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 includes, from the object side to the image side, in sequence: a first lens with positive refractive power, the object side surface of the first lens is convex at the paraxial position, and the image side surface is concave at the paraxial position; a second lens with negative refractive power, the object side surface of the second lens is convex at the paraxial position, and the image side surface is concave at the paraxial position; a third lens with refractive power; a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with negative refractive power, the image side surface of the sixth lens is concave at the paraxial position; and the optical system satisfies the following conditional formula: f*tan(HFOV)≥5.3mm; wherein f is the effective focal length of the optical system, and HFOV is half of the maximum field of view angle of the optical system. The above optical system has the characteristics of a large image surface.

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 rapid development of science and technology, consumers have higher and higher requirements for the imaging quality of mobile electronic products such as smartphones. Optical systems with large image planes can better cooperate with photosensitive elements to obtain higher resolution, thereby improving the image quality of electronic products, improving resolution and clarity, and meeting the requirements of high imaging quality. However, the image plane size of current optical systems is insufficient and it is difficult to match image sensors with larger photosensitive surfaces, resulting in the difficulty in effectively improving the pixels of electronic products. Summary of the invention

[0003] Based on this, it is necessary to provide an optical system, an imaging module and an electronic device so that the optical system has the characteristics of a large image surface.

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

[0005] A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the paraxial position, and the image side surface of the first lens is concave at the paraxial position;

[0006] a second lens having negative refractive power, wherein the object side surface of the second lens is convex at the paraxial position, and the image side surface of the second lens is concave at the paraxial position;

[0007] a third lens having refractive power;

[0008] a fourth lens having a refractive power;

[0009] a fifth lens having refractive power;

[0010] a sixth lens having negative refractive power, wherein the image side surface of the sixth lens is concave at the paraxial position;

[0011] And the optical system satisfies the following conditional formula:

[0012] f*tan(HFOV)≥5.3mm;

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

[0014] In the above optical system, the first lens has a positive refractive power, which helps to shorten the total length of the optical system, and the object side of the first lens is a convex surface at the paraxial position, which can further enhance the positive refractive power of the first lens, making the size of the optical system in the optical axis direction shorter, which is conducive to the miniaturization design of the optical system. When the above conditional formula is met, the optical system can have the characteristics of a large image surface, so that the optical system can more easily match a large-sized photosensitive element, which is conducive to making the optical system have the characteristics of high pixels and high definition.

[0015] In one embodiment, the optical system satisfies the following condition:

[0016] TTL / ImgH≤1.3;

[0017] 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, that is, the total optical length of the optical system, and ImgH is half of the image height corresponding to the maximum field angle of the optical system, that is, the radius of the effective imaging circle of the optical system. When the above conditional formula is met, the axial dimension of the optical system can be shortened, which is conducive to realizing the ultra-thin design and miniaturized design of the optical system.

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

[0019] 0.5≤f2 / f6≤3.5;

[0020] Wherein, f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens. When the above conditional formula is satisfied, the ratio of the effective focal lengths of the second lens and the sixth lens can be reasonably configured to reasonably distribute the spherical aberration contribution of the second lens and the sixth lens to the optical system, so that the paraxial region of the optical system has good imaging quality.

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

[0022] FNO≤2;

[0023] Wherein, FNO is the aperture number of the optical system. When the above conditional formula is met, the aperture number of the optical system can be reasonably configured to ensure that the optical system has a large aperture characteristic, so that the optical system has a sufficient amount of light entering, thereby making the image captured by the optical system clearer, so that the optical system can also have high imaging quality when shooting night scenes and low-brightness object space scenes of starry sky lights.

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

[0025] 0.3mm≤CT2≤0.35mm;

[0026] Wherein, CT2 is the thickness of the second lens on the optical axis, that is, the center thickness of the second lens. When the above conditional formula is met, the center thickness of the second lens can be reasonably configured, so that the second lens has good processing characteristics, and it is also beneficial to shorten the total optical length of the optical system, thereby facilitating the miniaturization design of the optical system.

