Optical imaging system, imaging module and electronic device

Abstract

The present invention proposes an optical imaging system, an imaging module and an electronic device, wherein the optical imaging system comprises, from the object side to the image side, in order: a first lens with negative refractive power; a second lens with refractive power; a third lens with positive refractive power; a fourth lens with refractive power; a fifth lens with negative refractive power; and a sixth lens with positive refractive power. The optical imaging system satisfies the following conditional formula: 87.0° / mm<FOV / f≤128.0° / mm; wherein FOV is the maximum field of view angle of the optical imaging system, and f is the effective focal length of the optical imaging system. The optical imaging system, the imaging module and the electronic device of the embodiments of the present invention, through the above-mentioned reasonable configuration of refractive power, enable the optical imaging system to have both a wide viewing angle and good imaging quality.

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] At present, wide-angle optical camera lenses have been widely introduced in smart phones and smart electronic devices. The problem of obvious edge field distortion of wide-angle lenses has attracted the attention of consumers and terminal manufacturers. In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the larger the field angle of the optical camera lens, the more obvious the edge distortion, which affects the image quality. How to make the optical camera lens have a wide viewing angle and good image quality at the same time is a problem that technicians in this field need to solve urgently. Summary of the invention

[0003] 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.

[0004] The embodiment of the present application provides an optical imaging system, which includes, from the object side to the image side, the following:

[0005] a first lens element having negative refractive power;

[0006] a second lens having refractive power;

[0007] a third lens element having positive refractive power;

[0008] a fourth lens having a refractive power;

[0009] a fifth lens element having negative refractive power; and

[0010] a sixth lens element having positive refractive power;

[0011] The optical imaging system satisfies the following conditional formula:

[0012] 87.0° / mm<FOV / f≤128.0° / mm;

[0013] Wherein, FOV is the maximum field of view of the optical imaging system, and f is the effective focal length of the optical imaging system.

[0014] If the above formula is satisfied, the optical imaging system can provide a field of view of more than 120° to effectively increase the image area. Furthermore, the field of view can reach 134.4°, and the effective focal length is reduced, which can accommodate more imaging area while having a certain macro capability. The optical imaging system of an embodiment of the present invention can enhance the optical imaging system's ability to capture low-frequency details, effectively reduce edge field distortion, and increase the aperture number through a reasonable configuration of refractive power, while achieving a wide viewing angle and high imaging quality.

[0015] In some embodiments, the object side surface of the first lens is concave at the optical axis, and the image side surface thereof is concave at the optical axis;

[0016] The object side surface of the second lens is convex at the optical axis, and the image side surface thereof is concave at the optical axis;

[0017] The object side surface of the third lens is convex at the optical axis, and the image side surface thereof is convex at the optical axis;

[0018] The object side surface of the fourth lens is concave at the optical axis, and the image side surface thereof is convex at the optical axis;

[0019] The object side surface of the fifth lens is concave on the circumference, the image side surface is concave on the circumference, and both the object side surface and the image side surface are aspherical surfaces;

[0020] The object side surface of the sixth lens is convex at the optical axis, the image side surface is concave at the optical axis, the object side surface and the image side surface are both aspherical surfaces, and at least one of the object side surface and the image side surface is provided with at least one inflection point.

[0021] The optical imaging system of the embodiment of the present invention has a wide working range through reasonable lens configuration, reduces the size of the optical imaging system while maintaining good optical performance, and realizes the miniaturization of the optical imaging system.

[0022] In some embodiments, the optical imaging system further includes an aperture stop disposed between the second lens and the third lens.

[0023] The aperture is used to reduce stray light, which helps to improve image quality. In addition, since the aperture is arranged between the second lens and the third lens, it makes it possible to achieve a large viewing angle, so that the structure of the optical imaging system has a certain symmetry, and the optical distortion is better controlled.

[0024] In some embodiments, the optical imaging system satisfies the following condition:

[0025] 4.5<SD1 / CT12<16.5;

[0026] Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side surface of the first lens to the optical axis, and CT12 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.

