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, the object side surface being convex at the paraxial region and the image side surface being concave at the paraxial region; a second lens and a third lens having refractive powers; a fourth lens having a positive refractive power, the image side surface being convex at the paraxial region; a fifth lens having a refractive power, the image side surface being convex at the paraxial region; a sixth lens having a refractive power; and a seventh lens having a negative refractive power, the image side surface being concave at the paraxial region. The optical system satisfies the conditional formula: SD1 / f < 0.35; SD1 is half of the maximum effective aperture of the object side surface of the first lens, and f is the total effective focal length of the optical system. For the above optical system, when the above relational expression is satisfied, the head of the camera lens can be made smaller, and when under-screen packaging is adopted, the requirements for a high screen-to-body ratio of a full-screen display can be met.

Description

Technical Field

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

[0002] With the rapid development of electronic devices such as smart phones, the application of encapsulating camera lenses under the screen is becoming more and more widespread. By adopting the method of under-screen encapsulation, a full-screen design can be realized, making the electronic device more beautiful. However, in current electronic devices, the head of the camera lens is relatively large, resulting in a large opening in the screen during under-screen encapsulation, and thus a low screen-to-body ratio of the screen, which affects the visual effect of the full screen. Summary of the Invention

[0003] Based on this, in view of the problem that the large head of the current camera lens affects the visual effect of the full screen, 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, the object side surface of the first lens is convex at the paraxial region, and the image side surface is concave at the paraxial region;

[0006] A second lens with refractive power;

[0007] A third lens with refractive power;

[0008] A fourth lens with positive refractive power, the image side surface of the fourth lens is convex at the paraxial region;

[0009] A fifth lens with refractive power, the image side surface of the fifth lens is convex at the paraxial region;

[0010] A sixth lens with refractive power;

[0011] A seventh lens with negative refractive power, the image side surface of the seventh lens is concave at the paraxial region;

[0012] And the optical system satisfies the following conditional formula:

[0013] SD1 / f < 0.35;

[0014] Wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, and f is the total effective focal length of the optical system.

[0015] For the above optical system, the first lens has a positive refractive power, which helps to shorten the overall length of the optical system. Moreover, the object side surface of the first lens is convex at the paraxial region, 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 and facilitating the miniaturization design of the optical system. When SD1 / f > 0.35, the head of the optical system is relatively large, which is not conducive to assembly, and when applied in an electronic device, it will result in a relatively large opening on the screen during under-screen packaging, thereby leading to a relatively low screen-to-body ratio of the screen and affecting the visual effect. When the above conditional formula is satisfied, the maximum effective aperture of the object side surface of the first lens and the total effective focal length of the optical system can be reasonably configured, so that the maximum effective aperture of the first lens is relatively small, which is conducive to the small head of the manufactured camera lens.

[0016] In one embodiment, the optical system satisfies the following conditional formula:

[0017] TTL / ImgH < 1.6;

[0018] 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, that is, the overall length of the optical system, and ImgH is half of the diagonal length of the effective pixel area of the optical system on the imaging surface. When the above conditional formula is satisfied, the overall length of the optical system and the diagonal length of the effective pixel area of the optical system on the imaging surface can be reasonably configured to shorten the overall length of the optical system, thereby meeting the requirements of the miniaturization design of the optical system.

[0019] In one embodiment, the optical system satisfies the following conditional formula:

[0020] 1 < f / R14 < 4.5;

[0021] Wherein, f is the total effective focal length of the optical system, and R14 is the curvature radius of the image side surface of the seventh lens at the optical axis. When the above conditional formula is satisfied, the total effective focal length of the optical system and the image side surface of the seventh lens can be reasonably configured, so that the optical system can better match the principal ray incident angle of the inner field of view on the photosensitive element, thereby improving the imaging quality of the optical system. Among them, the central field of view to the 0.5 field of view of the optical system is the inner field of view of the optical system.

[0022] In one embodiment, the optical system satisfies the following conditional formula:

[0023] -2 < f1_6 / f7 < -0.3;

[0024] Among them, f1_6 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, and f7 is the effective focal length of the seventh lens. When the above conditional expressions are satisfied, the values of f 16 and f7 can be reasonably allocated to better correct the chromatic aberration of the optical system and improve the imaging quality of the optical system.

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

[0026] TTL / f < 1.7;

[0027] Among them, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, and f is the total effective focal length of the optical system. When the above conditional expressions are satisfied, the overall length and the total effective focal length of the optical system can be reasonably configured to shorten the overall length of the optical system, thereby meeting the requirements of the miniaturized design of the optical system.

