Optical System, Imaging Module and Electronic Device

Abstract

The present invention relates to an optical system, an imaging module, and an electronic device. The optical system sequentially includes, from the object side to the image side, a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a negative refractive power, with both the object side surface and the image side surface being concave at the circumference; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power, with both the object side surface and the image side surface being aspherical, and at least one of the object side surface and the image side surface having an inflection point; and a sixth lens having a negative refractive power. The optical system satisfies: 0.60 < CT1 / SD11 < 1.01; 5.5 < TTL / CT1 < 9.0; CT1 is the thickness of the first lens on the optical axis, SD11 is half of the maximum effective aperture of the object side surface of the first lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system. The above optical system can make the head of the camera lens smaller, meeting the requirements of the miniaturization design of the electronic device.

Description

Technical Field

[0001] The present invention relates to the field of imaging, and particularly to an optical system, an imaging module, and an electronic device. Background Art

[0002] With the continuous development of electronic devices such as smart phones and tablet computers, the imaging function has become an indispensable function in electronic devices. Moreover, as the volume of electronic devices is increasingly tending to be miniaturized, higher requirements are also put forward for the size of the optical system inside the electronic device. However, currently, the head of the imaging lens is usually large, making it difficult to meet the requirements of the miniaturized design of electronic devices. Summary of the Invention

[0003] Based on this, in view of the problem that the head of the imaging lens is large and it is difficult to meet the requirements of the miniaturized design of electronic devices, it is necessary to provide an optical system, an imaging module, and an electronic device.

[0004] An optical system sequentially includes, from the object side to the image side:

[0005] A first lens with positive refractive power;

[0006] A second lens with refractive power;

[0007] A third lens with negative refractive power, wherein the object side surface and the image side surface of the third lens are concave surfaces at the circumference;

[0008] A fourth lens with negative refractive power;

[0009] A fifth lens with positive refractive power, and at least one of the object side surface and the image side surface of the fifth lens has an inflection point;

[0010] A sixth lens with negative refractive power;

[0011] And the optical system satisfies the following relational expressions:

[0012] 0.60 < CT1 / SD11 < 1.01;

[0013] 5.5 < TTL / CT1 < 9.0;

[0014] Wherein, CT1 is the thickness of the first lens on the optical axis, SD11 is half of the maximum effective aperture of the object side surface of the first lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system.

[0015] For the above optical system, when the relational expression 0.60 < CT1 / SD11 < 1.01 is satisfied, the first lens can be reasonably arranged, so that the head of the camera lens is smaller, meeting the requirements of the miniaturization design of the electronic device. When the relational expression 5.5 < TTL / CT1 < 9.0 is satisfied, the first lens and the overall length of the optical system can be reasonably arranged. While ensuring that the head of the camera lens is smaller, the overall length of the optical system can be made smaller, further meeting the needs of the miniaturization design of the electronic device. At the same time, it can also ensure that the first lens has sufficient thickness, so that the processing and forming yield of the first lens is higher, thereby improving the assembly yield of the optical system.

[0016] In one embodiment, the optical system satisfies the following relational expressions:

[0017] 2.2 ≤ FNO ≤ 2.6;

[0018] Wherein, FNO is the aperture number of the optical system. When the above relational expressions are satisfied, while ensuring that the optical system has sufficient light transmission, it is also beneficial to make the head of the camera lens smaller.

[0019] In one embodiment, the optical system satisfies the following relational expressions:

[0020] 1 < f3 / f4 < 10;

[0021] Wherein, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. When the above relational expressions are satisfied, the third lens and the fourth lens can be reasonably arranged to effectively expand the field of view angle of the optical system, thereby reducing the overall length of the optical system and meeting the requirements of the miniaturization design.

[0022] In one embodiment, the optical system satisfies the following relational expressions:

[0023] -2.0 > f4 / f1 + f5 / f6 > -4.0;

[0024] Wherein, f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens; f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. When the above relational expressions are satisfied, the refractive powers of the first lens, the fourth lens, the fifth lens, and the sixth lens can be reasonably arranged to ensure that the positive and negative spherical aberrations of the optical system can be balanced with each other, thereby improving the imaging quality of the optical system.

[0025] In one embodiment, the optical system satisfies the following relational expressions:

[0026] 1.0 < f / f12 < 1.5;

[0027] Wherein, f is the total effective focal length of the optical system, and f12 is the combined focal length of the first lens and the second lens. When the above relationship is satisfied, the effective focal length of the optical system and the combined focal length of the first lens and the second lens can be reasonably configured to effectively shorten the overall length of the optical system, and at the same time, the high-order spherical aberration of the optical system can be prevented from increasing excessively, thereby improving the imaging quality of the optical system.

