Optical systems, imaging modules and electronic equipment

Abstract

The present invention relates to an optical system, an imaging module and an electronic device. The optical system comprises an aperture; a first lens with positive refractive power, the object side surface is convex at the paraxial position; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with positive refractive power, the image side surface is convex at the paraxial position; a seventh lens with refractive power; an eighth lens with refractive power, the image side surface is concave at the paraxial position; the optical system satisfies: (MIN6*MAX8 / MAX6*MIN8)≤2; MIN6 is the minimum thickness of the sixth lens in the direction parallel to the optical axis, MAX6 is the maximum thickness of the sixth lens in the direction parallel to the optical axis, MIN8 is the minimum thickness of the eighth lens in the direction parallel to the optical axis, and MAX8 is the maximum thickness of the eighth lens in the direction parallel to the optical axis. The wide-angle characteristics and astigmatism of the optical system can be balanced.

Description

Technical Field

[0001] The present invention relates to the field of photography, and in particular to an optical system, an imaging module and electronic equipment. Background Art

[0002] With the development of camera technology, people have higher and higher requirements for the camera function of camera devices. While pursuing high imaging quality, they also put forward higher requirements for the field of view. The larger the maximum field of view of the camera device, the more information can be obtained during shooting, thereby improving shooting efficiency. However, in current camera devices, when the optical system has a large field of view, it is difficult to balance the wide-angle characteristic and astigmatism, that is, when having a large field of view, the astigmatism is usually large, which affects the imaging quality of the optical system. Summary of the invention

[0003] Based on this, it is necessary to provide an optical system, an imaging module and an electronic device to address the problem that a large field of view and astigmatism are difficult to balance in current optical systems.

[0004] An optical system, comprising, from the object side to the image side, the following:

[0005] Aperture;

[0006] A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the paraxial position;

[0007] a second lens having refractive power;

[0008] a third lens having refractive power;

[0009] a fourth lens having a refractive power;

[0010] a fifth lens having refractive power;

[0011] a sixth lens having positive refractive power, wherein the image side surface of the sixth lens is convex at the paraxial position;

[0012] a seventh lens having refractive power;

[0013] an eighth lens having refractive power, wherein the image side surface of the eighth lens is concave at the paraxial position;

[0014] And the optical system satisfies the following conditional formula:

[0015] (MIN6*MAX8 / MAX6*MIN8)≤2;

[0016] Among them, MIN6 is the minimum thickness of the sixth lens in the direction parallel to the optical axis within the maximum effective aperture of the sixth lens, MAX6 is the maximum thickness of the sixth lens in the direction parallel to the optical axis within the maximum effective aperture of the sixth lens, MIN8 is the minimum thickness of the eighth lens in the direction parallel to the optical axis within the maximum effective aperture of the eighth lens, and MAX8 is the maximum thickness of the eighth lens in the direction parallel to the optical axis within the maximum effective aperture of the eighth lens.

[0017] When the optical system satisfies the above conditional formula, the thickness of the sixth lens and the eighth lens can be reasonably configured to balance the wide-angle characteristic and the astigmatism, so that the optical system has a large field of view while the astigmatism is not too large, thereby ensuring that the optical system has excellent imaging quality. In addition, the injection molding yield of the sixth lens and the eighth lens in the production process can be improved, thereby reducing the production cost.

[0018] In one embodiment, the optical system satisfies the following condition:

[0019] (SAG61+SAG62) / (SAG71+SAG72)≤2;

[0020] Among them, SAG61 is the distance from the intersection of the object side surface of the sixth lens and the optical axis to the maximum effective radius position of the object side surface of the sixth lens in the direction parallel to the optical axis, SAG62 is the distance from the intersection of the image side surface of the sixth lens and the optical axis to the maximum effective radius position of the image side surface of the sixth lens in the direction parallel to the optical axis, SAG71 is the distance from the intersection of the object side surface of the seventh lens and the optical axis to the maximum effective radius position of the object side surface of the seventh lens in the direction parallel to the optical axis, and SAG72 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective radius position of the image side surface of the seventh lens in the direction parallel to the optical axis. When the above conditional expressions are met, the sixth lens and the seventh lens can be reasonably configured to reduce the tolerances of the sixth lens and the seventh lens generated during the injection molding process, and the tolerances generated during the lens barrel molding process. The influence on the imaging quality of the optical system during assembly. At the same time, it is also beneficial to balance the wide-angle characteristics and distortion of the optical system, so that the optical system has a large field of view while the distortion is not too large, thereby ensuring that the optical system has excellent imaging quality.

[0021] In one embodiment, the optical system satisfies the following condition:

[0022] 0≤Y71-Y62≤1mm;

[0023] Wherein, Y62 is the maximum effective aperture of the image side of the sixth lens, and Y71 is the maximum effective aperture of the object side of the seventh lens. When the above conditional formula is met, the sixth lens and the seventh lens can be reasonably configured to make the structure of the optical system more compact to meet the needs of miniaturized design, while making the optical system have a larger field of view. In addition, the structure of the optical system is more compact, which can make the air gap between the sixth lens and the seventh lens at the edge shorter, thereby eliminating the pressing plate between the sixth lens and the seventh lens, thereby reducing the generation of stray light and improving the imaging quality of the optical system.

[0024] In one embodiment, the optical system satisfies the following condition:

[0025] 3mm / degree≤100*ΣCT / FOV≤5mm / degree;

[0026] Wherein, ΣCT is the sum of the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens on the optical axis, and FOV is the maximum field of view of the optical system. When the above conditional formula is met, the wide-angle characteristic and the thickness of each lens on the optical axis of the optical system can be balanced, so that the optical system has a large field of view and a shorter total system length.

[0027] In one embodiment, the optical system satisfies the following condition:

[0028] 0≤(CT7+CT8) / CT6≤2;

[0029] Wherein, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis. When the above conditional formula is satisfied, the thicknesses of the sixth lens, the seventh lens, and the eighth lens on the optical axis can be reasonably configured to balance the wide-angle characteristics and aberrations of the optical system, so that the optical system has a large field of view while the aberrations are not too large, thereby ensuring that the optical system has excellent imaging quality.

