization characteristics of the optical imaging system.

[0054] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.0<f123 / f<1.5, wherein f123 is the combined focal length of the first lens to the third lens, and f is the total effective focal length of the optical imaging system. More specifically, f123 and f may satisfy 1.10<f123 / f<1.45. By controlling the ratio of the combined focal length of the first lens to the third lens to the total effective focal length, the spherical aberration generated by the third lens and its object-side lens can be effectively balanced, and the on-axis field of view of the optical imaging system can be more strongly controlled, thereby enabling the optical imaging system to have better image quality.

[0055] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -4<SAG61 / (SAG62-SAG71)<-1, wherein SAG61 is the on-axis distance from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens, SAG62 is the on-axis distance from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens, and SAG71 is the on-axis distance from the intersection of the object side surface of the seventh lens and the optical axis to the vertex of the effective radius of the object side surface of the seventh lens. More specifically, SAG61, SAG62, and SAG71 may satisfy -3.7<SAG61 / (SAG62-SAG71)<-1.4. By matching the vector heights of the two side surfaces of the sixth lens and each surface of the object side surface of the seventh lens, the shape of the sixth lens and the shape of the seventh lens can be effectively controlled, which is beneficial to the processing and molding of the sixth lens and the seventh lens. In addition, it is also beneficial to effectively control the direction of light in the optical imaging system, thereby enabling the optical imaging system to have good image quality.

[0056] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.7<T23 / T34<3.7, wherein T23 is the spacing distance between the second lens and the third 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, T23 and T34 may satisfy 1.80<T23 / T34<3.65. By controlling the air spacing between the second lens to the fourth lens, the field curvature of the optical imaging system can be effectively controlled so that the field curvature is within a smaller range, thereby enabling the optical imaging system to have good imaging quality.

[0057] In an exemplary embodiment, the optical imaging system may further include at least one aperture. The aperture may be disposed at an appropriate position as required, for example, between the 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.

[0058] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the seven lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, etc., the volume of the optical imaging system can be effectively reduced, the sensitivity of the optical imaging system can be reduced, and the processability of the optical imaging system can be improved, so that the optical imaging system is more conducive to production and processing and can be applied to portable electronic products. At the same time, the optical imaging system of the present application also has excellent optical properties such as large image surface, wide angle, large aperture, etc.

[0059] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the seventh 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 surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical mirror surfaces.

[0060] 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 seven lenses are described as an example in the embodiment, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0061] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0062] Example 1

[0063] 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.

[0064] like Figure 1As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0065] 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 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 positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0066] 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).

[0067]

[0068]

[0069] Table 1

[0070] In Example 1, the total effective focal length f of the optical imaging system is 6.30 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.08 mm, the half diagonal length ImgH of the effective pixel area on the imaging surface S17 is 6.13 mm, and the half maximum field of view angle Semi-FOV is 43.92°.

[0071] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 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:

[0072]

[0073] 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 .

[0074] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -3.0220E-03 9.2235E-03 -1.5861E-02 1.6849E-02 -1.1336E-02 4.8219E-03 -1.2566E-03 1.8157E-04 -1.1159E-05 S2 1.9294E-05 -3.4576E-03 5.5306E-03 -1.1064E-02 1.2067E-02 -7.4599E-03 2.6693E-03 -5.0784E-04 3.9251E-05 S3 -1.9503E-03 -4.8855E-03 2.0768E-02 -3.4014E-02 3.2583E-02 -1.8605E-02 6.2800E-03 -1.1389E-03 8.4773E-05 S4 2.6101E-03 2.7470E-02 -7.4948E-02 1.3224E-01 -1.4146E-01 9.3432E-02 -3.7244E-02 8.2424E-03 -7.7661E-04 S5 -2.3450E-02 4.2966E-02 -1.2540E-01 2.0500E-01 -2.0705E-01 1.2958E-01 -4.8909E-02 1.0230E-02 -9.1406E-04 S6 -2.0464E-02 -3.6617E-03 2.5038E-02 -5.2539E-02 5.7373E-02 -3.6232E-02 1.3364E-02 -2.6184E-03 2.0574E-04 S7 -2.7628E-02 2.5506E-03 -2.5543E-03 -1.1467E-03 4.0330E-03 -3.4962E-03 1.5334E-03 -3.1522E-04 2.3759E-05 S8 -2.3046E-02 -2.5849E-03 9.2377E-03 -2.0138E-02 2.1195E-02 -1.2993E-02 4.7069E-03 -9.3637E-04 7.9469E-05 S9 -1.6070E-02 -2.0231E-02 4.2030E-02 -5.0519E-02 3.6087E-02 -1.6073E-02 4.3290E-03 -6.4445E-04 4.0605E-05 S10 -3.4359E-02 8.1982E-03 -5.0607E-03 3.2013E-03 -1.3997E-03 3.5460E-04 -4.9198E-05 3.4896E-06 -9.9466E-08 S11 -9.9872E-03 -9.3831E-03 1.5113E-03 1.4595E-04 -9.9888E-05 2.0313E-05 -2.1440E-06 1.1528E-07 -2.4916E-09 S12 1.8807E-02 -1.3402E-02 1.8420E-03 2.0180E-04 -9.0305E-05 1.1709E-05 -7.5907E-07 2.4588E-08 -3.0839E-10 S13 -1.1954E-02 -7.0092E-03 3.9827E-03 -7.9494E-04 8.7294E-05 -5.8046E-06 2.3385E-07 -5.2718E-09 5.1150E-11 S14 -9.3676E-03 -4.3961E-03 1.8465E-03 -3.3119E-04 3.3940E-05 -2.1330E-06 8.1703E-08 -1.7523E-09 1.6104E-11

