Optical imaging system, imaging module and electronic device

Abstract

The present application proposes an optical imaging system, an imaging module and an electronic device. The optical imaging system includes: a first lens with positive refractive power; a second lens with refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power, wherein the object side and the image side of the fifth lens are both aspherical surfaces; the optical imaging system satisfies the following relationship: 1.2<|f3 / f|<4.2; wherein f3 is the effective focal length of the third lens, and f is the effective focal length of the optical imaging system. The above-mentioned optical imaging system can further shorten the total length of the optical imaging system and the head diameter of the lens to achieve the miniaturization of the lens, improve the screen-to-body ratio, and achieve the full-screen effect by reasonably configuring the refractive power and surface shape of each lens, while achieving the characteristics of large aperture and high pixel.

Description

Technical Field

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

[0002] In the past decade or so, the manufacturing technology of electronic products such as smartphones, tablets, and cameras has developed rapidly, their applications have become more and more popular, and they are showing a diversified development trend. Among them, electronic products such as smartphones and tablets equipped with lenses are also becoming more and more lightweight, portable, and miniaturized.

[0003] To a certain extent, the thickness of the lens determines the thickness of the entire electronic product, so reducing the thickness of the lens becomes the main way to make electronic products thinner and lighter. In the process of realizing this application, the inventor found that the prior art has the following problems: the front camera of most current electronic products has a large aperture, which will occupy part of the entire screen area, making the display screen area limited. Although there is a way to make the camera into a bangs form to increase the display screen area, it is still impossible to achieve a mobile phone equipped with a front camera and a full screen effect. Summary of the invention

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

[0005] The embodiment of the present application provides an optical imaging system, which includes, from the object side to the image side, the following:

[0006] A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis;

[0007] a second lens having refractive power;

[0008] A third lens element having negative refractive power;

[0009] a fourth lens having positive refractive power, wherein the object side surface of the fourth lens is concave at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis;

[0010] a fifth lens having negative refractive power, wherein the object side surface of the fifth lens is convex at the near optical axis, the image side surface of the fifth lens is concave at the near optical axis, and both the object side surface and the image side surface of the fifth lens are aspherical surfaces;

[0011] The optical imaging system satisfies the following relationship:

[0012] 1.2<|f3 / f|<4.2;

[0013] Wherein, f3 is the effective focal length of the third lens, and f is the effective focal length of the optical imaging system.

[0014] The above optical imaging system can further shorten the total length of the optical imaging system and the head diameter of the lens to achieve the miniaturization of the lens by reasonably configuring the refractive force and surface shape of each lens, based on the realization of large aperture and high pixel characteristics, thereby increasing the screen-to-body ratio and promoting and achieving the full-screen effect. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving image quality and reducing assembly sensitivity.

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

[0016] |sag51m-sag51s| / (sd51m-sd51s)>0.2;

[0017] Among them, the object side surface of the fifth lens has a first intersection with the optical axis, the tangent plane of each point within the effective diameter of the object side surface of the fifth lens intersects with the plane perpendicular to the optical axis to form an acute angle, sag51m is the distance from the point with the largest acute angle to the first intersection in the direction of the optical axis; there is a second intersection at one quarter of the first intersection from the maximum effective semi-aperture from the first intersection to the object side surface of the fifth lens, sag51s is the distance from the first intersection to the second intersection in the direction of the optical axis; sd51m is the semi-aperture at the point with the largest acute angle; sd51s is the semi-aperture at the second intersection.

[0018] By controlling the above ratio within a reasonable range, it can be ensured that the surface shape of the object side of the fifth lens extends from the center of the lens to the object side, which is conducive to reducing the difficulty of lens molding of the fifth lens. In addition, it can effectively avoid the generation of ghost images on the imaging surface due to internal reflection light, reduce the possibility of stray light, and thus greatly improve the imaging quality. When the value is less than 0.2, the risk of ghost images will increase and the image quality will be affected.

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

[0020] 1 <et3 / (et23+et34)<4.2;

[0021] Among them, et3 is the thickness of the maximum effective semi-aperture of the third lens in the direction of the optical axis, et23 is the distance from the maximum effective diameter of the image side surface of the second lens to the maximum effective diameter of the object side surface of the third lens in the direction of the optical axis, and et34 is the distance from the maximum effective diameter of the image side surface of the third lens to the maximum effective diameter of the object side surface of the fourth lens in the direction of the optical axis.

[0022] By properly controlling the above ratio, it is beneficial to reasonably compress the thickness and air gap of the three middle lenses and control the relative positions of the three middle lenses, thereby effectively shortening the total length of the optical imaging system and realizing the miniaturization of the optical imaging system. When et3 / (et23+et34)≥4.2, the edge thickness of the third lens is too large and too close to the front and rear lenses, which will increase the difficulty of lens assembly and the possibility of collision and damage between lenses; when et3 / (et23+et34)≤1, it is not conducive to shortening the total length of the optical imaging system.

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

[0024] (sd21+sd22) / (sd11+sd12)≥1.05;

[0025] Among them, sd21 is the maximum effective semi-aperture of the object side of the second lens, sd22 is the maximum effective semi-aperture of the image side of the second lens, sd11 is the maximum effective semi-aperture of the object side of the first lens, and sd12 is the maximum effective semi-aperture of the image side of the first lens.

[0026] By rationally configuring the above ratios, it is beneficial to achieve the small head characteristic on the basis of ensuring a large field of view, a large image surface and a small structure. When (sd21+sd22) / (sd11+sd12)<1.05, the aperture of the first lens is close to or larger than the second lens, which is not conducive to the optical imaging system to obtain the small head characteristic.

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

[0028] 3.5 <f5 / sag51<20.5;

[0029] Wherein, f5 is the effective focal length of the fifth lens; sag51 is the distance from the intersection of the object side surface of the fifth lens on the optical axis to the maximum effective semi-aperture of the object side surface of the fifth lens in the direction of the optical axis.

