Optical imaging system

Abstract

The application discloses an optical imaging system, which comprises a first lens, a second lens, a third lens with negative focal length, a fourth lens, a fifth lens with positive focal length, a sixth lens with positive focal length and a seventh lens in sequence from the object side to the image side along the optical axis, wherein the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a concave surface; and the half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging system ImgH, the aperture number Fno of the optical imaging system, the distance BFL between the image side surface of the seventh lens and the imaging surface on the optical axis, the combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R9 of the object side surface of the fifth lens, the curvature radius R12 of the image side surface of the sixth lens, the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis and the maximum half field angle Semi-FOV of the optical imaging system satisfy the following conditions: 5.0mm<ImgHxFno / 2<9.2mm; -1.0<(BFL-f56) / (R9-R12)<0; and 3.0mm<TTL / Fnoxtan(Semi-FOV)<5.0mm.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of science and technology, modern information technologies such as Internet of Things technology, cloud computing technology and big data technology are deeply integrated with industry. In order to successfully sell products to consumers, various portable electronic devices are increasingly used in various fields, so that portable electronic products have developed rapidly in recent years, and the market demand for camera lenses suitable for portable electronic products has also gradually increased. In order to truly reflect product information, the performance requirements of the optical system of the mounted lens are also increasing.

[0003] At present, the requirement of continuously improving the performance of the optical imaging system and continuously innovating the structure to seek breakthroughs has become a good development direction for many lens manufacturers to improve their competitiveness. It has practical significance to design a small seven-piece optical imaging system with a large image surface, a long back focus, a low sensitivity and a good imaging quality. SUMMARY

[0004] The present application provides an optical imaging system, which comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens with negative refractive power, a fourth lens, a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens, wherein the image side surface of the fifth lens is concave; the object side surface of the sixth lens is concave; and half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging system ImgH, the aperture number Fno of the optical imaging system, the distance BFL on the optical axis from the image side surface of the seventh lens to the imaging surface, the combined focal length f56 of the fifth lens and the sixth lens, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R12 of the image side surface of the sixth lens, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface, and the maximum half field angle Semi-FOV of the optical imaging system satisfy: 5.0mm<ImgHxFno / 2<9.2mm; -1.0<(BFL-f56) / (R9-R12)<0; and 3.0mm<TTL / Fnoxtan(Semi-FOV)<5.0mm.

[0005] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, and the maximum half field angle Semi-FOV of the optical imaging system satisfy: 29.5mm<(TTL+TD) / tan(Semi-FOV)<40.5mm.

[0006] In one embodiment, the effective focal length f of the optical imaging system and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy: 1.0 < f / f3456 < 2.8.

[0007] In one embodiment, the effective focal length f of the optical imaging system, the effective focal length f7 of the seventh lens and the effective focal length f5 of the fifth lens satisfy: 0.5 < (f-f7) / f5 < 3.7.

[0008] In one embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R11 of the object side surface of the sixth lens, the distance SAG61 on the optical axis 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 satisfy: -5.8 < (R3-R11) / SAG61 < -3.5.

[0009] In one embodiment, the combined focal length f56 of the fifth lens and the sixth lens, the central thickness CT5 on the optical axis of the fifth lens and the central thickness CT6 on the optical axis of the sixth lens satisfy: 2.2 < f56 / (CT5+CT6) < 5.5.

[0010] In one embodiment, the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R9 of the object side surface of the fifth lens, the air gap T56 on the optical axis of the fifth lens and the sixth lens satisfy: -9.5 < (R11-R9) / T56 < -2.8.

[0011] In one embodiment, the air gap T56 on the optical axis of the fifth lens and the sixth lens, the air gap T45 on the optical axis of the fourth lens and the fifth lens and the central thickness CT5 on the optical axis of the fifth lens satisfy: 0.5 < (T56+T45) / CT5 < 2.5.

[0012] In one embodiment, the central thickness CT7 on the optical axis of the seventh lens, the central thickness CT6 on the optical axis of the sixth lens, the central thickness CT5 on the optical axis of the fifth lens and the central thickness CT3 on the optical axis of the third lens satisfy: 0.4 < (CT7+CT6) / (CT5+CT3) < 1.8.

[0013] In one embodiment, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, the distance BFL on the optical axis from the image side surface of the seventh lens to the imaging surface and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the first lens to the seventh lens satisfy: 0.5 < |TD / (BFL-∑AT)| / 3 < 3.5.

[0014] In one embodiment, the maximum effective radius DT71 of the object side surface of the seventh lens, the maximum effective radius DT61 of the object side surface of the sixth lens, the maximum effective radius DT41 of the object side surface of the fourth lens, and the maximum effective radius DT11 of the object side surface of the first lens satisfy: -6.7 < (DT71-DT61) / (DT41-DT11) < -1.0.

[0015] In one embodiment, the air gap T23 of the second lens and the third lens on the optical axis, the distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens on the optical axis, and the distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens on the optical axis satisfy: 1.5 < T23 / (SAG21+SAG31) < 5.7.

[0016] In one embodiment, the 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 on the optical axis, the 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 on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: -3.5 < (SAG61-SAG51) / CT6 < -0.5.

[0017] In one embodiment, the sum ∑ET of the edge thicknesses at the maximum effective radii of all the lenses of the first lens to the seventh lens, and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses of the first lens to the seventh lens satisfy: 1.0 < ∑ET / ∑AT < 2.0.

[0018] In one embodiment, the edge thickness ET7 at the maximum effective radius of the seventh lens and the edge thickness ET5 at the maximum effective radius of the fifth lens satisfy: 1.2 < ET7 / ET5 < 3.7.

[0019] In one embodiment, the refractive index N6 of the sixth lens, the refractive index N7 of the seventh lens, the edge thickness ET6 at the maximum effective radius of the sixth lens, and the edge thickness ET7 at the maximum effective radius of the seventh lens satisfy: 0.8 < (N6+N7) / (ET6+ET7) < 2.2.

[0020] In one embodiment, the refractive index N3 of the third lens, the refractive index N5 of the fifth lens, the 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 on the optical axis, and the distance SAG52 from 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 on the optical axis satisfy: 6.0 < (N3+N5) / (SAG51-SAG52) < 10.8.

[0021] The optical imaging system of the present application adopts seven lenses, adopts a compact combination, sets the image side surface of the fifth lens as a concave surface, sets the object side surface of the sixth lens as a concave surface, and reasonably allocates the refractive power of each lens, effectively balances and controls the low-order aberrations of the system, so that the optical imaging system can meet the optical performance of a large image surface and a long back focal length, and has low sensitivity and good imaging quality; the reasonable setting of the combination focal length of the fifth lens and the sixth lens, and the radii of curvature of the object side surface of the fifth lens and the image side surface of the sixth lens is beneficial to the formation of the long back focal length feature; by controlling the field of view angle, the total length of the system, and the aperture number, the light entering the optical imaging system is stably output after refraction by the lens, the reasonable allocation between the lens TTL and the back focal length is ensured, the long back focal length feature is maintained, and the imaging range of the system is effectively controlled. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0024] Figures 2A to 2D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 1 are shown respectively;

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

[0026] Figures 4A to 4D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 2 are shown respectively;

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

[0028] Figures 6A to 6D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 3 are shown respectively;

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

[0030] Figures 8A to 8D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 4 are shown respectively;

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

[0032] Figures 10A to 10D On-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 5 are shown, respectively;

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

[0034] Figures 12A to 12D On-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 6 are shown, respectively;

[0035] Figure 13 A structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0036] Figures 14A to 14D On-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 7 are shown, respectively;

[0037] Figure 15 A structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0038] Figures 16A to 16D On-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 8 are shown, respectively;

[0039] Figure 17 A structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown; and

[0040] Figures 18A to 18D On-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the optical imaging system of Embodiment 9 are shown, respectively. DETAILED DESCRIPTION

[0041] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the drawings. It is to be understood that these detailed descriptions are merely exemplary of the application and are not intended to limit the scope of the application in any way. Throughout this document, same reference numerals are used to refer to same elements in a cross-sectionally identical manner. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0042] It should be noted that in the present specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0043] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0044] In this context, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, 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 specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0045] It should also be understood that the use of the terms "including", "including have", "have", "contain" and / or "contain have", when used in this specification, means that there are present the stated features, elements and / or components, but does 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 list of features and not the individual elements of the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0046] Unless otherwise defined, all terms used in this document, including technical terms and scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0047] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0048] The features, principles and other aspects of the present application are described in detail below.

[0049] The optical imaging system according to the exemplary embodiments of the present application can include seven lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven lenses are arranged in order along an optical axis from an object side to an image side. Any two adjacent lenses among the first to seventh lenses can have a separation distance therebetween.

[0050] In the example embodiment, the first lens can have positive refractive power, the second lens can have negative refractive power, the third lens can have negative refractive power, the fourth lens can have positive or negative refractive power, the fifth lens can have positive refractive power, the sixth lens can have positive refractive power, and the seventh lens can have negative refractive power. The image side surface of the fifth lens is concave, the object side surface of the sixth lens is concave, the seven lenses are combined in a compact manner, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is concave, and the refractive power of each lens is reasonably distributed, so that the optical imaging system can meet the optical performance of a large image surface and a long back focal length, and has low sensitivity and good imaging quality.

