Optical imaging system, imaging module and electronic device

Abstract

The present invention proposes an optical imaging system, an imaging module and an electronic device. The optical imaging system includes, from the object side to the image side, a first lens with negative refractive power; a second lens and a third lens with refractive power; a fourth lens with positive refractive power, whose object side surface is convex at the optical axis and whose image side surface is convex at the optical axis; a fifth lens with negative refractive power; a sixth lens with positive refractive power, whose image side surface is convex at the optical axis; a seventh lens with negative refractive power, whose object side surface is convex at the optical axis and whose image side surface is concave at the optical axis; the optical imaging system satisfies the following conditional formula: Almax≤30°; wherein, each of the optical effective areas of the object side surface and the image side surface of the first lens to the seventh lens of the optical imaging system has a cut surface, and the cut surface intersects with a plane perpendicular to the optical axis to form an acute angle, and Almax is the maximum value of the acute angle.

Description

Technical Field

[0001] The present invention relates to optical imaging technology, and in particular to an optical imaging system, an imaging module and an electronic device. Background Art

[0002] With the widespread use of electronic products such as mobile phones, tablets, drones, and computers in our lives, various electronic products with shooting functions are constantly being introduced. Among them, the improvement and innovation of the shooting effect of camera lenses in electronic products has become one of the focuses of people's attention, and it has also become an important part of technological improvement. Whether it is possible to use micro camera elements to shoot high-quality, high-resolution, high-definition, and even clear pictures under dark conditions has become a key consideration for modern people to choose electronic products. Therefore, the miniaturization of optical system design and performance improvement have become the key factors for improving the shooting quality of current cameras.

[0003] In the process of realizing the present application, the inventors found that there are at least the following problems in the prior art: it is difficult for the existing optical imaging system to achieve a larger field of view and better image quality while maintaining miniaturization. Summary of the invention

[0004] In view of the above, it is necessary to propose an optical imaging system, an imaging module and an electronic device to solve the above problems.

[0005] An embodiment of the present application provides an optical imaging system, which includes, from the object side to the image side, in sequence: a first lens having negative refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the object side surface of the fourth lens being convex at the optical axis, and the image side surface of the fourth lens being convex at the optical axis; a fifth lens having negative refractive power; a sixth lens having positive refractive power, and the image side surface of the sixth lens being convex at the optical axis; a seventh lens having negative refractive power, the object side surface of the seventh lens being convex at the optical axis, and the image side surface of the seventh lens being concave at the optical axis; the optical imaging system satisfies the following condition: Almax≤30°; wherein, each of the object side surfaces and the image side surfaces of the first to seventh lenses of the optical imaging system has a cut surface within an optically effective area, and the cut surface intersects with a plane perpendicular to the optical axis to form an acute angle, and Almax is the maximum value of the acute angle.

[0006] The above formula is satisfied, and the surface curvature degree is reasonably set, so that the surface complexity of all lenses in the optical imaging system is low, and the increase of field curvature and distortion in the T direction is suppressed to a certain extent; at the same time, it is helpful to reduce the difficulty of molding and improve the overall image quality. The optical imaging system of the embodiment of the present application increases the field angle while satisfying the micro design through the above-mentioned reasonable lens configuration. The field angle is greater than that of conventional lenses, the relative brightness is improved, and the viewing area is increased. The optical imaging system can achieve higher pixels and good image quality.

[0007] In some embodiments, the optical imaging system satisfies the following condition:

[0008] FOV ≥ 110° and FNO ≤ 2.4;

[0009] Among them, FOV is the maximum field of view angle of the optical imaging system, and FNO is the aperture number of the optical imaging system.

[0010] By satisfying the above formula, on the one hand, the optical imaging system 10 can achieve ultra-wide-angle imaging and increase the viewing area to obtain more image information, and on the other hand, it can also ensure good light flux, thereby improving the optical imaging quality.

[0011] In some embodiments, the optical imaging system satisfies the following condition:

[0012] SD1 / ImgH<0.57;

[0013] Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side of the first lens to the optical axis, and ImgH is half of the image height corresponding to the maximum field of view of the optical imaging system.

[0014] Satisfying the above formula can make the aperture of the object side of the first lens relatively small, thereby achieving the characteristics of a small head while satisfying an ultra-wide angle, effectively reducing the cavity area required for the optical imaging system to be used in electronic devices, reducing costs and processing difficulties, thereby improving the yield and making the electronic equipment more beautiful.