[0030] In this way, the fifth lens has at least one inflection point, which is beneficial to correcting the distortion and field curvature produced by the front lens group, so that the refractive power configuration close to the imaging surface is more uniform; in addition, when the above formula is satisfied, the refractive power and sagittal height of the lens in the vertical direction can be reasonably controlled, which can avoid the lens being too thin or too thick, reduce the incident angle of light on the imaging surface, reduce the overall optical sensitivity of the optical imaging system, and obtain higher stability.

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

[0032] 1.2 <sag4| / et4<3.2;

[0033] Among them, sag42 is the distance from the intersection of the image side surface of the fourth lens on the optical axis to the maximum effective radius position of the image side surface of the fourth lens in the optical axis direction, and et4 is the thickness of the fourth lens at the maximum effective semi-aperture in the optical axis direction.

[0034] In this way, by controlling the above ratio within a reasonable range, it is beneficial to balance the spherical aberration generated by the front lens group, improve the overall resolution of the optical imaging system, and reduce the optical sensitivity of the fourth lens. In addition, the change in the sagittal height of the image side of the fourth lens makes the fourth lens U-shaped, maintaining a reasonable difference in the middle thickness and edge thickness to provide support for light to be incident from the front lens group to the image plane at a smaller angle.

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

[0036] 1.7 <TTL / etal<2.7;

[0037] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and etal is the sum of the thicknesses of the maximum effective semi-apertures of the first lens to the fifth lens in the optical axis direction.

[0038] In this way, controlling the above ratio within a reasonable range is conducive to effectively shortening the total length of the optical imaging system, thereby compressing the overall length of the optical imaging system and making the lens structure more compact; by reasonably configuring the lens size and refractive power, the optical imaging system can be miniaturized and made thinner while meeting high pixel and high imaging quality.

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

[0040] Imgh / sd51>4.2;

[0041] Wherein, Imgh is half of the image height corresponding to the maximum field angle of the optical imaging system, and sd51 is the maximum effective half-aperture of the object side of the fifth lens.

[0042] Thus, by controlling the above ratio within a reasonable range, a large imaging surface can be obtained to achieve high-pixel imaging, and the optical imaging system can be made more competitive with small head characteristics. When Imgh / sd51≤4.2, it cannot match chips with higher pixels, and high-definition imaging cannot be achieved, which reduces the user experience.

[0043] In some embodiments, the optical imaging system satisfies the following relationship:

[0044] 1.9 <sd51 / atl<4

[0045] Wherein, sd51 is the maximum effective semi-aperture of the object side of the fifth lens, and atl is the sum of the distances of the air gaps between two adjacent lenses from the first lens to the fifth lens on the optical axis.

[0046] Thus, by controlling the above ratio within a reasonable range, it is beneficial to realize the miniaturization of the optical imaging system. When sd51 / atl≥4, the aperture of the fifth lens is too large, which increases the material cost and reduces the stability of the lens on the one hand, and makes the edge light deflection angle on the object side of the fifth lens too large on the other hand, reducing the resolution; when sd51 / atl≤2, the sum of the thickness of the air gap is too large, which is not conducive to reducing the total optical length and realizing the miniaturization of the entire optical imaging system.

[0047] In some embodiments, the optical imaging system satisfies the following relationship:

[0048] BF / et52>1;

[0049] Among them, BF is the minimum distance from the image side surface of the fifth lens to the imaging surface of the optical imaging system in the direction of the optical axis, and et52 is the distance on the optical axis between the air gap between the maximum effective semi-aperture of the image side surface of the fifth lens and the filter.

[0050] In this way, by controlling the above ratio within a reasonable range, the back focus can be kept at about 0.8mm, which can ensure good matching with the photosensitive chip. The reasonable control of the distance from the image side edge of the fifth lens to the filter is also conducive to the more reasonable convergence of light to the imaging surface, which helps to control aberrations and improve resolution and image quality. When BFL / et52≤1, the two parameters are not configured reasonably, which can easily lead to excessive light deflection angles, poor light convergence effects, damage to aberration correction, and affect image quality.

[0051] The embodiment of the present application further proposes an imaging module, comprising:

[0052] Optical imaging systems; and

[0053] A photosensitive element is arranged on the image side of the optical imaging system.

[0054] The optical imaging system in the imaging module of the embodiment of the present application can further shorten the total length of the optical imaging system and the head diameter of the lens to achieve the miniaturization of the lens by reasonably configuring the refractive force and surface shape of each lens, while achieving the characteristics of large aperture and high pixel, thereby increasing the screen-to-body ratio and promoting and achieving the full-screen effect. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

[0055] An embodiment of the present application provides an electronic device, comprising: a housing and an imaging module according to the above embodiment, wherein the imaging module is mounted on the housing.

[0056] The electronic device of the embodiment of the present application includes an imaging module. The optical imaging system in the imaging module can further shorten the total length of the optical imaging system and the head diameter of the lens to achieve the miniaturization of the lens by reasonably configuring the refractive force and surface shape of each lens, while achieving the characteristics of large aperture and high pixel, thereby increasing the screen-to-body ratio and promoting and achieving the full-screen effect. In addition, the aberration generated by the third lens can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application may become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 It is a schematic diagram of the structure of the fifth lens in the optical imaging system of the first embodiment of the present application.

[0059] Figure 2 1 is a schematic diagram of the structure of the first lens to the fifth lens in the optical imaging system of the second embodiment of the present application.

[0060] Figure 3 It is a schematic structural diagram of the optical imaging system of the first embodiment of the present application.

[0061] Figure 4 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the first embodiment of the present application.

[0062] Figure 5 It is a schematic structural diagram of the optical imaging system of the second embodiment of the present application.

[0063] Figure 6 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the second embodiment of the present application.

[0064] Figure 7 It is a schematic structural diagram of an optical imaging system according to the third embodiment of the present application.

[0065] Figure 8 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the third embodiment of the present application.

[0066] Fig. 9 It is a schematic structural diagram of the optical imaging system of the fourth embodiment of the present application.

