Optical systems, camera modules and electronic devices

Abstract

The present invention relates to an optical system, a camera module and an electronic device. The optical system includes, from the object side to the image side, in order: an aperture; a first lens with positive refractive power; a second lens with negative refractive power, the object side surface of the second lens is convex at the paraxial part; a third lens, a fourth lens and 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 part; and the optical system satisfies the relationship: (TTL-BFL) / f<0.92; 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, BFL is the shortest distance from the image side surface of the sixth lens to the imaging surface of the optical system in the direction parallel to the optical axis, and f is the effective focal length of the optical system. When the above relationship is satisfied, the distribution of the lenses in the optical system in space can be reasonably allocated, and the optical system can be ultra-thin in design while achieving high pixels.

Description

Technical Field

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

[0002] Technological advancements have led to the emergence of a wide variety of portable electronic devices capable of recording images. However, as consumer demand for high-quality images continues to rise, existing three-, four-, and five-element camera modules are facing technical bottlenecks. To achieve higher image clarity based on the same chip, more lenses with complex surface shapes are typically used to eliminate aberrations. However, this structure undoubtedly increases the overall length of the camera module, hindering its miniaturization. Summary of the Invention

[0003] Based on this, it is necessary to provide an optical system, a camera module and an electronic device to solve the problem of how to achieve miniaturized design of the camera module.

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

[0005] Aperture;

[0006] a first lens element having positive refractive power;

[0007] a second lens having negative refractive power, wherein the object-side surface of the second lens is convex at the paraxial position;

[0008] a third lens having refractive power;

[0009] a fourth lens having refractive power;

[0010] a fifth lens having refractive power;

[0011] a sixth lens element having negative refractive power, wherein the image-side surface of the sixth lens element is concave at the paraxial position;

[0012] And the optical system satisfies the relationship:

[0013] (TTL-BFL) / f<0.92;

[0014] Wherein, TTL is the distance from the object side surface of the first lens to the imaging plane of the optical system on the optical axis, BFL is the shortest distance from the image side surface of the sixth lens to the imaging plane of the optical system in a direction parallel to the optical axis, and f is the effective focal length of the optical system.

[0015] In the above optical system, when the first lens has a positive refractive power, it will help shorten the total optical length of the optical system. When the above relationship is satisfied, the distribution of the lenses in the optical system in space can be reasonably allocated, so that the optical system can achieve an ultra-thin design while achieving high pixels.

[0016] In one embodiment, the optical system satisfies the relationship:

[0017] 1mm≤(SAG11+SAG21)*f / EPD≤2mm;

[0018] Where SAG11 is the sag height of the object-side surface of the first lens, SAG21 is the sag height of the object-side surface of the second lens, and EPD is the entrance pupil diameter of the optical system. Meeting this relationship effectively increases the light throughput of the optical system, thereby highlighting the imaging subject, while also facilitating the manufacturing of the optical system while maintaining high resolution.

[0019] In one embodiment, the optical system satisfies the relationship:

[0020] SAG21 / CT2≤0.5;

[0021] Wherein, SAG21 is the sag height of the object side surface of the second lens, and CT2 is the center thickness of the second lens. When the above relationship is satisfied, it is beneficial to reduce the processing sensitivity of the second lens and balance the field curvature of the optical system.

[0022] In one embodiment, the optical system satisfies the relationship:

[0023] ∑CT / T214≤1;

[0024] Where ΣCT is the sum of the center thicknesses of all lenses in the optical system, and T214 is the distance along the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens. Satisfying this relationship allows for a more compact optical system structure and improved lens assembly processes by rationally arranging the thicknesses of the lenses in the optical system.

[0025] In one embodiment, the optical system satisfies the relationship:

[0026] 1≤ET2 / CT2≤2;

[0027] Wherein, ET2 is the edge thickness of the second lens, and CT2 is the center thickness of the second lens. When the above relationship is satisfied, it is beneficial to reduce stray light in the optical system and improve imaging quality.

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

[0029] (CT3+CT4+CT5) / f≤0.5;

[0030] Wherein, CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens. When the above relationship is satisfied, the lens thicknesses can be reasonably distributed while meeting processing requirements, thereby improving the imaging quality of the optical system and achieving an ultra-thin design for the optical system.

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

[0032] 1≤f12 / f≤1.5;

[0033] Wherein, f12 is the combined focal length of the first lens and the second lens. When the above relationship is satisfied, the effective focal length of the optical system can reasonably match the combined focal length of the first lens and the second lens, thereby facilitating the correction of spherical aberration of off-axis light at different aperture positions.

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

[0035] -3≤f6 / f≤0;

[0036] Wherein, f6 is the focal length of the sixth lens. When the above relationship is satisfied, it is beneficial to balance the astigmatism and field curvature of the optical system, thereby improving the imaging quality.

