Optical imaging system, imaging module and electronic device

Abstract

The present invention proposes an optical imaging system, an imaging module and an electronic device. The optical imaging system includes: a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; a fourth lens with positive refractive power; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with positive refractive power; and an eighth lens with negative refractive power; the optical imaging system satisfies the following relationship: 0.6<TTL / (IMGH*2)≤0.7; 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 IMGH is half of the image height corresponding to the maximum field of view of the optical imaging system. The above optical imaging system adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which helps to improve the resolution of the optical imaging system in the central field of view and the edge field of view.

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, the development direction of portable imaging main lens is to use high-pixel or RYYB arrangement photosensitive chips to solve the problem of small photosensitive chip bottom leading to difficulty in improving image quality. Ultra-high pixels are achieved by combining photosensitive chips with high-resolution optical lenses to obtain extremely high resolution, which improves the image quality of night scene shooting to a higher level; RYYB arrangement photosensitive chips improve the sensitivity from the chip perspective, and at the same time, with the increase in chip size, it can also achieve good night scene shooting effects.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art: the existing eight-piece optical lens structure is difficult to meet the high resolution requirements of high-pixel photosensitive chips, causing the resolution at the edge of the effective area to drop rapidly, thereby affecting the imaging quality, and the existing eight-piece optical lens structure is large in size and difficult to meet the existing miniaturization requirements. 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 a refractive power, wherein the object side surface of the second lens is a convex surface at the near optical axis, and the image side surface of the second lens is a concave surface at the near optical axis;

[0008] a third lens having refractive power;

[0009] a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex 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 refractive power;

[0011] a sixth lens having a refractive power;

[0012] a seventh lens element having positive refractive power;

[0013] an eighth lens having negative refractive power, wherein the object side surface of the eighth lens is concave at the near optical axis, the object side surface and the image side surface of the eighth lens 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;

[0014] The optical imaging system satisfies the following relationship:

[0015] 0.6<TTL / (IMGH*2)≤0.7;

[0016] Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, and IMGH is half of the image height corresponding to the maximum field angle of the optical imaging system.

[0017] The above optical imaging system adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which is conducive to the miniaturization of the optical imaging system; by reasonably configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system in the central field of view and the edge field of view, so that it has high pixels, which is especially helpful to improve the image quality of the edge field of view.

[0018] In some embodiments, the object side surface of the third lens is convex at the near optical axis, and the image side surface is concave at the near optical axis; the object side surface of the fifth lens is concave, and both the object side surface and the image side surface are aspherical; the object side surface of the sixth lens is convex at the near optical axis, and both the object side surface and the image side surface are aspherical; the object side surface of the seventh lens is convex at the near optical axis, and both the object side surface and the image side surface of the seventh lens are aspherical; at least one of the object side surfaces and the image side surfaces of the fifth to seventh lenses is provided with at least one inflection point.

[0019] In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the overall size of the optical imaging system can be effectively reduced, occupying less space, and can effectively correct aberrations and improve imaging quality.

[0020] In some embodiments, the optical imaging system satisfies the following relationship:

[0021] 46.0mm<(|f2|+|f3|) / FNO<524.0mm;

[0022] Among them, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and FNO is the aperture number of the optical imaging system.

[0023] In this way, by changing the refractive power provided by the second lens and the third lens and compressing the large-diameter light, the light beams of each field of view are easier to adjust in the subsequent lenses, and the problem of poor optical performance sensitivity caused by large light deviation angles can be avoided.

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

[0025] |SLOM52| / f<7.6° / mm;

[0026] Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image side surface of the fifth lens and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system.

[0027] The effective focal length of the optical imaging system satisfies the following relationship: 4.6<f<5.7. With the eight-piece lens, the field of view of the optical imaging system can reach 91 degrees, which helps to obtain good sports shooting effects at a smaller sacrifice of the field of view when shooting sports videos; the angle between the cut surface of the edge of the effective diameter of the fifth lens and the plane perpendicular to the optical axis is maintained within a reasonable processing range, and no obvious recurve is observed. Combined with the change in surface shape, it helps to smoothly transition the edge light and reduce the risk of stray light; in addition, the edge thickness and middle thickness of the fifth lens are uniform, which is conducive to molding processing.

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

[0029] 3.0mm<(R61 / |R62|)*|f6|<148.0mm;

[0030] Among them, R61 is the curvature radius of the object side surface of the sixth lens at the optical axis, R62 is the curvature radius of the image side surface of the sixth lens at the optical axis, and f6 is the effective focal length of the sixth lens.