[0030] In one embodiment, the optical system satisfies the following condition:

[0031] (ET2+ET3) / (CT2+CT3)≤1;

[0032] Among them, ET2 is the distance from the maximum effective aperture of the object side of the second lens to the maximum effective aperture of the image side of the second lens in a direction parallel to the optical axis, ET3 is the distance from the maximum effective aperture of the object side of the third lens to the maximum effective aperture of the image side of the third lens in a direction parallel to the optical axis, CT2 is the thickness of the second lens at the optical axis, and CT3 is the thickness of the third lens at the optical axis. When the above conditional formula is met, the thickness of the second lens and the third lens can be reasonably configured, which is conducive to achieving a large field of view. At the same time, the deflection angle of the light passing through the second lens and the third lens can be made smaller to reduce the generation of stray light in the optical system and improve the imaging quality of the optical system. In addition, the sensitivity of the second lens and the third lens can also be reduced, which is conducive to the injection molding and assembly of the second lens and the third lens, and the injection molding yield of the second lens and the third lens is improved to reduce the production cost of the second lens and the third lens.

[0033] In one embodiment, the optical system satisfies the following condition:

[0034] 1≤TTL / f≤2;

[0035] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and f is the total effective focal length of the optical system. When the above conditional formula is met, the total system length and the total effective focal length of the optical system can be reasonably configured to shorten the total system length of the optical system and achieve a miniaturized design.

[0036] In one embodiment, the optical system satisfies the following condition:

[0037] 1≤TTL / ImgH≤2;

[0038] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ImgH is half of the diagonal length of the effective pixel area of ​​the optical system on the imaging surface. When the above conditional formula is met, it is beneficial to shorten the total length of the optical system to achieve a miniaturized design.

[0039] In one embodiment, the optical system satisfies the following condition:

[0040] -10≤f67 / f≤3;

[0041] Wherein, f67 is the combined focal length of the sixth lens and the seventh lens, and f is the total effective focal length of the optical system. When the above conditional formula is satisfied, the combined focal length of the sixth lens and the seventh lens and the total effective focal length of the optical system can be reasonably configured to facilitate correction of the spherical aberration generated by off-axis light rays of the optical system at different aperture positions, thereby improving the imaging quality of the optical system.

[0042] In one embodiment, the optical system satisfies the following condition:

[0043] -23≤f4 / f≤24;

[0044] Wherein, f4 is the effective focal length of the fourth lens, and f is the total effective focal length of the optical system. When the above conditional formula is met, the effective focal length of the fourth lens and the total effective focal length of the optical system can be reasonably configured to expand the maximum field of view of the optical system and achieve a large field of view effect, while being conducive to shortening the total length of the optical system and achieving a miniaturized design.

[0045] An imaging module comprises a photosensitive element and the optical system described in any of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system, and light is imaged on the photosensitive element after passing through the optical system. The above optical system is used in the imaging module, and by balancing the wide-angle characteristics and astigmatism of the optical system, it is ensured that the imaging module has a large field of view while the astigmatism is not too large, thereby ensuring that the imaging module has excellent imaging quality.

[0046] An electronic device comprises a housing and the above-mentioned imaging module, wherein the imaging module is arranged in the housing. The above-mentioned imaging module is used in the electronic device, so that the electronic device has a large field of view and the astigmatism is not too large, thereby ensuring that the electronic device has excellent imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of an optical system in a first embodiment of the present application;

[0048] Figure 2 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the first embodiment of the present application;

[0049] Figure 3 is a schematic diagram of an optical system in a second embodiment of the present application;

[0050] Figure 4 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the second embodiment of the present application;

[0051] Figure 5is a schematic diagram of an optical system in a third embodiment of the present application;

[0052] Figure 6 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the third embodiment of the present application;

[0053] Figure 7 is a schematic diagram of an optical system in a fourth embodiment of the present application;

[0054] Figure 8 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fourth embodiment of the present application;

[0055] Fig. 9 is a schematic diagram of an optical system in a fifth embodiment of the present application;

[0056] Fig.10 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment of the present application;

[0057] Fig.11 is a schematic diagram of an optical system in a sixth embodiment of the present application;

[0058] Fig.12 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the sixth embodiment of the present application;

[0059] Fig.13 is a schematic diagram of an optical system in a seventh embodiment of the present application;

[0060] Fig.14 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the seventh embodiment of the present application;

[0061] Fig.15 is a schematic diagram of an imaging module in an embodiment of the present application;

[0062] Fig.16 It is a schematic diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0064] 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", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0069] See also Figure 1 In some embodiments of the present application, the optical system 100 includes, from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. Specifically, the first lens L1 includes an object-side surface S1 and an image-side surface S2, the second lens L2 includes an object-side surface S3 and an image-side surface S4, the third lens L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens L5 includes an object-side surface S9 and an image-side surface S10, the sixth lens L6 includes an object-side surface S11 and an image-side surface S12, the seventh lens L7 includes an object-side surface S13 and an image-side surface S14, and the eighth lens L8 includes an object-side surface S15 and an image-side surface S16.

[0070] Among them, the first lens L1 has positive refractive power, which helps to shorten the total length of the optical system 100, and the object side surface S1 of the first lens L1 is convex at the paraxial position, which can further strengthen the positive refractive power of the first lens L1, so that the size of the optical system 100 in the optical axis direction becomes shorter, which is conducive to the miniaturization design of the optical system 100. The second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the seventh lens L7 all have refractive power. The sixth lens L6 has positive refractive power, and the image side surface S12 of the sixth lens L6 is convex at the paraxial position. The eighth lens L8 has refractive power, and the image side surface S16 of the eighth lens L8 is concave at the paraxial position.

[0071] In addition, in some embodiments, the optical system 100 is provided with a stop STO, which can be provided on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L9 provided on the image side of the eighth lens L8, and the infrared filter L9 includes an object side surface S17 and an image side surface S18. Further, the optical system 100 further includes an image plane S19 located on the image side of the eighth lens L8, and the image plane S19 is the imaging plane of the optical system 100. The incident light can be imaged on the image plane S19 after being adjusted by the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8. It is worth noting that the infrared filter L9 can be an infrared cut-off filter, which is used to filter out interference light and prevent the interference light from reaching the image plane S19 of the optical system 100 and affecting normal imaging.

[0072] In some embodiments, the object side and image side of each lens of the optical system 100 are both aspherical. The use of aspherical structures can improve the flexibility of lens design, effectively correct spherical aberration, and improve imaging quality. In other embodiments, the object side and image side of each lens of the optical system 100 can also be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surface of each lens in the optical system 100 can be any combination of aspherical or spherical surfaces.