[0067] Fig.10 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the fourth embodiment of the present application.

[0068] Fig.11 It is a schematic structural diagram of the optical imaging system of the fifth embodiment of the present application.

[0069] Fig.12 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the fifth embodiment of the present application.

[0070] Fig.13 It is a schematic structural diagram of the optical imaging system of the sixth embodiment of the present application.

[0071] Fig.14 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the sixth embodiment of the present application.

[0072] Fig.15 It is a structural schematic diagram of the optical imaging system of the seventh embodiment of the present application.

[0073] Fig.16 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the seventh embodiment of the present application.

[0074] Fig.17 It is a schematic structural diagram of the optical imaging system of the eighth embodiment of the present application.

[0075] Fig.18 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the eighth embodiment of the present application.

[0076] Fig.19 It is a schematic structural diagram of the optical imaging system of the ninth embodiment of the present application.

[0077] Fig. 20 It is a graph of spherical aberration, astigmatism and distortion of the optical imaging system in the ninth embodiment of the present application.

[0078] Fig.21 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0079] Main component symbols

[0080] Electronic device 1000

[0081] Image acquisition module 100

[0082] Optical imaging system 10

[0083] First lens L1

[0084] Second lens L2

[0085] The third lens L3

[0086] The fourth lens L4

[0087] Fifth lens L5

[0088] IR filter L6

[0089] Aperture STO

[0090] Object side S1, S4, S6, S8, S10, S12

[0091] Like the side S2, S5, S7, S9, S11, S13

[0092] Imaging surface S14

[0093] Photosensitive element 20

[0094] Housing 200 DETAILED DESCRIPTION

[0095] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application 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 application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0096] In the description of the present application, 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 application 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 a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, 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 application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0097] In the description of this application, 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 this application can be understood according to specific circumstances.

[0098] In the present application, 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.

[0099] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, 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 application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0100] See also Figures 1 to 3 The optical imaging system 10 of the embodiment of the present application 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 negative refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power.

[0101] 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 S4 and an image-side surface S5; the third lens L3 has an object-side surface S6 and an image-side surface S7, the fourth lens L4 has an object-side surface S8 and an image-side surface S9, the object-side surface S8 of the fourth lens L4 is convex at the near optical axis, and the image-side surface S9 of the fourth lens L4 is convex at the near optical axis; the fifth lens L5 has an object-side surface S10 and an image-side surface S11.

[0102] The optical imaging system 10 satisfies the following relationship:

[0103] 1.2<|f3 / f|<4.2;

[0104] Wherein, f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical imaging system 10.

[0105] The above optical imaging system 10 can further shorten the total length of the optical imaging system 10 and the head diameter of the lens to achieve the miniaturization of the lens by reasonably configuring the refractive force and surface shape of each lens, while achieving the characteristics of large aperture and high pixel, thereby increasing the screen-to-body ratio and promoting and achieving the full-screen effect. In addition, the aberration generated by the third lens L3 can be compressed as much as possible, thereby improving the image quality and reducing the assembly sensitivity.

[0106] 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 fifth lens L5, between any two lenses, or on the surface of any lens. The stop STO is used to reduce stray light and help improve image quality. Preferably, the stop STO is disposed on the object side S2 of the first lens L1.

[0107] In some embodiments, the optical imaging system 10 further includes an infrared filter L6, and the infrared filter L6 has an object-side surface S12 and an image-side surface S13. The infrared filter L6 is disposed on the image side of the fifth lens L6, and the infrared filter L6 is used to filter the imaging light, specifically to isolate the infrared light, to prevent the infrared light from being received by the photosensitive element, thereby preventing the infrared light from affecting the color and clarity of the normal image, thereby improving the imaging quality of the imaging lens 10. Preferably, the infrared filter L6 is an infrared cutoff filter.

[0108] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0109] |sag51m-sag51s| / (sd51m-sd51s)>0.2;

[0110] The object side surface S10 of the fifth lens L5 has a first intersection with the optical axis, and the tangent planes at each point within the effective diameter of the object side surface S10 of the fifth lens L5 intersect with the plane perpendicular to the optical axis to form an acute angle. Figure 1, the object side surface S10 of the fifth lens L5 has a first intersection A with the optical axis. The object side surface S10 of the fifth lens L5 is a curved surface. Theoretically, it has countless non-parallel tangent planes. The tangent planes L at each point within the effective diameter of the object side surface S10 of the fifth lens L5 intersect with the plane perpendicular to the optical axis to form an acute angle. The point with the largest acute angle is B. sag51m is the distance from the point B with the largest acute angle to the first intersection A in the direction of the optical axis. There is a second intersection C at one quarter of the first intersection from the first intersection A to the maximum effective semi-aperture of the object side surface S10 of the fifth lens L5. sag51s is the distance from the first intersection A to the second intersection C in the direction of the optical axis. sd51m is the semi-aperture at the point B with the largest acute angle. sd51s is the semi-aperture at the second intersection C.

[0111] By controlling the above ratio within a reasonable range, it can be ensured that the surface shape of the object side surface S10 of the fifth lens L5 extends from the lens center to the object side surface, which is conducive to reducing the difficulty of lens molding of the fifth lens L5. In addition, it can effectively avoid the generation of ghost images on the imaging surface S14 due to internal reflection light, reduce the possibility of stray light, and thus greatly improve the image quality. When the value is less than 0.2, the risk of ghost images will increase and the image quality will be affected.