[0075] Table 2

[0076] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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 system. FIG. 2A to FIG. 2D It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0077] Example 2

[0078] 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.

[0079] like Figure 3 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0080] 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 convex, and its image side surface S8 is concave. 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0081] In Example 2, the total effective focal length f of the optical imaging system is 6.30 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.08 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.12 mm, and the half of the maximum field of view angle Semi-FOV is 43.93°.

[0082] 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.

[0083]

[0084] Table 3

[0085]

[0086]

[0087] Table 4

[0088] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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 system. FIG. 4A to FIG. 4D 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 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.

[0091] like Figure 5 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[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 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 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 positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0093] In Example 3, the total effective focal length f of the optical imaging system is 6.20 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.08 mm, the half diagonal length ImgH of the effective pixel area on the imaging surface S17 is 6.05 mm, and the half maximum field of view angle Semi-FOV is 43.97°.

[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]

[0097] Table 5

[0098] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.4803E-04 2.4868E-03 -2.7675E-03 1.1859E-03 9.4601E-04 -1.4742E-03 7.6633E-04 -1.8836E-04 1.7736E-05 S2 -1.5657E-02 2.9553E-03 1.9793E-02 -3.6378E-02 3.5386E-02 -2.1347E-02 7.8044E-03 -1.5764E-03 1.3494E-04 S3 -2.7082E-02 2.2654E-02 1.6665E-02 -4.9375E-02 5.5867E-02 -3.7401E-02 1.5141E-02 -3.3911E-03 3.2365E-04 S4 -6.8023E-03 1.4140E-02 2.9775E-02 -7.9223E-02 1.0198E-01 -8.1079E-02 3.9833E-02 -1.0995E-02 1.3089E-03 S5 -2.6816E-02 1.8289E-02 -3.6925E-02 5.4293E-02 -5.7524E-02 4.0041E-02 -1.7507E-02 4.4334E-03 -5.0172E-04 S6 -2.7069E-02 2.0461E-02 -2.6850E-02 2.9206E-02 -2.4464E-02 1.5166E-02 -6.4751E-03 1.7470E-03 -2.1370E-04 S7 -3.9979E-02 2.8053E-02 -5.7135E-02 8.7748E-02 -9.5119E-02 6.7183E-02 -2.9359E-02 7.1657E-03 -7.3481E-04 S8 -3.7726E-02 1.5259E-02 -2.1073E-02 1.7938E-02 -1.0532E-02 3.4767E-03 -4.3461E-04 -6.2905E-05 1.8447E-05 S9 -4.3249E-02 9.4301E-03 -7.8827E-03 9.9242E-03 -9.4306E-03 4.9140E-03 -1.4275E-03 2.1712E-04 -1.3336E-05 S10 -5.4455E-02 8.3053E-03 7.0647E-04 -5.2316E-04 -3.3214E-04 2.3848E-04 -5.3851E-05 5.3466E-06 -2.0007E-07 S11 -1.6773E-02 -1.1139E-02 3.6547E-03 -8.0274E-04 1.3730E-04 -1.5471E-05 1.0371E-06 -3.7495E-08 5.6421E-10 S12 2.3217E-02 -1.8774E-02 4.6076E-03 -6.2546E-04 5.2143E-05 -2.6471E-06 7.3457E-08 -7.7491E-10 -2.8457E-12 S13 -1.6928E-02 -1.0243E-03 1.5531E-03 -3.0963E-04 3.1445E-05 -1.8961E-06 6.8874E-08 -1.3982E-09 1.2222E-11 S14 -1.4919E-02 8.6208E-04 3.5488E-04 -9.8980E-05 1.1536E-05 -7.5125E-07 2.8548E-08 -5.9258E-10 5.1890E-12