[0073] In some embodiments, the material of each lens in the optical system 100 can be glass or plastic. The use of plastic lenses can reduce the weight of the optical system 100 and reduce the production cost, and can achieve a lightweight and compact design of the optical system in conjunction with the smaller size of the optical system. The use of glass lenses enables the optical system 100 to have excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 can also be any combination of glass and plastic, and does not necessarily have to be glass or plastic.

[0074] It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there may be two or more lenses in the first lens L1. The two or more lenses can form a cemented lens. The surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and the surface closest to the image side can be regarded as the image side surface S2. Alternatively, the lenses in the first lens L1 do not form a cemented lens, but the distances between the lenses are relatively fixed. In this case, the object side surface of the lens closest to the object side is the object side surface S1, and the image side surface of the lens closest to the image side is the image side surface S2. In addition, in some embodiments, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, or the eighth lens L8 can also be greater than or equal to two, and any adjacent lenses can form a cemented lens or a non-cemented lens.

[0075] Furthermore, in some embodiments, the optical system 100 satisfies the conditional formula: (MIN6*MAX8 / MAX6*MIN8)≤2; wherein, within the maximum effective aperture of the sixth lens L6, MIN6 is the minimum thickness of the sixth lens L6 in the direction parallel to the optical axis, MAX6 is the maximum thickness of the sixth lens L6 in the direction parallel to the optical axis, and within the maximum effective aperture of the eighth lens L8, MIN8 is the minimum thickness of the eighth lens L8 in the direction parallel to the optical axis, and MAX8 is the maximum thickness of the eighth lens L8 in the direction parallel to the optical axis. Specifically, (MIN6*MAX8 / MAX6*MIN8) may be: 0.810, 0.885, 0.912, 0.963, 1.058, 1.132, 1.297, 1.326, 1.455, or 1.573. When the above conditional expression is satisfied, the thickness of the sixth lens L6 and the eighth lens L8 can be reasonably configured to balance the wide-angle characteristic and the astigmatism, so that the optical system 100 has a large field of view while the astigmatism is not too large, thereby ensuring that the optical system 100 has excellent imaging quality. In addition, the injection molding yield of the sixth lens L6 and the eighth lens L8 in the production process can be improved, thereby reducing the production cost. Further, in some embodiments, the optical system 100 satisfies the conditional expression: 0.81≤(MIN6*MAX8 / MAX6*MIN8)≤1.57. When the above relationship is satisfied, the large field of view and the astigmatism of the optical system 100 can be better balanced, and the injection molding yield of the sixth lens L6 and the eighth lens L8 is also greater.

[0076] In some embodiments, the optical system 100 satisfies the conditional formula: (SAG61+SAG62) / (SAG71+SAG72)≤2; wherein SAG61 is the distance from the intersection of the object-side surface S11 of the sixth lens L6 and the optical axis to the position of the maximum effective radius of the object-side surface S11 of the sixth lens L6 in a direction parallel to the optical axis, SAG62 is the distance from the intersection of the image-side surface S12 of the sixth lens L6 and the optical axis to the position of the maximum effective radius of the image-side surface S12 of the sixth lens L6 in a direction parallel to the optical axis, SAG71 is the distance from the intersection of the object-side surface S13 of the seventh lens L7 and the optical axis to the position of the maximum effective radius of the object-side surface S13 of the seventh lens L7 in a direction parallel to the optical axis, and SAG72 is the distance from the intersection of the image-side surface S14 of the seventh lens L7 and the optical axis to the position of the maximum effective radius of the image-side surface S14 of the seventh lens L7 in a direction parallel to the optical axis. Specifically, (SAG61+SAG62) / (SAG71+SAG72) can be: 0.498, 0.556, 0.628, 0.795, 0.835, 0.966, 0.987, 1.023, 1.165 or 1.243. When the above conditional formula is met, the sixth lens L6 and the seventh lens L7 can be reasonably configured to reduce the tolerances of the sixth lens L6 and the seventh lens L7 generated during the injection molding process, and the tolerances generated during the lens barrel molding process. The impact on the imaging quality of the optical system 100 during assembly. At the same time, it is also beneficial to balance the wide-angle characteristics and distortion of the optical system 100, so that the optical system 100 has a large field of view while the distortion is not too large, thereby ensuring that the optical system 100 has excellent imaging quality. Further, in some embodiments, the optical system 100 satisfies the conditional expression: 0.5≤(SAG61+SAG62) / (SAG71+SAG72)≤1.24. When the above conditional expression is satisfied, the large field of view and distortion of the optical system 100 can be better balanced, and the influence of the tolerance of the sixth lens L6 and the seventh lens L7 generated during the injection molding process on the imaging quality of the optical system 100 can be further reduced.

[0077] In some embodiments, the optical system 100 satisfies the conditional formula: 0≤Y71-Y62≤1; wherein Y62 is the maximum effective aperture of the image-side surface S12 of the sixth lens L6, and Y71 is the maximum effective aperture of the object-side surface S13 of the seventh lens L7. Specifically, Y71-Y62 can be: 0.101, 0.159, 0.214, 0.239, 0.357, 0.369, 0.412, 0.475, 0.503 or 0.512, and the numerical unit is mm. When the above conditional formula is satisfied, the sixth lens L6 and the seventh lens L7 can be reasonably configured, so that the structure of the optical system 100 is more compact to meet the requirements of miniaturized design, and at the same time, the optical system 100 has a larger field of view. In addition, the structure of the optical system 100 is more compact, which can make the air gap between the sixth lens L6 and the seventh lens L7 at the edge shorter, thereby eliminating the need for a press between the sixth lens L5 and the seventh lens L7, thereby reducing the generation of stray light and improving the imaging quality of the optical system 100. Further, in some embodiments, the optical system 100 satisfies the conditional formula: 0.1≤Y71-Y62≤0.51. When the above conditional formula is satisfied, the optical system 100 is more likely to achieve a miniaturized design and a large field of view, and the imaging quality of the optical system 100 is also better.

[0078] In some embodiments, the optical system 100 satisfies the conditional formula: 3≤100*ΣCT / FOV≤5; wherein ΣCT is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 on the optical axis, and FOV is the maximum field of view of the optical system 100. Specifically, 100*ΣCT / FOV can be: 3.042, 3.189, 3.252, 3.561, 3.675, 3.852, 4.023, 4.567, 4.711, or 4.926, and the numerical unit is mm / degree. When the above conditional formula is satisfied, the wide-angle characteristic and the thickness of each lens on the optical axis of the optical system 100 can be balanced, so that the optical system 100 has a large field of view and a short total system length. Furthermore, in some embodiments, the optical system 100 satisfies the conditional expression: 3.04≤100*ΣCT / FOV≤4.93. When the above conditional expression is satisfied, the large field of view and the thickness of each lens in the optical system 100 on the optical axis can be better balanced.