[0028] In one embodiment, the optical system satisfies the following relationship:

[0029] TT / ImgH < 1.1;

[0030] Wherein, TT is the distance from the object side of the first lens to the image side of the sixth lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the optical system. When the above relationship is satisfied, the imaging quality of the optical system on the imaging surface can be improved, and at the same time, the overall length of the optical system can be effectively shortened, further meeting the requirements of the miniaturized design of the lens.

[0031] In one embodiment, the optical system satisfies the following relationship:

[0032] -1.5 < R9 / R10 < 0;

[0033] Wherein, R9 is the curvature radius of the object side of the fifth lens on the optical axis, and R10 is the curvature radius of the image side of the fifth lens on the optical axis. When the above relationship is satisfied, the relationship between the object side and the image side of the fifth lens can be reasonably constrained, thereby reasonably distributing the deflection angle of the optical system, and at the same time, the astigmatism of the off-axis field of view of the optical system can be improved, thereby improving the imaging quality of the optical system.

[0034] In one embodiment, the optical system satisfies the following relationship:

[0035] 1 < |f6| / R12 < 2;

[0036] Wherein, f6 is the effective focal length of the sixth lens, and R12 is the curvature radius of the image side of the sixth lens on the optical axis. When the above relationship is satisfied, the effective focal length and the image side of the sixth lens can be reasonably configured to reduce the incident angle of light reaching the imaging surface of the optical system, thereby making it easier for the optical system to match with the photosensitive element.

[0037] In one embodiment, the optical system satisfies the following relationship:

[0038] 1.0 < CT5 / |SAG51| < 5.0;

[0039] Wherein, CT5 is the thickness of the fifth lens on the optical axis, and SAG51 is the sag of the object side surface of the fifth lens. When the above relational expression is satisfied, the fifth lens can be reasonably arranged, making the surface shape of the fifth lens more reasonable, so as to reduce the defective rate of the processing and forming of the fifth lens. At the same time, the aberration generated by the optical system can be corrected, further improving the imaging quality of the optical system.

[0040] An imaging module includes a photosensitive element and the optical system according to any one of the above embodiments, and the photosensitive element is disposed on the image side of the optical system. By adopting the above optical system in the imaging module, the head of the imaging lens is smaller, which can meet the requirements of the miniaturized design of the electronic device.

[0041] An electronic device includes a housing and the above imaging module, and the imaging module is mounted on the housing. By adopting the above imaging module in the electronic device, the head of the lens in the electronic device is smaller, which can meet the requirements of the miniaturized design of the electronic device. Description of the Drawings

[0042] Figure 1 It is a schematic diagram of the optical system in the first embodiment of the present application;

[0043] Figure 2 It is the spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the first embodiment of the present application;

[0044] Figure 3 It is a schematic diagram of the optical system in the second embodiment of the present application;

[0045] Figure 4 It is the spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the second embodiment of the present application;

[0046] Figure 5 It is a schematic diagram of the optical system in the third embodiment of the present application;

[0047] Figure 6 It is the spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the third embodiment of the present application;

[0048] Figure 7 It is a schematic diagram of the optical system in the fourth embodiment of the present application;

[0049] Figure 8 It is the spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fourth embodiment of the present application;

[0050] Figure 9 It is a schematic diagram of the optical system in the fifth embodiment of the present application;

[0051] Figure 10 Spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment of the present application;

[0052] Figure 11 Schematic diagram of the optical system in the sixth embodiment of the present application;

[0053] Figure 12 Spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the sixth embodiment of the present application;

[0054] Figure 13 Schematic diagram of the imaging module in an embodiment of the present application;

[0055] Figure 14 Schematic diagram of the electronic device in an embodiment of the present application. Detailed implementation manners

[0056] For ease of understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0057] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "inner", "outer", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0058] Please refer to Figure 1 , in some embodiments of the present application, the optical system 100 sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 from the object side to the image side. 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, and the sixth lens L6 includes an object side surface S11 and an image side surface S12.

[0059] Among them, the first lens L1 has a positive refractive power, and the second lens L2 has a refractive power. The third lens L3 has a negative refractive power, and both the object side surface S5 and the image side surface S6 of the third lens L3 are concave surfaces at the circumference. The fourth lens L4 has a negative refractive power. The fifth lens L5 has a positive refractive power, and at least one of the object side surface S9 and the image side surface S10 of the fifth lens L5 has an inflection point to correct the aberration of the off-axis field of view and improve the imaging quality of the optical system 100.

[0060] In addition, in some embodiments, the optical system 100 is provided with a stop STO, and the stop STO can be arranged on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L7 arranged on the image side of the sixth lens L6. The infrared filter L7 includes an object side surface S13 and an image side surface S14. Further, the optical system 100 further includes an image plane S15 located on the image side of the sixth lens L6. The incident light can be imaged on the image plane S15 after being adjusted by the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6. It should be noted that the infrared filter L7 can be an infrared cut-off filter for filtering out interfering light to prevent the interfering light from reaching the image plane S15 of the optical system 100 and affecting normal imaging.