[0027] Satisfying the above formula, SD1 can be effectively compressed, which can reduce the head size of the optical imaging system 10 and the width of the optical imaging system perpendicular to the optical axis. Combined with the reduction of CT12, the overall volume can be compressed to a greater extent, the compactness can be improved, miniaturization can be achieved, and the risk of ghost images can be reduced. At the same time, the difficulty of arranging the structure can be reduced, and the assembly yield rate can be improved.

[0028] In some embodiments, the optical imaging system satisfies the following condition:

[0029] 2.0%<|DIS / FNO|<8.0%;

[0030] Wherein, DIS is the maximum value of the optical distortion of the optical imaging system, and FNO is the aperture number of the optical imaging system.

[0031] If the above formula is satisfied, the aperture number FNO can be increased and a field of view exceeding 120° can be obtained. In this case, the overall structure of the optical imaging system is reasonably controlled to reduce the optical distortion. Thus, the distortion at the edge of wide-angle shooting can be reduced to obtain better image quality.

[0032] In some embodiments, the optical imaging system satisfies the following condition:

[0033] CT45 / ET5<0.30;

[0034] Wherein, CT45 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 ET5 is the thickness of the edge of the optical effective area of ​​the fifth lens.

[0035] 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 fourth lens and the fifth lens cooperate to have a very good correction effect on chromatic aberration, and also have a good correction effect on spherical aberration, which can improve the resolution of the optical imaging system. In addition, the reduction in size provides convenience for improving the compactness of the system and compressing the optical length.

[0036] In some embodiments, the optical imaging system satisfies the following condition:

[0037] 0.2<SAG62 / R61<0.5;

[0038] Among them, SAG62 is the maximum sag height of the image side surface of the sixth lens, and R61 is the curvature radius of the object side surface of the sixth lens at the optical axis.

[0039] Satisfying the above formula, the wavy lens structure of the sixth lens provides a good refractive power distribution perpendicular to the optical axis, provides a good transition for the edge field light to be incident on the image plane, reduces the image plane incident angle, is beneficial to improve the relative brightness on the image plane, and reduces the tolerance sensitivity of the lens.

[0040] In some embodiments, the optical imaging system satisfies the following condition:

[0041] 20.0<|R41 / ET4|<71.5;

[0042] Wherein, R41 is the curvature radius of the object side of the fourth lens at the optical axis, and ET4 is the thickness of the edge of the optically effective area of ​​the fourth lens.

[0043] The above formula is satisfied, and the surface shape and thickness of the fourth lens change, so that the light shrunk by the first lens and the second lens gradually diffuses at the fourth lens, avoiding excessive deflection of the light and causing increased sensitivity.

[0044] In some embodiments, the optical imaging system satisfies the following condition:

[0045] 0.35<(CT1+CT2) / SD1<0.5;

[0046] Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and SD1 is the vertical distance from the edge of the effective area on the object side of the first lens to the optical axis.

[0047] If the above formula is satisfied, the reduction of CT1 and CT2 can reduce SD1, thereby reducing the head size of the optical imaging system, reducing the optical length of the optical imaging system, and facilitating molding and manufacturing.

[0048] In some embodiments, the optical imaging system satisfies the following condition:

[0049] 1.2≤(CT3+CT4+CT5) / BF<2.4;

[0050] 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 image side surface of the sixth lens and the image plane in the direction parallel to the optical axis.

[0051] Satisfying the above formula can ensure that the optical imaging system and the photosensitive chip have sufficient space for coordination, 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 form the symmetry of the structure, and reduce optical distortion.

[0052] In some embodiments, the optical imaging system satisfies the following condition:

[0053] 0.85<TTL / (ImgH*2)<1.1

[0054] Wherein, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half of the diagonal length of the effective imaging area of ​​the optical imaging system on the imaging plane.

[0055] Satisfying the above formula can compress the total optical length, making the structure of the optical imaging system more compact, while maintaining a reasonable distribution of lens thickness, which is conducive to molding and assembly; ImgH can be appropriately increased to gain support for chips with large image size.

[0056] 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.

[0057] The imaging module of the embodiment of the present invention includes an optical imaging system, which can enhance the optical imaging system's ability to capture low-frequency details, effectively reduce edge field distortion, and increase the aperture number through reasonable configuration of refractive power, while achieving a wide viewing angle and high imaging quality.