[0079] In some embodiments, the optical system 100 satisfies the conditional formula: 0≤(CT7+CT8) / CT6≤2; wherein CT6 is the thickness of the sixth lens L6 on the optical axis, CT7 is the thickness of the seventh lens L7 on the optical axis, and CT8 is the thickness of the eighth lens L8 on the optical axis. Specifically, (CT7+CT8) / CT6 can be: 0.883, 0.935, 1.028, 1.136, 1.298, 1.374, 1.432, 1.521, 1.693 or 1.707. When the above conditional formula is satisfied, the thicknesses of the sixth lens L6, the seventh lens L7 and the eighth lens L8 on the optical axis can be reasonably configured to balance the wide-angle characteristics and aberrations of the optical system 100, so that the optical system 100 has a large field of view while the aberrations are not too large, thereby ensuring that the optical system 100 has excellent imaging quality. Furthermore, in some embodiments, the optical system 100 satisfies the conditional expression: 0.88≤(CT7+CT8) / CT6≤1.71. When the above conditional expression is satisfied, the large field of view and aberration of the optical system 100 can be better balanced.

[0080] In some embodiments, the optical system 100 satisfies the conditional formula: (ET2+ET3) / (CT2+CT3)≤1; wherein ET2 is the distance from the maximum effective aperture of the object side surface S3 of the second lens L2 to the maximum effective aperture of the image side surface S4 of the second lens L2 in a direction parallel to the optical axis, ET3 is the distance from the maximum effective aperture of the object side surface S5 of the third lens L3 to the maximum effective aperture of the image side surface S6 of the third lens in a direction parallel to the optical axis, CT2 is the thickness of the second lens L2 at the optical axis, and CT3 is the thickness of the third lens L3 at the optical axis. Specifically, (ET2+ET3) / (CT2+CT3) can be: 0.831, 0.845, 0.856, 0.869, 0.872, 0.883, 0.895, 0.918, 0.925 or 0.938. When the above conditional formula is satisfied, the thickness of the second lens L2 and the third lens L3 can be reasonably configured, which is conducive to achieving a large field of view. At the same time, the deflection angle of the light passing through the second lens L2 and the third lens L3 can be made smaller, so as to reduce the generation of stray light in the optical system 100 and improve the imaging quality of the optical system 100. In addition, the sensitivity of the second lens L2 and the third lens L3 can also be reduced, which is beneficial to the injection molding and assembly of the second lens L2 and the third lens L3, and improves the injection molding yield of the second lens L2 and the third lens L3, so as to reduce the production cost of the second lens L2 and the third lens L3. Further, in some embodiments, the optical system 100 satisfies the conditional formula: 0.83≤(ET2+ET3) / (CT2+CT3)≤0.94. When the above conditional formula is met, the large field of view effect and imaging quality of the optical system 100 are better, and the injection molding yield of the second lens L2 and the third lens L3 is also higher.

[0081] In some embodiments, the optical system 100 satisfies the conditional formula: 1≤TTL / f≤2; wherein TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface of the optical system 100 on the optical axis, and f is the total effective focal length of the optical system 100. Specifically, TTL / f can be: 1.312, 1.335, 1.357, 1.369, 1.387, 1.401, 1.425, 1.453, 1.462 or 1.478. When the above conditional formula is satisfied, the total system length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the total system length of the optical system 100 and achieve a miniaturized design. Further, in some embodiments, the optical system 100 satisfies the conditional formula: 1.31≤TTL / f≤1.48. When the above conditional formula is satisfied, the optical system 100 is more easily miniaturized.

[0082] In some embodiments, the optical system 100 satisfies the conditional formula: 1≤TTL / ImgH≤2; wherein TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface of the optical system 100 on the optical axis, and ImgH is half of the diagonal length of the effective pixel area of ​​the optical system 100 on the imaging surface. Specifically, TTL / ImgH can be: 1.223, 1.253, 1.268, 1.295, 1.311, 1.375, 1.426, 1.487, 1.510 or 1.558. When the above conditional formula is met, it is beneficial to shorten the total system length of the optical system 100 to achieve a miniaturized design. Further, in some embodiments, the optical system 100 satisfies the conditional formula: 1.22≤TTL / ImgH≤1.56. When the above conditional formula is met, the optical system 100 is more easily miniaturized.

[0083] In some embodiments, the optical system 100 satisfies the conditional formula: -10≤f67 / f≤3; wherein f67 is the combined focal length of the sixth lens L6 and the seventh lens L7, and f is the total effective focal length of the optical system 100. Specifically, f67 / f can be: -9.584, -8.102, -6.564, -2.398, -0.325, 1.092, 1.157, 1.253, 1.374 or 1.401. When the above conditional formula is satisfied, the combined focal length of the sixth lens L6 and the seventh lens L7 and the total effective focal length of the optical system 100 can be reasonably configured to facilitate correction of the spherical aberration generated by the off-axis light of the optical system 100 at different aperture positions, thereby improving the imaging quality of the optical system 100. Further, in some embodiments, the optical system 100 satisfies the conditional formula: -9.58≤f67 / f≤1.4. When the above conditional expression is satisfied, the imaging quality of the optical system 100 is better.

[0084] In some embodiments, the optical system 100 satisfies the conditional formula: -23≤f4 / f≤24; wherein f4 is the effective focal length of the fourth lens L4, and f is the total effective focal length of the optical system 100. Specifically, f4 / f can be: -22.380, -20.528, -18.012, -15.320, -5.693, 0.368, 5.369, 10.471, 15.678 or 23.416. When the above conditional formula is satisfied, the effective focal length of the fourth lens L4 and the total effective focal length of the optical system 100 can be reasonably configured to expand the maximum field of view of the optical system 100 and achieve a large field of view, while also facilitating shortening the total length of the optical system 100 and achieving a miniaturized design. Further, in some embodiments, the optical system 100 satisfies the conditional formula: -22.38≤f4 / f≤23.42. When the above conditional expressions are met, the optical system 100 can more easily achieve a large field of view and a compact design.