[0051] In exemplary implementations, the optical imaging system according to the present application can satisfy: 5.0mm < ImgH x Fno / 2 < 9.2mm; -1.0 < (BFL-f56) / (R9-R12) < 0 and 3.0mm < TTL / Fno x tan(Semi-FOV) < 5.0mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, Fno is the F-number of the optical imaging system, BFL is the distance from the image side surface of the seventh lens to the imaging plane on the optical axis, f56 is the combined focal length of the fifth lens and the sixth lens, R9 is the radius of curvature of the object side surface of the fifth lens, R12 is the radius of curvature of the image side surface of the sixth lens, TTL is the distance from the object side surface of the first lens to the imaging plane on the optical axis, and Semi-FOV is the maximum half field angle of the optical imaging system. More specifically, ImgH and Fno can further satisfy: 5.4mm < ImgH x Fno / 2 < 8.7mm; more specifically, BFL, f56, R9 and R12 can further satisfy: -0.3 < (BFL-f56) / (R9-R12) < 0; more specifically, TTL, Fno and Semi-FOV can further satisfy: 3.7mm < TTL / Fno x tan(Semi-FOV) < 4.6mm. By reasonably controlling the positive and negative distribution of the refractive power, the radius of curvature, the amount of light entering, and the distance from the object side surface of the first lens to the imaging plane on the optical axis of each component of the optical imaging system, the low-order aberrations of the system are effectively balanced and controlled. Specifically, satisfying 5.0mm < ImgH x Fno / 2 < 9.2mm is conducive to the structural configuration of the optical imaging system and realizes the design of a large imaging surface. Satisfying -1.0 < (BFL-f56) / (R9-R12) < 0 is conducive to the formation of a long back focal length feature by reasonably setting the combined focal length of the fifth lens and the sixth lens and the radius of curvature of the object side surface of the fifth lens and the radius of curvature of the image side surface of the sixth lens. Satisfying 3.0mm < TTL / Fno x tan(Semi-FOV) < 5.0mm ensures the stable output of light entering the optical imaging system after refraction by the lens, ensures a reasonable distribution between the lens TTL and the back focal length, maintains the long back focal length feature, and effectively controls the imaging range of the system.

[0052] In exemplary implementations, half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, ImgH, can be in a range of 5.9mm to 8.3mm, for example.

[0053] In exemplary implementations, the maximum half field angle of the optical imaging system, Semi-FOV, can be in a range of 29.7° to 33.0°, for example.

[0054] In exemplary embodiments, the Fno of the optical imaging system may, for example, be in a range from 1.8 to 2.1. Reasonably setting the Fno is conducive to making the optical imaging system have a larger aperture and improving the overall brightness of imaging.

[0055] In exemplary embodiments, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface may, for example, be in a range from 11.8 mm to 14.8 mm.

[0056] In exemplary embodiments, the optical imaging system according to the present application further comprises a diaphragm arranged on the object side surface of the first lens.

[0057] In exemplary embodiments, the optical imaging system according to the present application may satisfy: 29.5 mm < (TTL + TD) / tan (Semi-FOV) < 40.5 mm, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, and Semi-FOV is the maximum half field of view angle of the optical imaging system. More specifically, TTL, TD and Semi-FOV may further satisfy: 30.0 mm < (TTL + TD) / tan (Semi-FOV) < 37.2 mm. Satisfying 29.5 mm < (TTL + TD) / tan (Semi-FOV) < 40.5 mm, by controlling the system length and the field of view angle, can make the balance between the edge thickness of each lens and the center thickness of the lens stable, and ensure the field of view range and back focal length of the optical imaging system, while improving the space utilization and reducing the difficulty of lens processing and assembly.

[0058] In exemplary embodiments, the optical imaging system according to the present application may satisfy: 1.0 < f / f3456 < 2.8, where f is the effective focal length of the optical imaging system, and f3456 is the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens. More specifically, f and f3456 may further satisfy: 1.5 < f / f3456 < 2.3. Satisfying 1.0 < f / f3456 < 2.8, by reasonably configuring the optical power of the optical imaging system, can effectively correct the distortion of the image surface in the near-axis range, thereby improving the imaging quality of the optical imaging system.

[0059] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 0.5 < (f-f7) / f5 < 3.7, where f is the effective focal length of the optical imaging system, f7 is the effective focal length of the seventh lens, and f5 is the effective focal length of the fifth lens. More specifically, f, f7 and f5 can further satisfy: 1.2 < (f-f7) / f5 < 3.3. Satisfying 0.5 < (f-f7) / f5 < 3.7 is conducive to controlling the refractive power of the rear section of the imaging lens within a small range, which can reduce the deflection angle of light rays, thereby reducing the sensitivity of the imaging lens.

[0060] In exemplary embodiments, the optical imaging system according to the present application can satisfy: -5.8 < (R3-R11) / SAG61 < -3.5, where R3 is the radius of curvature of the object side surface of the second lens, R11 is the radius of curvature of the object side surface of the sixth lens, and SAG61 is the distance 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 on the optical axis. More specifically, R3, R11 and SAG61 can further satisfy: -5.2 < (R3-R11) / SAG61 < -4.0. Satisfying -5.8 < (R3-R11) / SAG61 < -3.5 is conducive to effectively eliminating the spherical aberration of the optical imaging system, thereby obtaining a high-definition image.

[0061] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 2.2 < f56 / (CT5+CT6) < 5.5, where f56 is the combined focal length of the fifth lens and the sixth lens, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. More specifically, f56, CT5 and CT6 can further satisfy: 2.7 < f56 / (CT5+CT6) < 4.5. Satisfying 2.2 < f56 / (CT5+CT6) < 5.5 is conducive to uniform distribution of lens size, ensuring assembly stability, and reducing aberration of the entire optical imaging system and shortening the total length of the optical imaging system.

[0062] In exemplary embodiments, the optical imaging system according to the present application can satisfy: -9.5 < (R11-R9) / T56 < -2.8, where R11 is the radius of curvature of the object side surface of the sixth lens, R9 is the radius of curvature of the object side surface of the fifth lens, and T56 is the air gap of the fifth lens and the sixth lens on the optical axis. More specifically, R11, R9 and T56 can further satisfy: -9.0 < (R11-R9) / T56 < -3.3. Satisfying -9.5 < (R11-R9) / T56 < -2.8 can effectively eliminate the spherical aberration of the optical imaging system by reasonably configuring the radii of curvature of the lenses, thereby obtaining a high-definition image.

[0063] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 0.5 < (T56+T45) / CT5 < 2.5, where T56 is the air gap of the fifth lens and the sixth lens on the optical axis, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis. More specifically, T56, T45 and CT5 can further satisfy: 1.2 < (T56+T45) / CT5 < 2.2. Satisfying 0.5 < (T56+T45) / CT5 < 2.5 can effectively adjust the sensitivity of the lens and the air gap, facilitate the field curvature adjustment in the lens production process, improve the lens design value, and improve the MTF yield.

[0064] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 0.4 < (CT7+CT6) / (CT5+CT3) < 1.8, where CT7 is the center thickness of the seventh lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT7, CT6, CT5 and CT3 can further satisfy: 0.8 < (CT7+CT6) / (CT5+CT3) < 1.4. Satisfying 0.4 < (CT7+CT6) / (CT5+CT3) < 1.8 can reasonably control the center thicknesses of the third, fifth, sixth and seventh lenses, help to uniformly distribute the lens size, ensure the assembly stability, and reduce the aberration of the entire optical imaging system and shorten the total length of the optical imaging system.

[0065] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 0.5 < |TD / (BFL-∑AT)| / 3 < 3.5, where TD is the distance from the object side of the first lens to the image side of the seventh lens on the optical axis, BFL is the distance from the image side of the seventh lens to the imaging surface on the optical axis, and ∑AT is the sum of the air gaps between any two adjacent lenses among the first lens to the seventh lens on the optical axis. More specifically, TD, BFL and ∑AT can further satisfy: 1.0 < |TD / (BFL-∑AT)| / 3 < 3.0. Satisfying 0.5 < |TD / (BFL-∑AT)| / 3 < 3.5 can help to reasonably set the total length of the lens group and the lens gap, thereby reasonably allocating the space of the overall length of the lens and reducing the sensitivity of the lens.

[0066] In exemplary embodiments, the optical imaging system according to the present application can satisfy: -6.7 < (DT71-DT61) / (DT41-DT11) < -1.0, where DT71 is the maximum effective radius of the object side surface of the seventh lens, DT61 is the maximum effective radius of the object side surface of the sixth lens, DT41 is the maximum effective radius of the object side surface of the fourth lens, and DT11 is the maximum effective radius of the object side surface of the first lens. More specifically, DT71, DT61, DT41 and DT11 can further satisfy: -6.3 < (DT71-DT61) / (DT41-DT11) < -1.5. Satisfying -6.7 < (DT71-DT61) / (DT41-DT11) < -1.0 can balance vignetting and the deflection angle of edge rays by controlling the effective radii of the lenses, effectively control the relative brightness of the edge field of view, and avoid the risk of dark corners in advance.

[0067] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 1.5 < T23 / (SAG21+SAG31) < 5.7, where T23 is the air gap of the second lens and the third lens on the optical axis, SAG21 is the distance from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens on the optical axis, and SAG31 is the distance from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens on the optical axis. More specifically, T23, SAG21 and SAG31 can further satisfy: 2.0 < T23 / (SAG21+SAG31) < 5.2. Satisfying 1.5 < T23 / (SAG21+SAG31) < 5.7 can effectively reduce the sensitivity of the first three lenses, facilitate the improvement of the central field of view peak value of the optical imaging system, and reduce the assembly difficulty.