[0061] In some embodiments, both the object side surface and the image side surface of each lens of the optical system 100 are aspherical surfaces. The adoption of the aspherical surface structure can improve the flexibility of lens design, effectively correct spherical aberration, and improve imaging quality. In other embodiments, both the object side surface S9 and the image side surface S10 of the fifth lens L5 are aspherical surfaces, while the object side surfaces and the image side surfaces of the remaining lenses of the optical system 100 can both be spherical surfaces. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surfaces of the remaining lenses in the optical system 100 can be any combination of aspherical surfaces or spherical surfaces.

[0062] In some embodiments, the materials of each lens in the optical system 100 can all be glass or all be plastic. Using lenses made of plastic materials can reduce the weight of the optical system 100 and lower the production cost, and cooperate with the smaller size of the optical system to achieve the lightweight and miniaturized design of the optical system. While using lenses made of glass materials enables the optical system 100 to have excellent optical performance and high temperature resistance. It should be noted that the materials of each lens in the optical system 100 can also be any combination of glass and plastic, and do not necessarily have to be all glass or all plastic.

[0063] 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. 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, no cemented lens is formed between the lenses in the first lens L1, but the distances between the lenses are relatively fixed. At this time, 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, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 or the sixth lens L6 in some embodiments can also be greater than or equal to two, and a cemented lens can be formed between any adjacent lenses, or a non-cemented lens can be formed.

[0064] Further, in some embodiments, the optical system 100 satisfies the relationship: 0.60 < CT1 / SD11 < 1.01; where CT1 is the thickness of the first lens L1 on the optical axis, that is, the central thickness of the first lens L1, and SD11 is half of the maximum effective aperture of the object side surface S1 of the first lens L1. Specifically, CT1 / SD11 can be: 0.64, 0.69, 0.73, 0.75, 0.82, 0.86, 0.89, 0.91, 0.93 or 0.98. When the above relationship is satisfied, the first lens L1 can be reasonably configured, so that the head of the camera lens is smaller, meeting the requirements of the miniaturized design of the electronic device.

[0065] In some embodiments, the optical system 100 satisfies the relationship: 5.5 < TTL / CT1 < 9.0; where CT1 is the thickness of the first lens L1 on the optical axis, and TTL is the distance from the object side surface S1 of the first lens L1 to the image S15. Specifically, TTL / CT1 can be: 5.81, 5.92, 6.31, 6.58, 6.85, 6.92, 7.12, 7.34, 7.58 or 7.69. When the above relationship is satisfied, the first lens L1 and the total length of the optical system 100 can be reasonably configured. While ensuring that the head of the camera lens is smaller, the total length of the optical system 100 can be made smaller, further meeting the requirements of the miniaturized design of the electronic device. At the same time, it can also ensure that the first lens L1 has sufficient thickness, so that the processing and forming yield of the first lens L1 is higher, and then the assembly yield of the optical system 100 is improved.

[0066] In some embodiments, the optical system 100 satisfies the relation: 2.2 ≤ FNO ≤ 2.6; where FNO is the f-number of the optical system 100. Specifically, FNO can be 2.30, 2.32, 2.36, 2.39, 2.41, 2.47, 2.48, 2.51, 2.53, or 2.55. When the above relation is satisfied, while ensuring that the optical system 100 has sufficient light transmission, it is also beneficial to make the head of the camera lens smaller.

[0067] In some embodiments, the optical system 100 satisfies the relation: 1 < f3 / f4 < 10; where f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4. Specifically, f3 / f4 can be 1.336, 1.735, 2.208, 2.896, 3.528, 3.619, 4.626, 5.462, 7.264, or 9.218. When the above relation is satisfied, the third lens L3 and the fourth lens L4 can be reasonably configured to effectively expand the field of view angle of the optical system 100, thereby reducing the overall length of the optical system 100 and meeting the requirements of miniaturized design.

[0068] In some embodiments, the optical system 100 satisfies the relation: -2.0 > f4 / f1 + f5 / f6 > -4.0; where f1 is the effective focal length of the first lens L1, f4 is the effective focal length of the fourth lens L4; f5 is the effective focal length of the fifth lens L5, and f6 is the effective focal length of the sixth lens L6. Specifically, f4 / f1 + f5 / f6 can be -3.11, -3.16, -3.19, -3.22, -3.27, -3.41, -3.45, -3.49, -3.53, or -3.58. When the above relation is satisfied, the refractive powers of the first lens L1, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be reasonably configured to ensure that the positive and negative spherical aberrations of the optical system 100 can balance each other, thereby improving the imaging quality of the optical system 100.