[0085] Furthermore, in some embodiments, the optical system 100 satisfies the conditional formula: 3.43≤f≤4.75; 2.02≤FNO≤2.48; 78.36≤FOV≤97.5; ImgH=4.00; 4.89≤TTL≤6.23; wherein, f is the total effective focal length of the optical system 100, in mm; FNO is the aperture number of the optical system 100; FOV is the maximum field of view of the optical system 100, in degrees; ImgH is half of the diagonal length of the effective pixel area of ​​the optical system 100 on the imaging plane, in mm; TTL is the distance from the object side surface S1 of the first lens L1 to the imaging plane of the optical system 100 on the optical axis, in mm.

[0086] Based on the description of the above embodiments, more specific embodiments and drawings are presented below for detailed description.

[0087] First embodiment

[0088] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the optical system 100 in the first embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, and an eighth lens L8 with negative refractive power. Figure 2 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, wherein the astigmatism graph and the distortion graph are both graphs at 555 nm, which are the same for other embodiments.

[0089] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0090] The image side surface S2 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0091] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0092] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0093] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0094] The image side surface S6 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0095] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0096] The image side surface S8 of the fourth lens L4 is concave at the paraxial position and convex at the circumference;

[0097] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0098] The image-side surface S10 of the fifth lens L5 is convex at the paraxial position and is convex at the circumference;

[0099] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0100] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0101] The object-side surface S13 of the seventh lens L7 is concave at the paraxial position and is concave at the circumference;

[0102] The image-side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference;

[0103] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and is convex at the circumference;

[0104] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0105] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0106] It should be noted that in the present application, when a surface of a lens is described as convex at the near axis (the central area of ​​the side), it can be understood that the area of ​​the surface of the lens near the optical axis is convex. When a surface of a lens is described as concave at the circumference, it can be understood that the area of ​​the surface close to the maximum effective radius is concave. For example, when the surface is convex at the optical axis and also convex at the circumference, the shape of the surface from the center (optical axis) to the edge can be purely convex; or it first transitions from a convex shape at the center to a concave shape, and then becomes convex when close to the maximum effective radius. This is only an example made to illustrate the relationship between the optical axis and the circumference, and the various shape structures (convex-concave relationship) of the surface are not fully reflected, but other situations can be derived based on the above examples.

[0107] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0108] Furthermore, the optical system 100 satisfies the conditional formula: (MIN6*MAX8 / MAX6*MIN8)=1.402; wherein MIN6 is the minimum thickness of the sixth lens L6 in the direction parallel to the optical axis, MAX6 is the maximum thickness of the sixth lens L6 in the direction parallel to the optical axis, MIN8 is the minimum thickness of the eighth lens L8 in the direction parallel to the optical axis, and MAX8 is the maximum thickness of the eighth lens L8 in the direction parallel to the optical axis. When the above conditional formula is satisfied, the thickness of the sixth lens L6 and the eighth lens L8 can be reasonably configured to balance the wide-angle characteristic and the astigmatism, so that the optical system 100 has a large field of view while the astigmatism is not too large, thereby ensuring that the optical system 100 has excellent imaging quality. In addition, the injection molding yield of the sixth lens L6 and the eighth lens L8 in the production process can be improved, thereby reducing the production cost.

[0109] The optical system 100 satisfies the conditional formula: (SAG61+SAG62) / (SAG71+SAG72)=0.852; wherein, SAG61 is a distance from an intersection of the object-side surface S11 of the sixth lens L6 and the optical axis to a position of a maximum effective radius of the object-side surface S11 of the sixth lens L6 in a direction parallel to the optical axis, SAG62 is a distance from an intersection of the image-side surface S12 of the sixth lens L6 and the optical axis to a position of a maximum effective radius of the image-side surface S12 of the sixth lens L6 in a direction parallel to the optical axis, SAG71 is a distance from an intersection of the object-side surface S13 of the seventh lens L7 and the optical axis to a position of a maximum effective radius of the object-side surface S13 of the seventh lens L7 in a direction parallel to the optical axis, and SAG72 is a distance from an intersection of the image-side surface S14 of the seventh lens L7 and the optical axis to a position of a maximum effective radius of the image-side surface S14 of the seventh lens L7 in a direction parallel to the optical axis. When the above conditional expressions are met, the sixth lens L6 and the seventh lens L7 can be reasonably configured to reduce the tolerances of the sixth lens L6 and the seventh lens L7 during the injection molding process, and the tolerances of the lens barrel during the molding process, which affect the imaging quality of the optical system 100 during assembly. At the same time, it is also beneficial to balance the wide-angle characteristics and distortion of the optical system 100, so that the optical system 100 has a large field of view while the distortion is not too large, thereby ensuring that the optical system 100 has excellent imaging quality.

[0110] The optical system 100 satisfies the conditional formula: Y71-Y62=0.303; wherein Y62 is the maximum effective aperture of the image side surface S12 of the sixth lens L6, and Y71 is the maximum effective aperture of the object side surface S13 of the seventh lens L7. When the above conditional formula is satisfied, the sixth lens L6 and the seventh lens L7 can be reasonably configured to make the structure of the optical system 100 more compact to meet the requirements of miniaturized design, while making the optical system 100 have a larger field of view. In addition, the structure of the optical system 100 is more compact, and the air gap between the sixth lens L6 and the seventh lens L7 at the edge can be shorter, thereby eliminating the need for the pressing plate between the sixth lens L5 and the seventh lens L7, thereby reducing the generation of stray light and improving the imaging quality of the optical system 100.

[0111] The optical system 100 satisfies the conditional formula: 100*ΣCT / FOV=4.555; wherein ΣCT is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 on the optical axis, and FOV is the maximum field of view of the optical system 100. When the above conditional formula is satisfied, the wide-angle characteristic and the thickness of each lens on the optical axis of the optical system 100 can be balanced, so that the optical system 100 has a large field of view and a short total system length.

[0112] The optical system 100 satisfies the conditional formula: (CT7+CT8) / CT6=1.707; wherein CT6 is the thickness of the sixth lens L6 on the optical axis, CT7 is the thickness of the seventh lens L7 on the optical axis, and CT8 is the thickness of the eighth lens L8 on the optical axis. When the above conditional formula is satisfied, the thicknesses of the sixth lens L6, the seventh lens L7, and the eighth lens L8 on the optical axis can be reasonably configured to balance the wide-angle characteristics and aberrations of the optical system 100, so that the optical system 100 has a large field of view while the aberrations are not too large, thereby ensuring that the optical system 100 has excellent imaging quality.

