Optical imaging system, image capturing module and electronic device

Abstract

The application provides an optical imaging system, an image-taking module and an electronic device. The optical imaging system comprises, in order from the object side to the image side, a first lens with positive refractive power, wherein the object side surface of the first lens is convex at the optical axis; a second lens with refractive power; a third lens with refractive power; a fourth lens with positive refractive power, wherein the image side surface of the fourth lens is convex at the optical axis; a fifth lens with refractive power; and a sixth lens with refractive power, wherein the object side surface of the sixth lens is convex at the optical axis, and the image side surface of the sixth lens is concave at the optical axis. The optical imaging system satisfies 0.5 < f1 / f26 < 1.6, wherein f26 is the combined focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and f1 is the effective focal length of the first lens. The optical imaging system has the advantages of wide viewing angle and small head size.

Description

Technical Field

[0006]

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

[0002] In recent years, full-screen mobile phones have gradually been favored by consumers. It can be seen that a high screen-to-body ratio has become a development trend of mobile phones. In this trend, the size of the mobile phone camera lens is required to be miniaturized, and at the same time, high imaging quality needs to be ensured. Therefore, the specifications of the camera lens are also getting higher and higher.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art: Although the camera lens conventionally mounted on portable electronic products can meet the miniaturization requirements, the head of the camera lens is relatively large, which is not conducive to the under-screen packaging of the camera lens, and the screen opening is relatively large, so the visual effect of a full screen cannot be achieved. Summary of the Invention

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

[0005] An embodiment of the present application provides an optical imaging system, which sequentially includes, from the object side to the image side: a first lens with positive refractive power, the object side of the first lens being convex at the optical axis; a second lens with refractive power; a third lens with refractive power; a fourth lens with positive refractive power, the image side of the fourth lens being convex at the optical axis; a fifth lens with refractive power; a sixth lens with refractive power, the object side of the sixth lens being convex at the optical axis, and the image side of the sixth lens being concave at the optical axis; the optical imaging system satisfies the following relationship: 0.5 < f1 / f26 < 1.6; where f26 is the combined focal length of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, and f1 is the effective focal length of the first lens.

[0006] Through reasonable refractive power configuration and surface shape setting, the above optical imaging system has the advantages of wide viewing angle and miniaturization of the head. On the one hand, on the premise of ensuring high imaging quality of the optical imaging system, the opening size of the screen of the electronic device can be reduced, which is conducive to the under-screen packaging of the optical imaging system, and thus conducive to the electronic device achieving the visual effect of a full-screen. On the other hand, in terms of shooting effect, due to the large field angle of the optical imaging system, a wider field of view can be obtained, foreground objects can be highlighted, and the user's photo-taking experience can be satisfied. Further, satisfying the above formula can ensure the miniaturization feature of the optical imaging system. If the first lens has a negative focal length, in order to achieve good performance, the aperture stop must be centered, which will lead to an increase in the aperture of the first lens and cannot meet the miniaturization requirement. If this ratio is too large, that is, the focal length of the first lens is too large, the optical power will be distributed to the following several lenses, increasing the sensitivity and being not conducive to mass production and assembly.

[0007] In some embodiments, the image sides and object sides of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical surfaces.

[0008] In this way, the aspherical surface shape is conducive to correcting aberration and improving imaging quality.

[0009] In some embodiments, the optical imaging system satisfies the following relationship: TTL / Imgh < 1.8; where TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and Imgh is half of the image height corresponding to the maximum field angle of the optical imaging system. Satisfying the above formula, since the ratio of TTL to Imgh is less than 1.8, the size of the total system length can be ensured when the image plane is fixed, meeting the miniaturization requirement.

[0010] In some embodiments, the optical imaging system satisfies the following relationship: 1.4 < TTL / f < 2; where TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and f is the effective focal length of the optical imaging system. Satisfying the above formula helps to determine the optional range of the focal length when the total system length meets the miniaturization requirement. If it is higher than the upper limit, for the same field angle, the total system length is too large, which is not conducive to miniaturization; if it is lower than the lower limit, it will cause the optical system to tend to be telephoto, resulting in a smaller field angle and unable to obtain enough object-side information.

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

[0012] tan(HFOV) > 1.05; where HFOV is half of the maximum field of view of the optical imaging system. Choosing this ratio appropriately maintains the wide-angle and small-head characteristics of the optical imaging system; if this ratio is too small, the field of view (FOV) will be too small, failing to achieve the wide-angle characteristic, and will also lead to an increase in focal length, which in turn will increase the aperture of the first lens, thus failing to meet the small-head characteristic.

[0013] In some embodiments, the optical imaging system satisfies the following relationship: FNO < 2.8; where FNO is the aperture number of the optical imaging system. Satisfying this formula allows for both a small aperture and high light throughput in the optical imaging system. When the light throughput of the optical imaging system is high per unit time, clear imaging can be achieved even in low-light environments. If FNO is too high, it leads to a decrease in both the diffraction limit and the light throughput, which is detrimental to shooting in low-light environments.

