CN219978613U

CN219978613U - Optical system, camera module and electronic equipment

Info

Publication number: CN219978613U
Application number: CN202223545315.3U
Authority: CN
Inventors: 京谷升一; 杉山隆
Original assignee: Jiangxi Oufei Optics Co ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-11-07
Anticipated expiration: 2032-12-29

Abstract

Six lens elements with refractive power, an optical system, an image capturing module and an electronic device, wherein the optical system sequentially comprises from an object side to an image side along an optical axis: a first lens element and a fifth lens element each having negative refractive power, and a second lens element and a third lens element each having positive refractive power, and a fourth lens element and a sixth lens element each having positive refractive power; the object side surface of the first lens element, the image side surface of the second lens element, the image side surface of the third lens element, the object side surface and the image side surface of the fourth lens element, the image side surface of the fifth lens element and the object side surface of the sixth lens element are convex at the paraxial region, and the object side surface of the first lens element, the object side surface of the second lens element, the object side surface of the third lens element, the object side surface of the fifth lens element and the image side surface of the sixth lens element are concave at the paraxial region.

Description

Optical system, camera module and electronic equipment

Technical Field

The application belongs to the technical field of optical imaging, and particularly relates to an optical system, a camera module and electronic equipment.

Background

In recent years, portable electronic products with photographing function have been increasingly thinner and lighter, and thus, demands for high imaging quality and miniaturization of optical systems, such as larger angle of view, have been increasing. However, the requirement of meeting the imaging requirements of different environments generally means that the optical system is more complex, which eventually leads to an increase in the size and overall length of the imaging module, and is difficult to be applied to light and thin electronic products.

Therefore, how to achieve miniaturization and good imaging effect on the premise of ensuring a larger field angle of view of an optical system becomes one of the problems that must be solved in the industry.

Disclosure of Invention

The utility model aims to provide an optical system, an imaging module and electronic equipment, which are used for solving the requirements of the optical system for meeting a large field angle, miniaturization and good imaging effect.

In order to achieve the purpose of the utility model, the utility model provides the following technical scheme:

in a first aspect, the present utility model provides an optical system, including, in order from an object side to an image side along an optical axis: a first lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a second lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a third lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface at a paraxial region; a fifth lens element with negative refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the image-side surface of the sixth lens element is concave at a paraxial region thereof.

The optical system satisfies the relation: 47deg/mm < FOV/f < 50deg/mm; wherein FOV is the maximum field angle of the optical system and f is the effective focal length of the optical system.

The first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, so that the incident angle of light can be increased and the angle of view of the optical system can be increased; the object side surface of the second lens element is concave at a paraxial region, and the image side surface of the second lens element is convex at the paraxial region, so that the aberration of the optical system can be corrected, and the imaging quality of the optical system can be improved; the third lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, so that the positive refractive power of the third lens element is enhanced, and a reasonable light incident angle is further provided for introducing marginal light rays, so that the third lens element is matched with the second lens element to further correct the aberration of the optical system; the fourth lens element with positive refractive power has convex object-side and image-side surfaces at the paraxial region, so that the incident light can be contracted, the aberration of marginal light can be reduced, and the risk of ghost image generated by the optical system can be reduced; the object side surface of the fifth lens element is concave at a paraxial region, and the image side surface of the fifth lens element is convex at the paraxial region, so that the aberration of the optical system can be corrected, the refractive power of the optical system can be reasonably distributed, the compactness among the lens elements can be improved, and the miniaturization characteristic can be realized; the object side surface of the sixth lens element is convex at a paraxial region, and the image side surface of the sixth lens element is concave at the paraxial region, so as to be beneficial to balancing aberration such as astigmatism and field curvature generated by each lens element on the object side, correcting anamorphic image, and further improving imaging quality of the optical system.

By making the optical system satisfy the relation: the ratio of the maximum field angle of the optical system to the effective focal length of the optical system is reasonably configured, the viewing area of the optical system can be effectively improved, the optical system can be developed towards the wide angle direction, the effective focal length of the optical system is controlled within a reasonable range, and the length of the effective focal length can be ensured while the optical system accommodates more viewing areas of the image pickup pictures. The lower limit of the relation is lower than the lower limit of the relation, the view angle of the optical system cannot meet the requirement, so that the view finding area of an image pick-up picture is limited, and the development of the optical system in the wide angle direction is restrained; exceeding the upper limit of the relation, the effective focal length of the optical system is too short, which results in the optical system being too sensitive and unfavorable for the production of the optical system.