[0113] The optical system 100 satisfies the conditional formula: (ET2+ET3) / (CT2+CT3)=0.831; wherein ET2 is the distance from the maximum effective aperture of the object side surface S3 of the second lens L2 to the maximum effective aperture of the image side surface S4 of the second lens L2 in a direction parallel to the optical axis, ET3 is the distance from the maximum effective aperture of the object side surface S5 of the third lens L3 to the maximum effective aperture of the image side surface S6 of the third lens L3 in a direction parallel to the optical axis, CT2 is the thickness of the second lens L2 at the optical axis, and CT3 is the thickness of the third lens L3 at the optical axis. When the above conditional formula is satisfied, the thickness of the second lens L2 and the third lens L3 can be reasonably configured, which is conducive to achieving a large field of view. At the same time, the light deflection angle passing through the second lens L2 and the third lens L3 can be made smaller, so as to reduce the generation of stray light in the optical system 100 and improve the imaging quality of the optical system 100. In addition, the sensitivity of the second lens L2 and the third lens L3 can also be reduced, which is beneficial to the injection molding and assembly of the second lens L2 and the third lens L3, and improves the injection molding yield of the second lens L2 and the third lens L3, so as to reduce the production cost of the second lens L2 and the third lens L3.

[0114] The optical system 100 satisfies the conditional expression: TTL / f=1.353, wherein TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface of the optical system 100, and f is the total effective focal length of the optical system 100. When the above conditional expression is satisfied, the total system length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the total system length of the optical system 100 and achieve a miniaturized design.

[0115] The optical system 100 satisfies the conditional expression: TTL / ImgH=1.475; wherein TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface of the optical system 100, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical system 100. When the above conditional expression is satisfied, it is beneficial to shorten the total length of the optical system 100 to achieve a miniaturized design.

[0116] The optical system 100 satisfies the conditional expression: f67 / f=1.352; wherein f67 is the combined focal length of the sixth lens L6 and the seventh lens L7, and f is the total effective focal length of the optical system 100. When the above conditional expression is satisfied, the combined focal length of the sixth lens L6 and the seventh lens L7 and the total effective focal length of the optical system 100 can be reasonably configured, so as to correct the spherical aberration generated by the off-axis light at different aperture positions of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0117] The optical system 100 satisfies the conditional expression: f4 / f=-3.456, wherein f4 is the effective focal length of the fourth lens L4, and f is the total effective focal length of the optical system 100. When the above conditional expression is satisfied, the effective focal length of the fourth lens L4 and the total effective focal length of the optical system 100 can be reasonably configured to expand the maximum field angle of the optical system 100 and achieve a large field effect, while being conducive to shortening the total length of the optical system 100 and achieving a miniaturized design.

[0118] In addition, various parameters of the optical system 100 are given in Table 1. Among them, the image plane S19 in Table 1 can be understood as the imaging plane of the optical system 100. The elements from the object plane (not shown) to the image plane S19 are arranged in the order of the elements from top to bottom in Table 1. The Y radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis. Surface number 1 and surface number 2 are the object side surface S1 and image side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with a smaller surface number is the object side surface, and the surface with a larger surface number is the image side surface. The first value in the "Thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens in the image side direction on the optical axis.

[0119] It should be noted that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L9, but in this case the distance from the image side surface S16 to the image surface S19 of the eighth lens L8 remains unchanged.

[0120] In the first embodiment, the total effective focal length f of the optical system 100 is 4.36 mm, the aperture number FNO is 2.36, and the maximum field of view FOV is 83.2°.

[0121] The focal length, refractive index and Abbe number of each lens are values ​​at a wavelength of 555 nm, and the same applies to other embodiments.

[0122] Table 1

[0123]

[0124]

[0125] Furthermore, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 2. Among them, the surface numbers from 1 to 16 represent the image side or object side S1 to S16 respectively. And K-A20 from top to bottom represent the types of aspheric coefficients respectively, among which K represents the cone coefficient, A4 represents the fourth-order aspheric coefficient, A6 represents the sixth-order aspheric coefficient, A8 represents the eighth-order aspheric coefficient, and so on. In addition, the formula of the aspheric coefficient is as follows:

[0126]

[0127] Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula.

[0128] Table 2

[0129]

[0130]

[0131] Second embodiment

[0132] See also Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the optical system 100 in the second embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative refractive power, and an eighth lens L8 with negative refractive power. Figure 4 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment.

[0133] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0134] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0135] The object side surface S3 of the second lens L2 is concave at the paraxial position and convex at the circumference;

[0136] The image side surface S4 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0137] The object side surface S5 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0138] The image side surface S6 of the third lens L3 is concave at the paraxial position and concave at the circumference;

[0139] The object side surface S7 of the fourth lens L4 is convex at the paraxial position and concave at the circumference;

[0140] The image side surface S8 of the fourth lens L4 is concave at the paraxial position and convex at the circumference;

[0141] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0142] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0143] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0144] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0145] The object-side surface S13 of the seventh lens L7 is concave at the paraxial position and is concave at the circumference;

[0146] The image-side surface S14 of the seventh lens L7 is convex at the paraxial position and concave at the circumference;

[0147] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and is convex at the circumference;

[0148] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0149] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0150] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0151] In addition, various parameters of the optical system 100 are given in Table 3, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0152] Table 3

[0153]

[0154] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 4, and the definition of each parameter therein can be obtained from the first embodiment, which will not be elaborated here.

[0155] Table 4

[0156]

[0157]

[0158] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0159] (MIN6*MAX8 / MAX6*MIN8)=1.284; (SAG61+SAG62) / (SAG71+SAG72)=0.498;

[0160] Y71-Y62=0.101; 100*ΣCT / FOV=4.183; (CT7+CT8) / CT6=1.054;

[0161] (ET2+ET3) / (CT2+CT3)=0.928; TTL / f=1.333; TTL / ImgH=1.463;

[0162] f67 / f=1.156; f4 / f=20.477.

[0163] Third embodiment

[0164] See also Figure 5 and Figure 6 , Figure 5 is a schematic diagram of the optical system 100 in the third embodiment. The optical system 100 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 negative refractive power and an eighth lens L8 with negative refractive power. Figure 6 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment.