[0014] In some embodiments, the optical imaging system satisfies the following relationship: (L61-L62) / (2*L63)>0.25, where L61 represents the maximum vertical distance from the optical axis to the intersection point of the edge field of view and the image-side surface of the sixth lens; L62 represents the minimum vertical distance from the optical axis to the intersection point of the edge field of view and the image-side surface of the sixth lens; the edge field of view is the beam incident on and converged to the point farthest from the optical axis on the imaging surface of the optical imaging system; L63 represents the maximum vertical distance from the optical axis to the intersection point of the center field of view and the image-side surface of the sixth lens; the center field of view is the beam incident on and converged to the center of the imaging surface of the optical imaging system. Satisfying the above formula helps to ensure the relative brightness of the optical imaging system, so that even when shooting in a dark environment, the edges of the optical imaging system can achieve a clear imaging effect. If the above formula is not satisfied, it may lead to vignetting, which is not conducive to stable mass production in the later stage.

[0015] In some embodiments, the optical imaging system satisfies the following relationship: (r11+r12) / (r11-r12)<15; where r11 is the radius of curvature of the object-side surface of the sixth lens at the optical axis, and r12 is the radius of curvature of the image-side surface of the sixth lens at the optical axis. Satisfying the above formula allows the optical imaging system to match the chief ray angle (CRA) of the photosensitive element very well. If this ratio requirement is not met, the CRA of the inner field of view cannot be made large, and the matching with the CRA of the photosensitive element will have problems, failing to meet mass production requirements.

[0016] In some embodiments, the optical imaging system further includes an aperture stop located on the object side of the first lens.

[0017] Thus, the aperture is positioned relatively forward in the entire optical imaging system, giving the optical imaging system a telecentric effect and increasing the efficiency of the photosensitive element in receiving images, thereby improving image quality.

[0018] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all made of plastic.

[0019] In this way, plastic lenses can reduce the weight of optical imaging systems and lower production costs.

[0020] An embodiment of the present invention provides an image acquisition module, including the optical imaging system described in any of the above embodiments; and a photosensitive element disposed on the image side of the optical imaging system.

[0021] The imaging module of this invention includes an optical imaging system, which, through reasonable refractive force configuration and surface design, simultaneously possesses the advantages of a wide viewing angle and a miniaturized head. On the one hand, it can reduce the size of the screen opening of the electronic device while ensuring high imaging quality of the optical imaging system, thereby facilitating under-screen packaging of the optical imaging system and enabling the electronic device to achieve a full-screen visual effect. On the other hand, in terms of shooting effect, because the optical imaging system has a large field of view, a wider field of view can be obtained, highlighting foreground objects and satisfying the user's photography experience.

[0022] An embodiment of the present invention provides an electronic device, comprising: a housing and an image-capturing module as described above, wherein the image-capturing module is mounted on the housing.

[0023] The electronic device of this invention includes an image-capturing module. The optical imaging system within this module possesses the advantages of both a wide viewing angle and a miniaturized head. While ensuring high image quality, the size of the screen opening is reduced, facilitating under-display packaging of the optical imaging system and enabling a full-screen visual effect. In terms of shooting performance, the large field of view of the optical imaging system provides a wider field of view, highlighting foreground objects and enhancing the user's photography experience. This electronic device not only has good imaging capabilities but also increases the screen-to-body ratio. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the optical imaging system according to the first embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the first embodiment of the present invention.

[0026] Figure 3This is a schematic diagram of the optical imaging system according to the second embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the second embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the optical imaging system according to the third embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the third embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the optical imaging system according to the fourth embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the fourth embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of the optical imaging system according to the fifth embodiment of the present invention.

[0033] Figure 10 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the fifth embodiment of the present invention.

[0034] Figure 11 This is a schematic diagram of the optical imaging system according to the sixth embodiment of the present invention.

[0035] Figure 12 This is a schematic diagram of spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical imaging system in the sixth embodiment of the present invention.

[0036] Figure 13 This is a schematic diagram of the imaging module according to an embodiment of the present invention.

[0037] Figure 14 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0038] Explanation of main component symbols

[0039] Electronic devices 1000

[0040] Image capture module 100

[0041] Optical Imaging System 10

[0042] First lens L1

[0043] Second lens L2

[0044] Third lens L3

[0045] Fourth lens L4

[0046] Fifth lens L5

[0047] Sixth lens L6

[0048] Infrared filter L7

[0049] STO aperture

[0050] Side surfaces S1, S3, S5, S7, S9, S11, S13

[0051] Like the side profiles S2, S4, S6, S8, S10, S12, and S14.

[0052] Image S15

[0053] Photosensitive element 20

[0054] Casing 200 Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0060] First, the terminology used in the embodiments of this application will be explained:

[0061] Field of view (FOV): In optical instruments, the field of view is the angle formed by the two edges of the maximum range through which the image of the subject can be captured, with the lens of the instrument as the vertex. The size of the field of view determines the field of view of the optical instrument; the larger the field of view, the larger the field of view. That is, objects within the field of view can be photographed through the lens, while objects outside the field of view are not visible. The entire visible range corresponds one-to-one with the imaging plane of the optical instrument. On the imaging plane, it is uniformly distributed into N parts outward from the optical axis. The light rays of the central field of view converge at the optical axis and are denoted as the 0 field of view. The light rays of the peripheral field of view converge at the point farthest from the axis and are denoted as the 1.0 field of view. 0–0.5 is the inner field of view, and 0.6–1.0 is the outer field of view.