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

[0029] tan(FOV / 2) > 1;

[0030] Among them, FOV is the maximum field of view angle of the optical system, that is, tan(FOV / 2) is the tangent value of the maximum half field of view angle of the optical system. When the above conditional expressions are satisfied, the optical system has a larger field of view angle to achieve a large-angle shooting effect, so that the optical system can obtain more information about the object to be photographed to a greater extent and improve the user's camera experience.

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

[0032] (R2 + R1) / (R2 - R1) < 5;

[0033] Among them, R1 is the curvature radius of the object side surface of the first lens on the optical axis, and R2 is the curvature radius of the image side surface of the first lens on the optical axis. When the above conditional expressions are satisfied, the object side surface and the image side surface of the first lens can be reasonably configured to enhance the positive refractive power of the first lens, so that the first lens can better correct the chromatic aberration and spherical aberration of the optical system and improve the imaging quality of the optical system.

[0034] In one embodiment, the object side and the image side of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical surfaces. The adoption of the aspherical structure can improve the flexibility of lens design and effectively correct the spherical aberration of the optical system, thereby improving the imaging quality of the optical system.

[0035] An image capturing module includes a photosensitive element and the optical system according to any of the above embodiments. The photosensitive element is disposed on the image side of the optical system, and light forms an image on the photosensitive element after passing through the optical system. By adopting the above optical system in the image capturing module, the maximum effective aperture of the first lens can be made smaller, and thus the head of the camera lens made of the optical system can be made smaller, enabling the image capturing module to meet the requirements of a full-screen with a high screen-to-body ratio.

[0036] An electronic device includes a housing and the above image capturing module, and the image capturing module is disposed in the housing. By adopting the above image capturing module in the electronic device, the head of the camera lens in the electronic device is smaller and can meet the requirements of a full-screen with a high screen-to-body ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the optical system in the first embodiment of the present application;

[0038] Figure 2 Spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the first embodiment of the present application;

[0039] Figure 3 Schematic diagram of the optical system in the second embodiment of the present application;

[0040] Figure 4 Spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the second embodiment of the present application;

[0041] Figure 5 Schematic diagram of the optical system in the third embodiment of the present application;

[0042] Figure 6 Spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the third embodiment of the present application;

[0043] Figure 7 Schematic diagram of the optical system in the fourth embodiment of the present application;

[0044] Figure 8 Spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the fourth embodiment of the present application;

[0045] Figure 9 Schematic diagram of the optical system in the fifth embodiment of the present application;

[0046] Figure 10 The spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the fifth embodiment of the present application;

[0047] Figure 11 Schematic diagram of the optical system in the sixth embodiment of the present application;

[0048] Figure 12 The spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the sixth embodiment of the present application;

[0049] Figure 13 Schematic diagram of the optical system in the seventh embodiment of the present application;

[0050] Figure 14 The spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the seventh embodiment of the present application;

[0051] Figure 15 Schematic diagram of the optical system in the eighth embodiment of the present application;

[0052] Figure 16 The spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the eighth embodiment of the present application;

[0053] Figure 17 Schematic diagram of the image capture module in an embodiment of the present application;

[0054] Figure 18 Schematic diagram of the electronic device in an embodiment of the present application. Detailed implementation manners

[0055] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand 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 departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0057] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be 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, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be a middle 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 middle element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0061] 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, a sixth lens L6, and a seventh lens L7 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, the sixth lens L6 includes an object side surface S11 and an image side surface S12, and the seventh lens L7 includes an object side surface S13 and an image side surface S14. The optical system 100 can be disposed in a lens barrel to assemble and form a camera lens.

[0062] 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 convex at the paraxial region, which can further enhance the positive refractive power of the first lens L1, making the size of the optical system 100 in the optical axis direction shorter, and being beneficial to the miniaturization design of the optical system 100. The image side surface S2 of the first lens L1 is concave at the paraxial region. Both the second lens L2 and the third lens L3 have refractive powers. The fourth lens L4 has a positive refractive power, and the image side surface S8 of the fourth lens L4 is convex at the paraxial region. The fifth lens has a refractive power, and the image side surface S10 of the fifth lens L5 is convex at the paraxial region. The sixth lens L6 has a refractive power. The seventh lens L7 has a negative refractive power, and the image side surface S14 of the seventh lens L7 is concave at the paraxial region.

[0063] In addition, in some embodiments, the optical system 100 is provided with a stop STO, and the stop STO can be disposed on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L8 disposed on the image side of the seventh lens L7, and the infrared filter L8 includes an object side surface S15 and an image side surface S16. Further, the optical system 100 further includes an image plane S17 located on the image side of the seventh lens L7, and the image plane S17 is the imaging plane of the optical system 100. The incident light can be imaged on the image plane S17 after being adjusted by the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. It should be noted that the infrared filter L8 can be an infrared cut-off filter, which is used to filter out interfering light to prevent the interfering light from reaching the image plane S17 of the optical system 100 and affecting normal imaging.