[0165] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0166] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0167] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0168] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0169] The object side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference;

[0170] The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

[0171] The object side surface S7 of the fourth lens L4 is convex at the paraxial position and concave at the circumference;

[0172] The image side surface S8 of the fourth lens L4 is concave at the paraxial position and convex at the circumference;

[0173] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0174] The image-side surface S10 of the fifth lens L5 is convex at the paraxial position and is convex at the circumference;

[0175] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0176] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0177] The object-side surface S13 of the seventh lens L7 is concave at the paraxial position and is concave at the circumference;

[0178] The image-side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference;

[0179] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and concave at the circumference;

[0180] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0181] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0182] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0183] In addition, various parameters of the optical system 100 are given in Table 5, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0184] Table 5

[0185]

[0186] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 6, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0187] Table 6

[0188]

[0189]

[0190] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0191] (MIN6*MAX8 / MAX6*MIN8)=1.437; (SAG61+SAG62) / (SAG71+SAG72)=0.631;

[0192] Y71-Y62=0.431; 100*ΣCT / FOV=3.042; (CT7+CT8) / CT6=0.883;

[0193] (ET2+ET3) / (CT2+CT3)=0.924; TTL / f=1.362; TTL / ImgH=1.223;

[0194] f67 / f=1.401; f4 / f=23.416.

[0195] Fourth embodiment

[0196] See also Figure 7 and Figure 8 , Figure 7 is a schematic diagram of the optical system 100 in the fourth embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an eighth lens L8 with negative refractive power. Figure 8 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment.

[0197] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0198] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0199] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0200] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0201] The object side surface S5 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0202] The image side surface S6 of the third lens L3 is concave at the paraxial position and concave at the circumference;

[0203] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0204] The image side surface S8 of the fourth lens L4 is concave at the paraxial position and convex at the circumference;

[0205] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0206] The image-side surface S10 of the fifth lens L5 is convex at the paraxial position and is convex at the circumference;

[0207] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0208] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0209] The object-side surface S13 of the seventh lens L7 is concave at the paraxial position and is concave at the circumference;

[0210] The image-side surface S14 of the seventh lens L7 is convex at the paraxial position and is convex at the circumference;

[0211] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and concave at the circumference;

[0212] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0213] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0214] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0215] In addition, various parameters of the optical system 100 are given in Table 7, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0216] Table 7

[0217]

[0218] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 8, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0219] Table 8

[0220]

[0221]

[0222] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0223] (MIN6*MAX8 / MAX6*MIN8)=1.414; (SAG61+SAG62) / (SAG71+SAG72)=0.899;

[0224] Y71-Y62=0.363; 100*ΣCT / FOV=4.813; (CT7+CT8) / CT6=1.195;

[0225] (ET2+ET3) / (CT2+CT3)=0.871; TTL / f=1.320; TTL / ImgH=1.538;

[0226] f67 / f=1.355; f4 / f=-3.332.

[0227] Fifth embodiment

[0228] See also Fig. 9 and Fig.10 , Fig. 9 is a schematic diagram of the optical system 100 in the fifth embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative 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, and an eighth lens L8 with negative refractive power. Fig.10 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment.

[0229] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0230] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0231] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0232] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0233] The object side surface S5 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0234] The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

[0235] The object side surface S7 of the fourth lens L4 is convex at the paraxial position and concave at the circumference;

[0236] The image side surface S8 of the fourth lens L4 is concave at the paraxial position and convex at the circumference;

[0237] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0238] The image-side surface S10 of the fifth lens L5 is convex at the paraxial position and is convex at the circumference;

[0239] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0240] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0241] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position and concave at the circumference;

[0242] The image-side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference;

[0243] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and is convex at the circumference;

[0244] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0245] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0246] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0247] In addition, various parameters of the optical system 100 are given in Table 9, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0248] Table 9

[0249]

[0250] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 10, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0251] Table 10

[0252]

[0253]

[0254] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0255] (MIN6*MAX8 / MAX6*MIN8)=1.337; (SAG61+SAG62) / (SAG71+SAG72)=1.243;

[0256] Y71-Y62=0.512; 100*ΣCT / FOV=3.218; (CT7+CT8) / CT6=1.098;

[0257] (ET2+ET3) / (CT2+CT3)=0.938; TTL / f=1.478; TTL / ImgH=1.268;

[0258] f67 / f=1.108; f4 / f=-10.788.

[0259] Sixth embodiment

[0260] See also Fig.11 and Fig.12 , Fig.11 is a schematic diagram of the optical system 100 in the sixth embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an eighth lens L8 with positive refractive power. Fig.12 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the sixth embodiment.

[0261] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0262] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0263] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0264] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0265] The object side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference;

[0266] The image side surface S6 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0267] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0268] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0269] The object side surface S9 of the fifth lens L5 is concave at the paraxial position and is concave at the circumference;

[0270] The image-side surface S10 of the fifth lens L5 is convex at the paraxial position and is convex at the circumference;

[0271] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0272] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0273] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position and concave at the circumference;

[0274] The image-side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference;

[0275] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position and is convex at the circumference;

[0276] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0277] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0278] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0279] In addition, various parameters of the optical system 100 are given in Table 11, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0280] Table 11

[0281]

[0282] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 12, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0283] Table 12

[0284]

[0285]

[0286] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0287] (MIN6*MAX8 / MAX6*MIN8)=0.810; (SAG61+SAG62) / (SAG71+SAG72)=0.734;

[0288] Y71-Y62=0.361; 100*ΣCT / FOV=4.926; (CT7+CT8) / CT6=1.461;

[0289] (ET2+ET3) / (CT2+CT3)=0.914; TTL / f=1.312; TTL / ImgH=1.558;

[0290] f67 / f=-9.584; f4 / f=-22.380.

[0291] Seventh embodiment

[0292] See also Fig.13 and Fig.14 , Fig.13 is a schematic diagram of the optical system 100 in the seventh embodiment. The optical system 100 includes, from the object side to the image side, an aperture stop 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 negative refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an eighth lens L8 with negative refractive power. Fig.14 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the seventh embodiment.

[0293] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0294] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0295] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0296] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0297] The object side surface S5 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0298] The image side surface S6 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0299] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0300] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0301] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0302] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0303] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position and is concave at the circumference;

[0304] The image side surface S12 of the sixth lens L6 is convex at the paraxial position and is convex at the circumference;

[0305] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position and concave at the circumference;

[0306] The image-side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference;

[0307] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position and convex at the circumference;

[0308] The image-side surface S16 of the eighth lens L8 is concave at the paraxial position and is convex at the circumference.

[0309] The object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all aspherical surfaces.