[0062] Please see Figure 1 The optical imaging system 10 of this embodiment of the invention includes, from the object side to the image side, a first lens L1 with positive 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 refractive power; and a sixth lens L6 with refractive power.

[0063] The first lens L1 has an object-side surface S1 and an image-side surface S2, with the object-side surface S1 being convex at the optical axis; 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, with the image-side surface S8 being convex at the optical axis; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; and the sixth lens L6 has an object-side surface S11 and an image-side surface S12, with the object-side surface S11 being convex at the optical axis and the image-side surface S12 being concave at the optical axis. Additionally, the optical imaging system 10 also has an image surface S15 on the image side, preferably, which can be the receiving surface of a photosensitive element.

[0064] The optical imaging system 10 satisfies the following relationship:

[0065] tan(HFOV) > 1.05;

[0066] Wherein, HFOV is half of the maximum field of view of the optical imaging system 10, that is, tan(HFOV) can be any value greater than 1.05, for example, 1.21, 1.22, etc.

[0067] The aforementioned optical imaging system 10, through its reasonable refractive force configuration and surface design, simultaneously possesses the advantages of a wide viewing angle and a miniaturized head. On the one hand, it can reduce the size of the screen opening of the electronic device while ensuring the high imaging quality of the optical imaging system 10, thereby facilitating under-display packaging of the optical imaging system 10 and achieving a full-screen visual effect. On the other hand, in terms of shooting effect, because the optical imaging system 10 has a large field of view, it can obtain a wider field of view, highlighting foreground objects and satisfying the user's photography experience.

[0068] Satisfying the above formula can maintain the wide-angle and small-head characteristics of the optical imaging system 10; if this value is too small, the field of view (FOV) will be too small, and the wide-angle characteristic cannot be achieved. At the same time, it will lead to an increase in focal length, which in turn will increase the aperture of the first lens L1, and the small-head characteristic cannot be satisfied.

[0069] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject 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 and the sixth lens L6 in sequence, and finally converges onto the image plane S15.

[0070] In some embodiments, the optical imaging system 10 further includes an infrared filter L7, which has an object-side surface S13 and an image-side surface S14. The infrared filter L7 is disposed on the image-side surface S12 of the sixth lens L6. The infrared filter L7 is used to filter the light for imaging, specifically to block infrared light and prevent infrared light from being received by the photosensitive element, thereby preventing infrared light from affecting the color and sharpness of the normal image, and thus improving the imaging quality of the optical imaging system 10.

[0071] In some embodiments, the optical imaging system 10 further includes an aperture stop STO. The aperture stop STO can be disposed on the object side of the first lens L1, between the sixth lens L6 and the infrared filter L7, between any two lenses, or on the surface of any lens. The aperture stop STO is used to reduce stray light, which helps to improve image quality. Preferably, the aperture stop STO is disposed in front of the first lens L1. In some embodiments, the aperture stop STO is disposed on the object side of the first lens L1, that is, between the subject and the first lens L1, or on the object side surface of the first lens L1. In this case, the aperture stop STO is positioned relatively forward in the entire optical imaging system 10, giving the optical imaging system 10 a telecentric effect and increasing the efficiency of the photosensitive element in receiving images, thereby improving image quality.

[0072] In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. In this case, the plastic lenses can reduce the weight of the optical imaging system 10 and lower the manufacturing cost.

[0073] In some embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 are all made of glass. In this case, the optical imaging system 10 can withstand higher temperatures and has better optical performance. In other embodiments, only the first lens L1 may be made of glass, while the other lenses are made of plastic. In this case, the first lens L1, which is closest to the object side, can better adapt to the influence of the object-side ambient temperature, and because the other lenses are made of plastic, the optical imaging system 10 maintains a lower production cost. Alternatively, in some embodiments, the first lens L1 may be made of glass, while the materials of the other lenses can be arbitrarily combined. Thus, by rationally configuring the materials of the lenses, the optical imaging system 10 can achieve ultra-thinness while correcting aberrations and solving problems such as temperature drift, and at a lower cost.

[0074] In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspherical. For example, in some embodiments, the image-side and object-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging system 10 are all aspherical. The aspherical surface shape is beneficial for correcting aberrations and improving image quality.

[0075] The shape of an aspherical surface is determined by the following formula:

[0076]

[0077] Where Z is the longitudinal distance between any point on the aspherical surface and the vertex of the surface, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (the reciprocal of the radius of curvature), k is the conic constant, and Ai is the i-th order correction coefficient of the aspherical surface.

[0078] In this way, the optical imaging system 10 can effectively reduce its size and effectively correct aberrations by adjusting the radius of curvature and aspherical coefficient of each lens surface, thereby improving the imaging quality.