[0068] In exemplary embodiments, the optical imaging system according to the present application can satisfy: -3.5 < (SAG61-SAG51) / CT6 < -0.5, where SAG61 is the distance 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 on the optical axis, SAG51 is the distance 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 on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. More specifically, SAG61, SAG51 and CT6 can further satisfy: -3.0 < (SAG61-SAG51) / CT6 < -1.0. Satisfying -3.5 < (SAG61-SAG51) / CT6 < -0.5 can effectively control the edge rays, improve the imaging quality of the edge field of view, and facilitate the smooth connection of the effective diameter part of the lens and the non-effective diameter part of the lens, and avoid stray light in advance.

[0069] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 1.0 <∑ET / ∑AT< 2.0, where ∑ET is the sum of the edge thicknesses of all the lenses of the first lens to the seventh lens at the maximum effective radius, and ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the seventh lens. More specifically, ∑ET and ∑AT can further satisfy: 1.2 <∑ET / ∑AT< 1.8. Satisfying 1.0 <∑ET / ∑AT< 2.0 helps to reduce the aberration of the entire optical imaging system and is conducive to uniform distribution of the lens size, ensuring assembly stability.

[0070] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 1.2 <ET7 / ET5< 3.7, where ET7 is the edge thickness of the seventh lens at the maximum effective radius, and ET5 is the edge thickness of the fifth lens at the maximum effective radius. More specifically, ET7 and ET5 can further satisfy: 1.8 <ET7 / ET5< 3.2. Satisfying 1.2 <ET7 / ET5< 3.7 can effectively control the incident angle of light at the fifth lens and the seventh lens, improving the imaging quality of the optical imaging system.

[0071] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 0.8<(N6+N7) / (ET6+ET7)<2.2, where N6 is the refractive index of the sixth lens, N7 is the refractive index of the seventh lens, ET6 is the edge thickness of the sixth lens at the maximum effective radius, and ET7 is the edge thickness of the seventh lens at the maximum effective radius. More specifically, N6, N7, ET6 and ET7 can further satisfy: 1.2<(N6+N7) / (ET6+ET7)<1.8. Satisfying 0.8<(N6+N7) / (ET6+ET7)<2.2 is conducive to improving the performance of the optical imaging system and can effectively improve the processability of the lens, which is conducive to improving the yield in the product production process.

[0072] In exemplary embodiments, the optical imaging system according to the present application can satisfy: 6.0 < (N3+N5) / (SAG51-SAG52) < 10.8, where N3 is the refractive index of the third lens, N5 is the refractive index of the fifth lens, SAG51 is the distance from the intersection of the object side of the fifth lens and the optical axis to the effective radius vertex on the optical axis of the object side of the fifth lens, and SAG52 is the distance from the intersection of the image side of the fifth lens and the optical axis to the effective radius vertex on the optical axis of the image side of the fifth lens. More specifically, N3, N5, SAG51 and SAG52 can further satisfy: 6.7 < (N3+N5) / (SAG51-SAG52) < 10.3. Satisfying 6.0 < (N3+N5) / (SAG51-SAG52) < 10.8 can help to balance the optical power of the third lens and the fifth lens and the light deflection angle of the edge of the fifth lens, and enhance the aberration correction capability of the optical imaging system.

[0073] In exemplary embodiments, the effective focal length f of the optical imaging system can be, for example, in the range of 9.8mm to 12.6mm, the focal length f1 of the first lens can be, for example, in the range of 9.8mm to 10.9mm, the focal length f2 of the second lens can be, for example, in the range of -18.4mm to -13.2mm, the focal length f3 of the third lens can be, for example, in the range of -213.0mm to -28.1mm, the focal length f4 of the fourth lens can be, for example, in the range of -67.7mm to 32.5mm, the focal length f5 of the fifth lens can be, for example, in the range of 5.4mm to 14.5mm, the focal length f6 of the sixth lens can be, for example, in the range of 7.2mm to 16.0mm, and the focal length f7 of the seventh lens can be, for example, in the range of -8.9mm to -5.8mm.

[0074] In exemplary embodiments, the optical imaging system according to the present application further comprises a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The optical imaging system according to the above embodiments of the present application can employ multiple lenses, for example, seven lenses as described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and on-axis spacing between lenses, etc., the low-order aberrations of the optical imaging system can be effectively balanced and controlled, while the sensitivity of its tolerance can be reduced, and the miniaturization of the optical imaging system can be maintained.

[0075] In the embodiments of the present application, at least one of the mirror surfaces of each of the first lens to the seventh lens is an aspherical mirror surface. The aspherical lens is characterized in that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens having 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 the distortion aberration and improving the astigmatism aberration. After the aspherical lens is used, the aberration occurring during imaging can be eliminated as much as possible, and the imaging quality is improved. Alternatively, the object side surface and the image side surface of each of the first lens to the seventh lens are aspherical mirror surfaces.

[0076] However, those skilled in the art should understand that the number of lenses constituting the optical imaging system can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although the optical imaging system is described by taking seven lenses as an example in the embodiments, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system can also include other numbers of lenses.

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

[0078] Example 1

[0079] The following refers to Figures 1 to 2D The optical imaging system according to Embodiment 1 of the present application is described. Figure 1 The structural schematic diagram of the optical imaging system according to Embodiment 1 of the present application is shown.

[0080] As Figure 1 shown, the optical imaging system sequentially includes, from the object side to the image side: a stop 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.

[0081] The first lens E1 has a positive focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0082] The second lens E2 has a negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0083] The third lens E3 has a negative focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.

[0084] The fourth lens E4 has a negative focal power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface.

[0085] The fifth lens E5 has positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface.

[0086] The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface.

[0087] The seventh lens E7 has negative refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface.

[0088] The filter E8 has an object side surface S15 and an image side surface S16. Light from an object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface S17.

[0089] In the present example, the focal length f of the optical imaging system is 12.5 mm, the total track length TTL (i.e., the distance 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 14.72 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH is 8.27 mm, the half of the maximum field of view angle of the optical imaging system is Semi-FOV is 32.93°, and the F number Fno of the optical imaging system is 2.09.

[0090] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the curvature radius, the effective focal length and the thickness are millimeters (mm).

[0091]

[0092] Table 1

[0093] 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, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0094]

[0095] wherein x is the sag of the aspherical surface at a height h along the optical axis from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, A10 and A12 of the aspherical surfaces S1-S14 that can be used in Example 1 are given in Table 2-1 and Table 2-2 below. 10 12 14 16 18 20 22 24 ​​​​​​​A 26 A 28 and A 30 .

[0096]

[0097]

[0098] Table 2-1

[0099] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -9.06E-04 -1.95E-04 3.11E-04 3.21E-04 1.05E-04 2.17E-05 0.00E+00 S2 1.49E-03 -1.15E-03 -1.25E-03 4.63E-05 5.62E-04 1.79E-04 0.00E+00 S3 1.24E-03 -3.55E-04 -8.46E-04 -2.38E-04 2.57E-04 1.38E-04 0.00E+00 S4 -3.20E-04 2.49E-04 -2.00E-05 -6.82E-05 1.05E-04 1.02E-04 0.00E+00 S5 -7.17E-04 -2.85E-04 6.75E-05 1.34E-04 4.27E-05 1.15E-06 0.00E+00 S6 -1.20E-04 8.50E-04 2.95E-04 -2.44E-04 -1.66E-04 -3.70E-05 -1.12E-05 S7 3.58E-04 3.66E-04 -3.69E-04 -3.79E-04 6.40E-05 5.55E-05 0.00E+00 S8 1.41E-03 1.53E-04 4.54E-04 -2.07E-04 -1.96E-04 -1.72E-04 -4.51E-05 S9 1.61E-03 7.64E-04 8.48E-04 -1.05E-03 -1.07E-04 3.32E-05 1.68E-04 S10 -8.99E-04 5.21E-03 -1.05E-03 -2.73E-03 -2.22E-04 8.35E-04 2.95E-04 S11 -7.76E-04 3.63E-03 1.64E-03 3.12E-06 -2.80E-04 3.41E-05 1.63E-05 S12 -7.36E-04 1.65E-03 -4.25E-04 1.08E-03 -5.96E-05 -2.49E-04 -3.87E-04 S13 -2.45E-03 -2.69E-04 1.46E-03 3.06E-03 -1.13E-04 -6.55E-04 -8.12E-04 S14 2.25E-03 -6.02E-03 1.83E-03 6.13E-04 1.22E-03 0.00E+00 0.00E+00

[0100] Table 2-2

[0101] Figure 2A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 1 is shown, which represents the deviation of light rays of different wavelengths from the convergent focal point after passing through the lens. Figure 2B The astigmatism curve of the optical imaging system of Embodiment 1 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 2C The distortion curve of the optical imaging system of Embodiment 1 is shown, which represents the distortion size values corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging system of Embodiment 1 is shown, which represents the deviation of light rays on the imaging surface after passing through the lens at different image heights. According to Figures 2A to 2D It can be seen that the optical imaging system given in Embodiment 1 can achieve good imaging quality.

[0102] Example 2

[0103] An optical imaging system according to Embodiment 2 of the present application is described below with reference to Figures 3 to 4D In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A structural schematic diagram of the optical imaging system according to Embodiment 2 of the present application is shown.