[0031] In this way, the surface shape of the sixth lens can be changed by changing the curvature radius of the object side surface and the image side surface of the sixth lens. For example, the surface shape of the sixth lens is W-shaped and C-shaped. The W-shaped surface shape can easily deflect the light of each field of view at a reasonable angle, which helps to reduce the sensitivity of optical performance and improve relative illumination; the C-shaped surface shape can better improve the compactness between lenses, reduce the overall thickness of the optical imaging system, and also have good optical characteristics; and by changing the refractive power of the sixth lens, in combination with other lenses, the comprehensive aberration of the optical imaging system can be balanced to improve the overall resolution.

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

[0033] (R71 / |R72|)*|SLOM41|<9.2°;

[0034] Among them, R71 is the curvature radius of the object side surface of the seventh lens at the optical axis, R72 is the curvature radius of the image side surface of the seventh lens at the optical axis, and SLOM41 is the angle between the tangent plane of the effective diameter edge of the object side surface of the fourth lens and the plane perpendicular to the optical axis.

[0035] Thus, the seventh lens has a W-shaped arrangement structure, and the aspheric surface introduces fewer high-order terms, which does not cause a drastic change in its surface shape. The inclination angle and thickness are reasonable, and it has good processing characteristics. Moreover, the light is reasonably offset, and the angle of the final incident imaging surface is small, which is conducive to the matching of the chip. In addition, the change in the angle between the tangent surface of the effective diameter edge of the object side of the fourth lens and the plane perpendicular to the optical axis can cause the surface shape of the object side to change, which correspondingly enhances the coordination effect of the fourth lens and the third lens, helps to reduce the stray light ghost image caused by light reflection, and improves the compactness of the structure.

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

[0037] 0.52<(ET1+ET2+ET3+ET4) / (CT1+CT2+CT3+CT4)<0.68;

[0038] Among them, ET1 is the distance between the effective diameter edge of the object side surface of the first lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface of the second lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface of the third lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface of the fourth lens and the effective diameter edge of the image side surface thereof in the optical axis direction, CT1 is the distance from the object side surface of the first lens to the image side surface thereof on the optical axis, CT2 is the distance from the object side surface of the second lens to the image side surface thereof on the optical axis, CT3 is the distance from the object side surface of the third lens to the image side surface thereof on the optical axis, and CT4 is the distance from the object side surface of the fourth lens to the image side surface thereof on the optical axis.

[0039] In this way, the rationality of the thickness and the gap is related to the difficulty of lens molding and manufacturing. When the above formula is satisfied, the thickness of the first lens to the fourth lens can be appropriate, and the spacing between the lenses is reasonable, which can effectively improve the compactness of the lens structure and facilitate the molding and assembly of the lens; in addition, the first lens to the fourth lens are combined together like a positive lens, and with the reduction of the effective diameter edge thickness and the compression of the aperture, the light with a large field of view can be reasonably deflected, and the primary aberration is introduced evenly, which helps to improve the assembly yield and the overall aberration balance.

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

[0041] 0.19<ET78 / CT78<0.45;

[0042] Among them, ET78 is the distance from the effective diameter edge of the image side surface of the seventh lens to the effective diameter edge of the object side surface of the eighth lens in the direction of the optical axis, and CT78 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the intersection of the object side surface of the eighth lens and the optical axis in the direction of the optical axis.

[0043] In this way, the reasonable maintenance of the gap distance between the seventh lens and the eighth lens can avoid excessive bending of the angle between the seventh lens and the eighth lens, which is beneficial to correcting the aberration generated by the optical imaging system under a large aperture, making the refractive power in the direction perpendicular to the optical axis uniform, which helps to improve the overall image quality and is easy to form and manufacture.

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

[0045] 0.45<(ET5+ET6+ET7) / CT57<0.7;

[0046] Among them, ET5 is the distance between the effective diameter edge of the object side surface of the fifth lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, ET6 is the distance between the effective diameter edge of the object side surface of the sixth lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, ET7 is the distance between the effective diameter edge of the object side surface of the seventh lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, and CT57 is the distance from the intersection of the object side surface of the fifth lens and the optical axis to the intersection of the image side surface of the seventh lens and the optical axis in the direction of the optical axis.

[0047] In this way, the middle thickness and edge thickness of the fifth to seventh lenses are reasonable, and the surface shape does not change too much, so that the optical imaging system has good molding characteristics; and the fifth to seventh lenses introduce a uniform amount of primary aberrations, which is easy to balance the overall aberrations, and can provide support for improving the image quality of a large image plane through reasonable changes in surface shape and refractive power; in addition, the amount of advanced aberrations is controllable, and the optical performance sensitivity of the optical imaging system can be effectively controlled.