[0079] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0080] TTL / Imgh < 1.8;

[0081] Wherein, TTL is the distance on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10 (total system length), and Imgh is half of the image height corresponding to the maximum field of view of the optical imaging system. That is, TTL / Imgh can be any value less than 1.8, such as 1.37, 1.40, 1.41, 1.40, 1.42, 1.37, etc.

[0082] If the above formula is satisfied, since the ratio of TTL to Imgh is less than 1.8, the total length of the system can be guaranteed under the condition that the image plane S15 is fixed, thus achieving the miniaturization requirement; if this ratio requirement is not met, the total length of the system will be too long, and miniaturization cannot be achieved.

[0083] In some embodiments, the optical imaging system satisfies the following relationship:

[0084] 1.4 <TTL / f<2;

[0085] Wherein, TTL is the distance on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10, and f is the effective focal length of the optical imaging system 10. That is, TTL / f can be any value in the range of (1.4, 2), such as 1.63, 1.64, 1.67, 1.68, 1.70, etc.

[0086] Satisfying the above formula helps determine the selectable range of focal lengths while ensuring the overall system length meets the miniaturization requirements. If this range is not met, a focal length that is too small will result in a large field of view, which would require a longer overall system length. Conversely, a focal length that is too large will result in a small field of view, which would also require an increase in the overall system length to meet performance requirements.

[0087] In some embodiments, the optical imaging system satisfies the following relationship:

[0088] 0.5 <f1 / f26<1.6;

[0089] Where f26 is the combined focal length of the second lens L2 to the sixth lens L6, that is, the combined focal length of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, and f1 is the effective focal length of the first lens L1. That is, f1 / f26 can be any value in the range of (0.5, 1.6), for example, values ​​such as 1.02, 1.21, 0.96, 1.14, 1.46, 1.26, etc.

[0090] Satisfying the above formula can ensure the miniaturization of the optical imaging system 10. If the first lens L1 has a negative focal length, the aperture must be centered in order to achieve good performance, which will result in an increase in the aperture of the first lens L1, making it impossible to meet the miniaturization requirement. If this ratio is too large, that is, the focal length of the first lens L1 is too large, it will cause the optical power to be distributed to the following lenses, increasing sensitivity and making it difficult to assemble and mass-produce.

[0091] In some embodiments, the optical imaging system satisfies the following relationship:

[0092] FNO < 2.8;

[0093] Wherein, FNO is the aperture number of the optical imaging system 10. That is, FNO can be any value less than 2.8, such as 2.45, 2.60, etc.

[0094] By satisfying the above formula, a large light throughput of the optical imaging system 10 can be achieved while maintaining a small head size. When the light throughput of the optical imaging system 10 is large per unit time, a clear imaging effect can be achieved even when shooting in relatively dark environments. If the FNO is too large, it will lead to a decrease in the diffraction limit and a reduction in light throughput, which is not conducive to shooting in relatively dark environments.

[0095] In some embodiments, the optical imaging system satisfies the following relationship:

[0096] (L61-L62) / (2*L63)>0.25;

[0097] Please see again Figure 1 L61 represents the maximum vertical distance from the optical axis to the intersection point of the edge field of view and the image-side surface S12 of the sixth lens L6; L62 represents the minimum vertical distance from the optical axis to the intersection point of the edge field of view and the image-side surface S12 of the sixth lens L6; the edge field of view is the beam incident on and converged to the point farthest from the optical axis on the imaging surface of the optical imaging system 10; L63 represents the maximum vertical distance from the optical axis to the intersection point of the center field of view and the image-side surface S12 of the sixth lens L6; the center field of view is the beam incident on and converged to the center of the imaging surface of the optical imaging system 10.

[0098] Satisfying the above formula helps ensure the relative brightness of the optical imaging system 10, so that even when shooting in darker environments, the edges of the optical imaging system 10 can achieve a clear imaging effect. If the above formula is not satisfied, it may lead to vignetting, which is not conducive to stable mass production in the later stages.

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

[0100] (r11+r12) / (r11-r12)<15;

[0101] Where r11 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis, and r12 is the radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis. That is, (r11+r12) / (r11-r12) can be any value less than 15, such as -546.12, 5.09, 7.45, 7.82, 6.90, 10.30, etc.

[0102] Satisfying the above formula ensures that the optical imaging system 10 can be well matched with the chief ray angle (CRA) of the photosensitive element. If this ratio requirement is not met, the CRA of the inner field of view cannot be made large, and there will be problems with the matching with the CRA of the photosensitive element, which will not meet the requirements for mass production.

[0103] First Embodiment

[0104] Please refer to Figure 1 and Figure 2The optical imaging system 10 of the first embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive 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 negative refractive power, and an infrared filter L7.

[0105] Among them, the object-side surface S1 of the first lens L1 is convex 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 concave at the optical axis; the object-side surface S7 of the fourth lens L4 is concave 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 concave at the optical axis.