In one embodiment, the optical system satisfies the relationship: f6/f is more than 2.0 and less than 3.5; wherein f6 is an effective focal length of the sixth lens, and f is an effective focal length of the optical system. The optical system meets the relation, so that the ratio of the effective focal length of the sixth lens to the effective focal length of the optical system is reasonably configured, the aberration generated by the lens before the light passes through the sixth lens is corrected, the resolution power of the optical system is improved, the emergent angle of the light after being deflected by the optical system is reduced, the light enters the photosensitive element positioned at the image side of the camera module at a smaller angle, the photosensitive performance of the photosensitive element is improved, and the imaging quality of the camera module is improved.

In one embodiment, the optical system further comprises a diaphragm, the optical system satisfying the relation: f6/RL is more than 0.85 and less than 1.5; where f6 is an effective focal length of the sixth lens element, and RL is a distance between the stop and the image side surface of the sixth lens element on the optical axis. The optical system meets the relation, so that the ratio of the effective focal length of the sixth lens to the distance from the diaphragm to the image side surface of the sixth lens on the optical axis is reasonably configured, the relation between the focal length of the sixth lens and the total length of the optical system is effectively controlled, and the optical system has enough refractive power to light and ensures good light and thin characteristics. The distance between the diaphragm and the sixth lens in the optical system is too large below the lower limit of the relation, which is not beneficial to meeting the miniaturization requirement of the optical system; exceeding the upper limit of the relation, the distance between the diaphragm and the sixth lens in the optical system is too small, the space between the diaphragm and each lens between the diaphragm and the sixth lens is too small, and the space allowance is too small, so that the sensitivity of the optical system is increased, and the manufacturability is poor.

In one embodiment, the optical system satisfies the relationship: f4/f is more than 1.0 and less than 2.0; wherein f4 is an effective focal length of the fourth lens, and f is an effective focal length of the optical system. The optical system satisfies the relation, so that the ratio of the effective focal length of the fourth lens to the effective focal length of the optical system is reasonably configured, the aberration correction capability of the optical system is improved by controlling the contribution of the fourth lens to the total refractive power of the optical system, and the fourth lens can be matched with the front lens and the rear lens to achieve a better aberration correction effect so as to ensure that good imaging quality is obtained, and meanwhile, the total length of the optical system is shortened. The lower limit of the relation is lower than the lower limit of the relation, so that excessive concentration of the refractive power of the fourth lens is easy to cause, the aberration balance of the whole optical system is destroyed, and the imaging quality is reduced; exceeding the upper limit of the relationship, the insufficient positive refractive power provided by the fourth lens element may make it difficult for the rear lens element (i.e., the fifth lens element and the sixth lens element) to balance the aberration in the optical system, and increase the sensitivity of the optical system, resulting in poor imaging quality.

In one embodiment, the optical system satisfies the relationship: 1.2 < |f4/f5| < 2.0; wherein f4 is an effective focal length of the fourth lens, and f5 is an effective focal length of the fifth lens. The optical system satisfies the relation, so that the absolute value of the ratio of the effective focal length of the fourth lens to the effective focal length of the fifth lens is reasonably configured, the positive and negative refractive power lenses are matched with each other to offset aberration generated by the positive and negative refractive power lenses, so that the aberration generated by the fourth lens and the fifth lens can be mutually corrected, the aberration correction of the optical system is further enhanced, the influence of the fourth lens and the fifth lens on the aberration of the optical system is reduced, the imaging quality of the optical system is improved, and meanwhile, the size compression is facilitated, and the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: 1.0 < |f3/f5| < 2.0; wherein f3 is an effective focal length of the third lens, and f5 is an effective focal length of the fifth lens. The optical system satisfies the relation, so that the absolute value of the ratio of the effective focal length of the third lens to the effective focal length of the fifth lens is reasonably configured, the positive refractive power and the negative refractive power of the lens are balanced, and the aberration generated in the optical system is counteracted by mutual cooperation, so that the aberration generated by the third lens and the aberration generated by the fifth lens are mutually corrected, the aberration correction of the optical system is further enhanced, the influence of the third lens and the fifth lens on the aberration of the optical system is reduced, the imaging quality of the optical system is improved, and meanwhile, the size compression is facilitated, and the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: f3/f4 is more than 0.8 and less than 1.2; wherein f3 is an effective focal length of the third lens, and f4 is an effective focal length of the fourth lens. The optical system satisfies the above relation, so that the ratio of the effective focal length of the third lens to the effective focal length of the fourth lens is reasonably configured, the positive refractive power distribution between the lenses is further balanced, the aberration generated by the third lens and the fourth lens is mutually corrected, and the aberration correction of the optical system is enhanced.