[0015] In some embodiments, the optical imaging system satisfies the following condition:

[0016] FOV / f>71° / mm;

[0017] Wherein, FOV is the maximum field of view of the optical imaging system, and f is the focal length of the optical imaging system.

[0018] If the above formula is met, the optical imaging system can provide a field of view of more than 110°, which can effectively increase the viewing area of ​​the picture. Furthermore, the field of view can reach 124°, and the effective focal length is reduced. While accommodating more imaging area, the optical imaging system has a certain macro capability; through reasonable refractive power configuration, the system can improve its ability to capture low-frequency details and meet the design requirements of high image quality.

[0019] In some embodiments, the optical imaging system satisfies the following condition:

[0020] SD1 / AT12<6.1;

[0021] Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side of the first lens to the optical axis, and AT12 is the distance between the image side of the first lens and the object side of the second lens on the optical axis.

[0022] SD1 represents the head size of the optical imaging system 10, which affects the structural arrangement, assembly yield, etc. If the above formula is satisfied, SD1 can be effectively compressed, the head size can be reduced, and the width of the optical imaging system perpendicular to the optical axis can be reduced. Combined with the reduction of AT12, the overall volume can be compressed to a greater extent, the compactness of the optical imaging system can be improved, and the risk of ghost images can be reduced. On the other hand, the difficulty of structural arrangement can be reduced, and the assembly yield can be improved.

[0023] In some embodiments, the optical imaging system satisfies the following condition:

[0024] 0.64<(|R62|+|R72|) / f<0.94;

[0025] Wherein, R62 is the curvature radius of the image side surface of the sixth lens at the optical axis, R72 is the curvature radius of the image side surface of the seventh lens at the near optical axis, and f is the focal length of the optical imaging system.

[0026] The combined structure of the sixth lens and the seventh lens can offset most of the distortion and coma produced by the front lens; through the reasonable setting of the curvature radius, it can avoid introducing large spherical aberration and vertical axis chromatic aberration, which is beneficial to the reasonable distribution of primary aberrations on each lens and reduces tolerance sensitivity.

[0027] In some embodiments, the optical imaging system satisfies the following condition:

[0028] 1.8<(|f6|+|f7|) / f<2.5;

[0029] Among them, f6 is the focal length of the second lens, f7 is the focal length of the third lens, and f is the focal length of the optical imaging system.

[0030] By satisfying the above formula and reasonably configuring the sizes of the sixth lens and the seventh lens and the focal length of the optical imaging system, it is possible to avoid the large spherical aberration caused by the rear lens group and improve the overall resolution of the optical imaging system. At the same time, it is beneficial to reduce the complexity of the surface shape of the fifth lens group and help improve the yield rate of the optical imaging system.

[0031] In some embodiments, the optical imaging system satisfies the following condition:

[0032] 1.3<(|CT3|+|CT4|+|CT5|) / BF<1.8;

[0033] Among them, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and BF is the minimum distance between the sixth lens and the image plane in the optical axis direction.

[0034] Satisfying the above formula can ensure that the optical imaging system 10 and the photosensitive element have sufficient matching space, which is conducive to improving the assembly yield. At the same time, the reasonable configuration of CT3, CT4, and CT5 can shorten the optical length, help to form symmetry, and reduce optical distortion.

[0035] In some embodiments, the optical imaging system satisfies the following condition:

[0036] 0.59<|R71| / |f7|<1.1;

[0037] Wherein, R71 is the curvature radius of the object side of the seventh lens at the optical axis, and f7 is the focal length of the seventh lens.

[0038] By setting the reasonable optical focal length and curvature radius of the seventh lens, the surface complexity of the seventh lens can be reduced, and the increase of field curvature and distortion in the T direction can be suppressed to a certain extent; it is beneficial to reduce the difficulty of molding and improve the overall image quality.

[0039] In some embodiments, the optical imaging system satisfies the following condition:

[0040] AT45 / ET45<1.3;

[0041] Wherein, AT45 is the distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, and ET45 is the thickness of the edge of the optical effective area of ​​the fifth lens in the direction of the optical axis.

[0042] When the above formula is satisfied, the fourth lens and the fifth lens form a certain matching shape, the fifth lens has negative refractive power, the fourth lens has refractive power, and the matching of the fourth lens and the fifth lens has a very good correction effect on chromatic aberration, and also has a good correction effect on spherical aberration, which can make the system have a good resolution improvement. In addition, the reduction in size provides convenience for improving the compactness of the system and compressing the optical length.

[0043] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all made of plastic.