[0064] In some embodiments, both the object side and the image side of each lens of the optical system 100 are aspherical surfaces. The adoption of the aspherical structure can improve the flexibility of lens design, effectively correct spherical aberration, and improve the imaging quality. In some other embodiments, both the object side and the image side of each lens of the optical system 100 can also 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 lenses in the optical system 100 can be any combination of aspherical or spherical surfaces.

[0065] In some embodiments, the materials of the lenses in the optical system 100 can all be glass or all be plastic. Using lenses made of plastic 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 miniaturized design of the optical system. While using lenses made of glass enables the optical system 100 to have excellent optical performance and high temperature resistance. It should be noted that the materials of the lenses 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.

[0066] It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there can also be two or more lenses in the first lens L1. The two or more lenses can form a cemented lens. The surface closest to the object side of the cemented lens 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. Or, the lenses in the first lens L1 do not form a cemented lens, but the distance between the lenses is 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, the sixth lens L6, or the seventh lens L7 in some embodiments can also be greater than or equal to two, and a cemented lens can be formed between any adjacent lenses, or they can be non-cemented lenses.

[0067] Furthermore, in some embodiments, the optical system 100 satisfies the conditional formula: SD1 / f < 0.35; where SD1 is half of the maximum effective aperture of the object side surface S1 of the first lens L1, and f is the total effective focal length of the optical system 100. Specifically, SD1 / f can be 0.22, 0.23, 0.24, 0.25, or 0.26. When SD1 / f > 0.35, the head of the optical system 100 is relatively large, which is not conducive to assembly, and when applied to an electronic device, it will cause a large opening in the screen during under-screen packaging, and then result in a low screen-to-body ratio of the screen, affecting the visual effect. When the above conditional formula is satisfied, the maximum effective aperture of the object side surface S1 of the first lens L1 and the total effective focal length of the optical system 100 can be reasonably configured, so that the maximum effective aperture of the first lens L1 is smaller, which is conducive to making the head of the imaging lens smaller.

[0068] In some embodiments, the optical system 100 satisfies the conditional expression: TTL / ImgH < 1.6; where 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, that is, the total system length of the optical system 100, and ImgH is half of the diagonal length of the effective pixel region of the optical system 100 on the imaging surface. Specifically, TTL / ImgH can be 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, or 1.51. When the above conditional expression is satisfied, the total system length of the optical system 100 and the diagonal length of the effective pixel region of the optical system 100 on the imaging surface can be reasonably configured to shorten the total system length of the optical system 100, thereby meeting the requirements of the miniaturized design of the optical system 100.

[0069] In some embodiments, the optical system 100 satisfies the conditional expression: 1 < f / R14 < 4.5; where f is the total effective focal length of the optical system 100, and R14 is the radius of curvature of the image side surface S14 of the seventh lens L7 at the optical axis. Specifically, f / R14 can be 2.64, 2.71, 2.77, 2.85, 2.94, 3.10, 3.21, 3.48, 3.51, or 3.55. When the above conditional expression is satisfied, the total effective focal length of the optical system 100 and the image side surface S14 of the seventh lens L7 can be reasonably configured so that the optical system 100 can better match the principal ray incident angle of the inner field of view on the photosensitive element, thereby improving the imaging quality of the optical system 100.

[0070] In some embodiments, the optical system 100 satisfies the conditional expression: -2 < f1_6 / f7 < -0.3; where f1_6 is the combined focal length 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, and f7 is the effective focal length of the seventh lens L7. Specifically, f 16 / f7 can be -1.35, -1.24,, 1.18, -1.13, -1.09, -1.01, -0.95, -0.83, -0.79, or -0.77. When the above conditional expression is satisfied, the values of f 16 and f7 can be reasonably allocated to better correct the chromatic aberration of the optical system 100 and improve the imaging quality of the optical system 100.

[0071] In some embodiments, the optical system 100 satisfies the conditional expression: TTL / f < 1.7; where TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface of the optical system 100 on the optical axis, and f is the total effective focal length of the optical system 100. Specifically, TTL / f can be 1.56, 1.57, 1.58, 1.61, 1.62, 1.63, 1.65, 1.67, 1.68, or 1.69. When the above conditional expression is satisfied, the overall length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the overall length of the optical system 100, thereby meeting the requirements of the miniaturized design of the optical system 100.