[0112] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0113] 1 <et3 / (et23+et34)<4.2;

[0114] in, Figure 2 As shown in , et1 is the maximum effective half-diameter thickness of the first lens L1 in the optical axis direction, et2 is the maximum effective half-diameter thickness of the second lens L2 in the optical axis direction, et3 is the maximum effective half-diameter thickness of the third lens L3 in the optical axis direction, et4 is the maximum effective half-diameter thickness of the fourth lens L4 in the optical axis direction, et5 is the maximum effective half-diameter thickness of the fifth lens L5 in the optical axis direction, and et23 is the distance from the maximum effective diameter of the image side surface S5 of the second lens L2 to the object side surface S6 of the third lens L3 et34 is the distance between the maximum effective diameter of the image side S7 of the third lens L3 and the maximum effective diameter of the object side S8 of the fourth lens L4 in the direction of the optical axis, et52 is the distance on the optical axis between the maximum effective semi-aperture of the image side S11 of the fifth lens L5 and the air gap between the filter L6, and etal is the sum of the thickness of the maximum effective semi-aperture of the first lens L1 to the fifth lens L5 in the direction of the optical axis, that is, the sum of et1, et2, et3, et4 and et5. The lens includes an effective diameter and a non-effective diameter. Light incident from the outside can pass through the effective diameter of the lens and finally reach the photosensitive element; the non-effective diameter is mainly used to support the inside of the lens barrel.

[0115] By properly controlling the above ratio, it is beneficial to reasonably compress the thickness and air gap of the three middle lenses and control the relative positions of the three middle lenses, thereby effectively shortening the total length of the optical imaging system 10 and realizing the miniaturization of the optical imaging system 10. When et3 / (et23+et34)≥4.2, the edge thickness of the third lens L3 is too large and too close to the front and rear lenses, which will increase the difficulty of lens assembly and the possibility of collision and damage between lenses; when et3 / (et23+et34)≤1, it is not conducive to shortening the total length of the optical imaging system 10.

[0116] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0117] (sd21+sd22) / (sd11+sd12)≥1.05;

[0118] Wherein, sd21 is the maximum effective semi-aperture of the object-side surface S4 of the second lens L2, sd22 is the maximum effective semi-aperture of the image-side surface S5 of the second lens L2, sd11 is the maximum effective semi-aperture of the object-side surface S1 of the first lens L1, and sd12 is the maximum effective semi-aperture of the image-side surface S2 of the first lens L1.

[0119] By rationally configuring the above ratios, it is beneficial to achieve the small head characteristic on the basis of ensuring a large field of view, a large image surface and a small structure. When (sd21+sd22) / (sd11+sd12)<1.05, the aperture of the first lens L1 is close to or larger than the second lens L2, which is not conducive to the optical imaging system 10 to obtain the small head characteristic.

[0120] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0121] 3.5 <f5 / sag51<20.5;

[0122] Wherein, f5 is the effective focal length of the fifth lens L5; sag51 is the distance in the optical axis direction from the intersection of the object-side surface S10 of the fifth lens L5 on the optical axis to the maximum effective semi-aperture of the object-side surface S10 of the fifth lens L5.

[0123] In this way, the fifth lens L5 has at least one inflection point, which is beneficial to correcting the distortion and field curvature produced by the front lens group, so that the refractive power configuration near the imaging surface S14 is more uniform; in addition, when the above formula is satisfied, the refractive power and sagittal height of the lens in the vertical direction can be reasonably controlled, and the lens can be prevented from being too thin or too thick, thereby reducing the incident angle of light on the imaging surface S14, and reducing the overall optical sensitivity of the optical imaging system 10, so as to obtain higher stability.

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

[0125] 1.2 <sag4 / et4<3.2;

[0126] Wherein, sag42 is the distance from the intersection of the image side surface S9 of the fourth lens L4 on the optical axis to the maximum effective radius position of the image side surface S9 of the fourth lens L4 in the optical axis direction, and et4 is the maximum effective semi-aperture thickness of the fourth lens L4 in the optical axis direction.

[0127] In this way, by controlling the above ratio within a reasonable range, it is beneficial to balance the spherical aberration generated by the front lens group, improve the overall resolution of the optical imaging system 10, and reduce the optical sensitivity of the fourth lens L4. In addition, the change in the sagittal height of the image side surface S9 of the fourth lens L4 makes the fourth lens L4 U-shaped, maintaining a reasonable difference in the middle thickness and the edge thickness to provide support for the light from the front lens group to be incident on the image plane at a smaller angle.

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

[0129] 1.7 <TTL / etal<2.7;

[0130] Wherein, TTL is the distance between the object-side surface S1 of the first lens L1 and the imaging surface S14 of the optical imaging system 10 on the optical axis, and etal is the sum of the thicknesses of the maximum effective semi-apertures of the first lens L1 to the fifth lens L5 in the optical axis direction.

[0131] In this way, controlling the above ratio within a reasonable range is conducive to effectively shortening the total length of the optical imaging system 10, and then compressing the overall length of the optical imaging system 10, making the lens structure more compact; by reasonably configuring the lens size and refractive power, the optical imaging system 10 can be miniaturized and made thinner while meeting high pixel and high imaging quality.

[0132] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0133] Imgh / sd51>4.2;

[0134] Wherein, Imgh is half of the image height corresponding to the maximum field angle of the optical imaging system 10, and sd51 is the maximum effective half-aperture of the object-side surface S10 of the fifth lens L5.

[0135] Thus, by controlling the above ratio within a reasonable range, a large imaging surface S14 can be obtained to achieve high-pixel imaging, and the optical imaging system 10 can be made more competitive in terms of small head characteristics. When Imgh / sd51≤4.2, a chip with a higher pixel cannot be matched, high-definition imaging cannot be achieved, and the user experience is reduced.

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

[0137] 1.9 <sd51 / atl<4;

[0138] Wherein, sd51 is the maximum effective semi-aperture of the object-side surface S10 of the fifth lens L5, and atl is the sum of the distances of the air gaps between two adjacent lenses from the first lens L1 to the fifth lens L5 on the optical axis.

[0139] Thus, by controlling the above ratio within a reasonable range, it is beneficial to realize the miniaturization of the optical imaging system 10. When sd51 / atl≥4, the aperture of the fifth lens L5 is too large, which increases the material cost and reduces the stability of the lens on the one hand, and makes the edge light deflection angle on the object side S10 of the fifth lens L5 too large on the other hand, reducing the resolution; when sd51 / atl≤2, the sum of the thickness of the air gap is too large, which is not conducive to reducing the total optical length and realizing the miniaturization of the entire optical imaging system 10.