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

[0028] 0.5≤R9 / R11≤1.5;

[0029] Wherein, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, and R11 is the radius of curvature of the object side of the sixth lens at the optical axis. When the above conditional formula is satisfied, the radius of curvature of the object side of the fifth lens and the object side of the sixth lens can be reasonably configured, so that the difference in the surface shape of the incident surface of the last two lenses of the system at the paraxial position will not be too large, so as to effectively balance the on-axis aberration of the optical system, thereby improving the optical performance of the optical system, and also reducing the sensitivity of the surface shape of the fifth lens and the sixth lens, reducing the difficulty of preparation, and improving the optical performance of the optical system 100.

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

[0031] 1.0≤TTL / f≤1.2;

[0032] 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. When the above conditional formula is met, the total optical length and effective focal length of the optical system can be reasonably configured, which is conducive to realizing miniaturized design and improving the optical performance of the optical system. When it is lower than the lower limit of the above conditional formula, the total optical length of the optical system is too short, which will increase the sensitivity of the optical system and make it difficult to correct the aberration of the optical system. When it exceeds the upper limit of the above conditional formula, the total optical length of the optical system is too long, which is not conducive to the miniaturized design of the optical system.

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

[0034] 0.3≤|SAG51 / CT5|≤1.0;

[0035] Wherein, SAG51 is the sagittal height of the object side surface of the fifth lens, that is, the distance from the intersection of the object side surface of the fifth lens and the optical axis to the maximum effective aperture position of the object side surface of the fifth lens in the direction of the optical axis, and CT5 is the thickness of the fifth lens on the optical axis, that is, the center thickness of the fifth lens. When the above conditional formula is met, the sagittal height and center thickness of the object side surface of the fifth lens can be reasonably configured, which is beneficial to the

[0036] Processing and molding can reduce the tolerance sensitivity of manufacturing the fifth lens, thereby improving the molding yield of the fifth lens.

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

[0038] ET4≥0.4mm;

[0039] Wherein, ET4 is the distance from the maximum effective aperture of the object side of the fourth lens to the maximum effective aperture of the image side of the fourth lens in the optical axis direction, that is, the edge thickness of the fourth lens. When the above conditional formula is met, the edge thickness of the fourth lens can be reasonably configured, thereby reasonably controlling the size of the distortion generated by the fourth lens and improving the optical performance of the optical system.

[0040] An imaging module comprises a photosensitive element and the optical system described in any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system. The above optical system is used in the imaging module, and the optical system has the characteristics of a large image surface, which is conducive to the imaging module having the characteristics of high pixels and high definition.

[0041] An electronic device comprises a housing and the above-mentioned imaging module, wherein the imaging module is arranged in the housing. When the above-mentioned imaging module is adopted in the electronic device, the optical system has the characteristics of a large image plane, which is conducive to the electronic device having the characteristics of high pixels and high definition. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

[0050] Fig. 9 is a schematic diagram of an optical system in a fifth embodiment of the present application;

[0051] Fig.10 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment of the present application;

[0052] Fig.11 is a schematic diagram of an optical system in a sixth embodiment of the present application;

[0053] Fig.12 The spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the sixth embodiment of the present application;

[0054] Fig.13 is a schematic diagram of an imaging module in an embodiment of the present application;

[0055] Fig.14 It is a schematic diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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, and a sixth lens L6. 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.

[0063] Among them, the first lens L1 has a 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 a convex surface at the paraxial position, which can further enhance the positive refractive power of the first lens L1, so that the size of the optical system 100 in the direction of the optical axis 110 becomes shorter, which is conducive to the miniaturization design of the optical system 100. The image side surface S2 of the first lens L1 is a concave surface at the paraxial position. The second lens L2 has a negative refractive power, the object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and the image side surface S4 is a concave surface at the paraxial position. The third lens L3, the fourth lens L4 and the fifth lens L5 have refractive power. The sixth lens L6 has a negative refractive power, and the image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position.

[0064] In addition, in some embodiments, the optical system 100 is provided with an aperture 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 L7 provided on the image side of the sixth lens L6, and 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, and the image plane S15 is the imaging plane of the optical system 100. 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 is worth noting that the infrared filter L7 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 S15 of the optical system 100 and affecting normal imaging.

[0065] 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.

[0066] 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.

[0067] 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, or the sixth lens L6 may be greater than or equal to two, and any adjacent lenses may form a cemented lens or a non-cemented lens.