[0072] In some embodiments, the optical system 100 satisfies the conditional expression: tan(FOV / 2) > 1; where FOV is the maximum field of view angle of the optical system 100, that is, tan(FOV / 2) is the tangent value of the maximum half field of view angle of the optical system 100. Specifically, tan(FOV / 2) can be 1.25, 1.26, 1.27, or 1.28. When the above conditional expression is satisfied, the optical system 100 has a larger field of view angle to achieve a large-angle shooting effect, thereby enabling the optical system 100 to obtain more information about the object to be photographed to a greater extent and enhancing the user's camera experience.

[0073] In some embodiments, the optical system 100 satisfies the conditional expression: (R2 + R1) / (R2 - R1) < 5; where R1 is the radius of curvature of the object side surface S1 of the first lens L1 on the optical axis, and R2 is the radius of curvature of the image side surface S2 of the first lens L1 on the optical axis. Specifically, (R2 + R1) / (R2 - R1) can be 1.91, 1.98, 2.02, 2.06, 2.15, 2.26, 2.32, 2.47, 2.56, or 2.67. When the above conditional expression is satisfied, the object side surface S1 and the image side surface S2 of the first lens L1 can be reasonably configured to enhance the positive refractive power of the first lens L1, thereby enabling the first lens L1 to better correct the chromatic aberration and spherical aberration of the optical system 100 and improving the imaging quality of the optical system 100.

[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 1Schematic diagram of the optical system 100 in the first 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 positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with negative refractive power from the object side to the image side. Figure 2 From left to right are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the first embodiment. The reference wavelengths for the astigmatism graph and the distortion graph are both 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 concave at the paraxial region and convex at the circumference.

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

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

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

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

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

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

[0085] The object side surface S9 of the fifth lens L5 is concave at the paraxial region and concave at the circumference.

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

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

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

[0089] The object side surface S13 of the seventh lens L7 is convex at the paraxial region and convex at the circumference.

[0090] The image side surface S14 of the seventh lens L7 is concave at the paraxial region and concave at the circumference.

[0091] The object side and the image side of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are both aspherical surfaces.

[0092] 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), it can be understood that the region of this surface near the optical axis is convex. When it is described that a surface of a lens is concave at the circumference, it can be understood that the region of this surface near the maximum effective radius is concave. For example, when this surface is convex at the optical axis and also convex at the circumference, the shape of this 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 that first transitions to a concave surface shape and then becomes convex when approaching the maximum effective radius. This is only an example given to illustrate the relationship between the optical axis and the circumference, and various shape structures (concave-convex relationships) of the surface are not fully reflected, but other situations can be deduced based on the above examples.

[0093] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastics.

[0094] Furthermore, the optical system 100 satisfies the conditional formula: SD1 / f = 0.22; where SD1 is half of the maximum effective aperture of the object side S1 of the first lens L1, and f is the total effective focal length of the optical system 100. When SD1 / f > 0.35, the head of the optical system 100 is relatively large, which is not conducive to assembly, and when applied to an electronic device, it will cause a relatively large opening in the screen during under-screen packaging, resulting in a relatively low screen-to-body ratio of the screen and affecting the visual effect. When the above conditional formula is satisfied, the maximum effective aperture of the object side S1 of the first lens L1 and the total effective focal length of the optical system 100 can be reasonably configured, so that the maximum effective aperture of the first lens L1 is relatively small, which is conducive to the head of the manufactured camera lens being relatively small.

[0095] The optical system 100 satisfies the conditional formula: TTL / ImgH = 1.41; where TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface of the optical system 100, that is, the total system length of the optical system 100, 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 conditional formula is satisfied, the total system length of the optical system 100 and the diagonal length of the effective pixel region on the imaging surface of the optical system 100 can be reasonably configured to shorten the total system length of the optical system 100, thereby meeting the requirements of the miniaturized design of the optical system 100.

[0096] The optical system 100 satisfies the conditional formula: f / R14 = 3.39; where f is the total effective focal length of the optical system 100, and R14 is the radius of curvature of the image side S14 of the seventh lens L7 on the optical axis. When the above conditional formula is satisfied, the total effective focal length of the optical system 100 and the image side S14 of the seventh lens L7 can be reasonably configured so that the optical system 100 can better match the principal ray incident angle of the inner field of view on the photosensitive element, thereby improving the imaging quality of the optical system 100.

[0097] The optical system 100 satisfies the conditional formula: f1_6 / f7 = -0.77; where f1_6 is the combined focal length 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, and f7 is the effective focal length of the seventh lens L7. When the above conditional formula is satisfied, the values of f 16 and f7 can be reasonably allocated to better correct the chromatic aberration of the optical system 100 and improve the imaging quality of the optical system 100.

