An optical imaging system

Abstract

The present invention discloses an optical imaging system, which comprises, in order from the object side to the image side along the optical axis: an aperture; a first lens with optical focal power; a second lens with optical focal power; a third lens with optical focal power; a fourth lens with optical focal power, the object side surface of which is concave and the image side surface of which is convex; a fifth lens with negative optical focal power; a sixth lens with optical focal power; and a seventh lens with optical focal power, the object side surface of which is concave; by reasonably controlling the effective focal length of the fifth lens, the optical focal power of the system can be reasonably distributed, so that the positive and negative spherical aberrations of the front lens group and the rear lens group offset each other.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging, and in particular relates to an optical imaging system comprising seven lenses. Background Art

[0002] In recent years, with the rapid development of mobile phone lenses, mobile phone lenses with high imaging quality and large image area are becoming more and more popular. However, when shooting distant objects, many mobile phones often cannot zoom in on the subject, so they cannot meet the demand for shooting close-up. In order to meet the requirements of high imaging quality and large image area, the present invention provides an optical imaging system with a long focus, large image area and large aperture to meet the higher-level imaging requirements of mobile phones. Summary of the invention

[0003] The present application aims to provide an optical imaging system composed of seven lenses, which has the characteristics of high pixel, large image surface and good imaging quality.

[0004] The present application proposes an optical imaging system, which includes, in order from the object side to the image side along the optical axis:

[0005] Aperture;

[0006] a first lens having optical power;

[0007] a second lens having optical power;

[0008] a third lens having optical power;

[0009] a fourth lens having optical power, whose object side surface is concave and whose image side surface is convex;

[0010] a fifth lens having negative optical power;

[0011] a sixth lens having optical power;

[0012] a seventh lens having optical power and having a concave object side surface;

[0013] The effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -9.5<f5 / f<-6.5.

[0014] According to one embodiment of the present application, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.8.

[0015] According to one embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.3.

[0016] According to one embodiment of the present application, half of the maximum field of view Semi-FOV of the optical imaging system satisfies: Semi-FOV>30°.

[0017] According to one embodiment of the present application, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens are: 0.5<R12 / R13<6.0.

[0018] According to one embodiment of the present application, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -4.0<f6 / f7<-1.5.

[0019] According to one embodiment of the present application, 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: 7.0<R2 / R1<8.5.

[0020] According to one embodiment of the present application, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens satisfy: 1.5<(SAG11+SAG21) / (SAG11-SAG21)<2.0.

[0021] According to one embodiment of the present application, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / ET1+ET2 / CT2<6.1.

[0022] According to one embodiment of the present application, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, and the edge thickness ET5 of the fifth lens satisfy: 1.5<(T45+CT5+T56) / ET5<2.0.

[0023] According to one embodiment of the present application, 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: 2.0<(R9+R10) / (R9-R10)<3.5.

[0024] According to one embodiment of the present application, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: -2.0<(1 / SAG52) / ImgH<-0.5.

[0025] According to one embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>35.

[0026] According to one embodiment of the present application, the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: V4=V5.

[0027] According to one embodiment of the present application, the axial distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture to the image side surface of the last lens satisfy: 1.0<TTL / SD<1.5.

[0028] The present application provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis:

[0029] Aperture;

[0030] a first lens having optical power;

[0031] a second lens having optical power;

[0032] a third lens having optical power;

[0033] a fourth lens having optical power, whose object side surface is concave and whose image side surface is convex;

[0034] a fifth lens having negative optical power;

[0035] a sixth lens having optical power;

[0036] a seventh lens having optical power and having a concave object side surface;

[0037] Wherein, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 7.0<R2 / R1<8.5.

[0038] According to one embodiment of the present application, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.8.

[0039] According to one embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.3.

[0040] According to one embodiment of the present application, half of the maximum field of view Semi-FOV of the optical imaging system satisfies: Semi-FOV>30°.

[0041] According to one embodiment of the present application, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens are: 0.5<R12 / R13<6.0.

[0042] According to one embodiment of the present application, the effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -9.5<f5 / f<-6.5.

[0043] According to one embodiment of the present application, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -4.0<f6 / f7<-1.5.

[0044] According to one embodiment of the present application, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens satisfy: 1.5<(SAG11+SAG21) / (SAG11-SAG21)<2.0.

[0045] According to one embodiment of the present application, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / ET1+ET2 / CT2<6.1.

[0046] According to one embodiment of the present application, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, and the edge thickness ET5 of the fifth lens satisfy: 1.5<(T45+CT5+T56) / ET5<2.0.

[0047] According to one embodiment of the present application, 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: 2.0<(R9+R10) / (R9-R10)<3.5.

[0048] According to one embodiment of the present application, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: -2.0<(1 / SAG52) / ImgH<-0.5.

[0049] According to one embodiment of the present application, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>35.

[0050] According to one embodiment of the present application, the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: V4=V5.

[0051] According to one embodiment of the present application, the axial distance TTL from the object side surface of the first lens to the imaging surface and the distance SD from the aperture to the image side surface of the last lens satisfy: 1.0<TTL / SD<1.5.