[0068] Furthermore, in some embodiments, the optical system 100 satisfies the conditional formula: f*tan(HFOV)≥5.3mm; wherein f is the effective focal length of the optical system 100, in mm, and HFOV is half of the maximum field of view of the optical system 100, in degrees. Specifically, f*tan(HFOV) may be: 5.34, 5.35, 5.36, or 5.37. When the above conditional formula is satisfied, the optical system 100 can have the characteristics of a large image plane, thereby making it easier for the optical system 100 to match a large-size photosensitive element, which is conducive to making the optical system 100 have the characteristics of high pixels and high definition.

[0069] In some embodiments, the optical system 100 satisfies the conditional formula: TTL / ImgH≤1.3; 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 110, that is, the total optical length of the optical system 100, and ImgH is half of the image height corresponding to the maximum field angle of the optical system 100. Specifically, TTL / ImgH may be: 1.28. When the above conditional formula is satisfied, the axial dimension of the optical system 100 can be shortened, which is conducive to realizing the ultra-thin design and miniaturized design of the optical system 100.

[0070] In some embodiments, the optical system 100 satisfies the conditional formula: 0.5≤f2 / f6≤3.5; wherein f2 is the effective focal length of the second lens L2, and f6 is the effective focal length of the sixth lens L6. Specifically, f2 / f6 can be: 0.86, 0.94, 1.12, 1.26, 1.52, 1.99, 2.35, 2.88, 2.94 or 3.07. When the above conditional formula is satisfied, the ratio of the effective focal lengths of the second lens L2 and the sixth lens L6 can be reasonably configured to reasonably allocate the spherical aberration contribution of the second lens L2 and the sixth lens L6 to the optical system 100, so that the paraxial region of the optical system 100 has good imaging quality.

[0071] In some embodiments, the optical system 100 satisfies the conditional formula: FNO≤2; wherein FNO is the aperture number of the optical system 100. Specifically, FNO can be: 1.89, 1.90, 1.91, 1.92, 1.93, 1.94, 1.95, 1.96 or 1.97. When the above conditional formula is met, the aperture number of the optical system 100 can be reasonably configured to ensure that the optical system 100 has a large aperture characteristic, so that the optical system 100 has a sufficient amount of light entering, thereby making the image captured by the optical system 100 clearer, so that the optical system 100 can also have high imaging quality when shooting night scenes and low-brightness object space scenes of starry sky lights.

[0072] In some embodiments, the optical system 100 satisfies the conditional formula: 0.3mm≤CT2≤0.35mm; wherein CT2 is the thickness of the second lens L2 on the optical axis 110, that is, the center thickness of the second lens L2. Specifically, CT2 can be: 0.300, 0.305, 0.309, 0.310, 0.312, 0.316, 0.319, 0.325, 0.327 or 0.338, and the numerical unit is mm. When the above conditional formula is satisfied, the center thickness of the second lens L2 can be reasonably configured, so that the second lens L2 has good processing characteristics, and it is also beneficial to shorten the total optical length of the optical system 100, and further beneficial to the miniaturization design of the optical system 100.

[0073] In some embodiments, the optical system 100 satisfies the condition: 0.5≤R9 / R11≤1.5, wherein R9 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis 110, and R11 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis 110. Specifically, R9 / R11 may be: 0.52, 0.58, 0.60, 0.67, 0.77, 0.93, 1.02, 1.21, 1.33 or 1.45. When the above conditional expression is satisfied, the curvature radii of the object-side surface S9 of the fifth lens L5 and the object-side surface S11 of the sixth lens L6 can be reasonably configured, so that the surface shape difference of the light-entering surfaces of the last two lenses of the system at the paraxial position will not be too large, so as to effectively balance the axial aberration of the optical system 100, thereby improving the optical performance of the optical system 100. In addition, the sensitivity of the surface shapes of the fifth lens L5 and the sixth lens L6 can be reduced, the difficulty of manufacturing can be reduced, and the optical performance of the optical system 100 can be improved.

[0074] In some embodiments, the optical system 100 satisfies the conditional expression: 1.0≤TTL / f≤1.2; 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 110. Specifically, TTL / f may be: 1.169, 1.170, 1.171, 1.172, 1.173 or 1.174. When the above conditional expression is satisfied, the total optical length and effective focal length of the optical system 100 can be reasonably configured, which is conducive to miniaturization design and to improving the optical performance of the optical system 100. When the conditional expression is lower than the lower limit, the total optical length of the optical system 100 is too short, which increases the sensitivity of the optical system 100 and makes it difficult to correct the aberration of the optical system 100. When the conditional expression is exceeded, the total optical length of the optical system 100 is too long, which is not conducive to miniaturization design of the optical system 100.