[0098] The optical system 100 satisfies the conditional formula: TTL / f = 1.56; where TTL is the distance from the object side S1 of the first lens L1 to the imaging plane of the optical system 100 on the optical axis, and f is the total effective focal length of the optical system 100. When the above conditional formula is satisfied, the overall length and the total effective focal length of the optical system 100 can be reasonably configured to shorten the overall length of the optical system 100, thereby meeting the requirements of the miniaturized design of the optical system 100.

[0099] The optical system 100 satisfies the conditional formula: tan(FOV / 2) = 1.26; where FOV is the maximum field of view angle of the optical system 100, that is, tan(FOV / 2) is the tangent value of the maximum half field of view angle of the optical system 100. When the above conditional formula is satisfied, the optical system 100 has a larger field of view angle to achieve a large-angle shooting effect, so that the optical system 100 can obtain more information about the object to be photographed to a greater extent and improve the user's shooting experience.

[0100] The optical system 100 satisfies the conditional formula: (R2 + R1) / (R2 - R1) = 2.35; where R1 is the radius of curvature of the object side S1 of the first lens L1 on the optical axis, and R2 is the radius of curvature of the image side S2 of the first lens L1 on the optical axis. When the above conditional formula is satisfied, the object side S1 and the image side S2 of the first lens L1 can be reasonably configured to enhance the positive refractive power of the first lens L1, so that the first lens L1 can better correct the chromatic aberration and spherical aberration of the optical system 100 and improve the imaging quality of the optical system 100.

[0101] In addition, the parameters of the optical system 100 are given in Table 1. Among them, the image plane S17 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 S17 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 corresponding to the 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.

[0102] It should be noted that in this embodiment and the following embodiments, the optical system 100 may not be provided with an infrared filter L8, but in this case, the distance from the image side S14 of the seventh lens L7 to the image plane S17 remains unchanged.

[0103] In the first embodiment, the total effective focal length f of the optical system 100 is 2.75 mm, the f-number FNO is 2.30, the maximum field of view FOV is 103.28°, and the total system length TTL of the optical system 100 is 4.30 mm.

[0104] Moreover, the focal lengths of the lenses are the values at a wavelength of 555 nm, and the refractive indices and Abbe numbers of the lenses are the values at the d-line (587.56 nm). The same applies to other embodiments.

[0105] Table 1

[0106]

[0107] 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 - S14 respectively. And K - A20 from top to bottom represent the types of aspheric coefficients. Among them, K represents the conic 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 aspheric coefficient formula is as follows:

[0108]

[0109] Among them, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface formula.

[0110] Table 2

[0111]

[0112] Second Embodiment

[0113] Please refer to Figure 3 and Figure 4 , Figure 3 which 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 positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with negative refractive power from the object side to the image side. Figure 4 From left to right are the graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the second embodiment.

[0114] The object side surface S1 of the first lens L1 is convex at the paraxial region and concave at the periphery;

[0115] The image side surface S2 of the first lens L1 is concave at the paraxial region and convex at the periphery;

[0116] The object side surface S3 of the second lens L2 is concave at the paraxial region and convex at the periphery;

[0117] The image side surface S4 of the second lens L2 is convex at the paraxial region and concave at the periphery;

[0118] The object side surface S5 of the third lens L3 is concave at the paraxial region and convex at the periphery;

[0119] The image side surface S6 of the third lens L3 is concave at the paraxial region and concave at the periphery;

[0120] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and concave at the periphery;

[0121] The image side surface S8 of the fourth lens L4 is convex at the paraxial region and convex at the periphery;

[0122] The object side surface S9 of the fifth lens L5 is concave at the paraxial region and concave at the periphery;

[0123] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the periphery;

[0124] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the periphery;

[0125] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the periphery;

[0126] The object side surface S13 of the seventh lens L7 is convex at the paraxial region and convex at the periphery;

[0127] The image side S14 of the seventh lens L7 is concave at the paraxial region and concave at the circumference.

[0128] The object sides and image sides of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 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, the sixth lens L6, and the seventh lens L7 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 and will not be elaborated here.

[0131] Table 3

[0132]

[0133] Furthermore, the aspherical coefficients of the image sides or object sides 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 and will not be elaborated here.

[0134] Table 4

[0135]

[0136]

[0137] And, based on the parameter information provided above, the following relationships can be deduced:

[0138]

[0139] Third Embodiment

[0140] Please refer to Figure 5 and Figure 6 , Figure 5 which are schematic diagrams 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 positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 6 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the third embodiment.