[0052] Beneficial effects of the present invention:

[0053] The optical imaging system provided by the present invention includes multiple lenses, such as the first lens to the seventh lens. By reasonably controlling the effective focal length of the fifth lens, the optical power of the system can be reasonably distributed so that the positive and negative spherical aberrations of the front lens group and the rear lens group cancel each other out. By reasonably distributing the optical power and constraining the entrance pupil diameter of the imaging system, the F number of the imaging system with a large image surface is small, which can ensure that the system has a large aperture imaging effect and has good imaging quality in a dark environment. By controlling the ratio of the on-axis distance from the object side of the first lens to the imaging surface and the effective focal length of the imaging lens group, the telephoto lens characteristics are effectively maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 Schematic diagram of the lens group structure of embodiment 1 of the optical imaging system of the present invention;

[0056] Figure 2a to Figure 2d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical imaging system embodiment 1 of the present invention;

[0057] Figure 3 Schematic diagram of the lens group structure of embodiment 2 of the optical imaging system of the present invention;

[0058] Figures 4a to 4d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 2 of the optical imaging system of the present invention;

[0059] Figure 5 Schematic diagram of the lens group structure of embodiment 3 of the optical imaging system of the present invention;

[0060] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 3 of the optical imaging system of the present invention;

[0061] Figure 7 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention;

[0062] Figures 8a to 8d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 4 of the optical imaging system of the present invention;

[0063] Fig. 9 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention;

[0064] Figures 10a to 10d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 4 of the optical imaging system of the present invention;

[0065] Fig.11 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention;

[0066] Figures 12a to 12d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 4 of the optical imaging system of the present invention;

[0067] Fig.13 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention;

[0068] Figures 14a to 14d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging system embodiment 4 of the present invention. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0070] 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 invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0071] 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.

[0072] 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.

[0073] In the description of the present invention, 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.

[0074] 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 way unless explicitly defined in this article.

[0075] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0076] Exemplary Embodiments

[0077] The optical imaging system of an exemplary embodiment of the present invention includes seven lenses, which include, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein each lens is independent of each other and has an air gap on the optical axis.

[0078] In this exemplary embodiment, the effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -9.5<f5 / f<-6.5. By properly controlling the effective focal length of the fifth lens, the optical power of the system can be properly allocated so that the positive and negative spherical aberrations of the front lens group and the rear lens group cancel each other out. More specifically, the effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -9.3<f5 / f<-6.90.

[0079] In this exemplary embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.8. By reasonably allocating the optical focal length and constraining the entrance pupil diameter of the imaging system, the F number of the imaging system with a large image surface is small, which can ensure that the system has a large aperture imaging effect and has good imaging quality in a dark environment. More specifically, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.70.

[0080] In this exemplary embodiment, the on-axis distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.3. By controlling the ratio of the on-axis distance from the object side of the first lens to the imaging surface and the effective focal length of the optical imaging lens group, the telephoto lens characteristics are effectively maintained. More specifically, the on-axis distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.2.

[0081] In this exemplary embodiment, the Semi-FOV of half of the maximum field of view of the optical imaging system satisfies: Semi-FOV>30°. By limiting the field of view of the system within a certain range, the focal length of the system can be effectively controlled, which is conducive to improving image quality. More specifically, the Semi-FOV of half of the maximum field of view of the optical imaging system satisfies: Semi-FOV>33°.

[0082] In this exemplary embodiment, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens are: 0.5<R12 / R13<6.0. By controlling the ratio of the radius of curvature of the object side of the sixth lens, the projection height of the light on the sixth surface can be adjusted, thereby controlling the aperture of the last surface. More specifically, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens are: 0.70<R12 / R13<5.8.

[0083] In this exemplary embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -4.0<f6 / f7<-1.5. By properly controlling the ratio of the effective focal lengths of the sixth lens and the seventh lens, the optical power of the system can be properly allocated so that the positive and negative spherical aberrations of the front lens group and the rear lens group cancel each other out. More specifically, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -3.6<f6 / f7<-1.70.

[0084] In this exemplary embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 7.0<R2 / R1<8.5. Reasonable configuration of the radius of curvature of the first lens can effectively realize its sharing of the large field of view on the object side and improve the correction ability of the subsequent optical group to off-axis aberrations. More specifically, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 7.20<R2 / R1<8.30.

[0085] In this exemplary embodiment, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens satisfy: 1.5<(SAG11+SAG21) / (SAG11-SAG21)<2.0. By rationally controlling the above conditions, it is beneficial to adjust the chief light angle of the camera lens group, which can effectively improve the relative brightness of the camera lens group and enhance the clarity of the image surface. More specifically, the on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens satisfy: 1.65<(SAG11+SAG21) / (SAG11-SAG21)<1.90.

[0086] In this exemplary embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.5<CT1 / ET1+ET2 / CT2<6.1. Reasonable configuration of the edge thickness and center thickness of each lens can effectively reduce the thickness sensitivity of the lens and correct field curvature. More specifically, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.55<CT1 / ET1+ET2 / CT2<6.1.

[0087] In this exemplary embodiment, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, and the edge thickness ET5 of the fifth lens satisfy: 1.5<(T45+CT5+T56) / ET5<2.0. Reasonable configuration of the air gaps of each lens can effectively reduce the thickness sensitivity of the lens and correct field curvature. More specifically, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, and the edge thickness ET5 of the fifth lens satisfy: 1.50<(T45+CT5+T56) / ET5<1.90.

[0088] In this exemplary embodiment, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the image side of the fifth lens satisfy: 2.0<(R9+R10) / (R9-R10)<3.5. By reasonably controlling the radius of curvature of the object side of the fifth lens and the radius of curvature of the image side of the fifth lens within a certain range, the aberration generated by the optical imaging system in the fifth lens can be effectively controlled. More specifically, the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the image side of the fifth lens satisfy: 2.10<(R9+R10) / (R9-R10)<3.4.