[0106] The object-side surface S1 of the first lens L1 is concave 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 concave 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 convex at the circumference, and the image-side surface S12 is convex at the circumference.

[0107] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0108] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0109] The optical imaging system of the first embodiment meets the following conditions: tan(HFOV)=1.21, TTL / Imgh=1.37, TTL / f=1.63, f1 / f26=1.02, FNO=2.45, (L61-L62) / (2*L63)=0.32, (r11+r12) / (r11-r12)=6.90.

[0110] The reference wavelength in the first embodiment is 587 nm, and the optical imaging system 10 in the first embodiment satisfies the conditions in the table below. The elements from the object plane to the image plane S15 are arranged sequentially according to the order of the elements in Table 1 from top to bottom. Surface numbers 1 and 2 are the object-side surface S1 and image-side surface S2 of the first lens L1, respectively; that is, in the same lens, the surface with the smaller surface number is the object-side surface, and the surface with the larger surface number is the image-side surface. The Y-radius in Table 1 is the radius of curvature of the object-side or 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 on the optical axis from the image-side surface of the first lens to the object-side surface of the next lens. Table 2 is a table of relevant parameters for the aspherical surfaces of each lens in Table 1, where K is the conic constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0111] Table 1

[0112]

[0113] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0114] Table 2

[0115] Face number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -1.7870 -0.0600 0.1264 -4.1726 47.2284 -326.0259 1390.0988 -3604.9844 5229.8543 -3266.4588 2 37.6561 -0.1839 -0.3966 3.0482 -21.5481 90.4546 -236.4204 377.7106 -336.7218 128.0101 3 -67.2116 -0.0962 0.0920 -2.6518 9.6315 -20.8066 22.8802 -9.6364 0.0000 0.0000 4 -10.0684 -0.1382 0.5435 -2.4026 4.1061 -4.0947 2.4810 -0.7247 0.0000 0.0000 5 82.1620 -0.4090 0.3399 0.3550 -7.0334 23.2957 -35.8331 29.3838 -12.4917 2.1538 6 4.4683 -0.3800 0.7279 -0.9424 -0.6307 3.5705 -4.6154 2.9129 -0.9283 0.1191 7 -4.9879 -0.3642 1.2450 -0.8331 -2.6255 6.4317 -6.4658 3.4772 -0.9790 0.1131 8 -3.2284 -0.3486 1.2357 -3.3061 5.7262 -6.4636 4.7184 -2.1418 0.5498 -0.0609 9 -99.0000 0.6052 -0.7182 0.3164 0.1107 -0.2469 0.1554 -0.0503 0.0084 -0.0006 10 1.1450 0.7799 -1.2381 1.0996 -0.6622 0.2696 -0.0715 0.0117 -0.0011 0.0000 11 -4.5530 0.0804 -0.3427 0.2185 -0.0470 -0.0055 0.0048 -0.0010 0.0001 0.0000 12 -3.4095 -0.0536 -0.1144 0.1139 -0.0470 0.0107 -0.0014 0.0001 0.0000 0.0000

[0116] in Figure 2 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0117] Second Embodiment

[0118] 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, an aperture STO, a first lens L1 with positive 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 negative refractive power, and an infrared filter L7.

[0119] Among them, 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 convex 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 concave 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 concave 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 concave at the optical axis.

[0120] The object-side surface S1 of the first lens L1 is concave 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 concave 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 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.

[0121] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0122] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0123] The optical imaging system 10 of the second embodiment meets the following conditions: tan(HFOV)=1.22, TTL / Imgh=1.40, TTL / f=1.67, f1 / f26=1.21, FNO=2.45, (L61-L62) / (2*L63)=0.36, (r11+r12) / (r11-r12)=7.45.

[0124] In the second embodiment, the reference wavelength is 587nm. The parameters of the optical imaging system 10 are given in Tables 3 and 4, and the definitions of each parameter can be derived from the first embodiment, so they will not be repeated here.

[0125] Table 3

[0126]

[0127]

[0128] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0129] Table 4

[0130] Face number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -0.0679 -0.0506 0.2082 -6.4236 82.0765 -625.7980 2915.6074 -8167.2645 12640.0459 -8309.6402 2 18.3090 -0.1476 -0.2639 1.5520 -11.9852 51.3008 -135.3960 216.1839 -190.9766 71.4160 3 -53.0210 -0.1065 0.0859 -2.1893 7.3737 -15.1756 15.2152 -5.6460 0.0000 0.0000 4 -99.0000 -0.1088 0.3497 -1.6846 2.7473 -2.3343 1.1099 -0.2827 0.0000 0.0000 5 102.1620 -0.3556 0.6490 -2.5430 4.7712 -4.7187 4.2963 -4.7252 3.3502 -0.9415 6 5.4582 -0.3187 0.7611 -1.6909 2.0301 -1.3134 0.4973 -0.1491 0.0482 -0.0093 7 1.6296 -0.2815 0.6731 0.4671 -3.9226 6.4685 -5.3301 2.4499 -0.6045 0.0629 8 -2.7974 -0.1772 0.3041 -0.4720 0.3579 0.0603 -0.3882 0.3362 -0.1243 0.0172 9 -86.3552 0.5101 -0.5300 0.3000 -0.1164 0.0325 -0.0066 0.0009 -0.0001 0.0000 10 1.1450 0.6100 -0.7179 0.4711 -0.2081 0.0632 -0.0128 0.0017 -0.0001 0.0000 11 -4.0089 0.1027 -0.2273 0.1099 -0.0189 -0.0015 0.0012 -0.0002 0.0000 0.0000 12 -3.1451 -0.0017 -0.1046 0.0692 -0.0217 0.0039 -0.0004 0.0000 0.0000 0.0000