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

[0038] 0.5≤R12 / f≤1.5;

[0039] Wherein, R12 is the radius of curvature of the image side surface of the first lens on the optical axis. When the above relationship is satisfied, high resolution is ensured while also being helpful in reducing the length of the optical system.

[0040] A camera 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 sixth lens.

[0041] By adopting the above optical system, the camera module can be designed to be ultra-thin.

[0042] In one embodiment, the camera module satisfies the relationship:

[0043] 1.0≤TTL / IMGH≤1.4;

[0044] Wherein, IMGH is half of the diagonal length of the effective pixel area on the photosensitive element. When the above relationship is satisfied, it is beneficial to shorten the length of the optical system and facilitate the miniaturization design of the entire camera module.

[0045] An electronic device comprises a housing and a camera module according to any one of the above embodiments, wherein the camera module is arranged in the housing.

[0046] The adoption of the camera module is conducive to the ultra-thin design of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0048] Figure 2 : spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the first embodiment;

[0049] Figure 3 A schematic diagram of an optical system provided in accordance with a second embodiment of the present application;

[0050] Figure 4 : spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the second embodiment;

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

[0052] Figure 6 : spherochromatic aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the third embodiment;

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

[0054] Figure 8 : spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the fourth embodiment;

[0055] Figure 9 A schematic diagram of an optical system provided in a fifth embodiment of the present application;

[0056] Figure 10 : spherochromatic aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the fifth embodiment;

[0057] Figure 11 A schematic diagram of an optical system provided in accordance with a sixth embodiment of the present application;

[0058] Figure 12: spherochromatic aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the sixth embodiment;

[0059] Figure 13 A schematic diagram of an optical system provided in a seventh embodiment of the present application;

[0060] Figure 14 : spherochromatic aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the seventh embodiment;

[0061] Figure 15 A schematic diagram of a camera module provided in one embodiment of the present application;

[0062] Figure 16 A schematic diagram of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0063] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0064] It should be noted that when an element is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central element. When an element is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another component, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0066] With technological changes, various portable electronic devices capable of recording images are constantly being introduced. As consumer demand for capturing high-quality images gradually increases, existing three-, four-, and five-chip camera modules are facing technical bottlenecks. Based on the same chip, in order to obtain higher image clarity, more lenses with complex surface shapes are generally used to eliminate aberrations. However, this structure undoubtedly increases the overall length of the camera module, restricting its miniaturization. To this end, the embodiments of the present application provide an optical system, a camera module, and an electronic device to address the problem of the difficulty in miniaturizing the camera module.

[0067] refer to Figure 1 In one embodiment of the present application, the optical system includes, from the object side to the image side, an aperture STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with refractive power, a fourth lens element L4 with refractive power, a fifth lens element L5 with refractive power, and a sixth lens element L6 with negative refractive power. The aperture STO is coaxial with each lens element. In some embodiments, the aperture STO may also be located on the object side of the first lens element L1. When describing the optical system 10 as including, from the object side to the image side, the aperture STO, the first lens element L1, and the second lens element L2, the aperture STO may be located on the object side surface S1 of the first lens element L1, in which case the projection of the aperture STO on the optical axis overlaps with the projection of the lens element L2; or the aperture STO may be located on the object side of the first lens element L1, and the projection of the aperture STO on the optical axis does not overlap with the projection of the first lens element L1. When the first lens element L1 has positive refractive power, this helps shorten the overall optical length of the optical system 10.

[0068] The first lens L1 has an object-side surface S1 and an image-side surface S2. The second lens L2 has an object-side surface S3 and an image-side surface S4, with the object-side surface S3 being convex at the paraxial position (near the optical axis). The third lens L3 has an object-side surface S5 and an image-side surface S6. The fourth lens L4 has an object-side surface S7 and an image-side surface S8. The fifth lens L5 has 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, with the image-side surface S12 being concave at the paraxial position (near the optical axis). In addition, the optical system 10 also includes an image surface S15, which is the imaging surface of the optical system 10. The image surface S15 can be the photosensitive surface of a photosensitive element, and the photosensitive surface includes an effective pixel area.

[0069] In some embodiments, the object-side surface S11 of the sixth lens L6 is aspherical. Furthermore, in some embodiments, the object-side surface S11 of the sixth lens L6 has at least one inflection point. In some embodiments, the image-side surface S12 of the sixth lens L6 is aspherical. Furthermore, in some embodiments, the image-side surface S12 of the sixth lens L6 has at least one inflection point. The number of inflection points can be one, two, or more.

[0070] In some embodiments, 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.

[0071] The surface formula of an aspheric surface is:

[0072]

[0073] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the cone constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0074] In some embodiments, 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. In this case, plastic lenses can reduce the weight of the optical system 10 and lower production costs. By adjusting the parameters of each lens, the optical system 10 can achieve a lightweight and thin design. In some embodiments, 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 glass. In this case, the optical system 10 can withstand higher temperatures and exhibit better optical performance. In other embodiments, only the first lens L1 can be made of glass, while the other lenses are made of plastic. In this case, the first lens L1, closest to the object side, can better withstand the effects of ambient temperature on the object side. Because the other lenses are made of plastic, the optical system 10 can also maintain lower production costs. It should be noted that, depending on actual needs, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 can each be made of either plastic or glass.