[0089] In this exemplary embodiment, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens and half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: -2.0<(1 / SAG52) / ImgH<-0.5. By controlling the ratio of the sag height of the image side surface of the fifth lens within a certain range, it is beneficial to reduce the sensitivity of the fifth objective lens and facilitate the processing and molding of the lens. More specifically, the on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens and half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: -1.55<(1 / SAG52) / ImgH<-0.85.

[0090] In this exemplary embodiment, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>35. By controlling the difference between the Abbe numbers of the first lens and the second lens, the chromatic aberration of the system can be effectively improved by using the first lens and the second lens, so that the optical system obtains better imaging quality. More specifically, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>35.5.

[0091] In this exemplary embodiment, the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: V4 = V5. By controlling the Abbe numbers of the fourth lens and the fifth lens, the chromatic aberration of the system can be effectively improved, so that the optical system obtains better imaging quality.

[0092] In this exemplary embodiment, the axial distance TTL from the object side of the first lens to the imaging surface and the distance SD from the aperture to the image side of the last lens satisfy: 1.0<TTL / SD<1.5. By constraining the relative relationship between the total length of the optical system and the position of the aperture, the distortion of the system can be reasonably controlled, so that the system can obtain good distortion. More specifically, the axial distance TTL from the object side of the first lens to the imaging surface and the distance SD from the aperture to the image side of the last lens satisfy: 120<TTL / SD<1.35.

[0093] In this exemplary embodiment, the object side surface and the image side surface of any lens of 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:

[0094]

[0095] 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); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0096] In this exemplary embodiment, the optical imaging system may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed 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.

[0097] The optical imaging system according to the above embodiment of the present invention can use multiple lenses, such as the above seven lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging system has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0098] In an exemplary embodiment, 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 seventh lens is an aspherical mirror surface. The characteristics of the aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs 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, the fifth lens, the sixth lens and the seventh 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, the fifth lens, the sixth lens and the seventh lens are all aspherical mirror surfaces.

[0099] 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 used as an example in the embodiment, the optical imaging system is not limited to including seven lenses, and the optical imaging system may also include other numbers of lenses if necessary.

[0100] Specific embodiments of the optical imaging system applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0102] Figure 1 Schematic diagram of the lens group structure of embodiment 1 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0103] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0104] As shown in Table 1, it is a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0105]

[0106]

[0107] Table 1

[0108] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging system is f=6.88 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.05 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.87 mm. Half of the maximum field of view of the optical imaging system is Semi-FOV=35.3°.

[0109]

[0110] Table 2

[0111] The optical imaging system in Example 1 satisfies:

[0112] TTL / f=1.17; wherein TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0113] f5 / f=-7.47; wherein f is the effective focal length of the optical imaging system, and f5 is the effective focal length of the fifth lens.

[0114] R2 / R1=8.01; wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0115] f6 / f7=-2.27; wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0116] (R9+R10) / (R9-R10)=2.39; wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0117] R12 / R13=1.38; wherein R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0118] (SAG11+SAG21) / (SAG11-SAG21)=1.67; wherein, SAG11 is the on-axis distance between the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens, and SAG12 is the on-axis distance between the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens.

[0119] CT1 / ET1+ET2 / CT2=4.59; wherein ET1 is the edge thickness of the first lens, ET2 is the edge thickness of the second lens, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0120] (T45+CT5+T56) / ET5=1.53; wherein T45 is the air spacing between the fourth lens and the fifth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T56 is the air spacing between the fifth lens and the sixth lens on the optical axis, and ET5 is the edge thickness of the fifth lens.

[0121] (1 / SAG52) / ImgH=-1.27; wherein SAG52 is the on-axis distance between the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0122] TTL / SD=1.31; wherein TTL is the axial distance from the object side of the first lens to the imaging surface, and SD is the distance from the aperture to the image side of the last lens.

[0123] f / EPD=1.65; wherein f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0124] V1-V2=35.7; wherein V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0125] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 3 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 1. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 and A 18 .

[0126] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 1.7160E-04 5.7072E-04 -8.7393E-04 7.8498E-04 -4.3472E-04 1.4866E-04 -3.0851E-05 3.5512E-06 S2 8.7646E-04 5.9515E-04 -1.6130E-04 9.2823E-06 3.0048E-05 -2.2095E-05 6.7837E-06 -9.8231E-07 S3 -1.4120E-02 3.9802E-03 -4.3929E-04 3.2214E-04 -2.1244E-04 6.8379E-05 -9.6977E-06 2.9140E-07 S4 -1.7856E-02 3.4663E-03 9.2441E-04 -5.2931E-04 5.3779E-04 -2.9870E-04 9.2583E-05 -1.0136E-05 S5 -4.5014E-03 -1.2636E-03 9.7529E-04 -8.8906E-05 4.9267E-04 -4.3659E-04 1.9552E-04 -4.1386E-05 S6 -4.2180E-03 -2.5780E-03 4.5830E-03 -6.7797E-03 6.9312E-03 -4.1791E-03 1.4843E-03 -2.8642E-04 S7 -2.2173E-02 -9.0228E-03 1.2960E-02 -1.6631E-02 1.3675E-02 -6.9598E-03 2.1263E-03 -3.5827E-04 S8 -2.6970E-02 -5.6886E-03 4.1502E-05 2.0201E-03 -1.5295E-03 7.6817E-04 -2.5538E-04 4.6400E-05 S9 -1.7102E-02 1.2132E-04 -2.7489E-03 1.9241E-04 8.0592E-04 -4.0245E-04 7.3280E-05 -4.4823E-06 S10 -1.7821E-02 9.3103E-03 -5.2805E-03 1.7368E-03 -2.9642E-04 1.8476E-06 7.5915E-06 -1.0594E-06 S11 -2.6593E-02 3.6021E-03 -3.5283E-03 2.8490E-03 -1.4007E-03 4.2183E-04 -7.6793E-05 7.6631E-06 S12 -4.3923E-03 -1.4916E-03 -1.4083E-03 1.2867E-03 -6.0484E-04 1.9024E-04 -4.1380E-05 6.2125E-06 S13 -3.2890E-02 1.0529E-02 -2.9565E-03 4.8707E-04 -3.3405E-05 -6.1966E-07 2.3370E-07 -1.3125E-08 S14 -1.5674E-02 2.3519E-03 -3.1224E-04 1.1191E-05 3.7882E-06 -6.6684E-07 4.8694E-08 -1.7363E-09