[0069] In some embodiments, the optical system 100 satisfies the relation: 1.0 < f / f12 < 1.5; where f is the total effective focal length of the optical system 100, and f12 is the combined focal length of the first lens L1 and the second lens L2. Specifically, f / f12 can be 1.05, 1.06, 1.07, 1.09, 1.10, 1.12, 1.15, 1.16, 1.17, or 1.18. When the above relation is satisfied, the effective focal length of the optical system 100 and the combined focal length of the first lens L1 and the second lens L2 can be reasonably configured to effectively shorten the overall length of the optical system 100, and at the same time, it can avoid excessive increase in the high-order spherical aberration of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0070] In some embodiments, the optical system 100 satisfies the relation: TT / ImgH < 1.1; where TT is the distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S12 of the sixth lens L6, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the optical system 100. Specifically, TT / ImgH can be 1.05, 1.06, 1.07, or 1.08. When the above relation is satisfied, the imaging quality of the optical system 100 on the image surface S15 can be improved, and at the same time, the overall length of the optical system 100 can be effectively shortened, further meeting the requirements of the miniaturized design of the lens.

[0071] In some embodiments, the optical system 100 satisfies the relation: -1.5 < R9 / R10 < 0; where R9 is the curvature radius of the object side surface S9 of the fifth lens L5 on the optical axis, and R10 is the curvature radius of the image side surface S10 of the fifth lens L5 on the optical axis. Specifically, R9 / R10 can be -1.19, -1.15, -1.11, -1.09, -0.98, -0.92, -0.88, -0.82, -0.75, or -0.72. When the above relation is satisfied, the relationship between the object side surface S9 and the image side surface S10 of the fifth lens L5 can be reasonably constrained, thereby reasonably distributing the deflection angle of the optical system 100, and at the same time, the astigmatism of the off-axis field of view of the optical system 100 can be improved, and thus the imaging quality of the optical system 100 can be improved.

[0072] In some embodiments, the optical system 100 satisfies the relation: 1 < |f6| / R12 < 2; where f6 is the effective focal length of the sixth lens L6, and R12 is the curvature radius of the image side surface S12 of the sixth lens L6 on the optical axis. Specifically, |f6| / R12 can be 1.82, 1.84, 1.85, 1.88, 1.89, 1.90, 1.92, 1.96, 1.97, or 1.98. When the above relation is satisfied, the effective focal length of the sixth lens L6 and the image side surface S12 can be reasonably configured to reduce the incident angle of the light rays reaching the image surface S15 of the optical system 100, and thus it is easier for the optical system 100 to match with the photosensitive element.

[0073] In some embodiments, the optical system 100 satisfies the relationship: 1.0 < CT5 / |SAG51| < 5.0; where CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the sag of the object side surface S9 of the fifth lens L5, that is, the distance in the direction parallel to the optical axis from the intersection point of the object side surface S9 of the fifth lens L5 on the optical axis to the position of the maximum effective radius of the object side surface S9 of the fifth lens L5. Specifically, CT5 / |SAG51| can be 1.91, 2.13, 2.52, 2.68, 3.22, 3.34, 3.87, 3.92, 4.13, or 4.26. When the above relationship is satisfied, the fifth lens L5 can be reasonably configured to make the surface shape of the fifth lens L5 more reasonable, so as to reduce the defective rate of the processing and forming of the fifth lens L5. At the same time, the aberration generated by the optical system 100 can be corrected, and the imaging quality of the optical system 100 can be further improved.

[0074] Based on the descriptions of the above embodiments, more specific embodiments and accompanying drawings are presented below for detailed illustration.

[0075] First Embodiment

[0076] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. is a schematic diagram of the optical system 100 in the first embodiment. The optical system 100 includes, in order from the object side to the image side, a stop 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 negative refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. Figure 2 FIGS. are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the first embodiment from left to right. Among them, the astigmatism graph and the distortion graph are both graphs at 555 nm, and the same applies to other embodiments.

[0077] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0078] The image side surface S2 of the first lens L1 is flat at the paraxial region and flat at the circumference;

[0079] The object side surface S3 of the second lens L2 is flat at the paraxial region and flat at the circumference;

[0080] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference;

[0081] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0082] The image side surface S6 of the third lens L3 is convex at the paraxial region and concave at the circumference;

[0083] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the peripheral region;

[0084] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0085] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the peripheral region;

[0086] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0087] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0088] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region.

[0089] The image side surface S2 of the first lens L1 and the object side surface S3 of the second lens L2 are flat surfaces, while the object side surface S1 of the first lens L1, the image side surface S4 of the second lens L2, and the object side surfaces and image side surfaces of the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical surfaces.

[0090] It should be noted that in this application, when it is described that a surface of a lens is convex at the paraxial region (the central region of this side surface), it can be understood that the surface of this lens is convex in the region near the optical axis. When it is described that a surface of a lens is concave at the peripheral region, it can be understood that the surface is concave in the region near the maximum effective radius. For example, when the surface is convex at the optical axis and also convex at the peripheral region, the shape of the surface from the center (optical axis) to the edge direction can be a pure convex surface; or it can be a convex surface shape at the center first, then transition to a concave surface shape, and then become convex again when approaching the maximum effective radius. This is only an example for explaining the relationship between the optical axis and the peripheral region, and various shape structures (concave-convex relationships) of the surface are not fully reflected, but other situations can be deduced according to the above examples.