[0104] As shown in Figure 3 , the optical imaging system sequentially comprises, from the object side to the image side: a stop 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.

[0105] The first lens E1 has positive refractive power, and its object side surface S1 is a convex surface and its image side surface S2 is a concave surface.

[0106] The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface.

[0107] The third lens E3 has negative refractive power, and its object side surface S5 is a convex surface and its image side surface S6 is a concave surface.

[0108] The fourth lens E4 has positive refractive power, with a concave object side surface S7 and a convex image side surface S8.

[0109] The fifth lens E5 has positive refractive power, with a convex object side surface S9 and a concave image side surface S10.

[0110] The sixth lens E6 has positive refractive power, with a concave object side surface S11 and a convex image side surface S12.

[0111] The seventh lens E7 has negative refractive power, with a concave object side surface S13 and a concave image side surface S14.

[0112] The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through each surface S1-S16 in sequence and is ultimately imaged on an image plane S17.

[0113] In this example, the focal length f of the optical imaging system is 12.5 mm, the total track length TTL (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the image plane S17 of the optical imaging system) is 14.70 mm, the half of the diagonal length of the effective pixel area on the image plane S17 of the optical imaging system is ImgH = 8.27 mm, the half of the maximum field of view angle of the optical imaging system is Semi-FOV = 32.93°, and the F-number Fno of the optical imaging system is 2.09.

[0114] Table 3 shows a basic parameter table of the optical imaging system of Example 2, where the units of the curvature radius, effective focal length, and thickness are millimeters (mm). Tables 4-1 and 4-2 show the high-order term coefficients that can be used for each aspherical surface in Example 2, where each aspherical surface type can be defined by the formula (1) given above in Example 1.

[0115]

[0116] Table 3

[0117] Face Number A4 A6 A8 A10 A12 A14 A16 S1 1.32E-01 3.53E-02 1.19E-02 3.24E-03 8.74E-04 -2.16E-04 -4.46E-04 S2 3.48E-01 -1.48E-02 2.01E-02 -6.87E-03 -8.19E-04 -1.88E-03 1.30E-03 S3 -1.03E+00 -5.32E-02 -1.73E-02 -1.36E-02 -3.83E-03 1.02E-03 1.12E-03 S4 -1.96E-01 8.84E-02 -3.82E-03 -5.96E-03 -2.27E-03 3.07E-03 8.79E-04 S5 -9.44E-01 2.72E-02 -1.24E-02 1.17E-04 -3.39E-04 -2.00E-04 -3.35E-04 S6 -1.07E+00 1.20E-01 -7.90E-03 4.13E-03 -2.17E-03 -1.67E-03 -1.22E-03 S7 3.93E-01 -6.69E-02 2.83E-02 1.58E-03 -1.41E-04 -7.97E-04 -8.39E-04 S8 -4.80E-01 3.39E-02 2.85E-02 1.60E-02 5.38E-03 3.72E-03 5.45E-05 S9 -2.24E+00 3.66E-01 5.72E-03 -2.19E-02 4.51E-03 5.41E-03 -3.48E-03 S10 -2.27E+00 1.55E-01 4.09E-02 9.19E-03 2.18E-02 -1.94E-03 -6.35E-03 S11 5.52E-02 -1.17E-01 -1.39E-01 2.63E-02 4.67E-02 4.83E-03 -1.44E-03 S12 3.11E+00 -1.41E-01 3.35E-03 -6.93E-02 3.32E-02 -5.83E-03 5.14E-03 S13 -1.78E+00 4.97E-01 6.06E-02 -1.03E-01 -1.66E-02 4.03E-03 1.74E-02 S14 -7.75E+00 1.70E+00 -3.33E-01 1.30E-01 -7.75E-02 2.28E-02 -1.50E-02

[0118] Table 4-1

[0119] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -2.46E-04 5.34E-05 1.57E-04 1.09E-04 2.31E-05 -7.50E-07 0.00E+00 S2 3.46E-04 -4.53E-04 -4.94E-04 2.47E-05 1.78E-04 8.81E-05 0.00E+00 S3 -3.37E-05 -6.44E-04 -2.65E-04 1.08E-04 1.43E-04 5.21E-05 0.00E+00 S4 -4.04E-04 -4.68E-04 9.16E-05 2.18E-04 9.64E-05 7.11E-06 0.00E+00 S5 -2.40E-04 -2.85E-05 7.26E-05 4.21E-05 -1.60E-05 -1.79E-05 0.00E+00 S6 -2.19E-04 9.21E-04 4.41E-04 -9.89E-05 -2.54E-04 -1.31E-04 -3.72E-05 S7 -1.12E-04 3.88E-04 -4.15E-04 -5.92E-05 1.12E-04 6.54E-05 0.00E+00 S8 -6.64E-05 -2.41E-04 2.88E-04 1.37E-04 -1.87E-05 -7.52E-05 -3.08E-05 S9 8.95E-04 1.11E-03 -1.32E-04 -1.08E-03 -6.31E-05 3.05E-04 1.83E-04 S10 -1.41E-03 -1.04E-04 -1.23E-04 1.67E-04 1.54E-04 1.65E-06 -5.58E-05 S11 1.32E-04 1.04E-03 7.29E-04 -3.29E-05 -2.68E-04 -1.03E-04 -1.11E-06 S12 -3.50E-03 3.16E-04 -1.27E-04 1.00E-03 -6.20E-05 -5.88E-05 -1.26E-04 S13 -4.13E-03 -4.18E-05 -9.10E-04 1.98E-03 2.52E-04 2.08E-04 -2.42E-04 S14 4.26E-03 -3.03E-03 9.59E-04 -4.10E-04 3.94E-04 0.00E+00 0.00E+00

[0120] Table 4-2

[0121] Figure 4A An on-axis chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 4B An astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 4CThe distortion curve of the optical imaging system of Embodiment 2 is shown, which represents the distortion size values corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system of Embodiment 2 is shown, which represents the deviation of light rays via the lens on the imaging surface at different image heights. According to the formula Figures 4A to 4D It can be seen that the optical imaging system given in Embodiment 2 can achieve good imaging quality.

[0122] Example 3

[0123] The following refers to Figures 5 to 6D An optical imaging system according to Embodiment 3 of the present application is described. Figure 5 A structural schematic diagram of the optical imaging system according to Embodiment 3 of the present application is shown.

[0124] As shown in Figure 5 The optical imaging system sequentially comprises, from the object side to the image side: a stop 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.

[0125] The first lens E1 has positive refractive power, and its object side surface S1 is a convex surface and its image side surface S2 is a concave surface.

[0126] The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface.

[0127] The third lens E3 has negative refractive power, and its object side surface S5 is a convex surface and its image side surface S6 is a concave surface.

[0128] The fourth lens E4 has negative refractive power, and its object side surface S7 is a concave surface and its image side surface S8 is a convex surface.

[0129] The fifth lens E5 has negative refractive power, and its object side surface S9 is a convex surface and its image side surface S10 is a concave surface.

[0130] The sixth lens E6 has positive refractive power, and its object side surface S11 is a concave surface and its image side surface S12 is a convex surface.

[0131] The seventh lens E7 has negative refractive power, and its object side surface S13 is a convex surface and its image side surface S14 is a concave surface.

[0132] The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface S17.

[0133] In the present example, the focal length f of the optical imaging system is 12.5 mm, the total track length TTL (i.e., the distance 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 14.75 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 8.27 mm, the half of the maximum field of view angle Semi-FOV of the optical imaging system is 32.91°, and the F-number Fno of the optical imaging system is 2.09.

[0134] Table 5 shows the basic parameter table of the optical imaging system of Example 3, wherein the units of the radius of curvature, the effective focal length and the thickness are all millimeters (mm). Table 6-1 and Table 6-2 show the high-order term coefficients of the aspherical surfaces in Example 3, wherein each aspherical surface can be defined by the formula (1) given in Example 1.

[0135]

[0136]

[0137] Table 5

[0138] Face Number A4 A6 A8 A10 A12 A14 A16 S1 2.02E-01 4.39E-02 1.45E-02 4.33E-03 1.59E-03 3.05E-04 -4.16E-04 S2 3.76E-01 -3.18E-02 2.57E-02 -6.04E-03 -2.29E-03 -2.02E-03 1.39E-03 S3 -8.98E-01 1.15E-02 -2.27E-03 -5.65E-03 -2.96E-03 1.10E-03 1.23E-03 S4 -2.44E-01 8.94E-02 -1.49E-02 -4.81E-03 1.35E-03 2.18E-03 -8.13E-04 S5 -8.31E-01 2.63E-03 -7.10E-03 -2.84E-03 8.13E-04 4.78E-04 -3.26E-04 S6 -7.68E-01 5.38E-02 1.11E-02 -2.22E-03 8.57E-04 -3.21E-03 -6.16E-04 S7 4.30E-01 -8.71E-02 3.84E-02 -1.15E-03 7.33E-04 -3.58E-03 1.17E-03 S8 -1.02E+00 1.74E-01 -2.64E-02 3.95E-02 -2.04E-03 5.06E-03 -1.57E-03 S9 -2.90E+00 5.90E-01 -7.59E-02 1.40E-02 -1.10E-02 1.31E-02 -7.37E-03 S10 -2.46E+00 1.57E-01 6.46E-02 -1.08E-02 2.81E-02 2.34E-03 -1.23E-02 S11 2.45E-01 -4.08E-01 -2.78E-01 -7.03E-02 5.48E-03 -2.81E-02 -2.76E-02 S12 2.83E+00 -3.75E-02 -5.00E-02 -4.66E-02 3.24E-02 -9.94E-03 2.72E-03 S13 -3.46E+00 9.12E-01 -6.69E-02 -4.97E-02 -4.37E-02 1.28E-02 1.21E-02 S14 -7.51E+00 1.68E+00 -3.41E-01 1.43E-01 -8.72E-02 2.93E-02 -1.63E-02