[0058] An embodiment of the present invention provides an electronic device, comprising: a housing and the imaging module of the above embodiment, wherein the imaging module is mounted on the housing.

[0059] The electronic device of the embodiment of the present invention includes an imaging module, which can enhance the optical imaging system's ability to capture low-frequency details, effectively reduce edge field distortion, and increase the aperture number through reasonable configuration of refractive power, while achieving a wide viewing angle and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] 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:

[0061] Figure 1 Schematic diagram of the structure of the optical imaging system according to the first embodiment of the present invention.

[0062] Figure 2 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the first embodiment of the present invention.

[0063] Figure 3 Schematic diagram of the structure of an optical imaging system according to a second embodiment of the present invention.

[0064] Figure 4 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the second embodiment of the present invention.

[0065] Figure 5 Schematic diagram of the structure of an optical imaging system according to the third embodiment of the present invention.

[0066] Figure 6 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the third embodiment of the present invention.

[0067] Figure 7 4 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

[0068] Figure 8 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the fourth embodiment of the present invention.

[0069] Fig. 9 4 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

[0070] Fig.10 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the fifth embodiment of the present invention.

[0071] Fig.11 4 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

[0072] Fig.12 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the sixth embodiment of the present invention.

[0073] Fig.13 2 is a schematic structural diagram of an optical imaging system according to a seventh embodiment of the present invention.

[0074] Fig.14 1 and 2 are the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical imaging system in the seventh embodiment of the present invention.

[0075] Fig.15 It is a structural schematic diagram of an imaging module according to an embodiment of the present invention.

[0076] Fig.16 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0077] Main component symbols

[0078] Electronic device 1000

[0079] Image acquisition module 100

[0080] Optical imaging system 10

[0081] First lens L1

[0082] Second lens L2

[0083] The third lens L3

[0084] The fourth lens L4

[0085] Fifth lens L5

[0086] Sixth lens L6

[0087] Infrared filter L7

[0088] Aperture STO

[0089] Object side S1, S3, S5, S7, S9, S11, S13

[0090] Like side S2, S4, S6, S8, S10, S12, S14

[0091] Image plane S15

[0092] Photosensitive element 20

[0093] Housing 200 DETAILED DESCRIPTION

[0094] In order to make the purpose, technical scheme 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 positive refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power.

[0100] 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 concave surface 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. The optical imaging system 10 satisfies the following relationship:

[0101] 87.0° / mm<FOV / f≤128.0° / mm;

[0102] Wherein, FOV is the maximum field of view of the optical imaging system 10, and f is the effective focal length of the optical imaging system 10, that is, FOV / f can be any value in the range of [87° / mm, 128° / mm], for example, the value can be 124.07° / mm, 91.68° / mm, 117.94° / mm, 87.86° / mm, 106.56° / mm, 120.55° / mm, 128° / mm, etc.

[0103] In the optical imaging system 10 of the embodiment of the present application, the above-mentioned reasonable configuration of the refractive power meets the wide-angle requirement of the optical imaging system 10, improves the ability of the optical imaging system 10 to capture low-frequency details, effectively reduces the edge field distortion, increases the aperture number, and can ensure that the optical imaging system 10 has good imaging quality.

[0104] If the above formula is satisfied, the optical imaging system 10 can provide a field of view exceeding 120°, so as to effectively increase the viewing area of ​​the image. Furthermore, the field of view can reach 134.4°, and the effective focal length is reduced, so that while accommodating more imaging area, it has certain macro capabilities; for example, the focusing object distance can reach 50mm; through reasonable refractive power configuration, the system's ability to capture low-frequency details can be improved, meeting the design requirements of high image quality.

[0105] In some embodiments, 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 image-side surface S8 of the fourth lens L4 is convex at the optical axis; 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, and both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0106] The optical imaging system 10 has a wide working range through reasonable lens configuration, and reduces the size of the optical imaging system 10 while maintaining good optical performance, thereby achieving miniaturization of the optical imaging system 10.

[0107] In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO can be disposed before the first lens L1, after the sixth lens L6, between any two lenses, or on the surface of any lens, or disposed thereon. The stop STO is used to reduce stray light and help improve image quality.