[0048] The embodiment of the present application further proposes an imaging module, including:

[0049] Optical imaging systems; and

[0050] A photosensitive element is arranged on the image side of the optical imaging system.

[0051] The imaging module of the embodiment of the present invention includes an optical imaging system. The optical imaging system adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which is conducive to the miniaturization of the optical imaging system; by reasonably configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system in the central field of view and the edge field of view, so that it has high pixels, which is conducive to the miniaturization of the optical imaging system.

[0052] 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.

[0053] The electronic device of the embodiment of the present invention includes an imaging module. The optical imaging system in the imaging module adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which is conducive to the miniaturization of the optical imaging system; by reasonably configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system in the central field of view and the edge field of view, so that it has high pixels, which is conducive to the miniaturization of the optical imaging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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:

[0055] Figure 1 Schematic diagram of the structure of the optical imaging system according to the first embodiment of the present invention.

[0056] Figure 2 4 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the first embodiment of the present invention.

[0057] Figure 3 Schematic diagram of the structure of an optical imaging system according to a second embodiment of the present invention.

[0058] Figure 4 4 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the second embodiment of the present invention.

[0059] Figure 5 Schematic diagram of the structure of an optical imaging system according to the third embodiment of the present invention.

[0060] Figure 6 3 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the third embodiment of the present invention.

[0061] Figure 7 4 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

[0062] Figure 84 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the fourth embodiment of the present invention.

[0063] Fig. 9 4 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

[0064] Fig.10 4 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the fifth embodiment of the present invention.

[0065] Fig.11 4 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

[0066] Fig.12 4 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system in the sixth embodiment of the present invention.

[0067] Fig.13 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0068] Main component symbols

[0069] Electronic device 1000

[0070] Image acquisition module 100

[0071] Optical imaging system 10

[0072] First lens L1

[0073] Second lens L2

[0074] The third lens L3

[0075] The fourth lens L4

[0076] Fifth lens L5

[0077] Sixth lens L6

[0078] Seventh lens L7

[0079] The eighth lens L8

[0080] IR filter L9

[0081] Aperture STO

[0082] Object side S2, S4, S6, S8, S10, S12, S14, S16, S18

[0083] Like the side S3, S5, S7, S9, S11, S13, S15, S17, S19

[0084] Imaging surface S20

[0085] Photosensitive element 20

[0086] Housing 200 DETAILED DESCRIPTION

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 appreciate the application of other processes and / or the use of other materials.

[0092] 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 positive refractive power, a second lens L2 with refractive power, a third lens L3 with refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with positive refractive power and an eighth lens L8 with negative refractive power.

[0093] The first lens L1 has an object-side surface S2 and an image-side surface S3, the object-side surface S2 of the first lens L1 is convex at the near optical axis, and the image-side surface S3 of the first lens L1 is concave at the near optical axis; the second lens L2 has an object-side surface S4 and an image-side surface S5, 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 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, and the object-side surface S8 of the fourth lens L4 is convex at the near optical axis , the image side surface S9 is convex at the near optical axis; the fifth lens L5 has an object side surface S10 and an image side surface S11; the sixth lens L6 has an object side surface S12 and an image side surface S13; the seventh lens L7 has an object side surface S14 and an image side surface S15; the eighth lens L8 has an object side surface S16 and an image side surface S17, the object side surface S16 of the eighth lens L8 is concave at the near optical axis, the object side surface S16 and the image side surface S17 of the eighth lens L8 are both aspherical surfaces, and at least one of the object side surface S16 and the image side surface S17 is provided with at least one inflection point.

[0094] The optical imaging system 10 satisfies the following relationship:

[0095] 0.6<TTL / (IMGH*2)≤0.7;

[0096] Wherein, TTL is the distance on the optical axis from the object-side surface S2 of the first lens L1 to the imaging surface S20 of the optical imaging system 10 , and IMGH is half of the image height corresponding to the maximum field angle of the optical imaging system 10 .

[0097] The optical imaging system 10 adopts eight lenses, rationally configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which helps to improve the miniaturization of the optical imaging system 10; by rationally configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system 10 in the central field of view and the edge field of view, so that it has high pixels, which is particularly helpful to improve the image quality of the edge field of view.