[0139] Table 6-1

[0140] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -7.24E-04 -3.14E-04 1.37E-04 2.71E-04 1.27E-04 3.74E-05 0.00E+00 S2 1.68E-03 -1.11E-03 -1.33E-03 -6.08E-05 5.99E-04 2.17E-04 0.00E+00 S3 1.65E-03 -5.11E-04 -1.10E-03 -2.69E-04 3.70E-04 1.98E-04 0.00E+00 S4 -1.13E-04 2.55E-04 -1.34E-04 -1.12E-04 1.25E-04 1.22E-04 0.00E+00 S5 -6.70E-04 -1.52E-04 1.02E-04 1.02E-04 -5.79E-06 -1.50E-05 0.00E+00 S6 -3.94E-04 1.08E-03 1.50E-04 -3.18E-04 -1.42E-04 6.18E-06 8.40E-06 S7 -2.00E-05 7.41E-04 -7.61E-04 -3.39E-04 1.79E-04 7.43E-05 0.00E+00 S8 1.04E-03 3.69E-04 6.86E-04 -9.49E-05 -2.51E-04 -2.36E-04 -7.87E-05 S9 1.82E-03 7.83E-04 6.27E-04 -1.11E-03 -4.19E-05 5.94E-05 1.72E-04 S10 -1.87E-03 4.68E-03 -7.36E-04 -2.37E-03 -2.09E-04 7.13E-04 2.45E-04 S11 -1.85E-02 -9.41E-03 -7.65E-03 -6.33E-03 -4.24E-03 -2.40E-03 -1.11E-03 S12 -1.02E-03 1.74E-03 -3.72E-04 9.83E-04 -1.44E-04 -1.83E-04 -3.50E-04 S13 -2.62E-03 1.39E-04 1.52E-03 3.14E-03 -1.92E-04 -6.79E-04 -8.58E-04 S14 2.71E-03 -6.18E-03 1.81E-03 5.30E-04 1.24E-03 0.00E+00 0.00E+00

[0141] Table 6-2

[0142] Figure 6A The on-axis chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the optical imaging system of Example 3 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 6C The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion size 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 the light rays on the imaging surface after passing through the lens. According to the formula (2), the magnification chromatic aberration curve of the optical imaging system of Example 3 is shown. Figures 6A to 6D It can be seen that the optical imaging system given in Example 3 can achieve good imaging quality.

[0143] Example 4

[0144] The following refers to Figures 7 to 8D The optical imaging system according to Example 4 of the present application is described. Figure 7 The structure schematic diagram of the optical imaging system according to Example 4 of the present application is shown. The structure schematic diagram of the optical imaging system according to Example 4 of the present application is shown.

[0145] As shown in FIG. 1, the optical imaging system sequentially includes, from the object side to the image side, a stop 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. Figure 7

[0146] The first lens E1 has positive refractive power, and its object side surface S1 is a convex surface and its image side surface S2 is a concave surface.

[0147] The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface.

[0148] The third lens E3 has negative refractive power, and its object side surface S5 is a convex surface and its image side surface S6 is a concave surface.

[0149] The fourth lens E4 has negative refractive power, and its object side surface S7 is a convex surface and its image side surface S8 is a concave surface.

[0150] The fifth lens E5 has positive refractive power, and its object side surface S9 is a convex surface and its image side surface S10 is a concave surface.

[0151] The sixth lens E6 has positive refractive power, and its object side surface S11 is a concave surface and its image side surface S12 is a convex surface.

[0152] The seventh lens E7 has negative refractive power, and its object side surface S13 is a convex surface and its image side surface S14 is a concave surface.

[0153] The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface S17.

[0154] In this example, the focal length f of the optical imaging system is 10.02 mm, the total track length TTL (i.e., the distance 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 12.04 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 6.50 mm, the half of the maximum field of view angle of the optical imaging system is Semi-FOV = 32.39°, and the F-number Fno of the optical imaging system is 1.85.

[0155] Table 7 shows the basic parameter table of the optical imaging system of Example 4, wherein the units of the curvature radius, effective focal length, and thickness are millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients of the aspherical surfaces that can be used in the optical imaging system of Example 4, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0156] ​

[0157]

[0158] Table 7

[0159] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -5.76E-02 -2.38E-02 -3.02E-03 -8.28E-04 -1.57E-04 -1.32E-04 -3.33E-05 S2 7.66E-02 -3.15E-02 1.51E-03 -1.32E-03 -3.61E-04 -4.15E-05 8.17E-06 S3 -5.12E-01 -4.81E-03 -8.45E-03 -8.37E-04 -1.53E-03 -1.06E-04 2.39E-05 S4 -2.69E-01 2.60E-02 -5.42E-03 6.53E-04 -1.44E-03 -5.34E-04 -2.56E-04 S5 -2.65E-01 -1.46E-02 -1.18E-03 1.26E-03 -5.94E-04 -6.96E-04 -2.19E-04 S6 -3.69E-01 6.90E-03 -1.11E-02 3.17E-03 -3.08E-03 8.74E-04 2.88E-04 S7 -8.25E-02 1.98E-02 -1.47E-02 1.92E-03 -4.82E-03 1.29E-03 -5.18E-05 S8 -1.08E+00 1.86E-01 -6.01E-02 1.95E-02 -1.02E-02 3.74E-03 -1.80E-03 S9 -1.48E+00 1.43E-01 -4.96E-02 2.33E-02 -9.06E-03 3.65E-03 -1.95E-03 S10 -7.66E-01 -4.62E-02 3.88E-02 3.80E-03 -4.14E-03 -4.02E-03 -1.15E-03 S11 3.39E-01 6.38E-02 1.06E-02 -8.59E-03 -2.41E-03 -3.74E-03 -9.47E-04 S12 1.56E+00 -1.01E-02 -3.87E-03 -2.23E-02 1.20E-02 -2.98E-03 -6.14E-04 S13 -2.47E+00 4.20E-01 -3.12E-02 3.18E-02 -1.44E-02 -2.08E-03 -1.43E-03 S14 -4.17E+00 7.96E-01 -1.83E-01 8.85E-02 -3.20E-02 1.26E-02 -7.37E-03

[0160] Table 8-1

[0161] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -1.89E-05 -5.28E-06 4.53E-07 7.99E-06 3.55E-06 0.00E+00 0.00E+00 S2 1.39E-05 2.69E-06 6.69E-06 3.41E-06 2.53E-06 0.00E+00 0.00E+00 S3 4.78E-05 1.66E-05 2.18E-05 1.11E-05 1.15E-05 2.39E-06 3.52E-06 S4 -1.14E-04 -5.39E-05 -1.99E-05 -7.03E-06 0.00E+00 0.00E+00 0.00E+00 S5 -2.94E-05 -3.81E-05 -1.81E-05 -5.80E-06 -1.75E-06 -3.16E-06 0.00E+00 S6 5.59E-04 -2.72E-04 1.27E-04 2.81E-05 0.00E+00 0.00E+00 0.00E+00 S7 6.31E-04 -3.75E-04 1.83E-04 1.83E-05 -3.25E-06 -5.46E-06 3.02E-07 S8 9.28E-04 -3.62E-04 1.89E-04 -8.07E-05 4.06E-05 -8.30E-06 1.24E-07 S9 7.44E-04 -4.64E-04 1.58E-04 -9.16E-05 3.66E-05 -1.31E-05 1.07E-05 S10 -3.32E-04 -1.23E-05 1.13E-05 5.37E-05 2.26E-05 7.44E-06 0.00E+00 S11 -4.42E-04 -1.20E-04 -4.96E-05 1.81E-06 -1.76E-05 -2.08E-05 -5.69E-06 S12 -9.54E-04 5.64E-04 2.49E-05 2.33E-05 -6.57E-05 2.00E-05 7.36E-06 S13 6.06E-04 4.48E-04 -8.07E-05 -4.55E-05 -1.09E-04 2.53E-05 -1.23E-05 S14 2.65E-03 -1.67E-03 6.39E-04 -4.29E-04 1.48E-04 -7.98E-05 4.72E-05

[0162] Table 8-2

[0163] Figure 8A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 4 is shown, which represents the deviation of light rays of different wavelengths from the convergent focal point after passing through the lens. Figure 8B The astigmatism curve of the optical imaging system of Embodiment 4 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 8C The distortion curve of the optical imaging system of Embodiment 4 is shown, which represents the distortion size values corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging system of Embodiment 4 is shown, which represents the deviation of light rays on the imaging surface at different image heights after passing through the lens. According to the formula Figures 8A to 8D It can be seen that the optical imaging system given in Embodiment 4 can achieve good imaging quality.

[0164] Example 5

[0165] The following refers to Figures 9 to 10D An optical imaging system according to Embodiment 5 of the present application is described. Figure 9 A structural schematic diagram of the optical imaging system according to Embodiment 5 of the present application is shown.