[0075] In some embodiments, the optical system 100 satisfies the conditional formula: 0.3≤|SAG51 / CT5|≤1.0; wherein SAG51 is the sagittal height of the object side surface S9 of the fifth lens L5, and CT5 is the thickness of the fifth lens L5 on the optical axis, that is, the center thickness of the fifth lens L5. Specifically, |SAG51 / CT5| can be: 0.50, 0.52, 0.53, 0.55, 0.56, 0.59, 0.61, 0.64, 0.65 or 0.69. When the above conditional formula is met, the sagittal height of the object side surface S9 and the center thickness of the fifth lens L5 can be reasonably configured, which is beneficial to the processing and molding of the fifth lens L5, reduces the tolerance sensitivity of the manufacturing of the fifth lens L5, and thereby improves the molding yield of the fifth lens L5.

[0076] In some embodiments, the optical system 100 satisfies the conditional formula: ET4 ≥ 0.4 mm; wherein ET4 is the edge thickness of the fourth lens L4. Specifically, ET4 can be: 0.42, 0.43, 0.45, 0.47, 0.48, 0.49, 0.50, 0.53, 0.54 or 0.55. When the above conditional formula is met, the edge thickness of the fourth lens L4 can be reasonably configured, thereby reasonably controlling the size of the distortion generated by the fourth lens L4 and improving the optical performance of the optical system 100.

[0077] Based on the description of the above embodiments, more specific embodiments and drawings are presented below for detailed description.

[0078] First embodiment

[0079] 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 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 From left to right are graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, wherein the reference wavelength of the astigmatism graph and the distortion graph is 555 nm, which is the same as in other embodiments.

[0080] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0081] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0082] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0083] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0084] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0085] The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

[0086] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0087] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0088] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0089] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0090] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0091] The image-side surface S12 of the sixth lens L6 is concave at the paraxial position and is convex at the circumference.

[0092] 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 , and the sixth lens L6 are all aspherical surfaces.

[0093] 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 110 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 110 and also convex at the circumference, the shape of the surface from the center (optical axis 110) to the edge direction can be a pure convex surface; 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 110 and the circumference. 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.

[0094] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 and the sixth lens L6 are all made of plastic.

[0095] Furthermore, the optical system 100 satisfies the conditional expression: f*tan(HFOV)=5.34; wherein f is the effective focal length of the optical system 100, in mm, and HFOV is half of the maximum field angle of the optical system 100, in degrees. When the above conditional expression is satisfied, the optical system 100 can have the characteristics of a large image plane, so that the optical system 100 can be more easily matched with a large-sized photosensitive element, which is conducive to making the optical system 100 have the characteristics of high pixels and high definition.

[0096] The optical system 100 satisfies the conditional expression: TTL / ImgH=1.28; 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 110, that is, the total optical length of the optical system 100, and ImgH is half of the image height corresponding to the maximum field angle of the optical system 100. When the above conditional expression is satisfied, the axial dimension of the optical system 100 can be shortened, which is conducive to realizing the ultra-thin design and miniaturized design of the optical system 100.

[0097] The optical system 100 satisfies the conditional expression: f2 / f6=2.73; wherein f2 is the effective focal length of the second lens L2, and f6 is the effective focal length of the sixth lens L6. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the second lens L2 and the sixth lens L6 can be reasonably configured to reasonably allocate the spherical aberration contributions of the second lens L2 and the sixth lens L6 to the optical system 100, so that the paraxial region of the optical system 100 has good imaging quality.

[0098] The optical system 100 satisfies the conditional formula: FNO=1.97; wherein FNO is the aperture number of the optical system 100. When the above conditional formula is satisfied, the aperture number of the optical system 100 can be reasonably configured to ensure that the optical system 100 has a large aperture characteristic, so that the optical system 100 has a sufficient amount of light entering, and the image captured by the optical system 100 is clearer, so that the optical system 100 can also have high imaging quality when shooting night scenes and low-brightness object space scenes of starry sky lights.