[0044] Thus, plastic lenses can reduce the weight of optical imaging systems and lower production costs.

[0045] In some embodiments, the optical imaging system further includes an aperture stop disposed between the third lens and the fourth lens.

[0046] The design of the center aperture makes it possible to achieve a wide viewing angle. In addition, the center aperture makes the structure of the optical imaging system symmetrical, so that the optical distortion is better controlled.

[0047] An embodiment of the present invention provides an imaging module, comprising the optical imaging system described in any one of the embodiments; and a photosensitive element, wherein the photosensitive element is disposed on the image side of the optical imaging system.

[0048] The imaging module of the embodiment of the present invention includes an optical imaging system. Through the above-mentioned reasonable lens configuration, while meeting the miniature design, the field of view angle is increased, the field of view angle is larger than that of a conventional lens, the relative brightness is improved, and the viewing area is increased. The imaging module can achieve higher pixels and good image quality.

[0049] An embodiment of the present invention provides an electronic device, comprising: a housing and an imaging module according to the above embodiment, wherein the imaging module is mounted on the housing.

[0050] The electronic device of the embodiment of the present invention includes the above-mentioned imaging module. The optical imaging system in the imaging module can achieve higher pixels and good image quality while meeting the requirements of miniature design through the above-mentioned reasonable lens configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and / or additional aspects and advantages of the present invention may become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0052] Figure 1 Schematic diagram of the structure of the optical imaging system according to the first embodiment of the present invention.

[0053] Figure 2Schematic diagram of spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system in the first embodiment of the present invention.

[0054] Figure 3 Schematic diagram of the structure of an optical imaging system according to a second embodiment of the present invention.

[0055] Figure 4 Schematic diagram of spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system in the second embodiment of the present invention.

[0056] Figure 5 Schematic diagram of the structure of an optical imaging system according to the third embodiment of the present invention.

[0057] Figure 6 Schematic diagram of spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system in the third embodiment of the present invention.

[0058] Figure 7 4 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

[0059] Figure 8 Schematic diagram of spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system in the fourth embodiment of the present invention.

[0060] Fig. 9 4 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

[0061] Fig.10 Schematic diagram of spherical aberration (mm), astigmatism (mm) and distortion (%) of the optical imaging system in the fifth embodiment of the present invention.

[0062] Fig.11 It is a structural schematic diagram of an imaging module according to an embodiment of the present invention.

[0063] Fig.12 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0064] Main component symbols

[0065] Electronic device 1000

[0066] Image acquisition module 100

[0067] Optical imaging system 10

[0068] First lens L1

[0069] Second lens L2

[0070] The third lens L3

[0071] The fourth lens L4

[0072] Fifth lens L5

[0073] Sixth lens L6

[0074] Seventh lens L7

[0075] IR filter L8

[0076] Aperture STO

[0077] Object side S1, S3, S5, S7, S9, S11, S13, S15

[0078] Like side S2, S4, S6, S8, S10, S12, S14, S16

[0079] Image plane S17

[0080] Photosensitive element 20

[0081] Housing 200 DETAILED DESCRIPTION

[0082] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0083] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0086] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0087] See also Figure 1 The optical imaging system 10 of the embodiment of the present invention includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with refractive power, a third lens L3 with refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. The optical imaging system 10 also has an image surface S17 on the image side. Preferably, the image surface S17 can be a receiving surface of a photosensitive element.

[0088] The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8, the object-side surface S7 is a convex surface at the optical axis, and the image-side surface S8 is a convex surface at the optical axis; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens L6 has an object-side surface S11 and an image-side surface S12, and the image-side surface S12 is a convex surface at the optical axis; the seventh lens L7 has an object-side surface S13 and an image-side surface S14, the object-side surface S13 is a convex surface at the optical axis, and the image-side surface S14 is a concave surface at the optical axis.

[0089] The optical imaging system 10 satisfies the following conditional formula:

[0090] Almax≤30°;

[0091] Among them, the optical imaging system 10 has cut surfaces at various locations within the optically effective areas of the object side and image side of the first lens L1 to the seventh lens L7, and the cut surfaces intersect with the plane perpendicular to the optical axis to form an acute angle, and Almax is the maximum value of the acute angle.

[0092] By satisfying the above formula and setting the reasonable degree of surface curvature, the surface complexity of all lenses in the optical imaging system is low, which suppresses the increase of field curvature and distortion in the T direction to a certain extent; at the same time, it is helpful to reduce the difficulty of molding and improve the overall image quality.