[0166] As shown in Figure 9 the optical imaging system sequentially comprises, from the object side to the image side: a stop 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.

[0167] The first lens E1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0168] The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0169] The third lens E3 has negative refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.

[0170] The fourth lens E4 has negative refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.

[0171] The fifth lens E5 has positive refractive power, and its object side surface S9 is convex, and its image side surface S10 is concave.

[0172] The sixth lens E6 has positive refractive power, and its object side surface S11 is concave, and its image side surface S12 is convex.

[0173] The seventh lens E7 has negative refractive power, and its object side surface S13 is convex, and its image side surface S14 is concave.

[0174] The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0175] In the present example, the focal length f of the optical imaging system is 10.06 mm, the total track length TTL (i.e. the distance 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 12.04 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 5.94 mm, the half of the maximum field angle of the optical imaging system is Semi-FOV = 30.08°, and the F-number Fno of the optical imaging system is 1.85.

[0176] Table 9 shows a list of basic parameters of the optical imaging system of Example 5, where the units of the radius of curvature, effective focal length and thickness are all millimeters (mm). Table 10-1 and Table 10-2 show the high order term coefficients of the aspherical surfaces that can be used in the optical imaging system of Example 5, where each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0177]

[0178]

[0179] Table 9

[0180] Face Number A4 A6 A8 A10 A12 A14 A16 S1 1.33E-03 -2.87E-02 -7.01E-03 -1.95E-03 -2.94E-04 -1.28E-04 -9.92E-07 S2 1.53E-01 -4.60E-02 -3.15E-03 -5.58E-04 -9.34E-04 2.76E-04 -8.48E-05 S3 -5.58E-01 1.72E-03 -1.01E-02 1.42E-03 -2.11E-03 1.44E-04 -4.83E-05 S4 -3.06E-01 3.69E-02 -5.87E-03 2.27E-03 -1.10E-03 -1.53E-04 -4.23E-05 S5 -3.17E-01 -2.04E-02 3.58E-04 1.92E-03 3.67E-04 -2.51E-04 1.18E-04 S6 -3.48E-01 -1.07E-02 -3.38E-03 1.63E-03 -3.79E-04 -9.36E-06 5.99E-04 S7 -8.84E-03 -9.58E-04 -1.01E-02 -8.78E-04 -2.09E-03 -1.98E-05 2.44E-04 S8 -1.01E+00 1.69E-01 -5.49E-02 1.58E-02 -8.17E-03 2.72E-03 -1.25E-03 S9 -1.01E+00 1.69E-01 -5.49E-02 1.58E-02 -8.17E-03 2.72E-03 -1.25E-03 S10 -6.62E-01 -3.50E-02 3.17E-02 7.58E-03 1.04E-03 -1.11E-03 -9.37E-06 S11 2.96E-01 6.24E-02 7.99E-03 -6.78E-03 8.62E-04 -1.62E-03 -3.37E-05 S12 1.28E+00 4.46E-02 -5.66E-03 -2.09E-02 6.54E-03 -1.24E-03 -2.19E-04 S13 -2.44E+00 4.40E-01 -4.61E-02 3.28E-02 -1.78E-02 3.93E-04 -1.51E-03 S14 -4.04E+00 7.91E-01 -1.94E-01 8.35E-02 -3.36E-02 1.33E-02 -6.88E-03

[0181] Table 10-1

[0182] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -1.52E-05 -2.57E-06 4.31E-06 5.19E-06 8.30E-07 0.00E+00 0.00E+00 S2 7.21E-05 -2.38E-05 2.40E-05 -1.10E-05 7.08E-06 0.00E+00 0.00E+00 S3 7.60E-05 8.52E-08 3.35E-05 8.05E-07 1.03E-05 3.28E-06 4.87E-06 S4 -9.57E-06 -1.03E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 7.93E-05 -1.40E-05 -1.21E-05 -1.55E-05 -1.17E-05 -7.95E-06 0.00E+00 S6 3.25E-04 -2.75E-04 1.55E-04 -4.43E-05 0.00E+00 0.00E+00 0.00E+00 S7 3.75E-04 -3.47E-04 2.18E-04 -6.20E-05 9.90E-06 -2.40E-06 2.04E-06 S8 6.39E-04 -2.44E-04 1.13E-04 -5.12E-05 1.95E-05 -3.55E-06 0.00E+00 S9 6.39E-04 -2.44E-04 1.13E-04 -5.12E-05 1.95E-05 -3.55E-06 0.00E+00 S10 -8.00E-05 -7.50E-05 -9.95E-05 -2.03E-05 -7.77E-06 8.46E-06 0.00E+00 S11 -3.72E-04 -1.42E-04 -1.14E-04 4.99E-06 -1.55E-05 -7.01E-06 -7.24E-06 S12 -7.74E-04 3.42E-04 1.22E-04 8.52E-05 -6.17E-05 1.14E-06 0.00E+00 S13 1.03E-03 2.41E-04 3.02E-05 -2.81E-05 -5.04E-05 3.72E-05 0.00E+00 S14 2.93E-03 -1.46E-03 7.28E-04 -3.20E-04 1.78E-04 -4.85E-05 3.95E-05

[0183] Table 10-2 Figure 10A An on-axis chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 10B An astigmatism curve of the optical imaging system of Example 5 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 10C A distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion size values corresponding to different image heights. Figure 10DThe 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 that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0184] Example 6

[0185] The following reference Figures 11 to 12D An optical imaging system according to Example 6 of the present application is described. Figure 11 A structural schematic diagram of an optical imaging system according to Example 6 of the present application is shown.

[0186] like Figure 11 As shown, the optical imaging system includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0187] The first lens E1 has positive refractive power, an object-side surface S1 of the first lens E1 is convex, and an image-side surface S2 of the first lens E1 is concave.

[0188] The second lens E2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave.

[0189] The third lens E3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave.

[0190] The fourth lens element E4 has negative refractive power, and its object-side surface S7 is convex, and its image-side surface S8 is concave.

[0191] The fifth lens E5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface S10 is concave.

[0192] The sixth lens E6 has positive refractive power, its object-side surface S11 is concave, and its image-side surface S12 is convex.

[0193] The seventh lens E7 has negative refractive power, its object-side surface S13 is convex, and its image-side surface S14 is concave.

[0194] The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0195] In the present example, the focal length f of the optical imaging system is 10.19 mm, the total track length TTL (i.e., the distance 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 12.04 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 5.94 mm, the half of the maximum field of view angle Semi-FOV of the optical imaging system is 29.75°, and the F-number Fno of the optical imaging system is 1.85.

[0196] Table 11 shows the basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, the effective focal length and the thickness are all millimeters (mm). Table 12-1 and Table 12-2 show the high-order term coefficients of the aspherical surfaces in Example 6, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0197]

[0198]

[0199] Table 11

[0200] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -2.89E-02 -3.61E-02 -8.93E-03 -3.11E-03 -8.68E-04 -2.47E-04 -3.20E-05 S2 1.11E-01 -6.18E-02 -4.54E-03 -3.30E-03 -6.66E-04 4.82E-04 -1.28E-04 S3 -6.22E-01 4.05E-03 -1.06E-02 -1.01E-03 -1.98E-03 5.24E-04 -1.21E-04 S4 -3.63E-01 5.01E-02 -3.15E-03 2.38E-03 -1.13E-03 6.07E-05 -1.43E-04 S5 -3.38E-01 -3.68E-03 3.47E-03 2.94E-03 -4.82E-06 -2.47E-04 -1.13E-04 S6 -3.86E-01 -1.33E-04 -4.74E-03 2.09E-03 -3.47E-04 9.23E-05 2.47E-05 S7 -3.41E-02 -1.10E-03 -8.35E-03 5.51E-04 -5.79E-04 5.41E-04 -4.97E-09 S8 -1.03E+00 1.75E-01 -5.51E-02 1.76E-02 -7.88E-03 3.28E-03 -1.33E-03 S9 -1.49E+00 1.67E-01 -3.61E-02 2.59E-02 -6.93E-03 3.37E-03 -1.66E-03 S10 -7.46E-01 -2.22E-02 5.40E-02 1.29E-02 -1.88E-04 -2.36E-03 -1.81E-05 S11 4.98E-01 1.04E-01 8.23E-03 -6.91E-03 1.21E-03 -2.40E-03 3.51E-04 S12 1.37E+00 7.44E-02 -1.87E-02 -2.18E-02 7.88E-03 -9.71E-04 -5.16E-04 S13 -2.41E+00 4.72E-01 -3.67E-02 2.90E-02 -1.78E-02 -2.43E-04 -9.66E-04 S14 -3.92E+00 7.80E-01 -1.92E-01 7.61E-02 -3.07E-02 1.23E-02 -5.74E-03

[0201] Table 12-1

[0202]

[0203]

[0204] Table 12-2

[0205] Figure 12A The on-axis chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of light rays of different wavelengths from the converging focal point after passing through the lens. Figure 12B The astigmatism curve of the optical imaging system of Example 6 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 12C The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion size values corresponding to different image heights. Figure 12D The lateral chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of light rays on the imaging surface after passing through the lens at different image heights. According to the formula (2) given above, the lateral chromatic aberration curve of the optical imaging system of Example 6 is shown in FIG. 12B. Figures 12A to 12D It can be seen that the optical imaging system given in Example 6 can achieve good imaging quality.