[0141] The object side S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0142] The image side S2 of the first lens L1 is concave at the paraxial region and convex at the peripheral region;

[0143] The object side S3 of the second lens L2 is concave at the paraxial region and convex at the peripheral region;

[0144] The image side S4 of the second lens L2 is convex at the paraxial region and concave at the peripheral region;

[0145] The object side S5 of the third lens L3 is convex at the paraxial region and convex at the peripheral region;

[0146] The image side S6 of the third lens L3 is concave at the paraxial region and concave at the peripheral region;

[0147] The object side S7 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0148] The image side S8 of the fourth lens L4 is convex at the paraxial region and concave at the peripheral region;

[0149] The object side S9 of the fifth lens L5 is concave at the paraxial region and concave at the peripheral region;

[0150] The image side S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0151] The object side S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0152] The image side S12 of the sixth lens L6 is convex at the paraxial region and concave at the peripheral region;

[0153] The object side S13 of the seventh lens L7 is concave at the paraxial region and convex at the peripheral region;

[0154] The image side S14 of the seventh lens L7 is concave at the paraxial region and concave at the peripheral region.

[0155] The object sides and image sides of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all aspherical surfaces.

[0156] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastics.

[0157] 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.

[0158] Table 5

[0159]

[0160]

[0161] Furthermore, the aspherical coefficients of each lens image side or object side of the optical system 100 are given in Table 6, and the definitions of each parameter therein can be obtained from the first embodiment, which will not be elaborated here.

[0162] Table 6

[0163]

[0164]

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

[0166]

[0167] Fourth Embodiment

[0168] 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 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 positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 8 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the fourth embodiment.

[0169] The object side S1 of the first lens L1 is convex near the axis and concave at the circumference;

[0170] The image side S2 of the first lens L1 is concave near the axis and convex at the circumference;

[0171] The object side S3 of the second lens L2 is concave near the axis and convex at the circumference;

[0172] The image side S4 of the second lens L2 is convex near the axis and concave at the circumference;

[0173] The object side S5 of the third lens L3 is convex near the axis and convex at the circumference;

[0174] The image side S6 of the third lens L3 is concave near the axis and convex at the circumference;

[0175] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0176] The image side surface S8 of the fourth lens L4 is convex at the paraxial region and concave at the peripheral region;

[0177] The object side surface S9 of the fifth lens L5 is concave at the paraxial region and concave at the peripheral region;

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

[0179] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0180] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and convex at the peripheral region;

[0181] The object side surface S13 of the seventh lens L7 is convex at the paraxial region and convex at the peripheral region;

[0182] The image side surface S14 of the seventh lens L7 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, the sixth lens L6, and the seventh lens L7 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, the sixth lens L6, and the seventh lens L7 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 and will not be elaborated here.

[0186] Table 7

[0187]

[0188]

[0189] 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 and will not be elaborated here.

[0190] Table 8

[0191]

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

[0193]

[0194] Fifth Embodiment

[0195] Please refer to Figure 9 and Figure 10 , Figure 9 FIG. 12 is a schematic diagram of the optical system 100 in the fifth embodiment. The optical system 100 includes, in order from the object side to the image side, a stop STO, a first lens L1 having a positive refractive power, a second lens L2 having a positive refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a seventh lens L7 having a negative refractive power. Figure 10 FIG. 13 shows graphs of spherical aberration, astigmatism, and distortion of the optical system 100 in the fifth embodiment from left to right in sequence.

[0196] The object surface S1 of the first lens L1 is convex at the paraxial region and concave at the peripheral region;

[0197] The image surface S2 of the first lens L1 is concave at the paraxial region and convex at the peripheral region;

[0198] The object surface S3 of the second lens L2 is concave at the paraxial region and concave at the peripheral region;

[0199] The image surface S4 of the second lens L2 is convex at the paraxial region and concave at the peripheral region;

[0200] The object surface S5 of the third lens L3 is convex at the paraxial region and convex at the peripheral region;

[0201] The image surface S6 of the third lens L3 is concave at the paraxial region and convex at the peripheral region;

[0202] The object surface S7 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0203] The image surface S8 of the fourth lens L4 is convex at the paraxial region and concave at the peripheral region;

[0204] The object surface S9 of the fifth lens L5 is concave at the paraxial region and concave at the peripheral region;

[0205] The image surface S10 of the fifth lens L5 is convex at the paraxial region and concave at the peripheral region;

[0206] The object surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0207] The image surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region;

[0208] The object side S13 of the seventh lens L7 is convex at the paraxial region and convex at the periphery;

[0209] The image side S14 of the seventh lens L7 is concave at the paraxial region and concave at the periphery.

[0210] The object sides and image sides of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 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, the sixth lens L6, and the seventh lens L7 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 and will not be elaborated here.

[0213] Table 9

[0214]

[0215]

[0216] Furthermore, the aspherical coefficients of the image sides or object sides 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 and will not be elaborated here.

[0217] Table 10

[0218]

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

[0220]

[0221] Sixth Embodiment

[0222] 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 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 positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, and a seventh lens L7 with negative refractive power. Figure 12 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the sixth embodiment.