[0093] In the optical imaging system 10 of the embodiment of the present application, through the above-mentioned reasonable lens configuration, while meeting the miniature design, the field of view angle is increased, the field of view angle is larger than that of a conventional lens, the relative brightness is improved, and the viewing area is increased. The optical imaging system 10 can achieve higher pixels and good image quality.

[0094] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0095] FOV ≥ 110°;

[0096] FNO≤2.4.

[0097] Wherein, FOV is the maximum field of view of the optical imaging system 10, and FNO is the aperture number of the optical imaging system 10. FOV can be 110°, 112°, 116°, 120°, 124°, etc., and FNO can be 2.4, 2.35, 2.3, 2.25, 2.2, etc.

[0098] By satisfying the above formula, on the one hand, the optical imaging system 10 can achieve ultra-wide-angle imaging and increase the viewing area to obtain more image information, and on the other hand, it can also ensure good light flux, thereby improving the optical imaging quality.

[0099] In some embodiments, the optical imaging system satisfies the following condition:

[0100] SD1 / ImgH<0.57;

[0101] Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object-side surface S1 of the first lens L1 to the optical axis, ImgH is half of the image height corresponding to the maximum field angle of the optical imaging system 10, and SD1 / ImgH can be 0.562, 0.560, etc.

[0102] Satisfying the above formula can make the aperture of the object-side surface S1 of the first lens L1 relatively small, thereby achieving the characteristic of a small head while satisfying the ultra-wide angle, effectively reducing the cavity area required for the optical imaging system 10 to be used in electronic devices, reducing costs and processing difficulties, thereby improving the yield, and making the electronic devices more beautiful.

[0103] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0104] FOV / f>71° / mm;

[0105] Among them, FOV is the maximum field of view angle of the optical imaging system 10, f is the focal length of the optical imaging system, and FOV / f can be 71.35° / mm, 80.08° / mm, 85.48° / mm, 92.02° / mm, 99.28° / mm, etc.

[0106] If the above formula is satisfied, the optical imaging system 10 can provide a field of view exceeding 110°, which can effectively increase the viewing area of ​​the image. Furthermore, the field of view can reach 124°, and the effective focal length is reduced. The optical imaging system 10 has a certain macro capability while accommodating a larger imaging area; through a reasonable configuration of the refractive power, the system's ability to capture low-frequency details can be improved to meet the design requirements of high image quality.

[0107] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0108] SD1 / AT12<6.1;

[0109] Wherein, SD1 is a vertical distance from the edge of the optically effective area of ​​the object-side surface S1 of the first lens L1 to the optical axis, AT12 is a distance between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 on the optical axis, and SD1 / AT12 can be 2.962, 4.403, 6.022, 6.055, 3.663, etc.

[0110] SD1 represents the head size of the optical imaging system 10, which affects the structural arrangement, assembly yield, etc. If the above formula is satisfied, SD1 can be effectively compressed, the head size can be reduced, and the width of the optical imaging system 10 perpendicular to the optical axis can be reduced. Combined with the reduction of AT12, the overall volume can be compressed to a greater extent, the compactness of the optical imaging system 10 can be improved, and the risk of ghost images can be reduced. On the other hand, the difficulty of structural arrangement can be reduced, and the assembly yield can be improved.

[0111] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0112] 0.64<(|R62|+|R72|) / f<0.94;

[0113] Wherein, R62 is the curvature radius of the image-side surface S12 of the sixth lens L6 at the optical axis, R72 is the curvature radius of the image-side surface S14 of the seventh lens L7 at the near optical axis, f is the focal length of the optical imaging system 10, and (|R62|+|R72|) / f can be any value in the range of (0.64, 0.94), for example, it can be 0.873, 0.642, 0.661, 0.939, 0.785, etc.

[0114] Satisfying the above formula, the combined structure of the sixth lens L6 and the seventh lens L7 can offset most of the distortion and coma produced by the front lens. By setting a reasonable curvature radius, it can avoid introducing large spherical aberration and vertical chromatic aberration, which is beneficial to the reasonable distribution of primary aberrations on each lens and reduces tolerance sensitivity.

[0115] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0116] 1.8<(|f6|+|f7|) / f<2.5;

[0117] Among them, f6 is the focal length of the second lens, f7 is the focal length of the third lens, f is the focal length of the optical imaging system, and (|f6|+|f7|) / f can be any value in the range of (1.8, 2.5), for example, 2.435, 1.890, 1.930, 2.399, 2.251, etc.