[0099] The optical system 100 satisfies the conditional expression: CT2=0.300 mm, wherein CT2 is the thickness of the second lens L2 on the optical axis 110, that is, the center thickness of the second lens L2. When the conditional expression is satisfied, the center thickness of the second lens L2 can be reasonably configured, so that the second lens L2 has good processing characteristics, and is also conducive to shortening the total optical length of the optical system 100, thereby facilitating the miniaturization design of the optical system 100.

[0100] The optical system 100 satisfies the conditional formula: R9 / R11=0.61; wherein R9 is the curvature radius of the object-side surface S9 of the fifth lens L5 at the optical axis 110, and R11 is the curvature radius of the object-side surface S11 of the sixth lens L6 at the optical axis 110. When the above conditional formula is satisfied, the curvature radii of the object-side surface S9 of the fifth lens L5 and the object-side surface S11 of the sixth lens L6 can be reasonably configured to effectively balance the axial aberration of the optical system 100, thereby improving the optical performance of the optical system 100, and also reducing the sensitivity of the surface shapes of the fifth lens L5 and the sixth lens L6, reducing the difficulty of manufacturing, and improving the optical performance of the optical system 100.

[0101] The optical system 100 satisfies the conditional expression: TTL / f=1.169; 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 110. When the above conditional expression is satisfied, the total optical length and effective focal length of the optical system 100 can be reasonably configured, which is conducive to realizing a miniaturized design and improving the optical performance of the optical system 100. When it is lower than the lower limit of the above conditional expression, the total optical length of the optical system 100 is too short, which will increase the sensitivity of the optical system 100 and make it difficult to correct the aberration of the optical system 100. When it exceeds the upper limit of the above conditional expression, the total optical length of the optical system 100 is too long, which is not conducive to the miniaturized design of the optical system 100.

[0102] The optical system 100 satisfies the conditional formula: |SAG51 / CT5|=0.50; wherein SAG51 is the sagittal height of the object side surface S9 of the fifth lens L5, and CT5 is the thickness of the fifth lens L5 on the optical axis, that is, the center thickness of the fifth lens L5. When the above conditional formula is satisfied, the sagittal height of the object side surface S9 and the center thickness of the fifth lens L5 can be reasonably configured, which is beneficial to the processing and molding of the fifth lens L5, reduces the tolerance sensitivity of the manufacturing of the fifth lens L5, and thus improves the molding yield of the fifth lens L5.

[0103] The optical system 100 satisfies the conditional formula: ET4=0.45 mm, where ET4 is the edge thickness of the fourth lens L4. When the above conditional formula is satisfied, the edge thickness of the fourth lens L4 can be reasonably configured, thereby reasonably controlling the size of the distortion generated by the fourth lens L4 and improving the optical performance of the optical system 100.

[0104] In addition, various 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 elements from the object plane (not shown) to the image plane S15 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 110. 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 110, 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 110.

[0105] It should be noted that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L7, but in this case the distance from the image side surface S12 to the image surface S15 of the sixth lens L6 remains unchanged.

[0106] In the first embodiment, the total effective focal length f of the optical system 100 is 5.99 mm, the aperture number FNO is 1.97, and the maximum field angle FOV is 83.4°.

[0107] 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.

[0108] Table 1

[0109]

[0110] 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 14 represent the image side or object side S1 to S14 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:

[0111]

[0112] 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 110, 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.

[0113] Table 2

[0114]

[0115] in addition, Figure 2 The optical system 100 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), which indicates the deviation of the convergence focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram indicates the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa indicates the distance (in mm) from the imaging plane to the intersection of the light and the optical axis 110. It can be seen from the longitudinal spherical aberration diagram that the degree of deviation of the convergence focus of light of each wavelength in the first embodiment tends to be consistent, and the diffuse spots or color halos in the imaging picture are effectively suppressed. Figure 2 Also included is a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical system 100, where the S curve represents the sagittal field curvature at 555nm, and the T curve represents the meridian field curvature at 555nm. As can be seen from the figure, the field curvature of the system is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear imaging. Figure 2 The optical system 100 also includes a distortion diagram (DISTORTION). It can be seen from the diagram that the image deformation caused by the main light beam is small and the imaging quality of the system is excellent.