[0098] In some embodiments, the object-side surface S6 of the third lens L3 is convex at the near optical axis, and the image-side surface S7 is concave at the near optical axis; the object-side surface S10 of the fifth lens L5 is concave, and both the object-side surface S10 and the image-side surface S11 thereof are aspherical surfaces; the object-side surface S12 of the sixth lens L6 is convex at the near optical axis, and both the object-side surface S12 and the image-side surface S13 thereof are aspherical surfaces; the object-side surface S14 of the seventh lens L7 is convex at the near optical axis, and both the object-side surface S14 and the image-side surface S15 of the seventh lens L7 are aspherical surfaces; at least one of the object-side surfaces and the image-side surfaces of the fifth lens L5 to the seventh lens L7 is provided with at least one inflection point.

[0099] The shape of an aspheric surface is determined by the following formula:

[0100]

[0101] 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.

[0102] In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the overall size of the optical imaging system 10 is effectively reduced, occupying less space, and can effectively correct aberrations and improve imaging quality.

[0103] In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO is used to reduce stray light and help improve image quality. Preferably, the stop STO is disposed on the object-side surface S2 of the first lens L1.

[0104] In some embodiments, the optical imaging system 10 further includes an infrared filter L9, and the infrared filter L9 has an object-side surface S18 and an image-side surface S19. The infrared filter L9 is disposed on the image side of the eighth lens L8, and the infrared filter L9 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 L9 is an infrared cutoff filter.

[0105] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0106] 46.0mm<(|f2|+|f3|) / FNO<524.0mm;

[0107] Wherein, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, and FNO is the aperture number of the optical imaging system 10.

[0108] In this way, the refractive power provided by the second lens L2 and the third lens L3 changes and the large-diameter light is compressed at the same time, so that the light beams of each field of view are easier to adjust in the subsequent lenses, and the problem of poor optical performance sensitivity caused by a large light deviation angle can be avoided.

[0109] Among them, the aperture number determines the total energy of the light incident on the imaging surface. The aperture number of this application satisfies the following relationship: 1.3≤FNO≤1.6. Within this range, the night scene shooting capability of the micro camera equipment can be improved, and it has good production feasibility; and the reduction of the aperture number will compress the size of the Airy disk, thereby having a higher resolution limit. However, when FNO>1.6, it is not conducive to solving the problem of dark corners around the imaging surface in insufficient light, and the effect of enhancing the shooting ability is poor; when FNO<1.3, the optical entrance pupil is larger, easy to be contaminated with dust, and the design is more difficult, which is not conducive to mass production.

[0110] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0111] |SLOM52| / f<7.6° / mm;

[0112] Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image-side surface S11 of the fifth lens L5 and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system 10.

[0113] The effective focal length of the optical imaging system 10 satisfies the following relationship: 4.6<f<5.7. With the eight-piece lens, the field of view of the optical imaging system 10 can reach 91 degrees, which helps to obtain a good motion shooting effect at a smaller sacrifice of the field of view when shooting motion videos; the angle between the cut surface of the edge of the effective diameter of the fifth lens and the plane perpendicular to the optical axis is maintained within a reasonable processing range, and no obvious recurve is observed. With the change of the surface shape, it helps to smoothly transition the edge light and reduce the risk of stray light; in addition, the edge thickness and middle thickness of the fifth lens are uniform, which is conducive to molding processing.

[0114] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0115] 3.0mm<(R61 / |R62|)*|f6|<148.0mm;

[0116] Wherein, R61 is the curvature radius of the object-side surface S12 of the sixth lens L6 at the optical axis, R62 is the curvature radius of the image-side surface S13 of the sixth lens L6 at the optical axis, and f6 is the effective focal length of the sixth lens L6.

[0117] In this way, by changing the curvature radii of the object-side surface S12 and the image-side surface S13 of the sixth lens L6, the surface shape of the sixth lens L6 can be changed. For example, the surface shape of the sixth lens L6 is W-shaped and C-shaped, wherein the W-shaped surface shape can easily deflect the light of each field of view at a reasonable angle, which helps to reduce the sensitivity of optical performance and improve relative illumination; the C-shaped surface shape can better improve the compactness between lenses, reduce the overall thickness of the optical imaging system 10, and also have good optical characteristics; and by changing the refractive power of the sixth lens L6, in cooperation with other lenses, the comprehensive aberrations of the optical imaging system 10 can be balanced and the overall resolution can be improved.