[0127] Table 3

[0128] Figure 2a The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 2b An astigmatism curve of the optical imaging system of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2c The distortion curve of the optical imaging system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2d The magnification chromatic aberration curve of the optical imaging system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging system provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0130] Figure 3 Schematic diagram of the lens group structure of embodiment 2 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0131] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0132] As shown in Table 4, it is a basic parameter table of the optical imaging system of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0133]

[0134] Table 4

[0135] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging system is f=7.03 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.12 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.87 mm. Half of the maximum field angle of the optical imaging system Semi-FOV=34.6°.

[0136]

[0137]

[0138] Table 5

[0139] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 2. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A30 .

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.1456E-04 -3.0434E-04 9.0034E-04 -1.5765E-03 1.9693E-03 -1.8155E-03 1.2340E-03 S2 2.2590E-04 2.6118E-04 2.1438E-03 -3.3251E-03 2.2432E-03 6.7952E-05 -1.4683E-03 S3 -1.4120E-02 4.7948E-03 -3.5904E-04 -1.2773E-03 3.3417E-03 -4.6998E-03 4.3072E-03 S4 -1.7197E-02 4.0103E-03 -3.4060E-04 1.4098E-03 -1.1389E-03 5.9229E-04 -1.9576E-04 S5 -4.9509E-03 -1.9235E-03 2.9533E-03 -3.8879E-03 7.1671E-03 -1.0664E-02 1.2779E-02 S6 -4.6657E-03 -3.0677E-04 -2.8537E-03 7.2949E-03 -1.0430E-02 1.1992E-02 -1.1779E-02 S7 -2.2803E-02 -7.0303E-03 1.0793E-02 -1.8027E-02 2.2613E-02 -2.3956E-02 2.4161E-02 S8 -2.8611E-02 -7.2983E-03 6.4265E-04 1.3617E-03 9.8210E-04 -2.8284E-03 3.1381E-03 S9 -9.4828E-03 -7.5718E-02 3.4007E-01 -8.5553E-01 1.3218E+00 -1.3703E+00 1.0003E+00 S10 -1.2314E-02 -3.5311E-05 1.6730E-02 -3.0463E-02 2.7460E-02 -1.4604E-02 4.6364E-03 S11 -2.1263E-02 7.9789E-04 1.4175E-03 -3.1610E-03 4.3532E-03 -4.0139E-03 2.5089E-03 S12 3.6391E-03 -3.7484E-03 -4.9027E-04 1.2085E-03 -7.4070E-04 2.5982E-04 -5.7704E-05 S13 -4.0331E-02 2.3056E-02 -1.6071E-02 8.9027E-03 -3.4542E-03 9.1385E-04 -1.6575E-04 S14 -3.2760E-02 3.1452E-02 -2.5896E-02 1.3398E-02 -4.5693E-03 1.0786E-03 -1.8213E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.1448E-04 2.2215E-04 -5.7433E-05 1.0326E-05 -1.2248E-06 8.6092E-08 -2.7147E-09 S2 1.3676E-03 -6.9565E-04 2.2538E-04 -4.7772E-05 6.4403E-06 -5.0245E-07 1.7296E-08 S3 -2.7473E-03 1.2463E-03 -4.0047E-04 8.8928E-05 -1.2954E-05 1.1122E-06 -4.2608E-08 S4 -9.0098E-06 9.6467E-05 -9.0474E-05 4.7589E-05 -1.5266E-05 2.7858E-06 -2.2237E-07 S5 -1.1713E-02 7.9235E-03 -3.8502E-03 1.3016E-03 -2.8996E-04 3.8210E-05 -2.2546E-06 S6 9.8520E-03 -6.6310E-03 3.3665E-03 -1.2147E-03 2.9062E-04 -4.1044E-05 2.5766E-06 S7 -2.2449E-02 1.7019E-02 -9.5736E-03 3.7499E-03 -9.5771E-04 1.4274E-04 -9.3988E-06 S8 -2.3842E-03 1.3134E-03 -5.1859E-04 1.4180E-04 -2.5282E-05 2.6242E-06 -1.1946E-07 S9 -5.2627E-01 2.0072E-01 -5.5017E-02 1.0562E-02 -1.3478E-03 1.0265E-04 -3.5304E-06 S10 -7.3763E-04 -2.8269E-05 4.1069E-05 -9.2805E-06 1.0785E-06 -6.6638E-08 1.7365E-09 S11 -1.0826E-03 3.2568E-04 -6.8131E-05 9.7089E-06 -8.9772E-07 4.8490E-08 -1.1599E-09 S12 8.3282E-06 -7.6055E-07 3.9071E-08 -6.0638E-10 -3.9237E-11 1.8568E-12 -1.6978E-14 S13 2.0848E-05 -1.8219E-06 1.0890E-07 -4.2594E-09 9.8655E-11 -1.0408E-12 5.1131E-16 S14 2.2398E-05 -2.0141E-06 1.3115E-07 -6.0200E-09 1.8462E-10 -3.3923E-12 2.8213E-14