[0099] Table 6

[0100] Fig. 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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 system. FIG. 6A to FIG. 6D 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 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.

[0103] like Figure 7 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[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 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0105] In Example 4, the total effective focal length f of the optical imaging system is 6.19 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.10 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.04 mm, and the half of the maximum field of view angle Semi-FOV is 43.90°.

[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] Table 7

[0109] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.5347E-04 1.4822E-03 -9.4858E-04 -7.8790E-04 2.1405E-03 -1.8630E-03 8.1928E-04 -1.8737E-04 1.7148E-05 S2 -1.8644E-02 8.0896E-03 1.5880E-02 -3.4046E-02 3.3840E-02 -2.0413E-02 7.4335E-03 -1.4941E-03 1.2710E-04 S3 -2.6803E-02 2.6259E-02 1.1719E-02 -4.5817E-02 5.3513E-02 -3.5837E-02 1.4399E-02 -3.1931E-03 3.0145E-04 S4 -5.7836E-03 1.5140E-02 2.8847E-02 -9.0202E-02 1.2862E-01 -1.1081E-01 5.8090E-02 -1.6944E-02 2.1153E-03 S5 -2.5466E-02 6.8339E-03 2.0962E-03 -2.9770E-02 5.5307E-02 -5.4653E-02 3.0950E-02 -9.3818E-03 1.1831E-03 S6 -2.5214E-02 1.6752E-02 -2.1619E-02 2.3199E-02 -1.9486E-02 1.2271E-02 -5.2126E-03 1.3972E-03 -1.7189E-04 S7 -3.4756E-02 2.0629E-02 -3.7162E-02 5.0383E-02 -5.2425E-02 3.6879E-02 -1.6292E-02 4.0462E-03 -4.2145E-04 S8 -3.6566E-02 1.5742E-02 -2.0594E-02 1.4669E-02 -6.3460E-03 7.0869E-04 6.0039E-04 -2.6963E-04 3.5511E-05 S9 -4.6253E-02 1.2620E-02 -7.7716E-03 6.7736E-03 -6.3443E-03 3.4379E-03 -1.0382E-03 1.6318E-04 -1.0277E-05 S10 -5.8423E-02 1.3765E-02 -1.8041E-03 -2.9164E-04 -7.2114E-06 7.5881E-05 -2.0581E-05 2.1317E-06 -7.9479E-08 S11 -2.1525E-02 -8.6412E-03 3.9236E-03 -1.1197E-03 2.0514E-04 -2.2360E-05 1.3996E-06 -4.6184E-08 5.9107E-10 S12 2.0084E-02 -1.7202E-02 4.9797E-03 -9.0220E-04 1.1157E-04 -9.2486E-06 4.8503E-07 -1.4444E-08 1.8538E-10 S13 -1.7323E-02 -1.2965E-03 1.7220E-03 -3.4146E-04 3.4498E-05 -2.0650E-06 7.4381E-08 -1.4983E-09 1.3021E-11 S14 -1.3868E-02 7.0450E-04 3.5826E-04 -9.9500E-05 1.1889E-05 -7.9880E-07 3.1322E-08 -6.6882E-10 6.0021E-12

[0110] Table 8

[0111] Fig. 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Figure 8B An astigmatism curve of the optical imaging system of Example 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.8D The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 8A to FIG. 8DIt can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0112] Example 5

[0113] 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.

[0114] like Fig. 9 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0115] 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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0116] In Example 5, the total effective focal length f of the optical imaging system is 6.19 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.10 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.04 mm, and the half of the maximum field of view angle Semi-FOV is 43.88°.

[0117] 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.