In one embodiment, the optical system satisfies the relationship: 5 < |f2/f| < 16; wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system. The optical system meets the relation, so that the ratio of the effective focal length of the second lens to the effective focal length of the optical system is reasonably configured, the marginal field aberration of the optical system is corrected, the imaging resolution of the optical system is improved, and the imaging quality of the optical system is further improved.

In one embodiment, the optical system satisfies the relationship: -1.5 < f1/f3 < -0.6; wherein f1 is an effective focal length of the first lens, and f3 is an effective focal length of the third lens. The optical system satisfies the above relation, so that the ratio of the effective focal length of the first lens to the effective focal length of the third lens is reasonably configured, aberration generated by the first lens and the third lens is mutually corrected, aberration correction of the optical system is enhanced, in addition, the above relation is satisfied, the first lens and the third lens are convenient to have different material selections, and defocusing caused by temperature can be corrected by adjusting the material of the first lens and the third lens, for example, the material of at least one of the first lens and the third lens is glass, and meanwhile, size compression is facilitated, so that the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: R51/R52 is more than 0.8 and less than 1.0; wherein R51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R52 is a radius of curvature of the image side surface of the fifth lens element at the optical axis. The optical system meets the relation, so that the ratio of the curvature radius of the object side surface of the fifth lens to the curvature radius of the image side surface of the fifth lens at the optical axis is reasonably configured, the bending degree of the fifth lens is further controlled, the processing difficulty of the fifth lens is reduced, meanwhile, the edge aberration of the optical system is corrected, the generation of astigmatism is restrained, and the imaging effect of the optical system is improved.

In one embodiment, the optical system satisfies the relationship: R61/R62 is more than 0.5 and less than 0.9; wherein R61 is a radius of curvature of the object side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image side surface of the sixth lens element at the optical axis. The optical system meets the relation, so that the ratio of the curvature radius of the object side surface of the sixth lens to the curvature radius of the image side surface of the sixth lens at the optical axis is reasonably configured, the bending degree of the sixth lens is further controlled, the processing difficulty of the sixth lens is reduced, meanwhile, the edge aberration of the optical system is corrected, the generation of astigmatism is restrained, and the imaging effect of the optical system is improved.

In one embodiment, the optical system satisfies the relationship: 0.8 < SD11/IH < 1.3; wherein SD11 is the maximum effective aperture of the object side surface of the first lens, and IH is the image height corresponding to the maximum field angle of the optical system. By enabling the optical system to meet the relation, the ratio of the maximum effective caliber of the object side surface of the first lens to the image height corresponding to the maximum field angle of the optical system is controlled within a reasonable range, the effective caliber of the first lens is ensured to be kept within a reasonable range, the caliber of each lens is proper, the design and the manufacture of a miniaturized lens barrel are facilitated, the miniaturization feasibility is ensured, the compactness of the optical system structure is further improved, and meanwhile, the refractive power of the first lens to light is also facilitated to be improved, and distortion and aberration are further reduced. The aperture of the first lens is smaller than the lower limit of the relation, and the aperture of the first lens is not beneficial to the improvement of the imaging quality and the correction of distortion of the optical system because the aperture of the first lens is smaller than the image height corresponding to the maximum field angle of the optical system; exceeding the upper limit of the relation, the aperture of the first lens is excessively large with respect to the image height corresponding to the maximum field angle of the optical system, which is not conducive to miniaturization of the entire optical system and increases the optical total length of the optical system.

In a second aspect, the present application further provides an image capturing module, where the image capturing module includes a photosensitive chip and the optical system according to any one of the embodiments of the first aspect, and the photosensitive chip is disposed on an image side of the optical system. The photosensitive surface of the photosensitive chip is positioned on the imaging surface of the optical system, and light rays of objects incident on the photosensitive surface through the lens can be converted into electric signals of images. The photo-sensing chip may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a Charge-coupled Device (CCD). The camera module can be an imaging module integrated on the electronic equipment or an independent lens. By adding the optical system provided by the application into the image pickup module, the image pickup module can meet the requirements of larger angle of view, miniaturization and good imaging effect by reasonably designing the surface type and refractive power of each lens in the optical system.