[0108] Preferably, the aperture STO is a central aperture, for example, Figure 1 In the embodiment, the aperture STO is arranged between the second lens L2 and the third lens L3, thereby making it possible to realize a wide viewing angle. In addition, the central aperture makes the structure of the optical imaging system 10 symmetrical to a certain extent, so that the optical distortion is better controlled.

[0109] In some embodiments, the optical imaging system 10 further includes an infrared filter L7, and the infrared filter L7 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 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.

[0110] When the optical imaging system 10 is used for imaging, 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 and the sixth lens L6 in sequence, and finally converges on the image plane S15.

[0111] 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.

[0112] 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 aspherical lenses.

[0113] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0114] 4.5<SD1 / CT12<16.5;

[0115] Among them, SD1 is the vertical distance from the edge of the optical effective area of ​​the object side surface S1 of the first lens L1 to the optical axis, which represents the head size of the optical imaging system 10 and affects the structural arrangement and assembly yield; CT12 is the 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, that is, SD1 / CT12 can be any value in the range of (4.5, 16.5), for example, 16.38, 5.59, 6.28, 8.19, 4.80, 5.18, 8.67, etc.

[0116] Satisfying the above formula, effectively compressing SD1 can reduce the size of the head of the optical imaging system 10, reduce the width of the optical imaging system 10 perpendicular to the optical axis, and with the reduction of CT12, compress the overall volume to a greater extent, improve compactness, achieve miniaturization, and reduce the risk of ghost images; at the same time, it also reduces the difficulty of structural arrangement and improves the assembly yield. When CT12>0.3, under the condition of meeting the FOV requirement, due to the rapid reduction of the deflection angle of the incident second lens L2, the thickness of the first lens L1 and SD1 are difficult to control within a reasonable range, and if SD1 is too large, the possibility of structural arrangement will be lost.

[0117] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0118] 2.0%<|DIS / FNO|<8.0%;

[0119] Among them, DIS is the maximum value of the optical distortion of the optical imaging system 10, and FNO is the aperture number of the optical imaging system 10, that is, |DIS / FNO| can be any value in the range of (2.0%, 8.0%), for example, 6.83%, 3.64%, 7.89%, 7.05%, 5.89%, 2.12%, 6.98%, etc.

[0120] The setting of the central aperture makes the structure of the optical imaging system 10 symmetrical to a certain extent, so that the optical distortion is better controlled. FNO is positively correlated with the diffraction limit and the Airy disk. If the above formula is satisfied, the system can obtain a large aperture effect and a field of view of more than 120°. In this case, the overall structure of the system is reasonably controlled so that the optical distortion is less than 15% and the minimum DIS is 5%. Thus, the distortion at the edge of wide-angle shooting can be reduced; even more, FNO < 1.9, the diffraction limit of the system is further improved, and with a good lens surface shape and refractive power configuration, a higher optical transfer function value and better image quality can be obtained. Thus, the distortion at the edge of wide-angle shooting can be reduced and better image quality can be obtained.

[0121] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0122] CT45 / ET5<0.30;

[0123] Among them, CT45 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 ET5 is the thickness of the edge of the optical effective area of ​​the fifth lens L5, that is, CT45 / ET5 can be any value less than 0.30, for example, 0.22, 0.08, 0.05, 0.27, 0.26, 0.19, 0.20, etc. When CT45>0.15, the fifth lens L5 can provide edge light with a suitable deflection angle, and the surface shape of its image side surface S8 will change complexly, introducing more aberrations. When the above formula is satisfied, the fourth lens L4 and the fifth lens L5 form a certain matching shape, which can reduce the axial size, providing convenience for improving the compactness of the system and compressing the optical length. CT45<0.11, the fourth lens L4 and the fifth lens L5 are matched in a C shape, the smaller the distance between the two lenses, the closer they are to a cemented lens, the fifth lens L5 has negative refractive power, the fourth lens L4 has positive or negative refractive power, the combination of high and low refractive index 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. A good refractive power setting can make the system have a good resolution improvement.