[0091] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastics.

[0092] Furthermore, the optical system 100 satisfies the relational expression: CT1 / SD11 = 1.001; where CT1 is the thickness of the first lens L1 on the optical axis, that is, the central thickness of the first lens L1, and SD11 is half of the maximum effective aperture of the object side surface S1 of the first lens L1. When the above relational expression is satisfied, the first lens L1 can be reasonably configured, and then the head of the camera lens is smaller, meeting the requirements of the miniaturization design of the electronic device.

[0093] The optical system 100 satisfies the relation: TTL / CT1 = 5.80; where CT1 is the thickness of the first lens L1 on the optical axis, and TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface S15. When the above relation is satisfied, the total length of the first lens L1 and the optical system 100 can be reasonably configured. While ensuring a smaller head of the camera lens, the total length of the optical system 100 can be made smaller, further meeting the requirements of the miniaturization design of the electronic device. At the same time, it can also ensure that the first lens L1 has sufficient thickness, so that the processing and forming yield of the first lens L1 is higher, and then the assembly yield of the optical system 100 is improved.

[0094] The optical system 100 satisfies the relation: FNO = 2.54; where FNO is the f-number of the optical system 100. When the above relation is satisfied, while ensuring that the optical system 100 has sufficient light transmittance, it is also beneficial to make the head of the camera lens smaller.

[0095] The optical system 100 satisfies the relation: f3 / f4 = 9.218; where f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4. When the above relation is satisfied, the third lens L3 and the fourth lens L4 can be reasonably configured to effectively expand the field of view angle of the optical system 100, and then reduce the total length of the optical system 100, meeting the requirements of the miniaturization design.

[0096] The optical system 100 satisfies the relation: f4 / f1 + f5 / f6 = -3.58; where f1 is the effective focal length of the first lens L1, f4 is the effective focal length of the fourth lens L4; f5 is the effective focal length of the fifth lens L5, and f6 is the effective focal length of the sixth lens L6. When the above relation is satisfied, the refractive powers of the first lens L1, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be reasonably configured to ensure that the positive and negative spherical aberrations of the optical system 100 can be balanced with each other, and then improve the imaging quality of the optical system 100.

[0097] The optical system 100 satisfies the relation: f / f12 = 1.05; where f is the total effective focal length of the optical system 100, and f12 is the combined focal length of the first lens L1 and the second lens L2. When the above relation is satisfied, the effective focal length of the optical system 100 and the combined focal length of the first lens L1 and the second lens L2 can be reasonably configured to effectively shorten the total length of the optical system 100, and at the same time, it can avoid excessive increase of the high-order spherical aberration of the optical system 100, and then improve the imaging quality of the optical system 100.

[0098] The optical system 100 satisfies the relation: TT / ImgH = 1.05; where TT is the distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S12 of the sixth lens L6, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the optical system 100. When the above relation is satisfied, the imaging quality of the optical system 100 on the image surface S15 can be improved, and at the same time, the overall length of the optical system 100 can be effectively shortened, further meeting the requirements of the miniaturized design of the lens.

[0099] The optical system 100 satisfies the relation: R9 / R10 = -1.19; where R9 is the curvature radius of the object side surface S9 of the fifth lens L5 on the optical axis, and R10 is the curvature radius of the image side surface S10 of the fifth lens L5 on the optical axis. When the above relation is satisfied, the relationship between the object side surface S9 and the image side surface S10 of the fifth lens L5 can be reasonably constrained, so as to reasonably distribute the deflection angle of the optical system 100, and at the same time, the astigmatism of the off-axis field of the optical system 100 can be improved, thereby improving the imaging quality of the optical system 100.

[0100] The optical system 100 satisfies the relation: |f6| / R12 = 1.83; where f6 is the effective focal length of the sixth lens L6, and R12 is the curvature radius of the image side surface S12 of the sixth lens L6 on the optical axis. When the above relation is satisfied, the effective focal length of the sixth lens L6 and the image side surface S12 can be reasonably configured to reduce the incident angle of light reaching the image surface S15 of the optical system 100, thereby making it easier for the optical system 100 to match with the photosensitive element.

[0101] The optical system 100 satisfies the relation: CT5 / |SAG51| = 3.70; where CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the sagitta of the object side surface S9 of the fifth lens L5. When the above relation is satisfied, the fifth lens L5 can be reasonably configured to make the surface shape of the fifth lens L5 more reasonable, so as to reduce the defective rate of the processing and forming of the fifth lens L5, and at the same time, the aberration generated by the optical system 100 can be corrected, further improving the imaging quality of the optical system 100.