In a third aspect, the present application further provides an electronic device, where the electronic device includes a housing and the camera module set in the second aspect, and the camera module set is disposed in the housing. Such electronic devices include, but are not limited to, automobiles, monitors, smart phones, computers, smart watches, and the like. By adding the camera module provided by the application into the electronic equipment, the electronic equipment can meet the requirements of larger field angle, miniaturization and good imaging effect.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1a is a schematic structural view of an optical system of a first embodiment;

FIG. 1b shows a longitudinal spherical aberration, astigmatism and distortion plot of the optical system of the first embodiment;

fig. 2a is a schematic structural view of an optical system of a second embodiment;

FIG. 2b shows a longitudinal spherical aberration, astigmatism and distortion plot of the optical system of the second embodiment;

fig. 3a is a schematic structural view of an optical system of a third embodiment;

FIG. 3b shows a longitudinal spherical aberration, astigmatism and distortion plot of the optical system of the third embodiment;

fig. 4a is a schematic structural view of an optical system of a fourth embodiment;

fig. 4b shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical system of the fourth embodiment;

Fig. 5a is a schematic structural view of an optical system of a fifth embodiment;

fig. 5b shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical system of the fifth embodiment;

FIG. 6 is a schematic diagram of a camera module according to an embodiment of the present application;

fig. 7 shows a schematic structural diagram of an electronic device in an embodiment of the application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.

In a first aspect, the present application provides an optical system, including, in order from an object side to an image side along an optical axis: a first lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a second lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a third lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface at a paraxial region; a fifth lens element with negative refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the image-side surface of the sixth lens element is concave at a paraxial region thereof.

The optical system satisfies the relation: 47deg/mm < FOV/f < 50deg/mm; wherein FOV is the maximum field angle of the optical system and f is the effective focal length of the optical system. Specifically, the value of FOV/f may be 49.621, 49.311, 49.342, 48.861, 47.382, 47.031, 49.899, 48.136, and the like.

In one embodiment, the optical system satisfies the relationship: f6/f is more than 2.0 and less than 3.5; wherein f6 is an effective focal length of the sixth lens, and f is an effective focal length of the optical system. Specifically, the value of f6/f may be 2.434, 2.643, 2.662, 2.610, 2.551, 2.018, 3.462, 3.271, etc.

The optical system meets the relation, so that the ratio of the effective focal length of the sixth lens to the effective focal length of the optical system is reasonably configured, the aberration generated by the lens before the light passes through the sixth lens is corrected, the resolution power of the optical system is improved, the emergent angle of the light after being deflected by the optical system is reduced, the light enters the photosensitive element positioned at the image side of the camera module at a smaller angle, the photosensitive performance of the photosensitive element is improved, and the imaging quality of the camera module is improved.

In one embodiment, the optical system further comprises a diaphragm, the optical system satisfying the relation: f6/RL is more than 0.85 and less than 1.5; where f6 is an effective focal length of the sixth lens element, and RL is a distance between the stop and the image side surface of the sixth lens element on the optical axis. Specifically, the value of f6/RL may be 0.912, 0.952, 0.943, 1.011, 1.014, 0.856, 1.482, 1.301, or the like.

The optical system meets the relation, so that the ratio of the effective focal length of the sixth lens to the distance from the diaphragm to the image side surface of the sixth lens on the optical axis is reasonably configured, the relation between the focal length of the sixth lens and the total length of the optical system is effectively controlled, and the optical system has enough refractive power to light and ensures good light and thin characteristics. The distance between the diaphragm and the sixth lens in the optical system is too large below the lower limit of the relation, which is not beneficial to meeting the miniaturization requirement of the optical system; exceeding the upper limit of the relation, the distance between the diaphragm and the sixth lens in the optical system is too small, the space between the diaphragm and each lens between the diaphragm and the sixth lens is too small, and the space allowance is too small, so that the sensitivity of the optical system is increased, and the manufacturability is poor.

In one embodiment, the optical system satisfies the relationship: f4/f is more than 1.0 and less than 2.0; wherein f4 is an effective focal length of the fourth lens, and f is an effective focal length of the optical system. Specifically, the value of f4/f may be 1.593, 1.541, 1.531, 1.542, 1.522, 1.037, 1.946, 1.338, etc.

The optical system satisfies the relation, so that the ratio of the effective focal length of the fourth lens to the effective focal length of the optical system is reasonably configured, the aberration correction capability of the optical system is improved by controlling the contribution of the fourth lens to the total refractive power of the optical system, and the fourth lens can be matched with the front lens and the rear lens to achieve a better aberration correction effect so as to ensure that good imaging quality is obtained, and meanwhile, the total length of the optical system is shortened. The lower limit of the relation is lower than the lower limit of the relation, so that excessive concentration of the refractive power of the fourth lens is easy to cause, the aberration balance of the whole optical system is destroyed, and the imaging quality is reduced; exceeding the upper limit of the relationship, the insufficient positive refractive power provided by the fourth lens element may make it difficult for the rear lens element (i.e., the fifth lens element and the sixth lens element) to balance the aberration in the optical system, and increase the sensitivity of the optical system, resulting in poor imaging quality.