[0124] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0125] 0.2<SAG62 / R61<0.5;

[0126] Among them, SAG62 is the maximum sag height of the image side surface S12 of the sixth lens L6, and R61 is the radius of curvature of the object side surface S11 of the sixth lens L6 at the optical axis, that is, SAG62 / R61 can be any value in the range of (0.2, 0.5), for example, 0.44, 0.42, 0.30, 0.22, 0.32, 0.31, 0.46, etc. The "sag height" is the distance from the projection of the edge of the effective area of ​​the image side surface of the lens on the optical axis to the intersection of the image side surface of the lens and the optical axis.

[0127] Satisfying the above formula, the wavy lens structure of the sixth lens L6 provides a good refractive power distribution perpendicular to the optical axis direction, provides a good transition for the edge field light to be incident on the image plane S15, reduces the image plane incident angle, is beneficial to improve the relative brightness on the image plane S15, and reduces the tolerance sensitivity of the lens.

[0128] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0129] 20.0<|R41 / ET4|<71.5;

[0130] Wherein, R41 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis, and ET4 is the thickness of the edge of the optically effective area of ​​the fourth lens L4, that is, |R41 / ET4| can be any value in the range of (20.0, 71.5), for example, 27.33, 11.41, 20.56, 33.92, 28.43, 13.74, 71.20, etc.

[0131] Satisfying the above formula, the surface shape and thickness of the fourth lens L4 change, so that the light shrunk by the first lens L1 and the second lens L2 gradually diffuses at the fourth lens L4, avoiding excessive deflection of the light and causing increased sensitivity. Among them, in some embodiments, ET4<0.27 can make the fourth lens L4 meniscus-shaped, the refractive power changes, the amount of each primary aberration introduced on the object side is small, and the introduction of the image side aberration can cooperate with other lenses to correct the overall aberration; reasonable refractive power configuration can improve the image quality of the system. If ET4>0.3, the surface shape of the object side S7 of the fourth lens L4 tends to be flat, and the ability to deflect edge light decreases, making it difficult to improve the edge field of view performance; if ET<0.1, it makes it difficult to balance the thickness-to-edge ratio of the fourth lens L4, which easily increases the difficulty of manufacturing.

[0132] In some embodiments, the optical imaging system satisfies the following condition:

[0133] 0.35<(CT1+CT2) / SD1<0.5;

[0134] Wherein, CT1 is the thickness of the first lens L1 on the optical axis, CT2 is the thickness of the second lens L2 on the optical axis, and SD1 is the vertical distance between the edge of the effective area of ​​the object-side surface S1 of the first lens L1 and the optical axis, that is, (CT1+CT2) / SD1 can be any value in the range of (0.25, 0.5), for example, 0.46, 0.44, 0.39, 0.61, 0.44, 0.38, 0.40, etc.

[0135] If the above formula is satisfied, the reduction of CT1 and CT2 can reduce SD1, thereby reducing the head size of the optical imaging system 10, reducing the optical length of the optical imaging system 10, and facilitating molding and manufacturing. In some embodiments, 0.2<CT≤0.55. If CT1>0.55, SD1>1.9 can be achieved. At this time, the effective diameter of the first lens L1 is equivalent to or larger than the effective diameter of the sixth lens L6, and has a large difference from the effective diameters of the second lens L2 and the third lens L3. This difference increases the difficulty of arranging the lens support and the lens barrel structure, and the light incident port diameter and the lens module volume are large, which is not conducive to miniaturization development; if CT1<0.2, the edge curvature of the first lens L1 increases, and the edge thickness is further increased, making it difficult to maintain the lens with a suitable thickness ratio.

[0136] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0137] 1.2≤(CT3+CT4+CT5) / BF<2.4;

[0138] 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 image side surface S12 and the image surface S15 of the sixth lens L6 in the direction parallel to the optical axis.

[0139] Among them, BF≥0.55, if BF<0.55, it is difficult to provide a suitable match and adjustment gap between the lens and the photosensitive chip; CT3<0.52, CT4<0.6, the third lens L3, the fourth lens L4 and the fifth lens L5 can maintain a suitable middle thickness, avoid the increase of surface complexity, and facilitate the production and injection molding of molds; if CT3>0.55, CT4>0.6, due to the increase in size, it is difficult to maintain a small TTL, which is not conducive to maintaining the thin and light characteristics of the system. (CT3+CT4+CT5) / BF can be any value in the range of [1.2,2.4), such as 1.93, 2.13, 2.16, 1.2, 1.82, 2.33, 1.97, etc.