[0075] Continue to refer Figure 1An infrared filter L7 is also provided on the image side of the sixth lens L6. Infrared filter L7 is an infrared cutoff filter that filters out infrared light, preventing it from passing through and reaching the photosensitive element. This prevents infrared interference light from being received by the photosensitive element and affecting normal imaging, thereby improving the imaging quality of the optical system 10. In some embodiments, infrared filter L7 can be assembled on the image side of the optical system 10 along with the photosensitive element when the lenses in the optical system 10 are assembled with the photosensitive element. Infrared filter L7 includes an object-side surface S11 and an image-side surface S12. In some embodiments, during the assembly of the optical system 10, infrared filter L7 can be assembled with each lens, in which case infrared filter L7 becomes an optical element of the optical system 10. In other embodiments, infrared filter L7 can also be installed between the sixth lens L6 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a module.

[0076] In some embodiments, the optical system 10 further includes a prism disposed on the object side of the first lens L1. By combining the prism's effect of altering the incident light path, the incident light is deflected before entering the lens assembly. This allows the optical system 10 to function as a periscope. It should also be noted that in some embodiments, the optical system 10 further includes a photosensitive element for receiving imaging light.

[0077] Furthermore, in some embodiments, the optical system 10 satisfies the relationship:

[0078] (TTL - BFL) / f < 0.92; where TTL is the distance on the optical axis from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10, BFL is the shortest distance parallel to the optical axis from the image-side surface of the sixth lens element L6 to the imaging plane of the optical system 10, and f is the effective focal length of the optical system 10. In some embodiments, (TTL - BFL) / f can be 0.900, 0.902, 0.905, 0.910, 0.912, 0.914, or 0.916. In the above optical system 10, when the first lens element L1 has a positive refractive power, it helps to shorten the total optical length of the optical system 10. When the above relationship is satisfied, the lenses in the optical system 10 can be rationally distributed in space, achieving high pixel density while also enabling an ultra-thin design for the optical system 10. Furthermore, in some embodiments, the optical system 10 satisfies the relationship: (TTL - BFL) / f ≤ 0.918.

[0079] In some embodiments, optical system 10 satisfies the relationship:

[0080] 1mm≤(SAG11+SAG21)*f / EPD≤2mm; wherein, SAG11 is the sag of the object-side surface S1 of the first lens element L1, that is, SAG11 is the horizontal displacement distance from the intersection point of the object-side surface S1 of the first lens element L1 on the optical axis to the position of the maximum effective semi-aperture of the surface in a direction parallel to the optical axis; SAG21 is the sag of the object-side surface S3 of the second lens element L2, that is, SAG21 is the horizontal displacement distance from the intersection point of the object-side surface S3 of the second lens element L2 on the optical axis to the position of the maximum effective semi-aperture of the surface in a direction parallel to the optical axis; and EPD is the entrance pupil diameter of the optical system 10. In some embodiments, (SAG11+SAG21)*f / EPD can be 1.160mm, 1.200mm, 1.250mm, 1.300mm, 1.400mm, 1.500mm, 1.600mm, 1.700mm, 1.750mm, 1.800mm, or 1.850mm. Meeting this relationship can increase the light throughput of the optical system 10, thereby highlighting the imaging subject. This also facilitates the manufacturing of the optical system 10 while ensuring high resolution. Furthermore, in some embodiments, the optical system 10 satisfies the relationship: 1.15≤(SAG11+SAG21)*f / EPD≤1.86.

[0081] In some embodiments, optical system 10 satisfies the relationship:

[0082] SAG21 / CT2 ≤ 0.5, where SAG21 is the sag height of the object-side surface S3 of the second lens element L2, and CT2 is the center thickness of the second lens element L2. The center thickness of a lens is the thickness of the lens along its optical axis. In some embodiments, SAG21 / CT2 can be 0.140, 0.145, 0.150, 0.160, 0.170, 0.180, 0.190, 0.250, 0.280, 0.300, 0.310, or 0.320. Meeting this relationship helps reduce the processing sensitivity of the second lens element L2 and balance the field curvature of the optical system 10. Furthermore, in some embodiments, the optical system 10 satisfies the relationship: 0.137 ≤ SAG21 / CT2 ≤ 0.329.

[0083] In some embodiments, optical system 10 satisfies the relationship:

[0084] ∑CT / T214 ≤ 1; where ∑CT is the sum of the center thicknesses of all lenses in optical system 10, and T214 is the distance along the optical axis from the object-side surface S1 of first lens L1 to the image-side surface S12 of sixth lens L6. In some embodiments, ∑CT / T214 can be 0.620, 0.630, 0.650, 0.670, 0.675, 0.678, or 0.680. Satisfying this relationship can make the structure of optical system 10 more compact and improve the lens assembly process by rationally arranging the thicknesses of the lenses in optical system 10. Furthermore, in some embodiments, optical system 10 satisfies the relationship: 0.617 ≤ ∑CT / T214 ≤ 0.682.