[0131] in Figure 4 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0132] Third Embodiment

[0133] 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, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative 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 negative refractive power, and an infrared filter L7.

[0134] Among them, the object-side surface S1 of the first lens L1 is convex 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 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 concave 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 concave at the optical axis.

[0135] The object-side surface S1 of the first lens L1 is concave 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 concave 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 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.

[0136] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0137] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0138] The optical imaging system 10 of the third embodiment meets the following conditions: tan(HFOV)=1.21, TTL / Imgh=1.41, TTL / f=1.68, f1 / f26=0.96, FNO=2.45, (L61-L62) / (2*L63)=0.35, (r11+r12) / (r11-r12)=7.82.

[0139] Table 5

[0140]

[0141] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0142] Table 6

[0143] Face number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -0.1548 -0.0536 0.2682 -7.0831 84.6175 -612.2649 2737.1290 -7424.7654 11215.7032 -7245.7835 2 18.3090 -0.1339 -0.4101 3.6150 -26.4826 113.3799 -299.7440 478.0511 -421.5499 157.8797 3 -53.0210 -0.0970 -0.0989 -0.6503 0.9122 -0.4579 -1.8420 2.0301 0.0000 0.0000 4 0.0000 -0.1446 0.1777 -0.0528 -1.7510 3.5047 -2.5702 0.6201 0.0000 0.0000 5 82.1620 -0.3327 0.1698 -0.0786 -0.0583 -2.0626 8.1024 -11.3814 7.1299 -1.7077 6 5.3955 -0.2237 0.1286 0.3169 -1.6714 3.1036 -3.0028 1.6203 -0.4632 0.0545 7 1.4299 -0.2005 0.2706 1.0861 -4.1876 6.2822 -5.1258 2.3978 -0.6060 0.0643 8 -2.7441 -0.1885 0.4402 -0.9810 1.4111 -1.3342 0.8039 -0.2889 0.0560 -0.0045 9 -81.9399 0.4843 -0.4698 0.2121 -0.0439 -0.0038 0.0051 -0.0015 0.0002 0.0000 10 1.1450 0.6150 -0.7348 0.4776 -0.2053 0.0602 -0.0118 0.0015 -0.0001 0.0000 11 -3.9232 0.1229 -0.2774 0.1616 -0.0482 0.0083 -0.0008 0.0000 0.0000 0.0000 12 -3.1147 0.0031 -0.1231 0.0870 -0.0305 0.0064 -0.0008 0.0001 0.0000 0.0000

[0144] in Figure 6 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0145] Fourth embodiment

[0146] Please refer to Figure 7 and Figure 8 The optical imaging system 10 of the fourth embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive 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 an infrared filter L7.

[0147] Among them, 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 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 concave 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; and the object-side surface S11 of the sixth lens L6 is convex at the optical axis, and the image-side surface S12 is concave at the optical axis.

[0148] The object-side surface S1 of the first lens L1 is concave 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 convex at the circumference, and the image-side surface S12 is convex at the circumference.

[0149] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0150] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0151] The optical imaging system 10 of the fourth embodiment meets the following conditions: tan(HFOV)=1.22, TTL / Imgh=1.40, TTL / f=1.70, f1 / f26=1.14, FNO=2.45, (L61-L62) / (2*L63)=0.37, (r11+r12) / (r11-r12)=-546.12.

[0152] Table 7

[0153]

[0154] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0155] Table 8

[0156] Face number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 0.2814 -0.0656 0.9673 -21.4019 252.706 -1805.146 7948.144 -21128.612 31112.477 -19498.847 2 23.9458 -0.1067 -0.6178 5.7570 -41.788 180.5160 -485.500 791.8068 -717.0294 277.0186 3 -72.4485 -0.2156 0.8143 -5.1042 13.6959 -21.2027 14.0813 -1.7154 0.0000 0.0000 4 -84.8419 -0.2271 -0.6357 4.0767 -11.268 15.0536 -9.6033 2.3209 0.0000 0.0000 5 98.2930 -0.1058 -1.1912 1.8132 5.9390 -33.8633 69.7828 -73.0219 38.6863 -8.2891 6 0.0000 0.2489 -1.5707 4.6091 -8.6466 10.0082 -7.0281 2.9181 -0.6596 0.0625 7 -2.1692 -0.1644 -0.2831 3.5991 -9.0353 11.0663 -7.5944 2.9659 -0.6112 0.0509 8 -2.7599 -0.1491 -0.0578 0.6183 -1.2790 1.4617 -1.0608 0.4917 -0.1311 0.0151 9 -33.8660 0.5104 -0.4649 0.1776 -0.0037 -0.0276 0.0127 -0.0028 0.0003 0.0000 10 1.1499 0.4149 -0.5284 0.3462 -0.1489 0.0432 -0.0083 0.0010 -0.0001 0.0000 11 -3.6934 0.1465 -0.2715 0.1361 -0.0305 0.0022 0.0004 -0.0001 0.0000 0.0000 12 -3.4484 0.0604 -0.1698 0.0990 -0.0293 0.0052 -0.0006 0.0000 0.0000 0.0000