[0140] Satisfying the above formula can ensure that the optical imaging system 10 and the photosensitive chip 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 form the symmetry of the structure, and reduce optical distortion.

[0141] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0142] 0.85<TTL / (ImgH*2)<1.1

[0143] Wherein, TTL is the distance from the object-side surface S1 of the first lens L1 to the imaging plane on the optical axis, ImgH is half of the diagonal length of the effective imaging area of ​​the optical imaging system on the imaging plane, that is, TTL / (ImgH*2) can be any value in the range of (0.85, 1.1), for example, 0.89, 1.00, 0.97, 1.02, 0.96, 1.03, 0.95, etc.

[0144] When the above formula is satisfied, the total optical length can be compressed, making the structure of the optical imaging system 10 more compact, while maintaining a reasonable distribution of lens thickness, which is helpful for molding and assembly; ImgH can be appropriately increased to obtain support for chips with large image plane sizes. When 0.8<TTL / (ImgH*2)<1.0 is satisfied, the optical imaging system 10 has a good thickness and volume. At this time, the conflict between the performance of the optical imaging system 10 and TTL is avoided, which is beneficial to improving the performance of the optical system while maintaining the light and thin characteristics; ImgH can be appropriately increased to obtain support for chips with large image plane sizes. If TTL / (ImgH*2)<0.75, TTL and materials limit the improvement of performance, and adding high refractive index materials will greatly increase the production cost; if TTL / (ImgH*2)>1.4, due to the high TTL, it is not conducive to the optical imaging system 10 to achieve lightness and thinness.

[0145] In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspherical. 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, and the sixth lens L6 in the optical imaging system 10 are all aspherical.

[0146] The shape of an aspheric surface is determined by the following formula:

[0147]

[0148] Among them, Z is the longitudinal distance from any point on the aspheric surface to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, and Ai is the correction coefficient of the i-th order aspheric surface.

[0149] 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.

[0150] First embodiment

[0151] 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power.

[0152] 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 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, and both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0153] 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 convex 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 concave 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0154] The aperture stop STO is provided between the second lens L2 and the third lens L3.

[0155] In the first embodiment, the field of view FOV of the optical imaging system is 134.0°, the effective focal length f is 1.08 mm, FOV / f=124.07° / mm, SD1 / CT12=16.38, |DIS / FNO|=6.83%, CT45 / ET5=0.22, SAG62 / R61=0.44, |R41 / ET4|=27.33, (CT1+CT2) / SD1=0.46, (CT3+CT4+CT5) / BF=1.93, TTL / (ImgH*2)=0.89.

[0156] The reference wavelength in the first embodiment is 587 nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table.

[0157] Table 1

[0158]

[0159]

[0160] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0161] Table 2

[0162]

[0163]

[0164] Second embodiment

[0165] 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, and a sixth lens L6 with positive refractive power.

[0166] 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 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 both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0167] 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 convex 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 concave 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0168] The aperture stop STO is disposed on the object-side surface S5 of the third lens L3.

[0169] In the second embodiment, the FOV of the optical imaging system is 118.27°, the effective focal length f is 1.29 mm, FOV / f=91.68° / mm, SD1 / CT12=5.59, |DIS / FNO|=3.64%, CT45 / ET5=0.08, SAG62 / R61=0.42, |R41 / ET4|=11.41, (CT1+CT2) / SD1=0.44, (CT3+CT4+CT5) / BF=2.13, TTL / (ImgH*2)=1.00.

[0170] The reference wavelength in the second embodiment is 587 nm, and the optical imaging system 10 in the second embodiment satisfies the conditions in the following table.

[0171] Table 3

[0172]

[0173] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0174] Table 4

[0175]

[0176]

[0177] Third embodiment

[0178] 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 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, and a sixth lens L6 with positive refractive power.

[0179] 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 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 both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0180] 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 convex 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0181] The aperture stop STO is provided between the second lens L2 and the third lens L3.