[0116] Second embodiment

[0117] 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 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.

[0118] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0119] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0120] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0121] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0122] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0123] The image side surface S6 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0124] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0125] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0126] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0127] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0128] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0129] The image-side surface S12 of the sixth lens L6 is concave at the paraxial position and is convex at the circumference.

[0130] 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 , and the sixth lens L6 are all aspherical surfaces.

[0131] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 and the sixth lens L6 are all made of plastic.

[0132] 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.

[0133] Table 3

[0134]

[0135] 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.

[0136] Table 4

[0137]

[0138] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0139] f*tan(HFOV) 5.34 CT2 0.338 TTL / Imgh 1.28 R9 / R11 0.56 f2 / f6 2.58 TTL / f 1.171 FNO 1.95 ET4 0.46 |SAG51 / CT5| 0.69

[0140] In addition, by Figure 4 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0141] Third embodiment

[0142] 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 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.

[0143] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0144] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0145] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0146] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0147] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0148] The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

[0149] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0150] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0151] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0152] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0153] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0154] The image-side surface S12 of the sixth lens L6 is concave at the paraxial position and is convex at the circumference.

[0155] 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 , and the sixth lens L6 are all aspherical surfaces.

[0156] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 and the sixth lens L6 are all made of plastic.

[0157] 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.

[0158] Table 5

[0159]

[0160] 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.

[0161] Table 6

[0162]

[0163]

[0164] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0165] f*tan(HFOV) 5.34 CT2 0.300 TTL / Imgh 1.28 R9 / R11 0.60 f2 / f6 2.04 TTL / f 1.174 FNO 1.89 ET4 0.42 |SAG51 / CT5| 0.55

[0166] In addition, by Figure 6 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0167] Fourth embodiment

[0168] See also Figure 7 and Figure 8 , Figure 7 is a schematic diagram of an optical system 100 in a 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 negative refractive power, and a sixth lens L6 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.

[0169] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0170] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0171] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0172] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0173] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0174] The image side surface S6 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0175] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0176] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0177] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0178] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0179] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0180] The image-side surface S12 of the sixth lens L6 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 , and the sixth lens L6 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 and the sixth lens L6 are all made of plastic.

[0183] 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.

[0184] Table 7

[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 8, and the definition of each parameter therein can be obtained from the first embodiment, which will not be repeated here.

[0187] Table 8

[0188]

[0189]

[0190] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0191] f*tan(HFOV) 5.36 CT2 0.300 TTL / Imgh 1.28 R9 / R11 1.45 f2 / f6 0.86 TTL / f 1.174 FNO 1.95 ET4 0.44 |SAG51 / CT5| 0.61

[0192] In addition, by Figure 8 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0193] Fifth embodiment

[0194] See also Fig. 9 and Fig.10 , Fig. 9is 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 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, and a sixth lens L6 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.

[0195] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0196] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0197] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0198] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0199] The object side surface S5 of the third lens L3 is convex at the paraxial position and concave at the circumference;

[0200] The image side surface S6 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0201] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0202] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0203] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0204] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0205] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0206] The image-side surface S12 of the sixth lens L6 is concave at the paraxial position and is convex at the circumference.

[0207] 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 , and the sixth lens L6 are all aspherical surfaces.

[0208] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 and the sixth lens L6 are all made of plastic.

[0209] 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.

[0210] Table 9

[0211]

[0212]

[0213] 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.

[0214] Table 10

[0215]

[0216]

[0217] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0218] f*tan(HFOV) 5.34 CT2 0.333 TTL / Imgh 1.28 R9 / R11 0.63 f2 / f6 2.48 TTL / f 1.174 FNO 1.95 ET1 0.55 |SAG51 / CT5| 0.58

[0219] In addition, by Fig.10 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0220] Sixth embodiment

[0221] 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 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, and a sixth lens L6 with negative 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.