[0118] By satisfying the above formula and reasonably configuring the sizes of the sixth lens L6 and the seventh lens L7 and the focal length of the optical imaging system 10, it is possible to avoid large spherical aberration caused by the rear lens group and improve the overall resolution of the optical imaging system 10. At the same time, it is beneficial to reduce the complexity of the surface shape of the fifth lens group and help improve the yield rate of the optical imaging system 10.

[0119] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0120] 1.3<(|CT3|+|CT4|+|CT5|) / BF<1.8;

[0121] Wherein, CT3 is the thickness of the third lens L3 on the optical axis, CT4 is the thickness of the fourth lens L4 on the optical axis, CT5 is the thickness of the fifth lens L5 on the optical axis, and BF is the minimum distance between the sixth lens L6 and the image plane S17 in the optical axis direction. (|CT3|+|CT4|+|CT5|) / BF can be any value in the range of (1.3, 1.8), for example, 1.377, 1.591, 1.533, 1.669, 1.719, etc.

[0122] Satisfying the above formula can ensure that the optical imaging system 10 and the photosensitive element have sufficient matching space, which is conducive to improving the assembly yield. At the same time, the reasonable configuration of CT3, CT4, and CT5 can shorten the optical length, help to form symmetry, and reduce optical distortion.

[0123] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0124] 0.59<|R71| / |f7|<1.1;

[0125] Wherein, R71 is the radius of curvature of the object-side surface S13 of the seventh lens L7 at the optical axis, and f7 is the focal length of the seventh lens L7. |R71| / |f7| can be any value in the range of (0.59, 1.1), such as 0.802, 0.643, 0.670, etc.

[0126] Satisfying the above formula, through the reasonable setting of the optical focal length and the curvature radius of the seventh lens L7, the surface complexity of the seventh lens L7 can be reduced, and the increase of the field curvature and distortion in the T direction can be suppressed to a certain extent; it is beneficial to reduce the difficulty of molding and improve the overall image quality.

[0127] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0128] AT45 / ET45<1.3;

[0129] Wherein, AT45 is the distance between the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 on the optical axis, and ET45 is the thickness of the edge of the optical effective area of ​​the fifth lens L5 in the direction of the optical axis. AT45 / ET45 can be 0.761, 0.953, 0.932, 0.838, 1.288, etc.

[0130] When the above formula is satisfied, the fourth lens L4 and the fifth lens L5 form a certain matching shape, the fifth lens L5 has negative refractive power, the fourth lens L4 has refractive power, and the matching of the fourth lens L4 and the fifth lens L5 has a very good correction effect on chromatic aberration, and also has a good correction effect on spherical aberration, which can make the system have a good resolution improvement. In addition, the reduction in size provides convenience for improving the compactness of the system and compressing the optical length.

[0131] In some embodiments, the optical imaging system 10 further includes an aperture STO. The aperture STO can be disposed before the first lens L1, after the seventh lens L7, between any two lenses, or on the surface of any lens. The aperture STO is used to reduce stray light and help improve image quality. For example, in some embodiments, the aperture STO is disposed between the third lens L3 and the fourth lens L4. The design of the central aperture makes it possible to achieve a wide viewing angle. In addition, the central aperture makes the structure of the optical imaging system 10 symmetrical, so that the optical distortion is better controlled.

[0132] In some embodiments, the optical imaging system 10 further includes an infrared filter L8, and the infrared filter L8 has an object-side surface S15 and an image-side surface S16. The infrared filter L8 is disposed on the image-side surface S14 of the seventh lens L7 to filter out light of other wavelengths such as visible light and only allow infrared light to pass, so that the optical imaging system 10 can also form images in dim environments and other special application scenarios.

[0133] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared filter L8 in sequence, and finally converges on the image plane S17.

[0134] In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all made of plastic. In this case, the lenses made of plastic can reduce the weight of the optical imaging system 10 and reduce the production cost. In other embodiments, each lens can also be made of glass, or any combination of plastic and glass.

[0135] In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspherical, which is beneficial to correct aberrations and improve imaging quality. For example, in the first embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in the optical imaging system 10 are all aspherical. Aspherical lenses can achieve more light refraction angles, so that the entire optical imaging system 10 can achieve high pixel requirements.

[0136] The shape of an aspheric surface is determined by the following formula:

[0137]

[0138] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex (at the optical axis), k is the cone constant, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0139] In this way, the optical imaging system 10 can effectively reduce the size of the optical imaging system 10 by adjusting the curvature radius and aspheric coefficient of each lens surface, and effectively correct the aberration to improve the imaging quality.