[0182] In the third embodiment, the FOV of the optical imaging system is 126.2°, the effective focal length f is 1.07 mm, FOV / f=117.94° / mm, SD1 / CT12=6.28, |DIS / FNO|=7.89%, CT45 / ET5=0.05, SAG62 / R61=0.30, |R41 / ET4|=20.56, (CT1+CT2) / SD1=0.39, (CT3+CT4+CT5) / BF=2.16, TTL / (ImgH*2)=0.97.

[0183] 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.

[0184] Table 5

[0185]

[0186]

[0187] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0188] Table 6

[0189]

[0190] Fourth embodiment

[0191] 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, 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 negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power.

[0192] 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 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, and both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0193] 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 convex 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 concave 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0194] The aperture stop STO is disposed on the object-side surface S5 of the third lens L3.

[0195] In the fourth embodiment, the FOV of the optical imaging system is 117.43°, the effective focal length f is 1.2 mm, FOV / f=87.86° / mm, SD1 / CT12=8.19, |DIS / FNO|=7.05%, CT45 / ET5=0.27, SAG62 / R61=0.22, |R41 / ET4|=33.92, (CT1+CT2) / SD1=0.61, (CT3+CT4+CT5) / BF=1.2, TTL / (ImgH*2)=1.02.

[0196] 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.

[0197] Table 7

[0198]

[0199]

[0200] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0201] Table 8

[0202]

[0203]

[0204] Fifth embodiment

[0205] 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 positive refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power.

[0206] 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 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, and both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0207] 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 convex 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 concave 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.

[0208] The aperture stop STO is disposed on the object-side surface S5 of the third lens L3.

[0209] In the fifth embodiment, the FOV of the optical imaging system is 130°, the effective focal length f is 1.22 mm, FOV / f=106.56° / mm, SD1 / CT12=4.8, |DIS / FNO|=5.89%, CT45 / ET5=0.26, SAG62 / R61=0.32, |R41 / ET4|=28.43, (CT1+CT2) / SD1=0.44, (CT3+CT4+CT5) / BF=1.82, TTL / (ImgH*2)=0.96.

[0210] 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.

[0211] Table 9

[0212]

[0213] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0214] Table 10

[0215]

[0216]

[0217] Sixth embodiment

[0218] Please refer to Fig.11 and Fig.12 The optical imaging system 10 of the sixth 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, and a sixth lens L6 with positive refractive power.

[0219] 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 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 both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 is concave at the optical axis, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0220] 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 convex 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 concave 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0221] The aperture stop STO is provided between the second lens L2 and the third lens L3.

[0222] In the sixth embodiment, the FOV of the optical imaging system is 126.58°, the effective focal length f is 1.05 mm, FOV / f=120.55° / mm, SD1 / CT12=5.18, |DIS / FNO|=2.12%, CT45 / ET5=0.19, SAG62 / R61=0.31, |R41 / ET4|=13.74, (CT1+CT2) / SD1=0.38, (CT3+CT4+CT5) / BF=2.33, TTL / (ImgH*2)=1.03.

[0223] The reference wavelength in the sixth embodiment is 587 nm, and the optical imaging system 10 in the sixth embodiment satisfies the conditions in the following table.

[0224] Table 11

[0225]

[0226] It should be noted that EFL is the effective 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 imaging surface on the optical axis.

[0227] Table 12

[0228]

[0229] Seventh embodiment

[0230] Please refer to Fig.13 and Fig.14 The optical imaging system 10 of the seventh 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 negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power.

[0231] 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 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, and both the object-side surface S9 and the image-side surface S10 are aspherical surfaces; 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, and both the object-side surface S11 and the image-side surface S12 are aspherical surfaces, and at least one of the object-side surface S11 and the image-side surface S12 is provided with at least one inflection point.

[0232] 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 convex 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 concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0233] The aperture stop STO is provided between the second lens L2 and the third lens L3.

[0234] In the seventh embodiment, the field of view FOV of the optical imaging system is 134.4°, the effective focal length f is 1.05 mm, FOV / f=128° / mm, SD1 / CT12=8.67, |DIS / FNO|=6.98%, CT45 / ET5=0.20, SAG62 / R61=0.46, |R41 / ET4|=71.20, (CT1+CT2) / SD1=0.40, (CT3+CT4+CT5) / BF=1.97, TTL / (ImgH*2)=0.95.