[0118]

[0119]

[0120] Table 9

[0121] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.4899E-04 1.6103E-03 -1.4413E-03 1.3164E-05 1.4603E-03 -1.5355E-03 7.3120E-04 -1.7581E-04 1.6629E-05 S2 -1.8572E-02 8.0928E-03 1.6437E-02 -3.5512E-02 3.5712E-02 -2.1798E-02 8.0361E-03 -1.6367E-03 1.4122E-04 S3 -2.6538E-02 2.6399E-02 1.0566E-02 -4.4393E-02 5.2838E-02 -3.5921E-02 1.4636E-02 -3.2895E-03 3.1462E-04 S4 -5.3484E-03 1.5087E-02 2.6928E-02 -8.5180E-02 1.2152E-01 -1.0465E-01 5.4904E-02 -1.6052E-02 2.0124E-03 S5 -2.5221E-02 6.3294E-03 1.6827E-03 -2.5887E-02 4.7929E-02 -4.7445E-02 2.7033E-02 -8.2675E-03 1.0539E-03 S6 -2.5771E-02 1.9256E-02 -2.9260E-02 3.6807E-02 -3.4055E-02 2.2011E-02 -9.1644E-03 2.2763E-03 -2.5360E-04 S7 -3.5224E-02 2.3480E-02 -4.5702E-02 6.3823E-02 -6.5174E-02 4.4385E-02 -1.8933E-02 4.5439E-03 -4.5916E-04 S8 -3.6391E-02 1.4595E-02 -1.7422E-02 9.6158E-03 -1.5773E-03 -2.0283E-03 1.5456E-03 -4.5087E-04 5.0340E-05 S9 -4.8931E-02 1.6740E-02 -1.2272E-02 1.0198E-02 -7.9995E-03 3.9218E-03 -1.1161E-03 1.6873E-04 -1.0348E-05 S10 -6.0762E-02 1.6584E-02 -3.8681E-03 7.2126E-04 -3.4468E-04 1.4942E-04 -3.0428E-05 2.8594E-06 -1.0207E-07 S11 -2.2050E-02 -8.0797E-03 3.7193E-03 -1.0836E-03 2.0213E-04 -2.2430E-05 1.4431E-06 -5.0551E-08 7.8926E-10 S12 1.9669E-02 -1.6791E-02 4.8480E-03 -8.8057E-04 1.0960E-04 -9.1506E-06 4.8276E-07 -1.4433E-08 1.8559E-10 S13 -1.7382E-02 -1.2332E-03 1.7032E-03 -3.3830E-04 3.4185E-05 -2.0467E-06 7.3777E-08 -1.4882E-09 1.2961E-11 S14 -1.3885E-02 7.7177E-04 3.3494E-04 -9.5143E-05 1.1412E-05 -7.6749E-07 3.0108E-08 -6.4325E-10 5.7755E-12

[0122] Table 10

[0123] Fig. 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. 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 system. 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 along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[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 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0128] In Example 6, the total effective focal length f of the optical imaging system is 6.14 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.10 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.04 mm, and the half of the maximum field of view angle Semi-FOV is 44.07°.