[0140] In some embodiments, the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is convex at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference. In this way, the surface shapes of the lenses at the circumference are reasonably configured to improve good image quality.

[0141] First embodiment

[0142] Please refer to Figure 1 and Figure 2 The optical imaging system 10 of the first embodiment includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 2 3 and 4 are spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system 10 in the first embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength of 587.5618 nm.

[0143] The object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 is concave at the optical axis; the object-side surface S3 of the second lens L2 is concave at the optical axis, and the image-side surface S4 is convex at the optical axis; the object-side surface S5 of the third lens L3 is convex at the optical axis, and the image-side surface S6 is concave at the optical axis; the object-side surface S7 of the fourth lens L4 is convex at the optical axis, and the image-side surface S8 is convex at the optical axis; the object-side surface S9 of the fifth lens L5 is convex at the optical axis, and the image-side surface S10 is concave at the optical axis; the object-side surface S11 of the sixth lens L6 is convex at the optical axis, and the image-side surface S12 is convex at the optical axis; the object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 is concave at the optical axis.

[0144] The object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 is concave at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 is concave at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference.

[0145] The aperture stop STO is provided between the third lens L3 and the fourth lens L4.

[0146] In the first embodiment, the optical imaging system 10 satisfies the following conditions: FOV=110°, FNO=2.40, f=1.54mm, Almax=30°, SD1 / ImgH=0.562, FOV / f=71.35° / mm, SD1 / AT12=2.962, (|R62|+|R72|) / f=0.873, (|f6|+|f7|) / f=2.435, (|CT3|+|CT4|+|CT5|) / BF=1.377, |R71| / |f7|=0.802, AT45 / ET45=0.761.

[0147] The reference wavelength in the first embodiment is 587nm, and the optical imaging system 10 in the first embodiment satisfies the conditions in the following table. The elements from the object plane to the image plane are arranged in the order of the elements from top to bottom in Table 1. Surface numbers 1 and 2 are the object side surface S1 and the image side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with a smaller surface number is the object side surface, and the surface with a larger surface number is the image side surface. The Y radius in Table 1 is the radius of curvature of the object side surface or the image side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the first lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens on the optical axis. Table 2 is a table of relevant parameters of the aspheric surface of each lens in Table 1, where K is the cone constant and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula.

[0148] Table 1

[0149]

[0150] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the field of view of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 on the optical axis.

[0151] Table 2

[0152]

[0153]

[0154] Second embodiment

[0155] Please refer to Figure 3 and Figure 4 The optical imaging system 10 of the second embodiment includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 4 3 and 4 are spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system 10 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength of 587.5618 nm.

[0156] The object-side surface S1 of the first lens L1 is concave at the optical axis, and the image-side surface S2 is concave at the optical axis; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 is concave at the optical axis; the object-side surface S5 of the third lens L3 is concave at the optical axis, and the image-side surface S6 is convex at the optical axis; the object-side surface S7 of the fourth lens L4 is convex at the optical axis, and the image-side surface S8 is convex at the optical axis; the object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 is concave at the optical axis; the object-side surface S11 of the sixth lens L6 is convex at the optical axis, and the image-side surface S12 is convex at the optical axis; the object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 is concave at the optical axis.

[0157] The object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference.

[0158] The aperture stop STO is provided between the third lens L3 and the fourth lens L4.

[0159] In the second embodiment, the optical imaging system 10 satisfies the following conditions: FOV=112°, FNO=2.35, f=1.40mm, Almax=30°, SD1 / ImgH=0.562, FOV / f=80.08° / mm, SD1 / AT12=4.403, (|R62|+|R72|) / f=0.642, (|f6|+|f7|) / f=1.890, (|CT3|+|CT4|+|CT5|) / BF=1.591, |R71| / |f7|=0.643, AT45 / ET45=0.953.

[0160] The reference wavelength in the second embodiment is 587 nm, and the optical imaging system 10 in the second embodiment meets the conditions in the following table: The definition of each parameter can be obtained from the first embodiment, and will not be repeated here.

[0161] Table 3

[0162]

[0163] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the field of view of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 on the optical axis.

[0164] Table 4

[0165]

[0166]

[0167] Third embodiment

[0168] Please refer to Figure 5 and Figure 6 The optical imaging system 10 of the third embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 6 3 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system 10 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength of 587.5618 nm.