[0118] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0119] (R71 / |R72|)*|SLOM41|<9.2°;

[0120] Wherein, R71 is the curvature radius of the object-side surface S14 of the seventh lens L7 at the optical axis, R72 is the curvature radius of the image-side surface S15 of the seventh lens L7 at the optical axis, and SLOM41 is the angle between the tangent plane of the effective diameter edge of the object-side surface S8 of the fourth lens L4 and the plane perpendicular to the optical axis.

[0121] Thus, the seventh lens L7 has a W-shaped arrangement structure, and the aspheric surface introduces fewer high-order terms, which does not cause a drastic change in its surface shape. The inclination angle and thickness are reasonable, and it has good processing characteristics. In addition, the light is reasonably offset, and the angle of the final incident imaging surface is small, which is conducive to the matching of the chip. In addition, the change in the angle between the tangent surface of the effective diameter edge of the object side surface S8 of the fourth lens L4 and the plane perpendicular to the optical axis can cause the surface shape of the object side surface to change, which correspondingly enhances the coordination effect of the fourth lens L4 and the third lens L3, helps to reduce the stray light ghost image caused by light reflection, and improves the compactness of the structure.

[0122] In some embodiments, the optical imaging system satisfies the following relationship:

[0123] 0.52<(ET1+ET2+ET3+ET4) / (CT1+CT2+CT3+CT4)<0.68;

[0124] Wherein, ET1 is the distance between the effective diameter edge of the object side surface of the first lens L1 and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface S4 of the second lens L2 and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface S6 of the third lens L3 and the effective diameter edge of the image side surface S7 thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface S8 of the fourth lens L4 and the effective diameter edge of the image side surface S9 thereof in the optical axis direction, CT1 is the distance from the object side surface S2 of the first lens L1 to the image side surface S3 thereof on the optical axis, CT2 is the distance from the object side surface S4 of the second lens L2 to the image side surface S5 thereof on the optical axis, CT3 is the distance from the object side surface S6 of the third lens L3 to the image side surface S7 thereof on the optical axis, and CT4 is the distance from the object side surface S8 to the image side surface S9 thereof on the optical axis.

[0125] In this way, the rationality of the thickness and the gap is related to the difficulty of lens molding and manufacturing. When the above formula is satisfied, the thickness of the first lens L1 to the fourth lens L4 can be appropriate, and the spacing between the lenses is reasonable, which can effectively improve the compactness of the lens structure and facilitate the molding and assembly of the lenses. In addition, the first lens L1 to the fourth lens L4 are combined together like a positive lens. With the reduction of the thickness of the effective diameter edge and the compression of the aperture, the light with a large field angle can be reasonably deflected, and the primary aberration introduced is uniform, which is helpful to improve the assembly yield and the overall aberration balance.

[0126] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0127] 0.19<ET78 / CT78<0.45;

[0128] Wherein, ET78 is the distance from the effective diameter edge of the image side surface S14 of the seventh lens L7 to the effective diameter edge of the object side surface S15 of the eighth lens L8 in the optical axis direction, and CT78 is the distance from the intersection of the image side surface S14 of the seventh lens L7 and the optical axis to the intersection of the object side surface S16 of the eighth lens L8 and the optical axis in the optical axis direction.

[0129] In this way, the reasonable maintenance of the gap distance between the seventh lens L7 and the eighth lens L8 can avoid excessive bending of the angles of the seventh lens L7 and the eighth lens L8, which is beneficial to correcting the aberrations generated by the optical imaging system 10 under a large aperture, so that the refractive power in the direction perpendicular to the optical axis is evenly configured, which helps to improve the overall image quality and is easy to form and manufacture.

[0130] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0131] 0.45<(ET5+ET6+ET7) / CT57<0.7;

[0132] Among them, ET5 is the distance between the effective diameter edge of the object-side surface S10 of the fifth lens L5 and the effective diameter edge of the image-side surface thereof in the optical axis direction, ET6 is the distance between the effective diameter edge of the object-side surface S12 of the sixth lens L6 and the effective diameter edge of the image-side surface thereof in the optical axis direction, ET7 is the distance between the effective diameter edge of the object-side surface S14 of the seventh lens L7 and the effective diameter edge of the image-side surface thereof in the optical axis direction, and CT57 is the distance between the intersection of the object-side surface S10 of the fifth lens L5 and the optical axis to the intersection of the image-side surface S15 of the seventh lens L7 and the optical axis in the optical axis direction.