[0141] Table 6

[0142] Figure 4a The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b An astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4c The distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4d The magnification chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4d It can be seen from the figure that the optical imaging system provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0144] Figure 5 Schematic diagram of the lens group structure of embodiment 3 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0145] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0146] As shown in Table 7, it is a basic parameter table of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0147]

[0148]

[0149] Table 7

[0150] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging system is f=6.74 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.89, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.87 mm.

[0151] Half of the maximum field of view of the optical imaging system is Semi-FOV = 35.9°.

[0152]

[0153] Table 8

[0154] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 9 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 3. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0155] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -4.6923E-05 7.8369E-04 -6.5696E-04 1.9393E-04 6.2775E-05 -6.8340E-05 2.1803E-05 -3.1982E-06 1.8075E-07 S2 7.7556E-04 1.7210E-03 -3.3888E-03 3.9292E-03 -2.5565E-03 9.6689E-04 -2.1118E-04 2.4629E-05 -1.1846E-06 S3 -1.4263E-02 5.7107E-03 -4.6235E-03 5.3811E-03 -3.7001E-03 1.4895E-03 -3.4739E-04 4.3479E-05 -2.2581E-06 S4 -1.7953E-02 3.3539E-03 1.3865E-03 -1.3576E-03 1.4250E-03 -9.0483E-04 3.4604E-04 -6.9006E-05 5.8108E-06 S5 -4.7084E-03 -9.8727E-04 5.5678E-04 3.4837E-04 2.2197E-04 -3.1076E-04 1.5215E-04 -3.2802E-05 2.8371E-06 S6 -3.8336E-03 -1.9648E-03 3.2973E-03 -5.1637E-03 5.3768E-03 -3.0907E-03 9.8840E-04 -1.6029E-04 9.4509E-06 S7 -2.2296E-02 -9.1775E-03 1.2848E-02 -1.6387E-02 1.3365E-02 -6.6570E-03 1.9575E-03 -3.0875E-04 1.9451E-05 S8 -2.6418E-02 -5.9075E-03 -3.3129E-04 2.6359E-03 -2.1369E-03 1.0958E-03 -3.4442E-04 5.6449E-05 -3.4448E-06 S9 -1.7546E-02 -1.3688E-03 4.4637E-04 -3.2216E-04 -6.7186E-04 7.6148E-04 -3.1930E-04 6.0292E-05 -4.2870E-06 S10 -1.8409E-02 4.4599E-03 2.0408E-03 -3.1250E-03 1.5830E-03 -4.5117E-04 7.4843E-05 -6.6832E-06 2.4902E-07 S11 -2.0070E-02 3.4590E-03 -3.8530E-03 2.6083E-03 -1.0780E-03 2.7996E-04 -4.4854E-05 4.0025E-06 -1.4964E-07 S12 8.8968E-03 -3.7734E-03 -7.9754E-04 1.0430E-03 -5.3254E-04 1.7721E-04 -4.0172E-05 6.2135E-06 -6.4235E-07 S13 -3.2226E-02 9.6392E-03 -2.4606E-03 3.6777E-04 -1.9365E-05 -1.3309E-06 2.2970E-07 -1.1315E-08 1.9787E-10 S14 -1.7491E-02 2.6778E-03 -1.6135E-04 -6.1610E-05 1.6792E-05 -1.9084E-06 1.1534E-07 -3.6294E-09 4.6925E-11

[0156] Table 9

[0157] Figure 6a The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b An astigmatism curve of the optical imaging system of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6c The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6d The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6d It can be seen from the figure that the optical imaging system provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0159] Figure 7Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0160] 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 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 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0161] As shown in Table 10, it is a basic parameter table of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0162]

[0163] Table 10

[0164] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging system is f=6.34 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.50, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.88 mm. Half of the maximum field angle of the optical imaging system Semi-FOV=36.8°.

[0165]

[0166] Table 11

[0167] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 12 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 4. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A16 , A 18 and A 20 .