[0102] In addition, the parameters of the optical system 100 are given in Table 1. Among them, the image plane S15 in Table 1 can be understood as the imaging plane of the optical system 100. The components from the object plane (not shown in the figure) to the image plane S15 are arranged in sequence according to the order of the components in Table 1 from top to bottom. 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. The surface numbers 1 and 2 are the object side S1 and the image side S2 of the first lens L1 respectively. That is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. 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 on the optical axis from the image side of the lens to the object side of the subsequent lens in the image side direction.

[0103] It should be noted that in this embodiment and the following embodiments, the optical system 100 may not be provided with an infrared filter L7, but in this case, the distance from the image side S11 of the sixth lens L6 to the image plane S15 remains unchanged.

[0104] In the first embodiment, the total effective focal length f of the optical system 100 is 3.68 mm, the f-number FNO is 2.54, half of the maximum field of view angle HFOV is 41.06°, and the distance TTL on the optical axis from the object side S1 of the first lens L1 to the image plane S15 is 4.4 mm.

[0105] And the focal lengths, refractive indices, and Abbe numbers of the lenses are the values at a wavelength of 555 nm, which is the same for other embodiments.

[0106] Table 1

[0107]

[0108] Furthermore, the aspherical 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 10 represent the image side or object side S1 - S10 respectively. And K - A20 from top to bottom represent the types of aspherical coefficients. Among them, K represents the conic coefficient, A4 represents the fourth-order aspherical coefficient, A6 represents the sixth-order aspherical coefficient, A8 is the eighth-order aspherical coefficient, and so on. In addition, the aspherical coefficient formula is as follows:

[0109]

[0110] 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 surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula.

[0111] Table 2

[0112]

[0113]

[0114] Second Embodiment

[0115] Please refer to Figure 3 and Figure 4 , Figure 3 FIG. is a schematic diagram of the optical system 100 in the second embodiment. The optical system 100 sequentially includes a stop 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 negative refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power from the object side to the image side. Figure 4 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the second embodiment.

[0116] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0117] The image side surface S2 of the first lens L1 is flat at the paraxial region and flat at the circumference;

[0118] The object side surface S3 of the second lens L2 is flat at the paraxial region and flat at the circumference;

[0119] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference;

[0120] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0121] The image side surface S6 of the third lens L3 is convex at the paraxial region and concave at the circumference;

[0122] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the circumference;

[0123] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the circumference;

[0124] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the circumference;

[0125] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the circumference;

[0126] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the circumference;

[0127] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the circumference;.

[0128] The image side surface S2 of the first lens L1 and the object side surface S3 of the second lens L2 are flat surfaces, while the object side surface S1 of the first lens L1, the image side surface S4 of the second lens L2, and the object side surfaces and image side surfaces of the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical surfaces.

[0129] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastics.

[0130] In addition, the parameters of the optical system 100 are given in Table 3, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0131] Table 3

[0132]

[0133]

[0134] Furthermore, the aspherical coefficients of the image side surfaces or object side surfaces of the lenses of the optical system 100 are given in Table 4, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0135] Table 4

[0136]

[0137]

[0138] And, based on the parameter information provided above, the following relationships can be deduced:

[0139] CT1 / SD11 = 0.967; TTL / CT1 = 6.03; FNO = 2.55; f3 / f4 = 6.534;

[0140] f4 / f1 + f5 / f6 = -3.57; f / f12 = 1.06; TT / ImgH = 1.05; R9 / R10 = -1.15;

[0141] |f6| / R12 = 1.82; CT5 / |SAG51| = 3.78.

[0142] Third Embodiment

[0143] Please refer to Figure 5 and Figure 6 , Figure 5It is a schematic diagram of the optical system 100 in the third embodiment. The optical system 100 includes, in order from the object side to the image side, a stop 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 negative refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. Figure 6 From left to right are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the third embodiment.

[0144] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference.

[0145] The image side surface S2 of the first lens L1 is concave at the paraxial region and concave at the circumference.

[0146] The object side surface S3 of the second lens L2 is convex at the paraxial region and convex at the circumference.

[0147] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference.

[0148] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the circumference.

[0149] The image side surface S6 of the third lens L3 is convex at the paraxial region and concave at the circumference.

[0150] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the circumference.

[0151] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the circumference.

[0152] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the circumference.

[0153] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the circumference.

[0154] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the circumference.

[0155] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the circumference.

[0156] The object side surfaces and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical surfaces.

[0157] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastics.

[0158] In addition, the parameters of the optical system 100 are given in Table 5, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0159] Table 5

[0160]

[0161]

[0162] Furthermore, the aspherical coefficients of the object or image sides of the lenses of the optical system 100 are given in Table 6, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0163] Table 6

[0164]

[0165] And, based on the parameter information provided above, the following relationships can be deduced:

[0166] CT1 / SD11 = 0.85; TTL / CT1 = 6.60; FNO = 2.41; f3 / f4 = 3.689;

[0167] f4 / f1 + f5 / f6 = -3.25; f / f12 = 1.08; TT / ImgH = 1.07; R9 / R10 = -1.00;

[0168] |f6| / R12 = 1.86; CT5 / |SAG51| = 4.3.