[0085] In some embodiments, optical system 10 satisfies the relationship:

[0086] 1≤ET2 / CT2≤2; where ET2 is the edge thickness of the second lens element L2, i.e., ET2 is the thickness of the second lens element L2 at its maximum effective semi-aperture, and CT2 is the center thickness of the second lens element L2. In some embodiments, ET2 / CT2 can be 1.320, 1.340, 1.350, 1.380, 1.400, 1.420, 1.450, 1.470, or 1.485. Meeting this relationship helps reduce stray light in the optical system 10 and improve imaging quality. Furthermore, in some embodiments, the optical system 10 satisfies the relationship: 1.317≤ET2 / CT2≤1.490.

[0087] In some embodiments, optical system 10 satisfies the relationship:

[0088] (CT3+CT4+CT5) / f≤0.5; where CT3 is the center thickness of the third lens L3, CT4 is the center thickness of the fourth lens L4, and CT5 is the center thickness of the fifth lens L5. In some embodiments, (CT3+CT4+CT5) / f can be 0.205, 0.210, 0.220, 0.230, 0.235, or 0.240. When the above relationship is satisfied, the lens thickness can be reasonably distributed while meeting processing requirements, thereby improving the imaging quality of the optical system 10 and enabling an ultra-thin design of the optical system 10. Furthermore, in some embodiments, the optical system 10 satisfies the relationship: 0.201≤(CT3+CT4+CT5) / f≤0.240.

[0089] In some embodiments, optical system 10 satisfies the relationship:

[0090] 1.0≤f12 / f≤1.5; where f12 is the combined focal length of first lens L1 and second lens L2. In some embodiments, f12 / f can be 1.070, 1.090, 1.100, 1.120, 1.130, 1.150, or 1.160. When the above relationship is satisfied, the effective focal length of optical system 10 can be reasonably matched with the combined focal length of first lens L1 and second lens L2, thereby facilitating the correction of spherical aberration of off-axis light at different aperture positions. Furthermore, in some embodiments, optical system 10 satisfies the relationship: 1.067≤f12 / f≤1.164.

[0091] In some embodiments, optical system 10 satisfies the relationship:

[0092] -3≤f6 / f≤0; where f6 is the focal length of sixth lens L6. In some embodiments, f6 / f can be -2.500, -2.400, -2.200, -2.000, -1.500, -1.300, -1.200, -1.100, -1.000, or -0.980. Meeting this relationship helps balance astigmatism and field curvature in optical system 10, thereby improving imaging quality. Furthermore, in some embodiments, optical system 10 satisfies the relationship: -2.514≤f6 / f≤-0.969.

[0093] In some embodiments, optical system 10 satisfies the relationship:

[0094] 0.5 ≤ R12 / f ≤ 1.5; where R12 is the radius of curvature of the image-side surface of first lens L1 along the optical axis. In some embodiments, R12 / f can be 0.950, 0.970, 1.000, 1.100, 1.200, 1.250, 1.300, 1.330, 1.350, or 1.360. Meeting this relationship helps reduce the length of optical system 10 while maintaining high resolution. Furthermore, in some embodiments, optical system 10 satisfies the relationship: 0.941 ≤ R12 / f ≤ 1.364.

[0095] In some embodiments, the optical system 10 satisfies the relationship: 4.95≤f≤5.89; f is the effective focal length of the optical system 10, and the unit of f is mm.

[0096] In some embodiments, the optical system 10 satisfies the relationship: 1.79≤FNO≤2.2, where FNO is the aperture number of the optical system 10 .

[0097] In some embodiments, the optical system 10 satisfies the relationship: 75.66≤FOV≤85.40; FOV is the maximum field of view (diagonal viewing angle) of the optical system 10, and the unit of FOV is degree (deg.).

[0098] In some embodiments, the optical system 10 can be regarded as a lens group or lens system composed of various lenses. At this time, when the optical system 10 is assembled together with the photosensitive element to form a camera module, the camera module can satisfy the relationship: 1.0≤TTL / IMGH≤1.4; wherein IMGH is half the diagonal length of the effective pixel area on the photosensitive element. Specifically, TTL / IMGH can be 1.240, 1.250, 1.300, 1.320, 1.350, 1.370, 1.380 or 1.390. When the above relationship is met, it is beneficial to shorten the length of the optical system 10 and facilitate the miniaturization design of the entire camera module. Furthermore, in some embodiments, the camera module satisfies the relationship: 1.237≤TTL / IMGH≤1.392.