[0157] in Figure 8 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0158] Fifth embodiment

[0159] Please refer to Figure 9 and Figure 10The optical imaging system 10 of the fifth embodiment includes, from the object side to the image side, an aperture sTO, a first lens L1 with positive 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 positive refractive power, a sixth lens L6 with negative refractive power, and an infrared filter L7.

[0160] Among them, the object-side surface S1 of the first lens L1 is convex 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 concave at the optical axis; the object-side surface S7 of the fourth lens L4 is concave 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 concave at the optical axis.

[0161] The object-side surface S1 of the first lens L1 is concave 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 concave 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 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.

[0162] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0163] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0164] The optical imaging system 10 of the fifth embodiment meets the following conditions: tan(HFOV)=1.21, TTL / Imgh=1.42, TTL / f=1.68, f1 / f26=1.46, FNO=2.45, (L61-L62) / (2*L63)=0.33, (r11+r12) / (r11-r12)=5.09.

[0165] Table 9

[0166]

[0167]

[0168] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0169] Table 10

[0170] Face number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -1.6629 -0.0664 0.2067 -5.2516 59.5857 -419.1291 1839.0705 -4920.9021 7357.4534 -4719.0323 2 33.7221 -0.1954 -0.4000 2.9819 -19.2743 76.5153 -189.9749 287.7766 -242.6256 86.8394 3 -54.1010 -0.0587 -0.1987 -1.0023 4.1266 -9.6665 11.2839 -5.0713 0.0000 0.0000 4 -5.4404 -0.0256 -0.0235 -0.6321 1.1566 -1.2008 0.8675 -0.3159 0.0000 0.0000 5 82.2121 -0.3343 0.2736 -0.5696 -0.6791 5.5090 -9.5442 7.7607 -3.1062 0.4837 6 4.7055 -0.2601 0.1734 0.1954 -1.4856 3.0051 -3.0220 1.6540 -0.4718 0.0547 7 -6.5730 -0.0069 -0.3853 2.2805 -5.3730 6.7967 -5.0409 2.2047 -0.5270 0.0530 8 -2.3212 -0.2993 0.5507 -0.7872 0.7917 -0.5464 0.2513 -0.0764 0.0160 -0.0019 9 -99.0000 0.1479 0.0832 -0.3588 0.3689 -0.2094 0.0727 -0.0154 0.0018 -0.0001 10 13.3429 0.5352 -0.6764 0.4632 -0.2085 0.0631 -0.0126 0.0016 -0.0001 0.0000 11 -3.2313 0.0972 -0.2384 0.1393 -0.0410 0.0068 -0.0006 0.0000 0.0000 0.0000 12 -2.9546 -0.0190 -0.0877 0.0639 -0.0222 0.0046 -0.0006 0.0001 0.0000 0.0000

[0171] in Figure 10 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0172] Sixth Embodiment

[0173] Please refer to Figure 11 and Figure 12 The optical imaging system 10 of the sixth embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive 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 an infrared filter L7.

[0174] Among them, the object-side surface S1 of the first lens L1 is convex 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 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 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 concave at the optical axis.

[0175] The object-side surface S1 of the first lens L1 is concave 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 concave 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 convex at the circumference, and the image-side surface S12 is convex at the circumference.

[0176] The object-side surface and image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical.

[0177] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic. The infrared filter L7 is made of glass.

[0178] The optical imaging system 10 of the sixth embodiment meets the following conditions: tan(HFOV)=1.21, TTL / Imgh=1.37, TTL / f=1.64, f1 / f26=1.26, FNO=2.60, (L61-L62) / (2*L63)=0.35, (r11+r12) / (r11-r12)=10.30.

[0179] Table 11

[0180]

[0181] It should be noted that EFL 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 on the optical axis from the object surface S1 of the first lens L1 to the image surface S15 of the optical imaging system 10.

[0182] Table 12

[0183]

[0184]

[0185] in Figure 12 S is the astigmatic curve in the sagittal direction, and T is the astigmatic curve in the meridional direction.

[0186] Please refer to Figure 13 The imaging module 100 of this embodiment includes an optical imaging system 10 and a photosensitive element 20, with the photosensitive element 20 disposed on the image side of the optical imaging system 10.