[0169] Fourth Embodiment

[0170] Please refer to Figure 7 and Figure 8 , Figure 7 , which are schematic diagrams of the optical system 100 in the fourth embodiment. The optical system 100 sequentially includes a 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 positive refractive power, and a sixth lens L6 with negative refractive power from the object side to the image side. Figure 8 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the fourth embodiment.

[0171] The object side S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0172] The image side S2 of the first lens L1 is concave at the paraxial region and concave at the circumference;

[0173] The object side surface S3 of the second lens L2 is convex at the paraxial region and convex at the peripheral region;

[0174] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the peripheral region;

[0175] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the peripheral region;

[0176] The image side surface S6 of the third lens L3 is convex at the paraxial region and concave at the peripheral region;

[0177] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the peripheral region;

[0178] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0179] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the peripheral region;

[0180] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0181] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0182] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region;

[0183] The object side surfaces and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0184] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastics.

[0185] In addition, the parameters of the optical system 100 are given in Table 7, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0186] Table 7

[0187]

[0188] Furthermore, the aspherical coefficients of the image side surfaces or object side surfaces of the lenses of the optical system 100 are given in Table 8, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0189] Table 8

[0190]

[0191]

[0192] Furthermore, based on the parameter information provided above, the following relationships can be deduced:

[0193] CT1 / SD11 = 0.82; TTL / CT1 = 6.84; FNO = 2.41; f3 / f4 = 3.148;

[0194] f4 / f1 + f5 / f6 = -3.21; f / f12 = 1.10; TT / ImgH = 1.07; R9 / R10 = -1.00;

[0195] |f6| / R12 = 1.87; CT5 / |SAG51| = 4.26.

[0196] Fifth Embodiment

[0197] Please refer to Figure 9 and Figure 10 , Figure 9 which are schematic diagrams of the optical system 100 in the fifth embodiment. The optical system 100 includes, in sequence from the object side to the image side, a 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 positive refractive power, and a sixth lens L6 with negative refractive power. Figure 10 From left to right are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the fifth embodiment.

[0198] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0199] The image side surface S2 of the first lens L1 is concave at the paraxial region and concave at the circumference;

[0200] The object side surface S3 of the second lens L2 is convex at the paraxial region and convex at the circumference;

[0201] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference;

[0202] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0203] The image side surface S6 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0204] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the circumference;

[0205] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the circumference;

[0206] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the peripheral region;

[0207] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0208] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0209] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region.

[0210] The object side surfaces and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspherical surfaces.

[0211] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastics.

[0212] In addition, the parameters of the optical system 100 are given in Table 9, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0213] Table 9

[0214]

[0215] Furthermore, the aspherical coefficients of the image side surfaces or object side surfaces of the lenses of the optical system 100 are given in Table 10, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0216] Table 10

[0217]

[0218]

[0219] And, according to the parameter information provided above, the following relationships can be deduced:

[0220] CT1 / SD11 = 0.712; TTL / CT1 = 7.69; FNO = 2.35; f3 / f4 = 1.707;

[0221] f4 / f1 + f5 / f6 = -3.10; f / f12 = 1.16; TT / ImgH = 1.08; R9 / R10 = -0.86;

[0222] |f6| / R12 = 1.89; CT5 / |SAG51| = 2.61.

[0223] Sixth Embodiment

[0224] Please refer to Figure 11 and Figure 12 , Figure 11 which is a schematic diagram of the optical system 100 in the sixth embodiment. The optical system 100 sequentially includes a 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 positive refractive power, and a sixth lens L6 with negative refractive power from the object side to the image side. Figure 12 From left to right are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the sixth embodiment.

[0225] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0226] The image side surface S2 of the first lens L1 is concave at the paraxial region and concave at the circumference;

[0227] The object side surface S3 of the second lens L2 is convex at the paraxial region and convex at the circumference;

[0228] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference;

[0229] The object side surface S5 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0230] The image side surface S6 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0231] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the circumference;

[0232] The image side surface S8 of the fourth lens L4 is concave at the paraxial region and convex at the circumference;

[0233] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and concave at the circumference;

[0234] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the circumference;

[0235] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the circumference;

[0236] The image side surface S12 of the sixth lens L"6" is concave at the paraxial region and concave at the circumference.

[0237] The object side surfaces and image side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical surfaces.

[0238] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastics.

[0239] In addition, the parameters of the optical system 100 are given in Table 11, and the definitions of the parameters can be obtained from the first embodiment and will not be elaborated here.