[0140] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0141] BF / et52>1;

[0142] Wherein, BF is the minimum distance between the image side surface S11 of the fifth lens L5 and the imaging surface S14 of the optical imaging system 10 in the optical axis direction, and et52 is the distance on the optical axis between the air gap between the maximum effective semi-aperture of the image side surface S11 of the fifth lens L5 and the filter L6.

[0143] In this way, by controlling the above ratio within a reasonable range, the back focus can be kept at about 0.8mm, which can ensure good matching with the photosensitive chip. The reasonable control of the distance from the edge of the image side S11 of the fifth lens L5 to the filter L6 is also conducive to the more reasonable convergence of light to the imaging surface S14, which helps to control aberrations and improve resolution and image quality. When BFL / et52≤1, the two parameters are not configured reasonably, which can easily lead to excessive light deflection angles, poor light convergence effects, damage to aberration correction, and affect image quality.

[0144] First embodiment

[0145] Please refer to Figure 3 The optical imaging system 10 of the first embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0146] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is convex at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0147] The object-side surface S1 of the first lens L1 is concave at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is concave at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is convex at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0148] In the first embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the first embodiment meets the conditions in the following table.

[0149] Table 1

[0150]

[0151] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system 10 on the optical axis.

[0152] Table 2

[0153] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -13.2044 0.5111 -1.0215 1.1705 4.0952 -22.9912 41.7697 -27.8568 0.0000 0.0000 2 -42.7009 0.0330 -0.2542 0.7585 -5.4087 16.6344 -25.3588 12.8844 0.0000 0.0000 4 -99.0000 -0.0890 -0.2623 0.2145 -2.1569 4.4323 -5.1165 0.0000 0.0000 0.0000 5 99.0000 -0.2502 0.4970 -4.1071 14.7893 -39.4709 59.3161 -35.1619 0.0000 0.0000 6 3.7053 -0.6914 2.0256 -15.6795 79.6490 -258.3099 487.3575 -475.1910 183.9394 0.0000 7 -58.1689 -0.5475 1.4358 -5.4528 15.4462 -29.1399 33.8126 -21.0037 5.0520 0.1962 8 21.4897 -0.1770 0.6883 -3.0042 8.8036 -16.6310 19.7904 -14.3338 5.8591 -1.0606 9 -4.2987 -0.5507 1.2400 -2.2223 2.4938 -1.4521 0.2961 0.0582 -0.0145 -0.0049 10 -45.1416 -0.2257 0.2165 -0.3243 0.3797 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.8847 -0.1325 0.0799 -0.0421 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0154] It should be noted that the surface of the lens of the optical imaging system 10 may be an aspherical surface. For these aspherical surfaces, the aspherical surface equation is:

[0155]

[0156] Wherein, Z represents the height parallel to the Z axis in the lens surface, r represents the radial distance from the vertex, c represents the curvature of the surface at the vertex, k represents the cone constant, and A4, A6, A8, A10, and A12 represent the aspheric coefficients of the corresponding orders of the 4th, 6th, 8th, 10th, and 12th orders, respectively. In the embodiment of the present application, the object side and image side of the first to fifth lenses are all aspheric surfaces, and the cone constant k and aspheric coefficients corresponding to the surface of each aspheric surface are shown in Table 2.

[0157] Figure 4 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0158] Second embodiment

[0159] Please refer to Figure 5 The optical imaging system 20 of the second embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0160] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is convex at the near optical axis, and the image side surface S5 of the second lens L2 is concave at the near optical axis; the object side surface S6 of the third lens L3 is convex at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0161] The object-side surface S1 of the first lens L1 is concave at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is convex at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is concave at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0162] In the second embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the second embodiment meets the conditions in the following table.

[0163] Table 3

[0164]

[0165]

[0166] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0167] Table 4

[0168] K A4 A6 A8 A10 A12 A14 A16 A18 A20 -15.0020 0.5011 -1.0641 1.0664 4.0364 -22.7357 42.2896 -29.6127 0.0000 0.0000 -29.2809 0.0348 -0.2835 0.7196 -5.5552 15.9679 -26.4050 21.2575 0.0000 0.0000 52.4502 -0.0293 -0.2972 0.2391 -1.9285 4.5116 -4.7556 0.0000 0.0000 0.0000 -99.0000 -0.2128 0.5314 -4.0278 14.9991 -39.2236 59.3085 -35.6657 0.0000 0.0000 -58.0801 -0.6765 2.0733 -15.6392 79.6393 -258.3356 487.4080 -475.0222 183.6179 0.0000 -2.4830 -0.5370 1.4170 -5.4490 15.4594 -29.1343 33.8017 -21.0278 5.0315 0.2118 19.4085 -0.1747 0.7409 -2.9862 8.7864 -16.6571 19.7715 -14.3398 5.8661 -1.0424 -4.3495 -0.5455 1.2321 -2.2282 2.4923 -1.4518 0.2966 0.0585 -0.0144 -0.0048 -39.8430 -0.2260 0.2163 -0.3243 0.3797 -0.2708 0.1149 -0.0284 0.0038 -0.0002 -4.5913 -0.1340 0.0801 -0.0422 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0169] Figure 6 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0170] Third embodiment

[0171] Please refer to Figure 7The optical imaging system 30 of the third embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0172] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is convex at the near optical axis, and the image side surface S5 of the second lens L2 is concave at the near optical axis; the object side surface S6 of the third lens L3 is convex at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0173] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 of the first lens L1 is convex near the circumference; the object-side surface S4 of the second lens L2 is convex near the circumference, and the image-side surface S5 of the second lens L2 is concave near the circumference; the object-side surface S6 of the third lens L3 is concave near the circumference, and the image-side surface S7 of the third lens L3 is convex near the circumference; the object-side surface S8 of the fourth lens L4 is concave near the circumference, and the image-side surface S9 of the fourth lens L4 is concave near the circumference; the object-side surface S10 of the fifth lens L5 is convex near the circumference, and the image-side surface S11 of the fifth lens L5 is concave near the circumference.