[0099] In some embodiments, the optical system 10 satisfies the relationship: ImgH=4.64; ImgH is half of the diagonal length of the effective pixel area on the photosensitive element, and the unit of ImgH is mm.

[0100] In some embodiments, the optical system 10 satisfies the relationship: 5.74≤TTL≤6.46, where TTL is the distance from the object-side surface S1 of the first lens L1 to the imaging plane of the optical system 10 on the optical axis, and the unit of TTL is mm.

[0101] Next, the optical system 10 of the present application will be described with more specific and detailed embodiments.

[0102] First embodiment

[0103] refer to Figure 1 and Figure 2 In the first embodiment, the optical system 10 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 2 The diagram includes a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the first embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0104] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0105] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0106] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0107] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0108] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is concave at the optical axis and concave at the circumference.

[0109] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0110] It should be noted that when a side surface of a lens is described as convex at the optical axis (the central area of ​​the side surface) in this application, it can be understood that the area of ​​the side surface of the lens near the optical axis is convex, and therefore the side surface can also be considered to be convex near the axis; when a side surface of a lens is described as concave at the circumference, it can be understood that the area of ​​the side surface near the maximum effective radius is concave. For example, when the side surface is convex at the optical axis and also convex at the circumference, the shape of the side surface from the center (optical axis) to the edge can be purely convex, that is, there is no inflection point on the side surface; or it can first transition from a convex shape at the center to a concave shape, and then become convex when approaching the maximum effective radius. This is only an example to illustrate the relationship between the optical axis and the circumference. The various shape structures of the side surface (concave-convex relationship) are not fully reflected, but other situations can be deduced based on the above examples.

[0111] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0112] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0113] refer to Figure 1An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0114] In the first embodiment, the optical system 10 satisfies the following relationships:

[0115] (TTL - BFL) / f = 0.917; where TTL is the distance from the object-side surface of the first lens element L1 to the imaging plane of the optical system 10 on the optical axis, BFL is the shortest distance from the image-side surface of the sixth lens element L6 to the imaging plane of the optical system 10 in a direction parallel to the optical axis, and f is the effective focal length of the optical system 10. In the above optical system 10, when the first lens element L1 has positive refractive power, the total optical length of the optical system 10 is shortened. When the above relationship is satisfied, the spatial distribution of the lenses in the optical system 10 can be rationally allocated, achieving both high pixel count and an ultra-thin design for the optical system 10.

[0116] (SAG11+SAG21)*f / EPD=1.341mm; where SAG11 is the sag of the object-side surface S1 of the first lens element L1, i.e., SAG11 is the horizontal displacement distance from the intersection of the object-side surface S1 of the first lens element L1 on the optical axis to the position of the maximum effective semi-aperture of the surface parallel to the optical axis; SAG21 is the sag of the object-side surface S3 of the second lens element L2, i.e., SAG21 is the horizontal displacement distance from the intersection of the object-side surface S3 of the second lens element L2 on the optical axis to the position of the maximum effective semi-aperture of the surface parallel to the optical axis; and EPD is the entrance pupil diameter of the optical system 10. When the above relationship is satisfied, the light throughput of the optical system 10 is increased, thereby highlighting the imaging subject, while ensuring high resolution and facilitating the molding and manufacturing of the optical system 10.

[0117] SAG21 / CT2 = 0.182; where SAG21 is the sag height of the object-side surface S3 of the second lens element L2, and CT2 is the center thickness of the second lens element L2. The center thickness of a lens is the thickness of the lens along its optical axis. Meeting this relationship helps reduce the processing sensitivity of the second lens element L2 and balance the field curvature of the optical system 10.

[0118] ∑CT / T214=0.617; where ∑CT is the sum of the center thicknesses of all lenses in optical system 10, and T214 is the distance along the optical axis from the object-side surface S1 of first lens L1 to the image-side surface S12 of sixth lens L6. Satisfying this relationship allows for a more compact structure and improved lens assembly process by rationally arranging the thicknesses of the lenses in optical system 10.

[0119] ET2 / CT2 = 1.347; where ET2 is the edge thickness of second lens element L2, i.e., ET2 is the thickness of second lens element L2 at its maximum effective semi-aperture, and CT2 is the center thickness of second lens element L2. Meeting this relationship helps reduce stray light in optical system 10 and improves imaging quality.

[0120] (CT3+CT4+CT5) / f=0.219; where CT3 is the center thickness of the third lens L3, CT4 is the center thickness of the fourth lens L4, and CT5 is the center thickness of the fifth lens L5. When the above relationship is satisfied, the lens thicknesses can be reasonably distributed while meeting processing requirements, thereby improving the imaging quality of the optical system 10 and achieving an ultra-thin design for the optical system 10.

[0121] f12 / f = 1.164; where f12 is the combined focal length of first lens L1 and second lens L2. When this relationship is satisfied, the effective focal length of optical system 10 is appropriately matched to the combined focal length of first lens L1 and second lens L2, thereby facilitating correction of spherical aberration of off-axis light at different aperture positions.