[0223] The object side surface S1 of the first lens L1 is convex at the paraxial region and concave at the peripheral region;

[0224] The image side surface S2 of the first lens L1 is concave at the paraxial region and convex at the peripheral region;

[0225] The object side surface S3 of the second lens L2 is convex at the paraxial region and concave at the peripheral region;

[0226] The image side surface S4 of the second lens L2 is convex at the paraxial region and concave at the peripheral region;

[0227] The object side surface S5 of the third lens L3 is concave at the paraxial region and convex at the peripheral region;

[0228] The image side surface S6 of the third lens L3 is concave at the paraxial region and concave at the peripheral region;

[0229] The object side surface S7 of the fourth lens L4 is convex at the paraxial region and convex at the peripheral region;

[0230] The image side surface S8 of the fourth lens L4 is convex at the paraxial region and concave at the peripheral region;

[0231] The object side surface S9 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0232] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0233] The object side surface S11 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region;

[0234] The image side surface S12 of the sixth lens L6 is convex at the paraxial region and concave at the peripheral region;

[0235] The object side surface S13 of the seventh lens L7 is concave at the paraxial region and concave at the peripheral region;

[0236] The image side surface S14 of the seventh lens L7 is concave at the paraxial region and convex at the peripheral region.

[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, the sixth lens L6, and the seventh lens L7 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, the sixth lens L6, and the seventh lens L7 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, which will not be elaborated here.

[0240] Table 11

[0241]

[0242] Furthermore, the aspherical coefficients of each lens image side or object side of the optical system 100 are given in Table 12, and the definitions of each parameter therein can be obtained from the first embodiment, which will not be elaborated here.

[0243] Table 12

[0244]

[0245]

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

[0247]

[0248] Seventh Embodiment

[0249] Please refer to Figure 13 and Figure 14 , Figure 13 which are schematic diagrams of the optical system 100 in the seventh 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 positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with negative refractive power. Figure 14 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the seventh embodiment.

[0250] The object side S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0251] The image side S2 of the first lens L1 is concave at the paraxial region and convex at the circumference;

[0252] The object side S3 of the second lens L2 is convex at the paraxial region and concave at the circumference;

[0253] The image side S4 of the second lens L2 is concave at the paraxial region and concave at the circumference;

[0254] The object side S5 of the third lens L3 is convex at the paraxial region and concave at the circumference;

[0255] The image side S6 of the third lens L3 is convex at the paraxial region and concave at the circumference;

[0256] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and convex at the peripheral region;

[0257] The image side surface S8 of the fourth lens L4 is convex at the paraxial region and concave at the peripheral region;

[0258] The object side surface S9 of the fifth lens L5 is concave at the paraxial region and convex at the peripheral region;

[0259] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the peripheral region;

[0260] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the peripheral region;

[0261] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the peripheral region;

[0262] The object side surface S13 of the seventh lens L7 is convex at the paraxial region and convex at the peripheral region;

[0263] The image side surface S14 of the seventh lens L7 is concave at the paraxial region and concave at the peripheral region.

[0264] 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, the sixth lens L6, and the seventh lens L7 are all aspherical surfaces.

[0265] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastics.

[0266] In addition, the parameters of the optical system 100 are given in Table 13, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0267] Table 13

[0268]

[0269] 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 14, and the definitions of the parameters can be obtained from the first embodiment, which will not be elaborated here.

[0270] Table 14

[0271]

[0272]

[0273] Moreover, based on the parameter information provided above, the following relationships can be deduced:

[0274]

[0275] Eighth Embodiment

[0276] Please refer to Figure 15 and Figure 16 , Figure 15 FIG. Figure 15 is a schematic diagram of the optical system 100 in the eighth 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 positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with negative refractive power from the object side to the image side. Figure 16 From left to right are the curves of spherical aberration, astigmatism, and distortion of the optical system 100 in the eighth embodiment.

[0277] The object side surface S1 of the first lens L1 is convex at the paraxial region and convex at the circumference;

[0278] The image side surface S2 of the first lens L1 is concave at the paraxial region and convex at the circumference;

[0279] The object side surface S3 of the second lens L2 is convex at the paraxial region and concave at the circumference;

[0280] The image side surface S4 of the second lens L2 is concave at the paraxial region and convex at the circumference;

[0281] The object side surface S5 of the third lens L3 is convex at the paraxial region and concave at the circumference;

[0282] The image side surface S6 of the third lens L3 is concave at the paraxial region and concave at the circumference;

[0283] The object side surface S7 of the fourth lens L4 is concave at the paraxial region and convex at the circumference;

[0284] The image side surface S8 of the fourth lens L4 is convex at the paraxial region and concave at the circumference;

[0285] The object side surface S9 of the fifth lens L5 is concave at the paraxial region and convex at the circumference;

[0286] The image side surface S10 of the fifth lens L5 is convex at the paraxial region and convex at the circumference;

[0287] The object side surface S11 of the sixth lens L6 is convex at the paraxial region and convex at the circumference;

[0288] The image side surface S12 of the sixth lens L6 is concave at the paraxial region and concave at the circumference;

[0289] The object side S13 of the seventh lens L7 is convex at the paraxial region and convex at the periphery;

[0290] The image side S14 of the seventh lens L7 is concave at the paraxial region and concave at the periphery.