[0174] In the third embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the third embodiment meets the conditions in the following table.

[0175] Table 5

[0176]

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

[0178] Table 6

[0179] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -9.1855 0.5959 -1.0298 0.9925 4.0619 -22.2910 43.0686 -31.8955 0.0000 0.0000 2 -17.3798 0.0467 -0.2733 0.9739 -5.0787 15.8063 -30.2790 25.3633 0.0000 0.0000 4 -40.0244 -0.1419 -0.0030 0.1158 -1.7332 8.8867 -9.1018 0.0000 0.0000 0.0000 5 99.0000 -0.2442 0.5816 -3.7570 15.7566 -38.9208 57.3574 -35.5530 0.0000 0.0000 6 -99.0000 -0.6009 2.0040 -15.4598 79.7787 -258.7303 486.2993 -476.2981 184.2815 0.0000 7 7.0336 -0.5416 1.4526 -5.4858 15.4283 -29.1366 33.8222 -21.0031 5.0369 0.1685 8 4.8486 -0.1394 0.7002 -2.9779 8.8260 -16.6416 19.7641 -14.3522 5.8596 -1.0405 9 -5.2699 -0.5470 1.2546 -2.2248 2.4883 -1.4548 0.2955 0.0583 -0.0142 -0.0047 10 -33.3619 -0.2249 0.2171 -0.3243 0.3797 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.6491 -0.1394 0.0812 -0.0424 0.0171 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0180] Figure 8The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0181] Fourth embodiment

[0182] Please refer to Fig. 9 The optical imaging system 40 of the fourth embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0183] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is concave at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0184] The object-side surface S1 of the first lens L1 is convex at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is concave at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is concave at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0185] In the fourth embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the fourth embodiment meets the conditions in the following table.

[0186] Table 7

[0187]

[0188]

[0189] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0190] Table 8

[0191] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -11.5320 0.5570 -0.9956 1.1429 4.0988 -22.7728 42.1383 -28.8823 0.0000 0.0000 2 -19.5007 0.0509 -0.2370 0.7683 -5.3733 16.7998 -25.5481 8.4590 0.0000 0.0000 4 73.8717 -0.1203 -0.3132 0.1586 -2.0557 4.7081 -7.9522 0.0000 0.0000 0.0000 5 41.4003 -0.2647 0.4728 -4.0858 14.8218 -39.4467 59.3749 -34.7311 0.0000 0.0000 6 10.9773 -0.6913 2.0712 -15.7000 79.6084 -258.2984 487.4863 -475.0561 183.5828 0.0000 7 -99.0000 -0.5712 1.4304 -5.4676 15.4329 -29.1458 33.8124 -21.0016 5.0550 0.2001 8 11.4397 -0.1597 0.6283 -3.0246 8.8273 -16.6122 19.7944 -14.3372 5.8565 -1.0571 9 -5.2968 -0.6046 1.2540 -2.2064 2.5015 -1.4489 0.2973 0.0582 -0.0152 -0.0060 10 -19.5937 -0.2320 0.2173 -0.3240 0.3798 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.0155 -0.1361 0.0808 -0.0421 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0192] Fig.10 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0193] Fifth embodiment

[0194] Please refer to Fig.11 The optical imaging system 50 of the fifth embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0195] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is concave at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

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

[0197] In the fifth embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the fifth embodiment meets the conditions in the following table.

[0198] Table 9

[0199]

[0200] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0201] Table 10

[0202] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -10.7094 0.6162 -0.9541 1.1364 4.1799 -22.3164 42.8003 -31.5773 0.0000 0.0000 2 -4.5150 0.0723 -0.1632 1.1020 -5.4604 14.5951 -29.7071 25.4581 0.0000 0.0000 4 99.0000 -0.0881 -0.2412 -0.0324 -1.7242 7.6033 -18.9658 0.0000 0.0000 0.0000 5 27.3901 -0.2885 0.5256 -3.9994 14.8319 -39.6051 59.1477 -34.4510 0.0000 0.0000 6 38.7588 -0.7139 2.0447 -15.7086 79.6299 -258.2351 487.6041 -474.8592 183.8424 0.0000 7 39.2826 -0.5549 1.4223 -5.4718 15.4311 -29.1482 33.8089 -21.0049 5.0537 0.2019 8 12.1272 -0.1530 0.6807 -3.0043 8.8057 -16.6391 19.7778 -14.3422 5.8600 -1.0490 9 -4.1121 -0.5676 1.2415 -2.2178 2.4968 -1.4505 0.2968 0.0583 -0.0147 -0.0052 10 -61.9769 -0.2347 0.2180 -0.3238 0.3798 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.6816 -0.1333 0.0802 -0.0421 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0203] Fig.12The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0204] Sixth embodiment

[0205] Please refer to Fig.13 The optical imaging system 60 of the sixth embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0206] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is concave at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is convex at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0207] The object-side surface S1 of the first lens L1 is convex at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is concave at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is concave at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0208] In the sixth embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the sixth embodiment meets the conditions in the following table.