[0122] f6 / f=-1.109, where f6 is the focal length of the sixth lens L6. When the above relationship is satisfied, it is beneficial to balance the astigmatism and field curvature of the optical system 10, thereby improving the imaging quality.

[0123] R12 / f=1.281, where R12 is the radius of curvature of the image side surface of the first lens L1 on the optical axis. When the above relationship is satisfied, high resolution is ensured while also reducing the length of the optical system 10.

[0124] Optical system 10 can be considered a lens assembly or lens system composed of individual lenses. When optical system 10 is assembled with a photosensitive element to form a camera module, the camera module satisfies the relationship: TTL / IMGH = 1.293, where IMGH is half the diagonal length of the effective pixel area on the photosensitive element. Meeting this relationship facilitates a shorter optical system 10 and a miniaturized design for the entire camera module.

[0125] In addition, the lens parameters of optical system 10 are given in Tables 1 and 2. K in Table 2 is the cone constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface formula. The elements from the object plane to the image plane S15 are arranged in the order of the elements from top to bottom in Table 1. Surface numbers 2 and 3 represent 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 the smaller surface number is the object side surface, and the surface with the larger surface number is the image side surface. The Y radius in Table 1 is the radius of curvature of the object side or image side surface of the corresponding surface number at the paraxial position (or understood as on the optical axis). The first value in the "Thickness" parameter column for a lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens on the optical axis. The "Thickness" parameter in surface number 1 is the distance from the aperture STO to the object side surface of the first lens L1 on the optical axis. The value for stop STO in the "Thickness" column is the distance along the optical axis from stop STO to the vertex of the object side surface of the next lens (in this embodiment, the first lens L1) (the vertex refers to the intersection of the lens and the optical axis). The direction from the object side surface of the first lens L1 to the image side surface of the last lens is assumed to be the positive direction of the optical axis. A negative value indicates that stop STO is located to the right of the vertex of the object side surface of the lens (or, in other words, located on the image side of the vertex). A positive value for the "Thickness" parameter of stop STO indicates that stop STO is located to the left of the vertex of the object side surface of the lens (or, in other words, located on the object side of the vertex). The optical axes of the lenses in this embodiment are aligned on a straight line, which serves as the optical axis of optical system 10. The "Thickness" parameter value for surface number 13 is the distance along the optical axis from the image side surface S12 of the sixth lens L6 to the object side surface S13 of the infrared filter L7. The "Thickness" parameter corresponding to surface number 15 of infrared filter L7 is the distance along the optical axis from image-side surface S14 of infrared filter L7 to image surface S15 of optical system 10. Image surface S15 is the imaging surface of optical system 10 and can also be understood as the photosensitive surface of the photosensitive element.

[0126] In the first embodiment, the effective focal length f of the optical system 10 is 5.43 mm, the aperture number FNO is 1.93, the maximum field of view (diagonal viewing angle) FOV is 80.2°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0127] In the following examples (Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, and Example 7), the refractive index, Abbe number, and focal length of each lens are values ​​at a wavelength of 587 nm. Furthermore, the relationship calculations and lens surface profiles for each example are subject to the lens parameters (e.g., Tables 1, 2, 3, and 4).

[0128] Table 1

[0129]

[0130] Table 2

[0131]

[0132]

[0133] Second embodiment

[0134] refer to Figure 3 and Figure 4 In the second embodiment, the optical system 10 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 negative 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 The diagram includes a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0135] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0136] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0137] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0138] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0139] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is concave at the optical axis and concave at the circumference.

[0140] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0141] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0142] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0143] refer to Figure 3 An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0144] In the second embodiment, the effective focal length f of the optical system 10 is 5.42 mm, the aperture number FNO is 1.89, the maximum field of view (diagonal viewing angle) FOV is 80.33°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0145] In addition, the parameters of each lens of the optical system 10 are given in Table 3 and Table 4, wherein the definition of each parameter can be obtained from the first embodiment and will not be repeated here.

[0146] Table 3

[0147]

[0148] Table 4

[0149]

[0150]

[0151] From the above data, we can infer:

[0152]

[0153] Third embodiment

[0154] refer to Figure 5 and Figure 6 In the third embodiment, the optical system 10 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. Figure 6 The diagrams include a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0155] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0156] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0157] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is convex at the optical axis and convex at the circumference.

[0158] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0159] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is convex at the optical axis and concave at the circumference.

[0160] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0161] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0162] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0163] refer to Figure 5 An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0164] In the third embodiment, the effective focal length f of the optical system 10 is 5.67 mm, the aperture number FNO is 1.83, the maximum field of view (diagonal viewing angle) FOV is 77.79°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0165] In addition, the parameters of each lens of the optical system 10 are given in Table 5 and Table 6, wherein the definition of each parameter can be obtained from the first embodiment and will not be repeated here.