[0206] Example 7

[0207] The following refers to Figures 13 to 14D An optical imaging system according to Example 7 of the present application is described. Figure 13A structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown.

[0208] As shown in Figure 13 the optical imaging system comprises, in order from the object side to the image side: a stop 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.

[0209] The first lens E1 has positive refractive power, and its object side surface S1 is a convex surface and its image side surface S2 is a concave surface.

[0210] The second lens E2 has negative refractive power, and its object side surface S3 is a convex surface and its image side surface S4 is a concave surface.

[0211] The third lens E3 has negative refractive power, and its object side surface S5 is a convex surface and its image side surface S6 is a concave surface.

[0212] The fourth lens E4 has negative refractive power, and its object side surface S7 is a convex surface and its image side surface S8 is a concave surface.

[0213] The fifth lens E5 has positive refractive power, and its object side surface S9 is a convex surface and its image side surface S10 is a concave surface.

[0214] The sixth lens E6 has positive refractive power, and its object side surface S11 is a concave surface and its image side surface S12 is a convex surface.

[0215] The seventh lens E7 has negative refractive power, and its object side surface S13 is a convex surface and its image side surface S14 is a concave surface.

[0216] The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through each surface S1 to S16 in order and is finally imaged on the imaging surface S17.

[0217] In this example, the focal length f of the optical imaging system is 9.81 mm, the total track length TTL (i.e., the distance 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 11.08 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 6.38 mm, the half of the maximum field of view angle of the optical imaging system is Semi-FOV = 32.46°, and the F-number Fno of the optical imaging system is 1.85.

[0218] Table 13 shows a basic parameter table of the optical imaging system of Embodiment 7, wherein the units of the curvature radius, the effective focal length, and the thickness are millimeters (mm). Tables 14-1 and 14-2 show the high-order term coefficients of the aspherical surfaces that can be used in the optical imaging system of Embodiment 7, wherein each aspherical surface can be defined by the formula (1) given in Embodiment 1 above.

[0219]

[0220]

[0221] Table 13

[0222] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -6.44E-02 -2.54E-02 -3.32E-03 -9.19E-04 -1.86E-04 -1.38E-04 -2.46E-05 S2 6.65E-02 -3.12E-02 2.99E-04 -9.79E-04 -5.76E-04 9.32E-05 -3.34E-05 S3 -5.10E-01 -5.06E-03 -9.42E-03 -4.11E-04 -1.64E-03 1.84E-05 -4.77E-06 S4 -2.62E-01 2.43E-02 -6.04E-03 6.69E-04 -1.40E-03 -4.78E-04 -2.53E-04 S5 -2.48E-01 -1.52E-02 -1.65E-03 1.36E-03 -4.63E-04 -5.37E-04 -1.82E-04 S6 -3.58E-01 7.57E-03 -1.22E-02 3.93E-03 -3.05E-03 1.32E-03 1.98E-04 S7 -8.80E-02 2.37E-02 -1.65E-02 2.49E-03 -5.11E-03 1.67E-03 -1.61E-04 S8 -1.03E+00 1.79E-01 -5.75E-02 1.83E-02 -9.80E-03 3.49E-03 -1.64E-03 S9 -1.41E+00 1.35E-01 -4.82E-02 2.23E-02 -8.58E-03 3.42E-03 -1.72E-03 S10 -7.38E-01 -4.24E-02 3.61E-02 2.30E-03 -5.00E-03 -3.91E-03 -8.50E-04 S11 3.36E-01 6.50E-02 9.79E-03 -1.02E-02 -3.55E-03 -3.65E-03 -7.19E-04 S12 1.49E+00 -8.23E-03 -1.65E-03 -2.11E-02 1.06E-02 -2.88E-03 -6.32E-04 S13 -2.36E+00 3.80E-01 -2.67E-02 3.22E-02 -1.17E-02 -2.58E-03 -1.84E-03 S14 -4.04E+00 7.64E-01 -1.78E-01 8.48E-02 -3.02E-02 1.19E-02 -6.98E-03

[0223] Table 14-1

[0224]

[0225]

[0226] Table 14-2

[0227] Figure 14A The on-axis chromatic aberration curve of the optical imaging system of Embodiment 7 is shown, which represents the deviation of light rays of different wavelengths via the convergent focal point after the lens. Figure 14B The astigmatism curve of the optical imaging system of Embodiment 7 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 14C The distortion curve of the optical imaging system of Embodiment 7 is shown, which represents the distortion size value corresponding to different image heights. Figure 14D The magnification chromatic aberration curve of the optical imaging system of Embodiment 7 is shown, which represents the deviation of light rays via the lens on the imaging surface at different image heights. According to Figures 14A to 14D It can be seen that the optical imaging system given by Embodiment 7 can achieve good imaging quality.

[0228] Example 8

[0229] The following refers to Figures 15 to 16D An optical imaging system according to Embodiment 8 of the present application is described. Figure 15 A structural schematic diagram of the optical imaging system according to Embodiment 8 of the present application is shown.

[0230] As Figure 15 shown, the optical imaging system sequentially comprises, from the object side to the image side: a stop 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.

[0231] The first lens E1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0232] The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0233] The third lens E3 has negative refractive power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.

[0234] The fourth lens E4 has negative refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.

[0235] The fifth lens E5 has positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface.

[0236] The sixth lens E6 has positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface.

[0237] The seventh lens E7 has negative refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface.

[0238] The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0239] In the present example, the focal length f of the optical imaging system is 9.81 mm, the total track length TTL (i.e., the distance 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 11.08 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system is ImgH = 6.38 mm, the half of the maximum field of view angle of the optical imaging system is Semi-FOV = 32.46°, and the F-number Fno of the optical imaging system is 1.85.

[0240] Table 15 shows a basic parameter table of the optical imaging system of Example 8, where the units of the curvature radius, effective focal length, and thickness are millimeters (mm). Table 16-1 and Table 16-2 show the high-order term coefficients of the aspherical surfaces that can be used in the optical imaging system of Example 8, where each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0241]

[0242]

[0243] Table 15

[0244] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -3.51E-02 -1.72E-02 -2.69E-03 -9.82E-04 -3.08E-04 -1.74E-04 -5.32E-05 S2 7.46E-02 -2.27E-02 -8.08E-04 -8.39E-04 -9.14E-04 1.94E-04 -1.51E-04 S3 -4.14E-01 -5.04E-04 -7.40E-03 -1.19E-04 -1.62E-03 1.02E-04 -8.64E-05 S4 -8.38E-01 -1.53E-01 -8.71E-02 -4.85E-02 -3.33E-02 -2.26E-02 -1.60E-02 S5 -3.06E-01 -1.11E-02 -1.67E-03 4.16E-04 -7.82E-04 -6.02E-04 -1.49E-04 S6 -3.93E-01 1.38E-02 -9.93E-03 2.43E-03 -2.72E-03 8.43E-04 3.32E-04 S7 -4.60E-02 1.51E-02 -1.43E-02 1.41E-03 -4.34E-03 1.00E-03 -5.51E-05 S8 -9.76E-01 1.71E-01 -5.84E-02 1.86E-02 -1.00E-02 3.61E-03 -1.75E-03 S9 -1.39E+00 1.37E-01 -5.30E-02 2.21E-02 -9.55E-03 3.68E-03 -1.82E-03 S10 -7.26E-01 -3.76E-02 3.30E-02 1.62E-03 -5.24E-03 -4.11E-03 -8.99E-04 S11 3.44E-01 7.26E-02 1.16E-02 -8.68E-03 -3.66E-03 -3.80E-03 -8.78E-04 S12 1.51E+00 -4.11E-02 1.33E-02 -2.46E-02 1.21E-02 -3.79E-03 -1.24E-05 S13 1.51E+00 -4.11E-02 1.33E-02 -2.46E-02 1.21E-02 -3.79E-03 -1.24E-05 S14 -3.69E+00 6.64E-01 -1.46E-01 7.00E-02 -2.29E-02 8.60E-03 -4.97E-03

[0245] Table 16-1

[0246]

[0247]

[0248] Table 16-2

[0249] Figure 16AAn on-axis chromatic aberration curve of the optical imaging system of Embodiment 8 is shown, which represents the deviation of light rays of different wavelengths from a convergent focal point after passing through the lens. Figure 16B A distortion curve of the optical imaging system of Embodiment 8 is shown, which represents the distortion size values corresponding to different image heights. Figure 16C A distortion curve of the optical imaging system of Embodiment 8 is shown, which represents the distortion size values corresponding to different image heights. Figure 16D A distortion curve of the optical imaging system of Embodiment 8 is shown, which represents the distortion size values corresponding to different image heights. Figures 16A to 16D It can be known that the optical imaging system provided by Embodiment 8 can achieve good imaging quality.

[0250] Example 9

[0251] The following refers to Figures 17 to 18D An optical imaging system according to Embodiment 9 of the present application is described. Figure 17 A structural schematic diagram of the optical imaging system according to Embodiment 9 of the present application is shown.

[0252] As Figure 17 shown, the optical imaging system sequentially comprises, from the object side to the image side: a stop 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.

[0253] The first lens E1 has positive refractive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0254] The second lens E2 has negative refractive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0255] The third lens E3 has negative refractive power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.

[0256] The fourth lens E4 has negative refractive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.