[0209] Table 11

[0210]

[0211] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0212] Table 12

[0213] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -8.7714 0.6236 -0.9652 1.1315 4.1815 -22.5115 42.3113 -30.1412 0.0000 0.0000 2 -7.5301 0.0760 -0.1449 0.9884 -5.4671 15.7338 -27.0735 17.9805 0.0000 0.0000 4 -99.0000 -0.1063 -0.1210 -0.0125 -2.5416 5.2909 -5.3712 0.0000 0.0000 0.0000 5 23.0208 -0.2457 0.5513 -4.1000 14.8176 -39.0744 59.9131 -35.9071 0.0000 0.0000 6 -1.8233 -0.6767 2.0508 -16.0820 79.5852 -257.2200 489.4774 -475.0340 172.6777 0.0000 7 0.0000 -0.5097 1.4119 -5.4267 15.4556 -29.1482 33.8034 -21.0034 5.0588 0.1867 8 8.0525 -0.2348 0.7058 -2.9876 8.8528 -16.6039 19.7854 -14.3549 5.8413 -1.0586 9 -4.6897 -0.5756 1.2440 -2.2157 2.4957 -1.4520 0.2960 0.0581 -0.0147 -0.0052 10 -98.5546 -0.2313 0.2188 -0.3239 0.3798 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -5.0526 -0.1358 0.0807 -0.0421 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0214] Fig.14 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0215] Seventh embodiment

[0216] Please refer to Fig.15 The optical imaging system 60 of the seventh embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0217] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is concave at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 is concave at the near optical axis.

[0218] The object-side surface S1 of the first lens L1 is convex at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is convex at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is concave at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0219] In the seventh embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the sixth embodiment meets the conditions in the following table.

[0220] Table 13

[0221]

[0222]

[0223] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0224] Table 14

[0225] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -11.9735 0.5916 -0.9965 1.0811 4.1622 -22.3229 42.6235 -31.8943 0.0000 0.0000 2 -12.7374 0.0662 -0.1645 0.9834 -5.4774 15.5150 -27.3195 18.9121 0.0000 0.0000 4 99.0000 -0.1282 -0.2686 -0.0121 -2.4031 4.8134 -7.1537 0.0000 0.0000 0.0000 5 26.6220 -0.2434 0.4104 -4.1079 14.8635 -39.4714 59.1475 -34.2270 0.0000 0.0000 6 -9.2775 -0.6630 2.0763 -15.6407 79.6838 -258.2601 487.4688 -475.0229 183.8407 0.0000 7 99.0000 -0.5529 1.4482 -5.4564 15.4478 -29.1284 33.8270 -20.9971 5.0426 0.1656 8 10.3654 -0.1785 0.6382 -2.9878 8.8594 -16.6013 19.7875 -14.3512 5.8450 -1.0592 9 -5.6065 -0.5953 1.2562 -2.2075 2.4995 -1.4502 0.2968 0.0584 -0.0148 -0.0056 10 -19.6016 -0.2364 0.2173 -0.3240 0.3798 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.1814 -0.1363 0.0810 -0.0421 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0226] Fig.16The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0227] Eighth embodiment

[0228] Please refer to Fig.17 The optical imaging system 60 of the eighth embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0229] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is convex at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0230] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 of the first lens L1 is convex near the circumference; the object-side surface S4 of the second lens L2 is concave near the circumference, and the image-side surface S5 of the second lens L2 is convex near the circumference; the object-side surface S6 of the third lens L3 is concave near the circumference, and the image-side surface S7 of the third lens L3 is convex near the circumference; the object-side surface S8 of the fourth lens L4 is concave near the circumference, and the image-side surface S9 of the fourth lens L4 is concave near the circumference; the object-side surface S10 of the fifth lens L5 is convex near the circumference, and the image-side surface S11 of the fifth lens L5 is concave near the circumference.

[0231] In the eighth embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the eighth embodiment meets the conditions in the following table.

[0232] Table 15

[0233]

[0234] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0235] Table 16

[0236]

[0237]

[0238] Fig.18 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0239] Ninth embodiment

[0240] Please refer to Fig.19 The optical imaging system 60 of the ninth embodiment includes, from the object side to the image side, a first lens L1 with positive refractive power, an aperture STO, 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, and an infrared filter L6.

[0241] Among them, the object side surface S1 of the first lens L1 is convex at the near optical axis, and the image side surface S2 of the first lens L1 is concave at the near optical axis; the object side surface S4 of the second lens L2 is concave at the near optical axis, and the image side surface S5 of the second lens L2 is convex at the near optical axis; the object side surface S6 of the third lens L3 is concave at the near optical axis, and the image side surface S7 of the third lens L3 is concave at the near optical axis; the object side surface S8 of the fourth lens L4 is concave at the near optical axis, and the image side surface S9 of the fourth lens L4 is convex at the near optical axis; the object side surface S10 of the fifth lens L5 is convex at the near optical axis, and the image side surface S11 of the fifth lens L5 is concave at the near optical axis.

[0242] The object-side surface S1 of the first lens L1 is concave at the near circumference, and the image-side surface S2 of the first lens L1 is convex at the near circumference; the object-side surface S4 of the second lens L2 is concave at the near circumference, and the image-side surface S5 of the second lens L2 is convex at the near circumference; the object-side surface S6 of the third lens L3 is concave at the near circumference, and the image-side surface S7 of the third lens L3 is convex at the near circumference; the object-side surface S8 of the fourth lens L4 is concave at the near circumference, and the image-side surface S9 of the fourth lens L4 is concave at the near circumference; the object-side surface S10 of the fifth lens L5 is convex at the near circumference, and the image-side surface S11 of the fifth lens L5 is concave at the near circumference.

[0243] In the ninth embodiment, the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the optical imaging system 10 in the ninth embodiment meets the conditions in the following table.