[0166] Table 5

[0167]

[0168] Table 6

[0169]

[0170]

[0171] From the above data, we can infer:

[0172]

[0173] Fourth embodiment

[0174] refer to Figure 7 and Figure 8 In the fourth embodiment, the optical system 10 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 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 8 The diagrams include a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0175] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0176] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0177] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0178] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0179] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is concave at the optical axis and concave at the circumference.

[0180] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0181] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0183] refer to Figure 7 An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0184] In the fourth embodiment, the effective focal length f of the optical system 10 is 4.95 mm, the aperture number FNO is 2.04, the maximum field of view (diagonal viewing angle) FOV is 85.4°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH is 4.64 mm.

[0185] In addition, the parameters of each lens of the optical system 10 are given in Table 7 and Table 8, wherein the definition of each parameter can be obtained from the first embodiment and will not be repeated here.

[0186] Table 7

[0187]

[0188] Table 8

[0189]

[0190]

[0191] From the above data, we can infer:

[0192]

[0193] Fifth embodiment

[0194] refer to Figure 9 and Figure 10 In the fifth embodiment, the optical system 10 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 negative refractive power, and a sixth lens L6 with negative refractive power. Figure 10 The diagrams include a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fifth embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0195] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0196] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0197] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0198] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0199] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is concave at the optical axis and concave at the circumference.

[0200] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0201] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0202] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0203] refer to Figure 9 An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0204] In the fifth embodiment, the effective focal length f of the optical system 10 is 5.89 mm, the aperture number FNO is 2.2, the maximum field of view (diagonal viewing angle) FOV is 76.66°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0205] In addition, the lens parameters of the optical system 10 are given in Tables 9 and 10, wherein the definitions of the parameters can be obtained from the first embodiment and are not described in detail here.

[0206] Table 9

[0207]

[0208]

[0209] Table 10

[0210]

[0211]

[0212] From the above data, we can infer:

[0213]

[0214] Sixth embodiment

[0215] refer to Figure 11 and Figure 12 In the sixth embodiment, the optical system 10 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 negative 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 12 The diagrams include a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the sixth embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0216] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0217] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0218] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0219] The object-side surface S7 of the fourth lens L4 is convex at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0220] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is concave at the optical axis and concave at the circumference.

[0221] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0222] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0223] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0224] refer to Figure 11 An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0225] In the sixth embodiment, the effective focal length f of the optical system 10 is 5.29 mm, the aperture number FNO is 1.86, the maximum field of view (diagonal viewing angle) FOV is 81.62°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0226] In addition, the lens parameters of the optical system 10 are given in Table 11 and Table 12, wherein the definitions of the parameters can be obtained from the first embodiment and are not described in detail here.

[0227] Table 11

[0228]

[0229]

[0230] Table 12

[0231]

[0232] From the above data, we can infer:

[0233]

[0234] Seventh embodiment

[0235] refer to Figure 13 and Figure 14 In the seventh embodiment, the optical system 10 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. Figure 14The diagrams include a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the seventh embodiment, wherein the astigmatism diagram and the distortion diagram are curve diagrams at a wavelength of 555 nm.

[0236] The object-side surface S1 of the first lens L1 is convex at the optical axis and convex at the circumference; the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0237] The object-side surface S3 of the second lens L2 is convex at the optical axis and convex at the circumference; the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0238] The object-side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference; the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0239] The object-side surface S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference; the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0240] The object-side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference; the image-side surface S10 is convex at the optical axis and concave at the circumference.

[0241] The object-side surface S11 of the sixth lens L6 is convex at the optical axis and convex at the circumference; the image-side surface S12 is concave at the optical axis and convex at the circumference.

[0242] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical. By combining the aspherical surfaces of each lens in the optical system 10, the problem of field of view distortion in the optical system 10 can be effectively resolved. It also enables the lenses to achieve excellent optical effects while being relatively small and thin, further reducing the size of the optical system 10 and facilitating its miniaturization.

[0243] 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. The use of plastic lenses can reduce the manufacturing cost and weight of the optical system 10, thereby facilitating a lightweight and thin design of the optical system 10.

[0244] refer to Figure 13An infrared filter L7, also known as an infrared cutoff filter, is also provided on the image side of sixth lens L6 to filter out infrared light. In some embodiments, the infrared cutoff filter is part of optical system 10, for example, assembled to the lens barrel along with each lens. In other embodiments, the infrared cutoff filter is installed between optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module.

[0245] In the seventh embodiment, the effective focal length f of the optical system 10 is 5.53 mm, the aperture number FNO is 1.79, the maximum field of view (diagonal viewing angle) FOV is 79.14°, and half the diagonal length of the effective pixel area at the image plane S15 is ImgH=4.64 mm.