[0133] In this way, the middle thickness and edge thickness of the fifth lens L5 to the seventh lens L7 are reasonable, and the surface shape does not change too much, so that the optical imaging system has good molding characteristics; and the primary aberration amount introduced by the fifth lens L5 to the seventh lens L7 is uniform, which is easy to balance the overall aberration, and through reasonable changes in surface shape and refractive power, it can provide support for improving the image quality of a large image surface; in addition, the amount of advanced aberrations is controllable, and the optical performance sensitivity of the optical imaging system can be effectively controlled.

[0134] First embodiment

[0135] Please refer to Figure 1 The optical imaging system 10 of the first embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[0136] 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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is concave at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is concave at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is concave at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 is concave at the near optical axis.

[0137] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 is concave near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is concave near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is concave near the circumference; the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is concave near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is concave at the near circumference; the object side surface S11 of the sixth lens L6 is concave at the near circumference, and the image side surface S12 is convex at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is convex at the near circumference, and the image side surface S16 is convex at the near circumference.

[0138] The reference wavelengths of the focal length, refractive index and Abbe number in the first embodiment are all 587 nm, and the optical imaging system 10 in the first embodiment meets the conditions in the following table.

[0139] Table 1

[0140]

[0141] 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.

[0142] Table 2

[0143]

[0144]

[0145] Figure 2 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the first embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 2 It can be seen that the optical imaging system 10 provided in the first embodiment can achieve good imaging quality.

[0146] Second embodiment

[0147] Please refer to Figure 3The optical imaging system 20 of the second embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[0148] 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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is concave at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is convex at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is concave at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 is concave at the near optical axis.

[0149] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 is convex near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is concave near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is concave near the circumference; the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is concave near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is convex at the near circumference; the object side surface S11 of the sixth lens L6 is concave at the near circumference, and the image side surface S12 is convex at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is concave at the near circumference, and the image side surface S16 is convex at the near circumference.

[0150] The reference wavelengths of the focal length, refractive index and Abbe number in the second embodiment are all 587 nm, and the optical imaging system 10 in the second embodiment meets the conditions in the following table.

[0151] Table 3

[0152]

[0153] 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.

[0154] Table 4

[0155]

[0156]

[0157] Figure 4 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the second embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 4 It can be seen that the optical imaging system 10 provided in the second embodiment can achieve good imaging quality.

[0158] Third embodiment

[0159] Please refer to Figure 5 The optical imaging system 30 of the third embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is concave at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is concave at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is concave at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 is concave at the near optical axis.

[0161] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 is concave near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is convex near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is concave near the circumference; the object-side surface S7 of the fourth lens L4 is convex near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is convex near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is convex at the near circumference; the object side surface S11 of the sixth lens L6 is convex at the near circumference, and the image side surface S12 is concave at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is convex at the near circumference, and the image side surface S16 is convex at the near circumference.

[0162] The reference wavelengths of the focal length, refractive index and Abbe number in the third embodiment are all 587 nm, and the optical imaging system 10 in the third embodiment meets the conditions in the following table.

[0163] Table 5

[0164]

[0165] 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.

[0166] Table 6

[0167]

[0168]

[0169] Figure 6 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the third embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 6 It can be seen that the optical imaging system 10 provided in the third embodiment can achieve good imaging quality.

[0170] Fourth embodiment

[0171] Please refer to Figure 7The optical imaging system 40 of the fourth embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is concave at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is concave at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is concave at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 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 is concave near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is concave near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is concave near the circumference; the object-side surface S7 of the fourth lens L4 is convex near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is convex near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is convex at the near circumference; the object side surface S11 of the sixth lens L6 is concave at the near circumference, and the image side surface S12 is convex at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is concave at the near circumference, and the image side surface S16 is convex at the near circumference.

[0174] The reference wavelengths of the focal length, refractive index and Abbe number in the fourth embodiment are all 587 nm, and the optical imaging system 10 in the fourth embodiment meets the conditions in the following table.

[0175] Table 7

[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 8

[0179]

[0180]

[0181] Figure 8 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fourth embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 8 It can be seen that the optical imaging system 10 provided in the fourth embodiment can achieve good imaging quality.

[0182] Fifth embodiment

[0183] Please refer to Fig. 9 and Fig.10 The optical imaging system 50 of the fifth embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[0184] 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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is convex at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is concave at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is convex at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 is concave at the near optical axis.

[0185] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 is concave near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is concave near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is concave near the circumference; the object-side surface S7 of the fourth lens L4 is convex near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is convex near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is convex at the near circumference; the object side surface S11 of the sixth lens L6 is concave at the near circumference, and the image side surface S12 is convex at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is concave at the near circumference, and the image side surface S16 is convex at the near circumference.