[0169] The object-side surface S1 of the first lens L1 is concave at the optical axis, and the image-side surface S2 is concave at the optical axis; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 is concave at the optical axis; the object-side surface S5 of the third lens L3 is convex at the optical axis, and the image-side surface S6 is convex at the optical axis; the object-side surface S7 of the fourth lens L4 is convex at the optical axis, and the image-side surface S8 is convex at the optical axis; the object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 is concave at the optical axis; the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 is convex at the optical axis; the object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 is concave at the optical axis.

[0170] The object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference, and the image-side surface S8 is concave at the circumference; the object-side surface S9 of the fifth lens L5 is convex at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference.

[0171] The aperture stop STO is provided between the third lens L3 and the fourth lens L4.

[0172] In the third embodiment, the optical imaging system 10 satisfies the following conditions: FOV=116°, FNO=2.30, f=1.36mm, Almax=30°, SD1 / ImgH=0.562, FOV / f=85.48° / mm, SD1 / AT12=6.022, (|R62|+|R72|) / f=0.661, (|f6|+|f7|) / f=1.930, (|CT3|+|CT4|+|CT5|) / BF=1.533, |R71| / |f7|=0.670, AT45 / ET45=0.932.

[0173] The reference wavelength in the third embodiment is 587 nm, and the optical imaging system 10 in the third embodiment satisfies the conditions in the following table.

[0174] Table 5

[0175]

[0176]

[0177] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the field of view of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 on the optical axis.

[0178] Table 6

[0179]

[0180] Fourth embodiment

[0181] Please refer to Figure 7 and Figure 8The optical imaging system 10 of the fourth embodiment includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 8 3 and 4 are spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system 10 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength of 587.5618 nm.

[0182] The object-side surface S1 of the first lens L1 is concave at the optical axis, and the image-side surface S2 is convex at the optical axis; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 is concave at the optical axis; the object-side surface S5 of the third lens L3 is convex at the optical axis, and the image-side surface S6 is convex at the optical axis; the object-side surface S7 of the fourth lens L4 is convex at the optical axis, and the image-side surface S8 is convex at the optical axis; the object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 is concave at the optical axis; the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 is convex at the optical axis; the object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 is concave at the optical axis.

[0183] The object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference.

[0184] The aperture stop STO is provided between the third lens L3 and the fourth lens L4.

[0185] In the fourth embodiment, the optical imaging system 10 satisfies the following conditions: FOV=120°, FNO=2.25, f=1.30mm, Almax=30°, SD1 / ImgH=0.562, FOV / f=92.02° / mm, SD1 / AT12=6.055, (|R62|+|R72|) / f=0.939, (|f6|+|f7|) / f=2.399, (|CT3|+|CT4|+|CT5|) / BF=1.669, AT45 / ET45=0.838.

[0186] The reference wavelength in the fourth embodiment is 587 nm, and the optical imaging system 10 in the fourth embodiment satisfies the conditions in the following table.

[0187] Table 7

[0188]

[0189]

[0190] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the field of view of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 on the optical axis.

[0191] Table 8

[0192]

[0193] Fifth embodiment

[0194] Please refer to Fig. 9 and Fig.10 The optical imaging system 10 of the fifth embodiment includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Fig.10 3 and 4 are spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system 10 in the fifth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength of 587.5618 nm.

[0195] The object-side surface S1 of the first lens L1 is concave at the optical axis, and the image-side surface S2 is concave at the optical axis; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 is concave at the optical axis; the object-side surface S5 of the third lens L3 is convex at the optical axis, and the image-side surface S6 is convex at the optical axis; the object-side surface S7 of the fourth lens L4 is convex at the optical axis, and the image-side surface S8 is convex at the optical axis; the object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 is convex at the optical axis; the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 is convex at the optical axis; the object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 is concave at the optical axis.

[0196] The object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 is concave at the circumference; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 is convex at the circumference.

[0197] The aperture stop STO is provided between the third lens L3 and the fourth lens L4.

[0198] In the fifth embodiment, the optical imaging system 10 satisfies the following conditions: FOV=124°, FNO=2.20, f=1.25mm, Almax=30°, SD1 / ImgH=0.560, FOV / f=99.28° / mm, SD1 / AT12=3.663, (|R62|+|R72|) / f=0.785, (|f6|+|f7|) / f=2.251, (|CT3|+|CT4|+|CT5|) / BF=1.719, AT45 / ET45=1.288.

[0199] The reference wavelength in the fifth embodiment is 587 nm, and the optical imaging system 10 in the fifth embodiment satisfies the conditions in the following table.