[0246] In addition, the lens parameters of the optical system 10 are given in Table 13 and Table 14, wherein the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0247] Table 13

[0248]

[0249]

[0250] Table 14

[0251]

[0252] From the above data, we can infer:

[0253]

[0254]

[0255] refer to Figure 15 In one embodiment provided in the present application, the optical system 10 is assembled with a photosensitive element 210 to form a camera module 20. In this case, an infrared filter L7 is provided between the sixth lens L6 and the photosensitive element 210 in this embodiment to filter out infrared light. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). By adopting the optical system 10, the camera module 20 can have high-pixel imaging performance while also being able to shorten its length, thereby achieving an ultra-thin design, that is, a miniaturized design.

[0256] In some embodiments, the distance between the photosensitive element 210 and each lens in the optical system 10 is relatively fixed. In this case, the camera module 20 is a fixed-focus module. In other embodiments, a driving mechanism such as a voice coil motor can be provided to enable the photosensitive element 210 to move relative to each lens in the optical system 10, thereby achieving a focusing effect. In some embodiments, a driving mechanism can also be provided to drive the movement of some lenses in the optical system 10, thereby achieving an optical zoom effect.

[0257] refer to Figure 16 Some embodiments of the present application further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30. Specifically, the electronic device 30 includes a housing 310, and the camera module 20 is installed in the housing 310. The electronic device 30 includes but is not limited to smart phones, smart watches, e-book readers, vehicle-mounted camera equipment, monitoring equipment, medical equipment (such as endoscopes), tablet computers, biometric equipment (such as fingerprint recognition equipment or pupil recognition equipment, etc.), PDAs (Personal Digital Assistants), game consoles, PCs, drones and other terminal devices, as well as home appliances with additional camera functions. By adopting the above-mentioned camera module 20, the installation space of the camera module 20 in the electronic device will be effectively reduced, which is conducive to the ultra-thin design of the electronic device.

[0258] Specifically, in some embodiments, the camera module 20 is applied to a smartphone. The smartphone includes a midframe and a circuit board. The circuit board is disposed in the midframe, and the camera module 20 is mounted in the midframe of the smartphone. The photosensitive element therein is electrically connected to the circuit board. The camera module 20 can serve as a front camera module or a rear camera module of the smartphone.

[0259] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0260] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An optical system, characterized in that: There are six lenses with refractive power, including the following from the object side to the image side: Aperture; a first lens having positive refractive power, wherein the object-side surface of the first lens is convex at the paraxial portion thereof and the image-side surface of the first lens is concave at the paraxial portion thereof; a second lens having negative refractive power, wherein the object-side surface of the second lens is convex at the paraxial position; a third lens having refractive power, wherein the object-side surface of the third lens is convex at the paraxial portion; a fourth lens having refractive power, wherein the image-side surface of the fourth lens is convex at the paraxial portion; a fifth lens element having refractive power, wherein the object-side surface of the fifth lens element is convex 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; The optical system satisfies the following relationships: (TTL-BFL) / f<0.92, 1.79≤FNO≤2.2, 75.66≤FOV≤85.40, 1.0≤TTL / IMGH≤1.4, 0.135≤SAG21 / CT2≤0.327; Among them, TTL is the distance from the object side surface of the first lens to the imaging plane of the optical system on the optical axis, BFL is the shortest distance from the image side surface of the sixth lens to the imaging plane of the optical system in a direction parallel to the optical axis, f is the effective focal length of the optical system, FNO is the aperture number of the optical system, FOV is the maximum field of view of the optical system, IMGH is half the diagonal length of the effective pixel area on the photosensitive element, SAG21 is the sag of the object side surface of the second lens, and CT2 is the center thickness of the second lens.

2. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1mm≤(SAG11+SAG21) f / EPD≤2mm; Wherein, SAG11 is the sag height of the object side surface of the first lens, and EPD is the entrance pupil diameter of the optical system.

3. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 0.617≤∑CT / T214≤1; Wherein, ΣCT is the sum of the center thicknesses of all lenses in the optical system, and T214 is the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis.

4. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1≤ET2 / CT2≤1.490; Wherein, ET2 is the edge thickness of the second lens, and CT2 is the center thickness of the second lens.

5. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 0.201≤(CT3+CT4+CT5) / f≤0.5; Wherein, CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

6. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1≤f12 / f≤1.5; Wherein, f12 is the combined focal length of the first lens and the second lens.

7. The optical system according to claim 1, wherein: The optical system satisfies the relationship: -3≤f6 / f≤-0.969; Wherein, f6 is the focal length of the sixth lens.

8. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 0.941≤R12 / f≤1.5; R12 is the radius of curvature of the image side surface of the first lens on the optical axis.

9. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1.237 ≤ TTL / IMGH ≤ 1.392; and / or, 0.899≤(TTL-BFL) / f ≤0.

918.

10. A camera module, characterized in that: The optical system comprises a photosensitive element and the optical system according to any one of claims 1 to 9, wherein the photosensitive element is arranged on the image side of the sixth lens.

11. An electronic device, characterized in that: It comprises a shell and the camera module according to claim 10, wherein the camera module is arranged in the shell.

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