[0168] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.3754E-04 5.9661E-04 -7.4900E-04 5.8440E-04 -3.0158E-04 1.0098E-04 -2.1208E-05 2.5178E-06 -1.2760E-07 S2 1.5520E-03 7.1109E-04 -9.9329E-04 3.8335E-04 5.7024E-05 -1.0496E-04 3.9698E-05 -6.7901E-06 4.5023E-07 S3 -1.3030E-02 5.0240E-03 -1.9843E-03 3.7154E-04 5.5277E-04 -4.8304E-04 1.7504E-04 -3.1204E-05 2.2280E-06 S4 -1.8056E-02 5.0950E-03 -1.1017E-03 -2.2953E-04 1.2220E-03 -8.3848E-04 2.7781E-04 -4.0620E-05 1.6333E-06 S5 -3.9991E-03 -4.1430E-03 1.2010E-02 -2.1136E-02 2.2641E-02 -1.4375E-02 5.4661E-03 -1.1451E-03 1.0224E-04 S6 -2.9349E-03 2.5506E-04 -4.8245E-03 7.0925E-03 -5.6625E-03 2.6274E-03 -5.7450E-04 1.3983E-05 9.8804E-06 S7 -2.3129E-02 -1.0387E-02 1.3141E-02 -1.7217E-02 1.4468E-02 -7.5368E-03 2.3799E-03 -4.2743E-04 3.4033E-05 S8 -2.3051E-02 -1.2419E-02 6.3619E-03 -4.4023E-03 3.7370E-03 -2.1859E-03 7.9057E-04 -1.6351E-04 1.4850E-05 S9 -1.4080E-02 -6.9199E-03 2.8159E-03 -1.5096E-03 3.5561E-04 1.7374E-04 -1.2703E-04 2.5477E-05 -1.5806E-06 S10 -1.8109E-02 2.5108E-03 8.4351E-04 -1.4652E-03 8.3486E-04 -2.6247E-04 4.5490E-05 -4.0167E-06 1.4101E-07 S11 -1.4137E-02 1.8269E-03 -3.8376E-03 2.6715E-03 -1.0828E-03 2.7414E-04 -4.2731E-05 3.7087E-06 -1.3507E-07 S12 1.2711E-02 -5.9277E-03 3.1759E-03 -2.4079E-03 1.0996E-03 -2.8819E-04 4.2279E-05 -2.4872E-06 -1.9995E-07 S13 -6.2283E-02 2.9400E-02 -1.0711E-02 2.6227E-03 -3.9871E-04 3.7655E-05 -2.1685E-06 7.0232E-08 -9.8795E-10 S14 -2.6011E-02 8.2203E-03 -2.2170E-03 4.1565E-04 -5.3686E-05 4.6813E-06 -2.6301E-07 8.5494E-09 -1.2107E-10

[0169] Table 12

[0170] Figure 8a The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8b An astigmatism curve of the optical imaging system of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8c The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8d The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8d It can be seen from the figure that the optical imaging system provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0172] Fig. 9 Schematic diagram of the lens group structure of embodiment 5 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0173] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0174] As shown in Table 13, it is a basic parameter table of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0175]

[0176] Table 13

[0177] As shown in Table 14, in Example 5, the total effective focal length f of the optical imaging system is 6.85 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.00, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.88 mm. Half of the maximum field angle Semi-FOV of the optical imaging system is 34.6°.

[0178]

[0179]

[0180] Table 14

[0181] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 15 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 5. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0182] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -3.2605E-04 1.5344E-03 -2.1217E-03 1.7458E-03 -9.0255E-04 2.9376E-04 -5.8594E-05 6.5293E-06 -3.1311E-07 S2 1.0235E-03 2.4292E-04 2.5166E-04 -4.3875E-04 3.4504E-04 -1.5638E-04 4.0440E-05 -5.5145E-06 3.0471E-07 S3 -1.3828E-02 3.9673E-03 -4.7526E-04 2.2065E-04 -6.5217E-05 -2.3768E-05 2.0861E-05 -4.8916E-06 3.8826E-07 S4 -1.7566E-02 3.4748E-03 5.1405E-04 3.5829E-04 -6.9644E-04 6.2822E-04 -2.9754E-04 7.7329E-05 -8.3431E-06 S5 -4.3803E-03 -8.5556E-04 2.4242E-04 3.0503E-04 4.7686E-04 -5.3033E-04 2.5315E-04 -5.5996E-05 4.8908E-06 S6 -3.8850E-03 -3.2236E-03 4.8180E-03 -6.3656E-03 5.9413E-03 -3.2897E-03 1.0786E-03 -1.9222E-04 1.4378E-05 S7 -2.2544E-02 -9.0781E-03 1.2591E-02 -1.6634E-02 1.4088E-02 -7.3480E-03 2.2931E-03 -3.9460E-04 2.8467E-05 S8 -2.5361E-02 -8.2831E-03 2.1984E-03 -9.4903E-05 3.1219E-04 -2.5815E-04 8.4390E-05 -1.5381E-05 1.3801E-06 S9 -1.7171E-02 2.4695E-03 -8.6586E-03 6.4219E-03 -2.7790E-03 8.4963E-04 -1.9099E-04 2.5933E-05 -1.4648E-06 S10 -1.8370E-02 9.5291E-03 -6.9607E-03 3.4272E-03 -1.1214E-03 2.3616E-04 -3.2244E-05 2.7016E-06 -1.0443E-07 S11 -1.9681E-02 3.1276E-03 -4.1273E-03 2.9819E-03 -1.2866E-03 3.4420E-04 -5.6281E-05 5.1013E-06 -1.9360E-07 S12 6.8230E-03 -4.2765E-03 4.8312E-04 -1.1992E-04 6.5429E-05 -1.7935E-05 2.5540E-06 -1.6338E-07 -1.4796E-09 S13 -3.8990E-02 1.4342E-02 -4.6953E-03 9.7208E-04 -1.1089E-04 6.6650E-06 -1.6870E-07 -9.4985E-10 9.1946E-11 S14 -2.2903E-02 6.1735E-03 -1.5013E-03 2.4519E-04 -2.6065E-05 1.7891E-06 -7.7112E-08 1.9072E-09 -2.0579E-11

[0183] Table 15

[0184] Fig.10a The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.10b An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.10c The distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.10d The magnification chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10d It can be seen from the figure that the optical imaging system provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0186] Fig.11Schematic diagram of the lens group structure of embodiment 6 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0187] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0188] As shown in Table 16, it is a basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0189]

[0190] Table 16

[0191] As shown in Table 17, in Example 6, the total effective focal length f of the optical imaging system is 7.27 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.19, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.87 mm. Half of the maximum field angle Semi-FOV of the optical imaging system is 33.3°.