[0244] Table 17

[0245]

[0246]

[0247] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0248] Table 18

[0249] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 1 -13.6204 0.5420 -1.0495 0.9826 3.9506 -22.5513 42.6935 -32.4178 0.0000 0.0000 2 -27.9747 0.0398 -0.2575 0.7441 -5.6461 15.6277 -26.9671 20.2891 0.0000 0.0000 4 -99.0000 -0.0506 -0.2398 0.1786 -2.3171 4.4275 -1.7863 0.0000 0.0000 0.0000 5 4.3984 -0.2108 0.4716 -4.0521 15.0931 -38.9740 59.5716 -35.9347 0.0000 0.0000 6 -58.3008 -0.6826 2.0189 -15.6020 79.7991 -258.1325 487.4636 -475.4093 182.7323 0.0000 7 -3.3899 -0.5537 1.4353 -5.4444 15.4539 -29.1380 33.8082 -21.0118 5.0441 0.1948 8 21.3750 -0.1878 0.7160 -2.9956 8.7963 -16.6419 19.7823 -14.3365 5.8630 -1.0493 9 -4.6499 -0.5424 1.2379 -2.2240 2.4935 -1.4519 0.2962 0.0583 -0.0144 -0.0048 10 -17.9411 -0.2271 0.2160 -0.3243 0.3797 -0.2708 0.1149 -0.0284 0.0038 -0.0002 11 -4.3318 -0.1345 0.0805 -0.0422 0.0172 -0.0050 0.0009 -0.0001 0.0000 0.0000

[0250] Fig. 20The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the embodiment of the present application are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm pass through the lenses of the optical imaging system 10, the values ​​of the focus point deviation are all less than 0.05mm, indicating that the imaging quality of the embodiment of the present application is good; the reference wavelength of astigmatism and distortion is 555nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the arc field curvature and the meridional field curvature are both less than 0.05mm, and good compensation is obtained; the distortion curve indicates the distortion size values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, and the distortion is also well corrected.

[0251] Table 20 shows the values ​​of |sag51m-sag51s| / (sd51m-sd51s), et3 / (et23+et34), (sd21+sd22) / (sd11+sd12), f5 / sag51, |sag42| / et4, TTL / etal, |f3 / f|, Imgh / sd11, sd51 / atl and BF / et52 in the optical imaging system 10 of the first to ninth embodiments.

[0252] Form 19

[0253]

[0254]

[0255] Please refer to Fig.21 The imaging module 100 of the embodiment of the present application 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 .

[0256] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0257] Please continue to refer to Fig.21 The electronic device 1000 of the embodiment of the present application includes a housing 200 and an imaging module 100 , and the imaging module 100 is installed on the housing 200 for acquiring images.

[0258] The electronic device 1000 of the embodiment of the present application includes but is not limited to smart phones, car-mounted cameras, surveillance cameras, tablet computers, laptop computers, e-book readers, portable multimedia players (PMPs), portable phones, video phones, digital still cameras, mobile medical devices, wearable devices, and other electronic devices that support imaging.

[0259] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An optical imaging system, characterized in that: There are five lenses with refractive power, including: A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens having refractive power; A third lens element having negative refractive power; a fourth lens having positive refractive power, wherein the object side surface of the fourth lens is concave at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis; a fifth lens having negative refractive power, wherein the object side surface of the fifth lens is convex at the near optical axis, the image side surface of the fifth lens is concave at the near optical axis, and both the object side surface and the image side surface of the fifth lens are aspherical surfaces; The optical imaging system satisfies the following relationship: 1.2<|f3 / f|<4.2; 1.16≥(sd21+sd22) / (sd11+sd12)≥1.05; Among them, f3 is the effective focal length of the third lens, f is the effective focal length of the optical imaging system, sd21 is the maximum effective semi-aperture of the object side of the second lens, sd22 is the maximum effective semi-aperture of the image side of the second lens, sd11 is the maximum effective semi-aperture of the object side of the first lens, and sd12 is the maximum effective semi-aperture of the image side of the first lens.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: |sag51m-sag51s| / (sd51m-sd51s)>0.2; Among them, the object side surface of the fifth lens has a first intersection with the optical axis, the tangent plane of each point within the effective diameter of the object side surface of the fifth lens intersects with the plane perpendicular to the optical axis to form an acute angle, sag51m is the distance from the point with the largest acute angle to the first intersection in the direction of the optical axis; there is a second intersection at one quarter of the first intersection from the maximum effective semi-aperture from the first intersection to the object side surface of the fifth lens, sag51s is the distance from the first intersection to the second intersection in the direction of the optical axis; sd51m is the semi-aperture at the point with the largest acute angle; sd51s is the semi-aperture at the second intersection.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1 <et3 / (et23+et34)<4.2; Among them, et3 is the thickness of the maximum effective semi-aperture of the third lens in the direction of the optical axis, et23 is the distance from the maximum effective diameter of the image side surface of the second lens to the maximum effective diameter of the object side surface of the third lens in the direction of the optical axis, and et34 is the distance from the maximum effective diameter of the image side surface of the third lens to the maximum effective diameter of the object side surface of the fourth lens in the direction of the optical axis.

4. The optical imaging system according to claim 1, wherein: The first lens to the fourth lens and the object side surface and the image side surface are all aspherical surfaces.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 3.5 <f5 / sag51<20.5; Wherein, f5 is the effective focal length of the fifth lens; sag51 is the distance from the intersection of the object side surface of the fifth lens on the optical axis to the maximum effective semi-aperture of the object side surface of the fifth lens in the direction of the optical axis.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1.2 <sag42 / et4<3.2; Among them, sag42 is the distance from the intersection of the image side surface of the fourth lens on the optical axis to the maximum effective radius position of the image side surface of the fourth lens in the optical axis direction, and et4 is the thickness of the fourth lens at the maximum effective semi-aperture in the optical axis direction.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1.7 <TTL / etal<2.7; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and etal is the sum of the thicknesses of the maximum effective semi-apertures of the first lens to the fifth lens in the direction of the optical axis.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: Imgh / sd51>4.2; Wherein, Imgh is half of the image height corresponding to the maximum field angle of the optical imaging system, and sd51 is the maximum effective half-aperture of the object side of the fifth lens.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1.9 <sd51 / atl<4; Wherein, sd51 is the maximum effective semi-aperture of the object side of the fifth lens, and atl is the sum of the distances of the air gaps between two adjacent lenses from the first lens to the fifth lens on the optical axis.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: BF / et52>1; Among them, BF is the minimum distance from the image side surface of the fifth lens to the imaging surface of the optical imaging system in the direction of the optical axis, and et52 is the distance on the optical axis between the air gap between the maximum effective semi-aperture of the image side surface of the fifth lens and the filter.

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

Images