[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 2.2024E-04 3.7645E-03 -6.4813E-03 7.2063E-03 -4.9498E-03 2.0376E-03 -4.7690E-04 5.0222E-05 -1.2518E-06 S2 -1.7575E-02 8.2097E-03 1.4931E-02 -3.4176E-02 3.5841E-02 -2.2676E-02 8.6291E-03 -1.8092E-03 1.6034E-04 S3 -2.3745E-02 2.3058E-02 9.0119E-03 -3.9568E-02 4.9226E-02 -3.4929E-02 1.4792E-02 -3.4383E-03 3.3834E-04 S4 -2.4442E-03 1.1137E-02 2.5101E-02 -7.4482E-02 1.0429E-01 -8.7966E-02 4.5031E-02 -1.2800E-02 1.5564E-03 S5 -2.6434E-02 1.7676E-02 -3.7367E-02 5.2728E-02 -5.0420E-02 3.0559E-02 -1.1030E-02 2.1596E-03 -1.7673E-04 S6 -3.4517E-02 3.5104E-02 -5.3940E-02 6.2778E-02 -5.1093E-02 2.8617E-02 -1.0437E-02 2.3072E-03 -2.3550E-04 S7 -4.7219E-02 4.2249E-02 -7.2593E-02 9.1459E-02 -8.4663E-02 5.3527E-02 -2.1608E-02 4.9765E-03 -4.8818E-04 S8 -4.2130E-02 2.1293E-02 -2.3062E-02 1.3189E-02 -3.3459E-03 -1.2098E-03 1.2245E-03 -3.7022E-04 4.1352E-05 S9 -5.6713E-02 2.5738E-02 -1.5446E-02 7.9398E-03 -4.3362E-03 1.8205E-03 -4.8225E-04 7.0067E-05 -4.1743E-06 S10 -6.9439E-02 2.7716E-02 -1.2138E-02 4.6908E-03 -1.6087E-03 4.1448E-04 -6.5394E-05 5.4728E-06 -1.8604E-07 S11 -2.4797E-02 -3.8452E-03 2.2003E-03 -7.1812E-04 1.4051E-04 -1.5496E-05 9.5265E-07 -3.0143E-08 3.4716E-10 S12 1.4665E-02 -1.3875E-02 4.2259E-03 -8.2491E-04 1.1054E-04 -9.8140E-06 5.4226E-07 -1.6758E-08 2.2042E-10 S13 -1.9321E-02 -6.7720E-04 1.7266E-03 -3.5784E-04 3.6854E-05 -2.2315E-06 8.1081E-08 -1.6465E-09 1.4432E-11 S14 -1.3083E-02 7.6594E-04 2.7779E-04 -8.0604E-05 9.6903E-06 -6.5369E-07 2.5785E-08 -5.5443E-10 5.0052E-12

[0133] Table 12

[0134] Fig. 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 12B An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 12C The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12D The magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 12A to FIG. 12D It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0135] Example 7

[0136] The following reference Figures 13 to 14D An optical imaging system according to Example 7 of the present application is described. Fig.13 A schematic structural diagram of an optical imaging system according to Example 7 of the present application is shown.

[0137] like Fig.13 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0138] 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 concave. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0139] In Example 7, the total effective focal length f of the optical imaging system is 6.10 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.10 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.04 mm, and the half of the maximum field of view angle Semi-FOV is 44.28°.

[0140] 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.

[0141]

[0142] Table 13

[0143]

[0144]

[0145] Table 14

[0146] Fig.14A The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 14B An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig. 14C The distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14DThe magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 14A to FIG. 14D It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0147] Example 8

[0148] The following reference Figures 15 to 16D An optical imaging system according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical imaging system according to Example 8 of the present application is shown.

[0149] like Fig.15 As shown, the optical imaging system includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and a filter E8.

[0150] 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 sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging system has an imaging surface S17 , and light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S17 .

[0151] In Example 8, the total effective focal length f of the optical imaging system is 6.11 mm, the axial distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 is 7.10 mm, the half diagonal length of the effective pixel area on the imaging surface S17 ImgH is 6.05 mm, and the half of the maximum field of view angle Semi-FOV is 44.25°.

[0152] 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.

[0153]

[0154]

[0155] Table 15

[0156] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.5313E-04 2.3479E-03 -2.8643E-03 1.7922E-03 -2.6285E-05 -7.0025E-04 4.3081E-04 -1.1366E-04 1.1180E-05 S2 -1.9408E-02 9.6129E-03 1.8000E-02 -4.1347E-02 4.2996E-02 -2.6751E-02 9.9938E-03 -2.0593E-03 1.7977E-04 S3 -2.6816E-02 2.7208E-02 2.1941E-03 -2.8828E-02 3.6980E-02 -2.6203E-02 1.1109E-02 -2.5984E-03 2.5884E-04 S4 -3.0232E-03 7.1129E-03 4.2510E-02 -1.1504E-01 1.6085E-01 -1.3688E-01 7.0628E-02 -2.0232E-02 2.4756E-03 S5 -2.9228E-02 1.0067E-02 -5.4668E-03 -1.4668E-02 3.7007E-02 -4.0289E-02 2.3954E-02 -7.4764E-03 9.5953E-04 S6 -4.1432E-02 3.4445E-02 -4.4231E-02 4.6384E-02 -3.5552E-02 1.9975E-02 -7.7206E-03 1.8921E-03 -2.1644E-04 S7 -4.9944E-02 4.2619E-02 -7.2791E-02 9.4163E-02 -9.0192E-02 5.8942E-02 -2.4482E-02 5.7741E-03 -5.7861E-04 S8 -4.0445E-02 1.7590E-02 -1.8187E-02 8.7410E-03 -6.5721E-04 -2.2413E-03 1.4651E-03 -4.0139E-04 4.3116E-05 S9 -5.4781E-02 2.1387E-02 -7.3331E-03 -5.6050E-04 1.1641E-03 -3.6571E-04 4.1523E-05 9.9241E-07 -3.6205E-07 S10 -7.0446E-02 2.7242E-02 -9.7672E-03 2.4964E-03 -5.4520E-04 1.2242E-04 -2.0104E-05 1.7761E-06 -6.2425E-08 S11 -2.7423E-02 -3.0062E-03 2.2008E-03 -7.8054E-04 1.5632E-04 -1.7337E-05 1.0665E-06 -3.3712E-08 3.8788E-10 S12 1.2585E-02 -1.3159E-02 4.3073E-03 -8.9940E-04 1.2643E-04 -1.1540E-05 6.4622E-07 -2.0048E-08 2.6301E-10 S13 -2.0648E-02 -4.7935E-05 1.6291E-03 -3.4901E-04 3.6250E-05 -2.1990E-06 7.9877E-08 -1.6210E-09 1.4203E-11 S14 -1.3147E-02 1.0256E-03 1.7906E-04 -6.3434E-05 7.9420E-06 -5.4231E-07 2.1386E-08 -4.5584E-10 4.0490E-12