[0186] The reference wavelengths of the focal length, refractive index and Abbe number in the fifth embodiment are all 587 nm, and the optical imaging system 10 in the fifth embodiment meets the conditions in the following table.

[0187] Table 9

[0188]

[0189]

[0190] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the 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.

[0191] Table 10

[0192]

[0193]

[0194] Fig.10 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fifth embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Fig.10 It can be seen that the optical imaging system 10 provided in the fifth embodiment can achieve good imaging quality.

[0195] Sixth embodiment

[0196] Please refer to Fig.11The optical imaging system 60 of the sixth embodiment includes, from the object side to the image side, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with negative refractive power, and an infrared filter L9.

[0197] 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 is concave at the near optical axis; the object side surface S3 of the second lens L2 is convex at the near optical axis, and the image side surface S4 is concave at the near optical axis; the object side surface S5 of the third lens L3 is convex at the near optical axis, and the image side surface S6 is concave at the near optical axis; the object side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image side surface S8 is convex at the near optical axis; the fifth The object side surface S9 of the lens L5 is concave at the near optical axis, and the image side surface S10 is convex at the near optical axis; the object side surface S11 of the sixth lens L6 is convex at the near optical axis, and the image side surface S12 is concave at the near optical axis; the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 is convex at the near optical axis; the object side surface S15 of the eighth lens L8 is concave at the near optical axis, and the image side surface S16 is concave at the near optical axis.

[0198] The object-side surface S1 of the first lens L1 is convex near the circumference, and the image-side surface S2 is convex near the circumference; the object-side surface S3 of the second lens L2 is convex near the circumference, and the image-side surface S4 is concave near the circumference; the object-side surface S5 of the third lens L3 is concave near the circumference, and the image-side surface S6 is convex near the circumference; the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the image-side surface S8 is convex near the circumference; the fifth lens L4 is concave near the circumference, and the image-side surface S9 is convex near the circumference; The object side surface S9 of the lens L5 is concave at the near circumference, and the image side surface S10 is convex at the near circumference; the object side surface S11 of the sixth lens L6 is concave at the near circumference, and the image side surface S12 is convex at the near circumference; the object side surface S13 of the seventh lens L7 is concave at the near circumference, and the image side surface S14 is convex at the near circumference; the object side surface S15 of the eighth lens L8 is concave at the near circumference, and the image side surface S16 is convex at the near circumference.

[0199] The reference wavelengths of the focal length, refractive index and Abbe number in the sixth embodiment are all 587 nm, and the optical imaging system 10 in the sixth embodiment meets the conditions in the following table.

[0200] Table 11

[0201]

[0202]

[0203] It should be noted that f is the focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the 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.

[0204] Table 12

[0205]

[0206]

[0207] Fig.12 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the sixth embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve represents the meridional image curvature and the sagittal image curvature; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Fig.12 It can be seen that the optical imaging system 10 provided in the sixth embodiment can achieve good imaging quality.

[0208] Table 13 shows the values ​​of TTL / (IMGH*2), (|f2|+|f3|) / FNO, |SLOM52| / f, (R61 / |R62|)*|f6|, (R71 / |R72|)*|SLOM41|, (ET1+ET2+ET3+ET4) / (CT1+CT2+CT3+CT4), ET78 / CT78 and (ET5+ET6+ET7) / CT57 in the optical imaging system 10 of the first to sixth embodiments.

[0209] Form 15

[0210]

[0211] Please refer to Fig.13 The imaging module 100 of the embodiment of the present invention includes an optical imaging system 10 and a photosensitive element 80 , and the photosensitive element 20 is arranged on the image side of the optical imaging system 10 .

[0212] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0213] The optical imaging system 10 in the imaging module 100 of the embodiment of the present invention adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which is conducive to the miniaturization of the optical imaging system 10; by reasonably configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system 10 in the central field of view and the edge field of view, so that it has high pixels, which is particularly helpful to improve the image quality of the edge field of view.

[0214] Please continue to refer to Fig.13 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 installed on the housing 200 for acquiring images.

[0215] The electronic device 1000 of the embodiment of the present invention includes but is not limited to smart phones, car 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.

[0216] The optical imaging system 10 in the electronic device 1000 of the above embodiment adopts eight lenses, reasonably configures the refractive power of each lens, and reduces the surface complexity of each lens, so that the total optical length is small, which is conducive to the miniaturization of the optical imaging system 10; by reasonably configuring the TTL / IMGH value, it helps to improve the resolution of the optical imaging system 10 in the central field of view and the edge field of view, so that it has high pixels, which is particularly helpful to improve the image quality of the edge field of view.