[0310] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0311] In addition, various parameters of the optical system 100 are given in Table 13, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

[0312] Table 13

[0313]

[0314] Furthermore, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given in Table 14, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0315] Table 14

[0316]

[0317]

[0318] Furthermore, based on the parameter information provided above, the following relationship can be derived:

[0319] (MIN6*MAX8 / MAX6*MIN8)=1.573; (SAG61+SAG62) / (SAG71+SAG72)=0.674;

[0320] Y71-Y62=0.141; 100*ΣCT / FOV=4.441; (CT7+CT8) / CT6=1.453;

[0321] (ET2+ET3) / (CT2+CT3)=0.846; TTL / f=1.333; TTL / ImgH=1.500;

[0322] f67 / f=1.161; f4 / f=-2.147.

[0323] See also Fig.15In some embodiments, the optical system 100 can be assembled with the photosensitive element 210 to form the imaging module 200. At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the image surface S19 of the optical system 100. The imaging module 200 can also be provided with an infrared filter L9, and the infrared filter L9 is arranged between the image side surface S16 of the eighth lens L8 and the image surface S19. Specifically, the photosensitive element 210 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS Sensor). The above optical system 100 is used in the imaging module 200, and by balancing the wide-angle characteristics and astigmatism of the optical system 100, it is ensured that the imaging module 200 has a large field of view while the astigmatism is not too large, thereby ensuring that the imaging module 200 has excellent imaging quality.

[0324] See also Fig.15 and Fig.16 In some embodiments, the imaging module 200 can be used in an electronic device 300, and the electronic device includes a housing 310, and the imaging module 200 is disposed in the housing 310. Specifically, the electronic device 300 can be, but is not limited to, a portable phone, a video phone, a smart phone, an e-book reader, a driving recorder, or other vehicle-mounted imaging devices or a wearable device such as a smart watch. The imaging module 200 is used in the electronic device 300, so that the electronic device 300 has a large field of view and the astigmatism is not too large, thereby ensuring that the electronic device 300 has excellent imaging quality.

[0325] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0326] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical system, characterized in that: The optical system has a total of eight lenses, which include: Aperture; A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the paraxial position; a second lens having refractive power; a third lens having refractive power; a fourth lens having a refractive power; a fifth lens having refractive power; a sixth lens having positive refractive power, wherein the image side surface of the sixth lens is convex at the paraxial position; a seventh lens having refractive power; an eighth lens having refractive power, wherein the image side surface of the eighth lens is concave at the paraxial position; And the optical system satisfies the following conditional formula: 0.81≤(MIN6 MAX8) / (MAX6 MIN8)≤2; Specifically, within the maximum effective aperture of the sixth lens, MIN6 is the minimum thickness of the sixth lens in a direction parallel to the optical axis, and MAX6 is the maximum thickness of the sixth lens in a direction parallel to the optical axis; within the maximum effective aperture of the eighth lens, MIN8 is the minimum thickness of the eighth lens in a direction parallel to the optical axis, and MAX8 is the maximum thickness of the eighth lens in a direction parallel to the optical axis.

2. The optical system according to claim 1, characterized in that The following conditions are met: 0.498≤(SAG61+SAG62) / (SAG71+SAG72)≤2; Among them, SAG61 is the distance from the intersection of the object side surface of the sixth lens and the optical axis to the maximum effective radius position of the object side surface of the sixth lens in a direction parallel to the optical axis, SAG62 is the distance from the intersection of the image side surface of the sixth lens and the optical axis to the maximum effective radius position of the image side surface of the sixth lens in a direction parallel to the optical axis, SAG71 is the distance from the intersection of the object side surface of the seventh lens and the optical axis to the maximum effective radius position of the object side surface of the seventh lens in a direction parallel to the optical axis, and SAG72 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective radius position of the image side surface of the seventh lens in a direction parallel to the optical axis.

3. The optical system according to claim 1, characterized in that The following conditions are met: 0.1≤Y71-Y62≤1mm; Among them, Y62 is the maximum effective aperture of the image side of the sixth lens, and Y71 is the maximum effective aperture of the object side of the seventh lens.

4. The optical system according to claim 1, characterized in that The following conditions are met: 3mm / degree≤100 ΣCT / FOV≤5mm / degree; Wherein, ΣCT is the sum of the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens on the optical axis, and FOV is the maximum field of view of the optical system.

5. The optical system according to claim 1, characterized in that The following conditions are met: 0.88≤(CT7+CT8) / CT6≤2; Wherein, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis.

6. The optical system according to claim 1, characterized in that The following conditions are met: 0.83≤(ET2+ET3) / (CT2+CT3)≤1; Among them, ET2 is the distance from the maximum effective aperture of the object side of the second lens to the maximum effective aperture of the image side of the second lens in a direction parallel to the optical axis, ET3 is the distance from the maximum effective aperture of the object side of the third lens to the maximum effective aperture of the image side of the third lens in a direction parallel to the optical axis, CT2 is the thickness of the second lens at the optical axis, and CT3 is the thickness of the third lens at the optical axis.

7. The optical system according to claim 1, characterized in that The following conditions are met: 1.31≤TTL / f≤2; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, and f is the total effective focal length of the optical system.

8. The optical system according to claim 1, characterized in that The following conditions are met: 1≤TTL / ImgH≤1.56; Wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and ImgH is half of the diagonal length of the effective pixel area of ​​the optical system on the imaging plane.

9. The optical system according to claim 1, characterized in that The following conditions are met: -10≤f67 / f≤3; Wherein, f67 is the combined focal length of the sixth lens and the seventh lens, and f is the total effective focal length of the optical system.

10. The optical system according to claim 1, characterized in that The following conditions are met: -23≤f4 / f≤24; Wherein, f4 is the effective focal length of the fourth lens, and f is the total effective focal length of the optical system.

11. The optical system according to claim 1, characterized in that The following conditions are met: 2.02≤FNO≤2.48; Wherein, FNO is the aperture number of the optical system.

12. The optical system according to claim 1, characterized in that The following conditions are met: 78.36 degrees ≤ FOV ≤ 97.5 degrees; Wherein, FOV is the maximum field of view of the optical system.

13. An imaging module, characterized in that: It comprises a photosensitive element and the optical system according to any one of claims 1 to 12, wherein the photosensitive element is arranged on the image side of the optical system, and light forms an image on the photosensitive element after passing through the optical system.

14. An electronic device, characterized in that: It comprises a shell and the imaging module as claimed in claim 13, wherein the imaging module is arranged in the shell.

Images