[0222] The object side surface S1 of the first lens L1 is convex at the paraxial position and convex at the circumference;

[0223] The image side surface S2 of the first lens L1 is concave at the paraxial position and concave at the circumference;

[0224] The object side surface S3 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0225] The image side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0226] The object side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference;

[0227] The image side surface S6 of the third lens L3 is convex at the paraxial position and convex at the circumference;

[0228] The object side surface S7 of the fourth lens L4 is concave at the paraxial position and is concave at the circumference;

[0229] The image side surface S8 of the fourth lens L4 is convex at the paraxial position and convex at the circumference;

[0230] The object side surface S9 of the fifth lens L5 is convex at the paraxial position and concave at the circumference;

[0231] The image-side surface S10 of the fifth lens L5 is concave at the paraxial position and convex at the circumference;

[0232] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position and concave at the circumference;

[0233] The image-side surface S12 of the sixth lens L6 is concave at the paraxial position and is convex at the circumference.

[0234] 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 , and the sixth lens L6 are all aspherical surfaces.

[0235] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 and the sixth lens L6 are all made of plastic.

[0236] 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.

[0237] Table 11

[0238]

[0239]

[0240] 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.

[0241] Table 12

[0242]

[0243] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0244] f*tan(HFOV) 5.37 CT2 0.306 TTL / Imgh 1.28 R9 / R11 0.52 f2 / f6 3.07 TTL / f 1.174 FNO 1.95 ET4 0.48 |SAG51 / CT5| 0.53

[0245] In addition, by Fig.12 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.

[0246] See also Fig.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 arranged between the image side surface 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 device (CMOS Sensor). The above optical system 100 is used in the imaging module 200, and the optical system 100 has the characteristics of a large image plane, which is conducive to the imaging module 200 having the characteristics of high pixels and high definition.

[0247] See also Fig.13 and Fig.14 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. When the electronic device 300 is a smart phone, the housing 310 can be the middle frame of the electronic device 300. By using the imaging module 200 in the electronic device 300, the optical system 100 has the characteristics of a large image plane, which is conducive to the electronic device 300 having the characteristics of high pixels and high definition, and meeting the requirements of high imaging quality.

[0248] 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.

[0249] 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 is composed of six lenses with refractive power, and includes, from the object side to the image side: A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the paraxial position, and the image side surface of the first lens is concave at the paraxial position; a second lens having negative refractive power, wherein the object side surface of the second lens is convex at the paraxial position, and the image side surface of the second lens is concave at the paraxial position; a third lens having refractive power; a fourth lens having refractive power, wherein the object side surface of the fourth lens is concave at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; a fifth lens having a refractive power, wherein the object side surface of the fifth lens is a convex surface at the paraxial position, and the image side surface of the fifth lens is a concave surface at the paraxial position; a sixth lens having negative refractive power, wherein the object side surface of the sixth lens is convex at the paraxial position, and the image side surface of the sixth lens is concave at the paraxial position; And the optical system satisfies the following conditional formula: ,TTL / ImgH≤1.3; Wherein, f is the effective focal length of the optical system, HFOV is half of the maximum field of view of the optical system, 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 image height corresponding to the maximum field of view of the optical system.

2. The optical system according to claim 1, characterized in that The following conditions are met: 0.5≤f2 / f6≤3.5; Wherein, f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens.

3. The optical system according to claim 1, characterized in that The following conditions are met: 1.89≤FNO≤2; Wherein, FNO is the aperture number of the optical system.

4. The optical system according to claim 1, characterized in that The following conditions are met: 0.3mm≤CT2≤0.35mm; Wherein, CT2 is the thickness of the second lens on the optical axis.

5. The optical system according to claim 1, characterized in that The following conditions are met: 0.5≤R9 / R11≤1.5; Wherein, R9 is the curvature radius of the object side of the fifth lens at the optical axis, and R11 is the curvature radius of the object side of the sixth lens at the optical axis.

6. The optical system according to claim 1, characterized in that The following conditions are met: 1.0≤TTL / f≤1.2; 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.

7. The optical system according to claim 1, characterized in that The following conditions are met: 0.3≤|SAG51 / CT5|≤1.0; Wherein, SAG51 is the sagittal height of the object side surface of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis.

8. The optical system according to claim 1, characterized in that The following conditions are met: ET4≥0.4mm; ET4 is the distance from the maximum effective aperture of the object side surface of the fourth lens to the maximum effective aperture of the image side surface of the fourth lens in the optical axis direction.

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

10. An electronic device, characterized in that: It comprises a shell and the imaging module as claimed in claim 9, wherein the imaging module is arranged in the shell.

Images