[0192]

[0193]

[0194] Table 17

[0195] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 18 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 6. 4 , A 6 , A 8 , A 10, A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0196] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.3021E-04 -4.7459E-04 1.1683E-03 -1.9651E-03 2.4313E-03 -2.2418E-03 1.5269E-03 S2 -2.3616E-04 2.2926E-03 -3.1013E-03 4.9185E-03 -6.0305E-03 5.3833E-03 -3.4959E-03 S3 -1.4026E-02 4.7616E-03 -3.1106E-04 -1.2922E-03 3.2573E-03 -4.5230E-03 4.1149E-03 S4 -1.7178E-02 4.0561E-03 -3.2402E-04 1.3811E-03 -1.0993E-03 4.8146E-04 -6.7934E-06 S5 -4.9870E-03 -2.0532E-03 3.1956E-03 -4.1060E-03 7.2231E-03 -1.0382E-02 1.2168E-02 S6 -4.8833E-03 -1.1240E-04 -3.1497E-03 7.6131E-03 -1.0141E-02 1.0311E-02 -8.6046E-03 S7 -2.2739E-02 -7.2953E-03 1.1435E-02 -1.8943E-02 2.3918E-02 -2.5758E-02 2.6305E-02 S8 -2.8611E-02 -7.3597E-03 3.8844E-04 1.7327E-03 8.4137E-04 -2.9161E-03 3.3000E-03 S9 -1.1085E-02 -3.2987E-02 1.0383E-01 -2.4471E-01 3.8070E-01 -4.1066E-01 3.1736E-01 S10 -1.1598E-02 4.1300E-03 3.2276E-03 -1.1772E-02 1.3818E-02 -9.8403E-03 4.8581E-03 S11 -2.3196E-02 -4.9338E-04 5.1288E-03 -9.0461E-03 1.0616E-02 -8.7335E-03 5.0883E-03 S12 -5.2370E-04 -3.0115E-03 -6.3108E-04 1.2491E-03 -7.5465E-04 2.6366E-04 -5.8446E-05 S13 -4.0407E-02 2.2109E-02 -1.4868E-02 8.0845E-03 -3.0947E-03 8.0380E-04 -1.4161E-04 S14 -2.3888E-02 1.1607E-02 -7.5975E-03 3.7537E-03 -1.2900E-03 3.1170E-04 -5.4119E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 -7.6149E-04 2.7548E-04 -7.1218E-05 1.2795E-05 -1.5156E-06 1.0630E-07 -3.3420E-09 S2 1.6474E-03 -5.5862E-04 1.3406E-04 -2.2076E-05 2.3556E-06 -1.4531E-07 3.8780E-09 S3 -2.6116E-03 1.1805E-03 -3.7827E-04 8.3792E-05 -1.2178E-05 1.0433E-06 -3.9889E-08 S4 -2.1122E-04 2.4214E-04 -1.6303E-04 7.2283E-05 -2.0730E-05 3.4899E-06 -2.6201E-07 S5 -1.1017E-02 7.4028E-03 -3.5818E-03 1.2067E-03 -2.6792E-04 3.5178E-05 -2.0674E-06 S6 6.2077E-03 -3.8101E-03 1.8563E-03 -6.6179E-04 1.5845E-04 -2.2495E-05 1.4211E-06 S7 -2.4508E-02 1.8537E-02 -1.0389E-02 4.0518E-03 -1.0295E-03 1.5246E-04 -9.9591E-06 S8 -2.5199E-03 1.3939E-03 -5.5354E-04 1.5244E-04 -2.7411E-05 2.8746E-06 -1.3257E-07 S9 -1.7806E-01 7.2558E-02 -2.1228E-02 4.3402E-03 -5.8816E-04 4.7423E-05 -1.7207E-06 S10 -1.7548E-03 4.7163E-04 -9.3584E-05 1.3310E-05 -1.2806E-06 7.4423E-08 -1.9668E-09 S11 -2.1123E-03 6.2455E-04 -1.3024E-04 1.8681E-05 -1.7502E-06 9.6268E-08 -2.3535E-09 S12 8.4201E-06 -7.6579E-07 3.8754E-08 -5.2065E-10 -4.6220E-11 2.1292E-12 -2.1249E-14 S13 1.7034E-05 -1.3907E-06 7.4521E-08 -2.3819E-09 3.2058E-11 3.3656E-13 -1.2046E-14 S14 6.8465E-06 -6.3247E-07 4.2201E-08 -1.9788E-09 6.1793E-11 -1.1527E-12 9.7096E-15

[0197] Table 18

[0198] Fig.12a The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 12b An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.12c The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12d The magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12d It can be seen from the figure that the optical imaging system provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0200] Fig.13 Schematic diagram of the lens group structure of embodiment 7 of the optical imaging system of the present invention. The optical imaging system includes, in order 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, a filter E8 and an imaging surface S17.

[0201] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has negative 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 light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0202] As shown in Table 19, it is a basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0203]

[0204] Table 19

[0205] As shown in Table 20, in Example 7, the total effective focal length of the optical imaging system is f=7.27 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.19, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=4.87 mm. Half of the maximum field angle of the optical imaging system Semi-FOV=33.3°.