[0257] The fifth lens E5 has positive refractive power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface.

[0258] The sixth lens E6 has positive refractive power, and the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface.

[0259] The seventh lens E7 has negative refractive power, and the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface.

[0260] The filter E8 has an object side S15 and an image side S16. Light from an object passes through each surface S1 to S16 in turn and is ultimately imaged on an imaging surface S17.

[0261] In the present example, the focal length f of the optical imaging system is 9.81 mm, the total track length TTL of the optical imaging system (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging system) is 11.08 mm, the half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging system ImgH is 6.38 mm, the half of the maximum field angle of the optical imaging system Semi-FOV is 32.46°, and the F-number Fno of the optical imaging system is 1.85.

[0262] Table 17 shows a list of basic parameters of the optical imaging system of Example 9, where the units of the radius of curvature, the effective focal length and the thickness are all in millimeters (mm). Tables 18-1 and 18-2 show the high-order term coefficients of each aspherical surface in Example 9, where each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0263]

[0264] Table 17

[0265] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -5.55E-02 -2.33E-02 -2.92E-03 -8.41E-04 -1.40E-04 -1.04E-04 -2.82E-05 S2 6.82E-02 -2.88E-02 7.78E-04 -9.41E-04 -4.35E-04 7.36E-05 -5.72E-05 S3 -5.03E-01 -2.79E-03 -9.03E-03 -3.83E-04 -1.48E-03 1.35E-05 -3.64E-05 S4 -2.62E-01 2.59E-02 -5.76E-03 7.68E-04 -1.30E-03 -4.44E-04 -2.46E-04 S5 -2.55E-01 -1.41E-02 -1.59E-03 1.35E-03 -5.01E-04 -6.17E-04 -1.98E-04 S6 -3.49E-01 3.43E-03 -1.01E-02 2.93E-03 -2.61E-03 7.44E-04 3.03E-04 S7 -7.29E-02 1.54E-02 -1.28E-02 1.28E-03 -4.18E-03 1.08E-03 -1.36E-05 S8 -1.04E+00 1.80E-01 -5.79E-02 1.88E-02 -9.69E-03 3.59E-03 -1.75E-03 S9 -1.43E+00 1.39E-01 -4.87E-02 2.29E-02 -8.64E-03 3.35E-03 -2.05E-03 S10 -7.45E-01 -4.42E-02 3.79E-02 3.30E-03 -3.99E-03 -3.79E-03 -9.86E-04 S11 3.42E-01 6.32E-02 9.47E-03 -9.92E-03 -2.91E-03 -3.39E-03 -7.05E-04 S12 1.54E+00 -1.23E-02 -5.26E-03 -2.17E-02 1.17E-02 -3.02E-03 -7.96E-04 S13 -2.42E+00 4.15E-01 -3.00E-02 3.07E-02 -1.44E-02 -2.19E-03 -1.45E-03 S14 -4.09E+00 7.83E-01 -1.79E-01 8.65E-02 -3.14E-02 1.22E-02 -7.24E-03

[0266] Table 18-1

[0267]

[0268]

[0269] Table 18-2

[0270] Figure 18A The on-axis chromatic aberration curve of the optical imaging system of Example 9 is shown, which represents the deviation of light rays of different wavelengths from the converging focal point after passing through the lens. Figure 18B The astigmatism curve of the optical imaging system of Example 9 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 18C The distortion curve of the optical imaging system of Example 9 is shown, which represents the distortion size values corresponding to different image heights. Figure 18D The lateral chromatic aberration curve of the optical imaging system of Example 9 is shown, which represents the deviation of light rays on the imaging surface after passing through the lens at different image heights. According to the formula (2) given above, the lateral chromatic aberration curve can be calculated as follows: Figures 18A to 18D It can be seen that the optical imaging system given in Example 9 can achieve good imaging quality.

[0271] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 19.

[0272]

[0273] Table 19

[0274] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0275] The above description is merely preferred embodiments of the present application and the technical principles used. Those skilled in the art should understand that the scope of the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging system, characterized in that The optical lens system includes, from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having refractive power, a fifth lens having positive refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, wherein: The object-side surfaces of the first lens, the second lens, and the third lens are all convex, and the image-side surfaces are all concave; The object-side surface of the fifth lens is convex, and the image-side surface is concave; The object-side surface of the sixth lens is concave, and the image-side surface is convex; The image side surface of the seventh lens is concave; the number of lenses having optical power in the optical imaging system is seven; and Half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system ImgH, the aperture number Fno of the optical imaging system, the distance BFL from the image side surface of the seventh lens to the imaging plane on the optical axis, the combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R9 of the object side surface of the fifth lens, the curvature radius R12 of the image side surface of the sixth lens, the distance TTL from the object side surface of the first lens to the imaging plane on the optical axis, the effective focal length f of the optical imaging system, the effective focal length f7 of the seventh lens, the effective focal length f5 of the fifth lens, and the maximum half field of view Semi-FOV of the optical imaging system satisfy the following conditions: 5.49mm≤ImgH×Fno / 2≤8.65mm; -0.24≤(BFL-f56) / (R9-R12)<0; and 3.7mm <TTL / Fno×tan(Semi-FOV)<4.6mm; 1.27≤(f-f7) / f5<3.

3.

2. The optical imaging system according to claim 1, wherein: The distance TTL from the object side of the first lens to the imaging surface on the optical axis, the distance TD from the object side of the first lens to the image side of the seventh lens on the optical axis, and the maximum half field of view Semi-FOV of the optical imaging system satisfy: 30.42mm≤(TTL+TD) / tan(Semi-FOV)≤37.12mm.

3. The optical imaging system according to claim 1, wherein: The effective focal length f of the optical imaging system and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy: 1.57≤f / f3456<2.

3.

4. The optical imaging system according to claim 1, wherein: The curvature radius R3 of the object side surface of the second lens, the curvature radius R11 of the object side surface of the sixth lens, and the 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 on the optical axis satisfy: -5.2<(R3-R11) / SAG61≤-4.

06.

5. The optical imaging system according to claim 1, wherein: The combined focal length f56 of the fifth lens and the sixth lens, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the following conditions: 2.7 <f56 / (CT5+CT6)<4.5。 6. The optical imaging system according to claim 1, wherein: A curvature radius R11 of the object-side surface of the sixth lens, a curvature radius R9 of the object-side surface of the fifth lens, and an air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -9.0<(R11-R9) / T56<-3.

3.

7. The optical imaging system according to claim 1, wherein: An air gap T56 between the fifth lens and the sixth lens on the optical axis, an air gap T45 between the fourth lens and the fifth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy the following: 1.2<(T56+T45) / CT5<2.

2.

8. The optical imaging system according to claim 1, wherein: A center thickness CT7 of the seventh lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy the following: 0.89≤(CT7+CT6) / (CT5+CT3)<1.

4.

9. The optical imaging system according to any one of claims 1 to 8, wherein: A distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, a distance BFL on the optical axis from the image side surface of the seventh lens to the imaging plane, and a sum ∑AT of an air gap on the optical axis between any two adjacent lenses from the first lens to the seventh lens satisfy the following: 1.09≤|TD / (BFL-∑AT)| / 3≤2.

56.

10. The optical imaging system according to any one of claims 1 to 8, wherein: The maximum effective radius DT71 of the object side surface of the seventh lens, the maximum effective radius DT61 of the object side surface of the sixth lens, the maximum effective radius DT41 of the object side surface of the fourth lens, and the maximum effective radius DT11 of the object side surface of the first lens satisfy: -6.23≤(DT71-DT61) / (DT41-DT11)≤-1.

55.

11. The optical imaging system according to any one of claims 1 to 8, wherein: The air gap T23 between the second lens and the third lens on the optical axis, the distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens on the optical axis, and the distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens on the optical axis satisfy: 2.0 <T23 / (SAG21+SAG31)≤5.15。 12. The optical imaging system according to any one of claims 1 to 8, wherein: The 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 on the optical axis, the distance SAG51 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 on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: -2.95≤(SAG61-SAG51) / CT6≤-1.

07.

13. The optical imaging system according to any one of claims 1 to 8, wherein: The sum ΣET of the edge thicknesses of all lenses from the first lens to the seventh lens at the maximum effective radius and the sum ΣAT of the air gaps on the optical axis between any two adjacent lenses from the first lens to the seventh lens satisfy the following: 1.2<ΣET / ΣAT≤1.

70.

14. The optical imaging system according to any one of claims 1 to 8, wherein: The edge thickness ET7 of the seventh lens at the maximum effective radius and the edge thickness ET5 of the fifth lens at the maximum effective radius satisfy: 1.8 <ET7 / ET5<3.2。 15. The optical imaging system according to any one of claims 1 to 8, wherein: The refractive index N6 of the sixth lens, the refractive index N7 of the seventh lens, the edge thickness ET6 of the sixth lens at the maximum effective radius, and the edge thickness ET7 of the seventh lens at the maximum effective radius satisfy the following conditions: 1.28 mm -1 ≤(N6+N7) / (ET6+ET7)≤1.70mm -1 .

16. The optical imaging system according to any one of claims 1 to 8, wherein: The refractive index N3 of the third lens, the refractive index N5 of the fifth lens, the 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 on the optical axis, and the distance SAG52 from 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 on the optical axis satisfy: 6.77 mm -1 ≤(N3+N5) / (SAG51-SAG52)<10.3mm -1 .

Images