[0291] The object sides and image sides of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all aspherical surfaces.

[0292] The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastics.

[0293] In addition, the parameters of the optical system 100 are given in Table 15, and the definitions of the parameters can be obtained from the first embodiment and will not be elaborated here.

[0294] Table 15

[0295]

[0296]

[0297] Furthermore, the aspherical coefficients of the image sides or object sides of the lenses of the optical system 100 are given in Table 16, and the definitions of the parameters can be obtained from the first embodiment and will not be elaborated here.

[0298] Table 16

[0299]

[0300]

[0301] And, based on the parameter information provided above, the following relationships can be deduced:

[0302]

[0303] Please refer to Figure 17, 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 S17 of the optical system 100. The imaging module 200 can also be provided with an infrared filter L8, and the infrared filter L8 is disposed between the image side surface S14 of the seventh lens L7 and the image plane S17. Specifically, the photosensitive element 210 can be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor). By adopting the above optical system 100 in the imaging module 200, the maximum effective aperture of the first lens L1 can be made smaller, and thus the head of the camera lens made of the optical system 100 can be made smaller. Therefore, when the camera lens is disposed in the electronic device by means of under-screen packaging, the screen opening of the electronic device is smaller, which is beneficial to improving the screen-to-body ratio of the electronic device to meet the requirements of a full-screen with a high screen-to-body ratio.

[0304] Please refer to Figure 17 and Figure 18 , 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 disposed in the housing 310. Specifically, the electronic device 300 can be, but is not limited to, a portable telephone, a video phone, a smart phone, an e-book reader, an in-vehicle camera device such as a driving recorder, or a wearable device such as a smart watch. By adopting the imaging module 200 in the electronic device 300, since the head of the camera lens made of the imaging module 200 is smaller, when it is installed by means of under-screen packaging, the screen opening of the electronic device 300 is smaller, and the requirements of a full-screen with a high screen-to-body ratio can be met.

[0305] 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 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 described in this specification.

[0306] The above-described embodiments only 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 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 seven 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 is convex at the paraxial region, and the image side surface is concave at the paraxial region; A second lens with refractive power; A third lens with refractive power; A fourth lens with positive refractive power, the image side surface of the fourth lens is convex at the paraxial region; A fifth lens with refractive power, the image side surface of the fifth lens is convex at the paraxial region; A sixth lens with refractive power; A seventh lens with negative refractive power, the image side surface of the seventh lens is concave at the paraxial region; And the optical system satisfies the following conditional expressions: 0.22 ≤ SD1 / f < 0.35; 1 < f / R14 < 4.5; 1.56 ≤ TTL / f < 1.7; Wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, f is the total effective focal length of the optical system, R14 is the curvature radius of the image side surface of the seventh lens on the optical axis, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical system.

2. The optical system according to claim 1, wherein Satisfies the following conditional expression: 1.41 ≤ TTL / ImgH < 1.6; Wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical system, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical system.

3. The optical system according to claim 1, characterized in that, Satisfies the following conditional expression: -2 < f1_6 / f7 < -0.3; Wherein, f1_6 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens.

4. The optical system according to claim 1, wherein Satisfies the following conditional expression: 1.28 > tan(FOV / 2) > 1; Wherein, FOV is the maximum field of view angle of the optical system.

5. The optical system according to claim 1, characterized in that, Satisfies the following conditional expression: 1.91 < (R2 + R1) / (R2 - R1) < 5; Wherein, R1 is the curvature radius of the object side surface of the first lens on the optical axis, and R2 is the curvature radius of the image side surface of the first lens on the optical axis.

6. The optical system according to claim 1, characterized in that, The object side surfaces and image side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical surfaces.

7. An imaging module, characterized in that, It includes a photosensitive element and the optical system according to any one of claims 1 - 6, the photosensitive element is arranged on the image side of the optical system, and light forms an image on the photosensitive element after passing through the optical system.

8. An electronic device, characterized in that, It includes a housing and the imaging module according to claim 7, and the imaging module is arranged in the housing.

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