[0200] Table 9

[0201]

[0202]

[0203] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the field of view of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 on the optical axis.

[0204] Table 10

[0205]

[0206] Please refer to Fig.11 An embodiment of the present invention provides an imaging module 100 , including an optical imaging system 10 and a photosensitive element 20 , wherein the photosensitive element 20 is disposed on the image side of the optical imaging system 10 .

[0207] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0208] The optical imaging system 10 in the imaging module 100 of the embodiment of the present invention increases the field of view angle while meeting the requirements of the miniature design through the above-mentioned reasonable lens configuration. The field of view angle is greater than that of a conventional lens, the relative brightness is improved, and the viewing area is increased. The optical imaging system 10 can achieve higher pixels and good image quality.

[0209] Please refer to Fig.12 The electronic device 1000 of the embodiment of the present invention includes a housing 200 and an imaging module 100 , and the imaging module 100 is mounted on the housing 200 .

[0210] The electronic device 1000 of the embodiment of the present invention includes but is not limited to a smart phone, a tablet computer, a laptop computer, an e-book reader, a portable multimedia player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, a wearable device, and other electronic devices that support imaging.

[0211] The optical imaging system 10 in the electronic device 1000 of the above embodiment increases the field of view angle while meeting the requirements of the miniature design through the above reasonable lens configuration. The field of view angle is greater than that of a conventional lens, the relative brightness is improved, and the viewing area is increased. The optical imaging system 10 can achieve higher pixels and good image quality.

[0212] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all variations that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0213] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An optical imaging system, characterized in that: The optical imaging system is composed of seven lenses with refractive power, which include, from the object side to the image side: The first lens has negative refractive power; The second lens has refractive power; The third lens has refractive power; a fourth lens having positive refractive power, wherein the object side surface of the fourth lens is convex at the optical axis, and the image side surface of the fourth lens is convex at the optical axis; A fifth lens element having negative refractive power; a sixth lens element having positive refractive power, wherein the image side surface of the sixth lens element is convex at the optical axis; a seventh lens having negative refractive power, wherein the object side surface of the seventh lens is convex at the optical axis, and the image side surface of the seventh lens is concave at the optical axis; The optical imaging system satisfies the following conditional formula: Almax≤30°; Among them, the optical imaging system has cut surfaces at various locations within the optically effective areas of the object side and image side of the first lens to the seventh lens, and the cut surfaces intersect with the plane perpendicular to the optical axis to form an acute angle, and Almax is the maximum value of the acute angle.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: FOV ≥ 110°; FNO≤2.4; Among them, FOV is the maximum field of view angle of the optical imaging system, and FNO is the aperture number of the optical imaging system.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: SD1 / ImgH<0.57; Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side of the first lens to the optical axis, and ImgH is half of the image height corresponding to the maximum field of view angle of the optical imaging system.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: FOV / f>71° / mm; Wherein, FOV is the maximum field of view of the optical imaging system, and f is the focal length of the optical imaging system.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: SD1 / AT12<6.1; Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side of the first lens to the optical axis, and AT12 is the distance between the image side of the first lens and the object side of the second lens on the optical axis.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0.64<(|R62|+|R72|) / f<0.94; Wherein, R62 is the curvature radius of the image side surface of the sixth lens at the optical axis, R72 is the curvature radius of the image side surface of the seventh lens at the optical axis, and f is the focal length of the optical imaging system.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.8<(|f6|+|f7|) / f<2.5; Among them, f6 is the focal length of the second lens, f7 is the focal length of the third lens, and f is the focal length of the optical imaging system.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.3<(|CT3|+|CT4|+|CT5|) / BF<1.8; Among them, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and BF is the minimum distance between the sixth lens and the image plane in the optical axis direction.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0.59<|R71| / |f7|<1.1; Wherein, R71 is the curvature radius of the object side of the seventh lens at the optical axis, and f7 is the focal length of the seventh lens.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: AT45 / ET45<1.3; Wherein, AT45 is the distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, and ET45 is the thickness of the edge of the optical effective area of ​​the fifth lens in the direction of the optical axis.

11. The optical imaging system according to claim 1, wherein: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all made of plastic.

12. The optical imaging system according to claim 1, wherein: The optical imaging system further includes an aperture stop, which is disposed between the third lens and the fourth lens.

13. An imaging module, characterized in that: include: The optical imaging system according to any one of claims 1 to 12; and A photosensitive element is arranged on the image side of the optical imaging system.

14. An electronic device, characterized in that: include: case; and The imaging module as described in claim 13 is mounted on the housing.

Images