[0187] Specifically, the photosensitive element 20 may be a complementary metal-oxide-semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0188] The imaging module 100 of this invention includes an optical imaging system 10, which, through reasonable refractive force configuration and surface design, simultaneously possesses the advantages of a wide viewing angle and a miniaturized head. On the one hand, while ensuring high imaging quality of the optical imaging system 10, the size of the opening in the electronic device screen can be reduced, thereby facilitating under-screen packaging of the optical imaging system 10 and enabling the electronic device to achieve a full-screen visual effect. On the other hand, in terms of shooting effect, because the optical imaging system 10 has a large field of view, a wider field of view can be obtained, highlighting foreground objects and satisfying the user's photography experience.

[0189] Please refer to Figure 14 The electronic device 1000 of this embodiment includes a housing 200 and an image acquisition module 100, which is mounted on the housing 200 for acquiring images.

[0190] The electronic device 1000 of this invention includes, but is not limited to, a smartphone (such as...). Figure 14 Electronic devices that support imaging, such as car cameras, surveillance cameras, tablets, laptops, e-book readers, portable multimedia players (PMPs), portable telephones, video telephones, digital still cameras, mobile medical devices, and wearable devices.

[0191] The optical imaging system 10 in the electronic device 1000 described above, through its reasonable refractive force configuration and surface design, simultaneously possesses the advantages of a wide viewing angle and a miniaturized head. On one hand, while ensuring high imaging quality, the aperture size of the electronic device screen can be reduced, thereby facilitating under-display packaging of the optical imaging system 10 and enabling the electronic device 1000 to achieve a full-screen visual effect. On the other hand, in terms of shooting effect, because the optical imaging system 10 has a large field of view, a wider field of view can be obtained, highlighting foreground objects and satisfying the user's photography experience. This electronic device 1000 not only has good imaging capabilities but also improves the screen-to-body ratio.

[0192] 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 invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be incorporated into the present invention.

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An optical imaging system, characterized in that, There are six refractive lenses in total, which are arranged from the object side to the image side as follows: A first lens having positive refractive power, wherein the object side of the first lens is convex at the optical axis; A second lens with refractive power; A third lens with refractive power; A fourth lens with positive refractive power, wherein the image-side surface of the fourth lens is convex at the optical axis; A fifth lens with refractive power; A sixth lens with refractive power, wherein the object-side surface of the sixth lens is convex at the optical axis and the image-side surface of the sixth lens is concave at the optical axis; The optical imaging system satisfies the following relationship: 0.96 ≤ f1 / f26 < 1.6; Wherein, f26 is the combined focal length of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and f1 is the effective focal length of the first lens.

2. The optical imaging system as described in claim 1, characterized in that, The image-side and object-side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all aspherical.

3. The optical imaging system as described in claim 1, characterized in that, The optical imaging system satisfies the following relationship: 1.37≤TTL / Imgh<1.8; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the image plane of the optical imaging system, and Imgh is half of the image height corresponding to the maximum field of view of the optical imaging system.

4. The optical imaging system as described in claim 1, characterized in that, The optical imaging system satisfies the following relationship: 1.4 <TTL / f <2; Where TTL is the distance on the optical axis from the object side of the first lens to the image plane of the optical imaging system, and f is the effective focal length of the optical imaging system.

5. The optical imaging system as described in claim 1, characterized in that, The optical imaging system satisfies the following relationship: 1.22 ≥ tan(HFOV) > 1.05; HFOV is half of the maximum field of view of the optical imaging system.

6. The optical imaging system as claimed in claim 1, characterized in that, The optical imaging system satisfies the following relationship: 2.45≤FNO<2.8; Wherein, FNO is the aperture number of the optical imaging system.

7. The optical imaging system as claimed in claim 1, characterized in that, The optical imaging system satisfies the following relationship: 0.37≥(L61-L62) / (2 L63)>0.25 Wherein, L61 represents the maximum vertical distance from the optical axis to the intersection point of the edge field of view and the image side surface of the sixth lens; L62 represents the minimum vertical distance from the optical axis to the intersection point of the edge field of view and the image side surface of the sixth lens; the edge field of view is the light beam incident on and converged to the point farthest from the optical axis on the imaging surface of the optical imaging system; L63 represents the maximum vertical distance from the optical axis to the intersection point of the center field of view and the image side surface of the sixth lens; the center field of view is the light beam incident on and converged to the center of the imaging surface of the optical imaging system.

8. The optical imaging system as claimed in claim 1, characterized in that, The optical imaging system satisfies the following relationship: (r11+r12) / (r11-r12) <15； Wherein, r11 is the radius of curvature of the object side of the sixth lens at the optical axis, and r12 is the radius of curvature of the image side of the sixth lens at the optical axis.

9. The optical imaging system as claimed in claim 1, characterized in that, The optical imaging system further includes an aperture stop located on the object side of the first lens.

10. The optical imaging system as claimed in claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all made of plastic.

11. An image acquisition module, characterized in that, include: The optical imaging system as described in any one of claims 1 to 10; and A photosensitive element is disposed on the image side of the optical imaging system.

12. An electronic device, characterized in that, include: case; and The imaging module as described in claim 11 is mounted on the housing.

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