[0235] The reference wavelength in the seventh embodiment is 587 nm, and the optical imaging system 10 in the seventh embodiment satisfies the conditions in the following table.

[0236] Table 13

[0237]

[0238]

[0239] It should be noted that EFL is the effective 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 total length of the optical imaging system 10.

[0240] Table 14

[0241]

[0242]

[0243] Please refer to Fig.15 The imaging module 100 of the embodiment of the present invention includes an optical imaging system 10 and a photosensitive element 20 , and the photosensitive element 20 is arranged on the image side of the optical imaging system 10 .

[0244] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0245] The imaging module 100 of the embodiment of the present invention can enhance the optical imaging system 10's ability to capture low-frequency details, effectively reduce edge field distortion, and increase the aperture number through the above-mentioned reasonable configuration of the refractive power, while achieving a wide viewing angle and high imaging quality, and reducing the size of the optical imaging system 10, thereby achieving miniaturization of the optical imaging system 10.

[0246] Please refer to Fig.16 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 .

[0247] 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.

[0248] The optical imaging system 10 in the electronic device 1000 of the above embodiment can improve the ability to capture low-frequency details, effectively reduce edge field distortion, increase the aperture number, and achieve a wide viewing angle and high imaging quality through a reasonable configuration of refractive power.

[0249] 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.

[0250] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the present invention. 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 solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An optical imaging system, characterized in that: From the object side to the image side, it is composed of the following lenses: a first lens element having negative refractive power; a second lens having refractive power; a third lens element having positive refractive power; a fourth lens having a refractive power; a fifth lens element having negative refractive power; and a sixth lens element having positive refractive power; The optical imaging system satisfies the following conditional formula: 106.56° / mm≤FOV / f≤128.0° / mm, 0.35<(CT1+CT2) / SD1<0.5; Among them, FOV is the maximum field of view of the optical imaging system, f is the effective focal length of the optical imaging system, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and SD1 is the vertical distance from the edge of the optically effective area on the object side of the first lens to the optical axis.

2. The optical imaging system according to claim 1, wherein: The object side surface of the first lens is concave at the optical axis, and the image side surface thereof is concave at the optical axis; The object side surface of the second lens is convex at the optical axis, and the image side surface thereof is concave at the optical axis; The object side surface of the third lens is convex at the optical axis, and the image side surface thereof is convex at the optical axis; The object side surface of the fourth lens is concave at the optical axis, and the image side surface thereof is convex at the optical axis; The object side surface of the fifth lens is concave on the circumference, the image side surface is concave on the circumference, and both the object side surface and the image side surface are aspherical surfaces; The object side surface of the sixth lens is convex at the optical axis, the image side surface is concave at the optical axis, the object side surface and the image side surface are both aspherical surfaces, and at least one of the object side surface and the image side surface is provided with at least one inflection point.

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

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 4.5<SD1 / CT12<16.5; Wherein, SD1 is the vertical distance from the edge of the optically effective area of ​​the object side surface of the first lens to the optical axis, and CT12 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 2.0%<|DIS / FNO|<8.0%; Wherein, DIS is the maximum value of the optical distortion of the optical imaging system, and FNO is the aperture number of the optical imaging system.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: CT45 / ET5<0.30; Wherein, CT45 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 ET5 is the thickness of the edge of the optical effective area of ​​the fifth lens.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0.2<SAG62 / R61<0.5; Among them, SAG62 is the maximum sag height of the image side surface of the sixth lens, and R61 is the curvature radius of the object side surface of the sixth lens at the optical axis.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 20.0<|R41 / ET4|<71.5; Wherein, R41 is the curvature radius of the object side of the fourth lens at the optical axis, and ET4 is the thickness of the edge of the optically effective area of ​​the fourth lens.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.2≤(CT3+CT4+CT5) / BF<2.4; 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 image side surface of the sixth lens and the image plane in the direction parallel to the optical axis.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: Wherein, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half of the diagonal length of the effective imaging area of ​​the optical imaging system on the imaging plane.

11. An imaging module, comprising: The optical imaging system according to any one of claims 1 to 10; and A photosensitive element is arranged on the image side of the optical imaging system.

12. An electronic device comprising: case; and The imaging module described in claim 11 is mounted on the housing.

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