[0206]

[0207] Table 20

[0208] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 21 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 7. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0209] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -3.2605E-04 1.5344E-03 -2.1217E-03 1.7458E-03 -9.0255E-04 2.9376E-04 -5.8594E-05 6.5293E-06 -3.1311E-07 S2 1.0235E-03 2.4292E-04 2.5166E-04 -4.3875E-04 3.4504E-04 -1.5638E-04 4.0440E-05 -5.5145E-06 3.0471E-07 S3 -1.3828E-02 3.9673E-03 -4.7526E-04 2.2065E-04 -6.5217E-05 -2.3768E-05 2.0861E-05 -4.8916E-06 3.8826E-07 S4 -1.7566E-02 3.4748E-03 5.1405E-04 3.5829E-04 -6.9644E-04 6.2822E-04 -2.9754E-04 7.7329E-05 -8.3431E-06 S5 -4.3803E-03 -8.5556E-04 2.4242E-04 3.0503E-04 4.7686E-04 -5.3033E-04 2.5315E-04 -5.5996E-05 4.8908E-06 S6 -3.8850E-03 -3.2236E-03 4.8180E-03 -6.3656E-03 5.9413E-03 -3.2897E-03 1.0786E-03 -1.9222E-04 1.4378E-05 S7 -2.2544E-02 -9.0781E-03 1.2591E-02 -1.6634E-02 1.4088E-02 -7.3480E-03 2.2931E-03 -3.9460E-04 2.8467E-05 S8 -2.5361E-02 -8.2831E-03 2.1984E-03 -9.4903E-05 3.1219E-04 -2.5815E-04 8.4390E-05 -1.5381E-05 1.3801E-06 S9 -1.7171E-02 2.4695E-03 -8.6586E-03 6.4219E-03 -2.7790E-03 8.4963E-04 -1.9099E-04 2.5933E-05 -1.4648E-06 S10 -1.8370E-02 9.5291E-03 -6.9607E-03 3.4272E-03 -1.1214E-03 2.3616E-04 -3.2244E-05 2.7016E-06 -1.0443E-07 S11 -1.9681E-02 3.1276E-03 -4.1273E-03 2.9819E-03 -1.2866E-03 3.4420E-04 -5.6281E-05 5.1013E-06 -1.9360E-07 S12 6.8230E-03 -4.2765E-03 4.8312E-04 -1.1992E-04 6.5429E-05 -1.7935E-05 2.5540E-06 -1.6338E-07 -1.4796E-09 S13 -3.8990E-02 1.4342E-02 -4.6953E-03 9.7208E-04 -1.1089E-04 6.6650E-06 -1.6870E-07 -9.4985E-10 9.1946E-11 S14 -2.2903E-02 6.1735E-03 -1.5013E-03 2.4519E-04 -2.6065E-05 1.7891E-06 -7.7112E-08 1.9072E-09 -2.0579E-11

[0210] Table 21

[0211] Fig.14a The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.14b An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.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.14d The magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 14a to 14d It can be seen from the figure that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0212] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging system, It is characterized in that The optical imaging system has seven lenses with optical power, and the optical imaging system includes, in order from the object side to the image side along the optical axis: Aperture; 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; The third lens has positive power, its object side surface is convex and its image side surface is concave; a fourth lens having positive or negative power, whose object-side surface is concave and whose image-side surface is convex; A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; The seventh lens element has a negative optical power, and its object side surface is concave and its image side surface is concave; Wherein, the effective focal length f of the optical imaging system and the effective focal length f5 of the fifth lens satisfy: -9.28≤f5 / f≤-6.99; The effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: 1.55≤f / EPD≤1.65; 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: 7.21≤R2 / R1≤8.

28.

2. The optical imaging system according to claim 1, It is characterized in that The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: 1.13≤TTL / f≤1.

18.

3. The optical imaging system according to claim 1, It is characterized in that Half of the maximum field of view Semi-FOV of the optical imaging system satisfies: 33.3°≤Semi-FOV≤36.8°.

4. The optical imaging system according to claim 1, It is characterized in that A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens: 0.75≤R12 / R13≤5.

77.

5. The optical imaging system according to claim 1, It is characterized in that An effective focal length f6 of the sixth lens and an effective focal length f7 of the seventh lens satisfy: -3.59≤f6 / f7≤-1.

72.

6. The optical imaging system according to claim 1, It is characterized in that The on-axis distance SAG11 between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens and the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens satisfy: 1.67≤(SAG11+SAG21) / (SAG11-SAG21)≤1.

84.

7. The optical imaging system according to claim 1, It is characterized in that The edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 4.59≤CT1 / ET1+ET2 / CT2<6.

1.

8. The optical imaging system according to claim 1, It is characterized in that An air interval T45 between the fourth lens and the fifth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, an air interval T56 between the fifth lens and the sixth lens on the optical axis and an edge thickness ET5 of the fifth lens satisfy: 1.5<(T45+CT5+T56) / ET5≤1.

84.

9. The optical imaging system according to claim 1, It is characterized in that 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: 2.17≤(R9+R10) / (R9-R10)≤3.

3.

10. The optical imaging system according to claim 1, It is characterized in that The on-axis distance SAG52 between the intersection of the image side surface of the fifth lens and the optical axis to the effective radius vertex of the image side surface of the fifth lens and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: -1.54≤(1 / SAG52) / ImgH≤-0.

87.

11. The optical imaging system according to claim 1, It is characterized in that The Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2=35.

7.

12. The optical imaging system according to claim 1, It is characterized in that The Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: V4=V5.

13. The optical imaging system according to claim 1, It is characterized in that The axial distance TTL from the object side of the first lens to the imaging surface and the distance SD from the aperture to the image side of the last lens satisfy: 1.27≤TTL / SD≤1.34.

Images