[0217] 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.

[0218] 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: From the object side to the image side, it includes: 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 a refractive power, wherein the object side surface of the second lens is a convex surface at the near optical axis, and the image side surface of the second lens is a concave surface at the near optical axis; a third lens having a refractive power, wherein the object side surface of the third lens is a convex surface at the near optical axis, and the image side surface of the third lens is a concave surface at the near optical axis; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex 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 a refractive power, wherein the object side surface of the fifth lens is a concave surface, and both the object side surface and the image side surface thereof are aspherical surfaces; a sixth lens having a refractive power, wherein the object side surface of the sixth lens is a convex surface near the optical axis, and both the object side surface and the image side surface are aspherical surfaces; a seventh lens having positive refractive power, wherein the object side surface of the seventh lens is convex at the near optical axis, the object side surface and the image side surface of the seventh lens are both aspherical surfaces, and at least one of the object side surface and the image side surface of the fifth lens to the seventh lens is provided with at least one inflection point; an eighth lens having negative refractive power, wherein the object side surface of the eighth lens is concave at the near optical axis, the object side surface and the image side surface of the eighth lens 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; The optical imaging system further comprises an aperture, which is arranged on the object side of the first lens; The optical imaging system satisfies the following relationship: 0.6<TTL / (IMGH*2)≤0.7; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, and IMGH is half of the image height corresponding to the maximum field angle of the optical imaging system.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 46.0mm<(|f2|+|f3|) / FNO<524.0mm; Among them, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and FNO is the aperture number of the optical imaging system.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: |SLOM52| / f<7.6° / mm; Wherein, SOLM52 is the angle between the tangent plane of the effective diameter edge of the image side surface of the fifth lens and the plane perpendicular to the optical axis, and f is the effective focal length of the optical imaging system.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 3.0mm<(R61 / |R62|)*|f6|<148.0mm; Among them, R61 is the curvature radius of the object side surface of the sixth lens at the optical axis, R62 is the curvature radius of the image side surface of the sixth lens at the optical axis, and f6 is the effective focal length of the sixth lens.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: (R71 / |R72|)*|SLOM41|<9.2°; Among them, R71 is the curvature radius of the object side surface of the seventh lens at the optical axis, R72 is the curvature radius of the image side surface of the seventh lens at the optical axis, and SLOM41 is the angle between the tangent plane of the effective diameter edge of the object side surface of the fourth lens and the plane perpendicular to the optical axis.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.52<(ET1+ET2+ET3+ET4) / (CT1+CT2+CT3+CT4)<0.68; Among them, ET1 is the distance between the effective diameter edge of the object side surface of the first lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET2 is the distance between the effective diameter edge of the object side surface of the second lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET3 is the distance between the effective diameter edge of the object side surface of the third lens and the effective diameter edge of the image side surface thereof in the optical axis direction, ET4 is the distance between the effective diameter edge of the object side surface of the fourth lens and the effective diameter edge of the image side surface thereof in the optical axis direction, CT1 is the distance from the object side surface of the first lens to the image side surface thereof on the optical axis, CT2 is the distance from the object side surface of the second lens to the image side surface thereof on the optical axis, CT3 is the distance from the object side surface of the third lens to the image side surface thereof on the optical axis, and CT4 is the distance from the object side surface of the fourth lens to the image side surface thereof on the optical axis.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.19<ET78 / CT78<0.45; Among them, ET78 is the distance from the effective diameter edge of the image side surface of the seventh lens to the effective diameter edge of the object side surface of the eighth lens in the direction of the optical axis, and CT78 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the intersection of the object side surface of the eighth lens and the optical axis 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: 0.45<(ET5+ET6+ET7) / CT57<0.7; Among them, ET5 is the distance between the effective diameter edge of the object side surface of the fifth lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, ET6 is the distance between the effective diameter edge of the object side surface of the sixth lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, ET7 is the distance between the effective diameter edge of the object side surface of the seventh lens and the effective diameter edge of the image side surface thereof in the direction of the optical axis, and CT57 is the distance from the intersection of the object side surface of the fifth lens and the optical axis to the intersection of the image side surface of the seventh lens and the optical axis in the direction of the optical axis.

9. An imaging module, characterized in that: include: The optical imaging system according to any one of claims 1 to 8; and A photosensitive element is arranged on the image side of the optical imaging system.

10. An electronic device, characterized in that: include: case; and The imaging module described in claim 9 is mounted on the housing.

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