[0240] Table 11

[0241]

[0242]

[0243] Furthermore, the aspherical coefficients of the image side or object side of each lens of the optical system 100 are given in Table 12, and the definitions of the parameters can be obtained from the first embodiment and will not be elaborated here.

[0244] Table 12

[0245]

[0246] Moreover, based on the parameter information provided above, the following relationships can be deduced:

[0247] CT1 / SD11 = 0.636; TTL / CT1 = 8.4; FNO = 2.30; f3 / f4 = 1.336;

[0248] f4 / f1 + f5 / f6 = -3.17; f / f12 = 1.18; TT / ImgH = 1.08; R9 / R10 = -0.72;

[0249] |f6| / R12 = 1.98; CT5 / |SAG51| = 1.91.

[0250] Please refer to Figure 13 , in 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 plane S15 of the optical system 100. The imaging module 200 can also be provided with an infrared filter L7, and the infrared filter L7 is disposed between the image side S12 of the sixth lens L6 and the image plane S15. Specifically, the photosensitive element 210 can be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor). Using the optical system 100 in the imaging module 200 makes the head of the camera lens smaller, meeting the requirements of the miniaturized design of electronic devices.

[0251] Please refer to Figure 14 , in some embodiments, the imaging module 200 can be applied to the electronic device 300. The electronic device includes a housing 310, and the imaging module 200 is installed on the housing 310. Specifically, the electronic device 300 can be, but is not limited to, in-vehicle imaging devices such as mobile phones, video phones, smart phones, e-book readers, dash cams, or wearable devices such as smart watches. By adopting the imaging module 200 in the electronic device 300, the head of the lens in the electronic device 300 is smaller, which can meet the requirements of the miniaturized design of the electronic device 300. Further, it can be understood that in some embodiments, when the electronic device 300 is a smart phone, the lens in the electronic device 300 can be installed in the housing 310 in a form of under-screen packaging. At this time, an opening needs to be made in the screen of the electronic device 300 to expose the lens, so that the light outside the electronic device 300 can enter the inside of the electronic device 300 through the optical system 100 and form an image on the photosensitive surface of the photosensitive element 210. By adopting the above-mentioned imaging module 200 in the electronic device 300, since the head of the lens is smaller, a smaller opening in the screen of the electronic device 300 can expose the lens, thereby increasing the screen-to-body ratio of the electronic device 300 and further meeting the requirements of the miniaturized design of the electronic device 300.

[0252] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0253] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An optical system, characterized in that, There are a total of six lenses with refractive power, which successively include, from the object side to the image side: A first lens with positive refractive power, the object side surface of the first lens being convex near the optical axis; A second lens with refractive power, the image side surface of the second lens being concave near the optical axis; A third lens with negative refractive power, the object side surface of the third lens being concave near the optical axis, and both the object side surface and the image side surface of the third lens being concave at the circumference; A fourth lens with negative refractive power, both the object side surface and the image side surface of the fourth lens being concave near the optical axis; A fifth lens with positive refractive power, both the object side surface and the image side surface of the fifth lens being convex near the optical axis, and at least one of the object side surface and the image side surface of the fifth lens having an inflection point; A sixth lens with negative refractive power, the image side surface of the sixth lens being concave near the optical axis; And the optical system satisfies the following relationships: 0.60 < CT1 / SD11 < 1.01; 5.5 < TTL / CT1 < 9.0; 1.0 < CT5 / |SAG51| < 5.0; Wherein, CT1 is the thickness of the first lens on the optical axis, SD11 is half of the maximum effective aperture of the object side surface of the first lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system, CT5 is the thickness of the fifth lens on the optical axis, and SAG51 is the sagitta of the object side surface of the fifth lens.

2. The optical system according to claim 1, wherein, Satisfies the following relationship: 2.2 ≤ FNO ≤ 2.6; Wherein, FNO is the f-number of the optical system.

3. The optical system according to claim 1, wherein Satisfies the following relationship: 1.336 < f3 / f4 < 10; Wherein, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

4. The optical system according to claim 1, wherein Satisfies the following relationship: 1.0 < f / f12 < 1.5; Wherein, f is the total effective focal length of the optical system, and f12 is the combined focal length of the first lens and the second lens.

5. The optical system according to claim 1, characterized in that, Satisfies the following relationship: TT / ImgH < 1.1; Wherein, TT is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical system.

6. The optical system according to claim 1, characterized in that, Satisfies the following relationship: -1.5 < R9 / R10 < 0; Wherein, R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis.

7. The optical system according to claim 1, characterized in that, Satisfies the following relationship: 1 < |f6| / R12 < 2; Wherein, f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis.

8. An imaging module, characterized in that, Includes a photosensitive element and the optical system according to any one of claims 1-7, and the photosensitive element is disposed on the image side of the optical system.

9. An electronic device, characterized in that, Includes a housing and the imaging module according to claim 8, and the imaging module is mounted on the housing.

Images