[0157] Table 16

[0158] Fig.16A The axial chromatic aberration curve of the optical imaging system of Example 8 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Fig. 16B An astigmatism curve of the optical imaging system of Example 8 is shown, which indicates meridional image curvature and sagittal image curvature. Fig. 16C The distortion curve of the optical imaging system of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16D The magnification chromatic aberration curve of the optical imaging system of Example 8 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 16A to FIG. 16D It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0159] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0160]

[0161]

[0162] Table 17

[0163] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (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.

[0164] 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 protection 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 concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

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 optical power and having a concave image-side surface; a fourth lens having positive refractive power; a fifth lens having optical power, wherein the object side surface is convex and the image side surface is concave; a sixth lens element having positive refractive power and having a convex object-side surface; and The seventh lens element has a negative optical power, and its object side surface is concave and its image side surface is concave; The total effective focal length f of the optical imaging system and the effective focal length f6 of the sixth lens satisfy 1.15<f6 / f<1.60; An axial distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens, an axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens, and an axial distance SAG71 from the intersection of the object side surface of the seventh lens and the optical axis to the vertex of the effective radius of the object side surface of the seventh lens satisfy -3.64≤SAG61 / (SAG62-SAG71)<-1.4; A curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy 1.70≤(R9+R10) / R10≤2.13; The distance TTL between the object side surface of the first lens and the imaging surface on the optical axis and the entrance pupil diameter EPD of the optical imaging system satisfy 1.90<TTL / EPD≤2.19; The number of lenses having optical power in the optical imaging system is seven.

2. The optical imaging system according to claim 1, characterized in that: Half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system and a spacing distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfy 1.15<TTL / ImgH<1.

2.

3. The optical imaging system according to claim 1, wherein: A half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfies 6.0 mm<ImgH≤6.13 mm.

4. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens satisfy 1.33<f6 / f1<1.

7.

5. The optical imaging system according to claim 1, characterized in that: An axial distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens and an axial distance SAG51 from the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens satisfy 1.35<SAG51 / SAG42<2.

5.

6. The optical imaging system according to claim 1, characterized in that: A curvature radius R3 of the object-side surface of the second lens and a total effective focal length f of the optical imaging system satisfy 1.3<R3 / f<2.

90.

7. The optical imaging system according to claim 1, characterized in that: A distance T34 between the third lens and the fourth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy 0.30<T34 / ET6<0.

56.

8. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy -5.53≤f2 / f1≤-2.

76.

9. 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 1.70<f / EPD<1.

9.

10. The optical imaging system according to claim 1, characterized in that: The combined focal length f123 of the first lens to the third lens and the total effective focal length f of the optical imaging system satisfy 1.15≤f123 / f<1.

45.

11. The optical imaging system according to claim 1, characterized in that: A distance T23 between the second lens and the third lens on the optical axis and a distance T34 between the third lens and the fourth lens on the optical axis satisfy 1.85≤T23 / T34<3.65.

Images