In one embodiment, the optical system satisfies the relationship: 1.2 < |f4/f5| < 2.0; wherein f4 is an effective focal length of the fourth lens, and f5 is an effective focal length of the fifth lens. Specifically, the values of i f4/f5 may be 1.501, 1.472, 1.462, 1.422, 1.420, 1.273, 1.947, 1.784, etc.

The optical system satisfies the relation, so that the absolute value of the ratio of the effective focal length of the fourth lens to the effective focal length of the fifth lens is reasonably configured, the positive and negative refractive power lenses are matched with each other to offset aberration generated by the positive and negative refractive power lenses, so that the aberration generated by the fourth lens and the fifth lens can be mutually corrected, the aberration correction of the optical system is further enhanced, the influence of the fourth lens and the fifth lens on the aberration of the optical system is reduced, the imaging quality of the optical system is improved, and meanwhile, the size compression is facilitated, and the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: 1.0 < |f3/f5| < 2.0; wherein f3 is an effective focal length of the third lens, and f5 is an effective focal length of the fifth lens. Specifically, the values of i f3/f5 may be 1.670, 1.632, 1.634, 1.653, 1.701, 1.027, 1.974, 1.385, etc.

The optical system satisfies the relation, so that the absolute value of the ratio of the effective focal length of the third lens to the effective focal length of the fifth lens is reasonably configured, the positive refractive power and the negative refractive power of the lens are balanced, and the aberration generated in the optical system is counteracted by mutual cooperation, so that the aberration generated by the third lens and the aberration generated by the fifth lens are mutually corrected, the aberration correction of the optical system is further enhanced, the influence of the third lens and the fifth lens on the aberration of the optical system is reduced, the imaging quality of the optical system is improved, and meanwhile, the size compression is facilitated, and the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: f3/f4 is more than 0.8 and less than 1.2; wherein f3 is an effective focal length of the third lens, and f4 is an effective focal length of the fourth lens. Specifically, the value of f3/f4 may be 1.111, 1.113, 1.114, 1.163, 1.203, 0.836, 0.937, 1.047, etc.

The optical system satisfies the above relation, so that the ratio of the effective focal length of the third lens to the effective focal length of the fourth lens is reasonably configured, the positive refractive power distribution between the lenses is further balanced, the aberration generated by the third lens and the fourth lens is mutually corrected, and the aberration correction of the optical system is enhanced.

In one embodiment, the optical system satisfies the relationship: 5 < |f2/f| < 16; wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system. Specifically, the values of i f2/f may be 5.134, 13.619, 15.090, 6.193, 5.362, 9.462, 14.328, 11.372, etc.

The optical system meets the relation, so that the ratio of the effective focal length of the second lens to the effective focal length of the optical system is reasonably configured, the marginal field aberration of the optical system is corrected, the imaging resolution of the optical system is improved, and the imaging quality of the optical system is further improved.

In one embodiment, the optical system satisfies the relationship: -1.5 < f1/f3 < -0.6; wherein f1 is an effective focal length of the first lens, and f3 is an effective focal length of the third lens. Specifically, the value of f1/f3 may be-0.872, -0.991, -0.992, -0.932, -0.874, -0.627, -1.482, -1.277, etc.

The optical system satisfies the above relation, so that the ratio of the effective focal length of the first lens to the effective focal length of the third lens is reasonably configured, aberration generated by the first lens and the third lens is mutually corrected, aberration correction of the optical system is enhanced, in addition, the above relation is satisfied, the first lens and the third lens are convenient to have different material selections, and defocusing caused by temperature can be corrected by adjusting the material of the first lens and the third lens, for example, the material of at least one of the first lens and the third lens is glass, and meanwhile, size compression is facilitated, so that the optical system is miniaturized.

In one embodiment, the optical system satisfies the relationship: R51/R52 is more than 0.8 and less than 1.0; wherein R51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R52 is a radius of curvature of the image side surface of the fifth lens element at the optical axis. Specifically, the values of R51/R52 may be 0.901, 0.851, 0.854, 0.902, 0.903, 0.987, 0.812, 0.966, etc.

The optical system meets the relation, so that the ratio of the curvature radius of the object side surface of the fifth lens to the curvature radius of the image side surface of the fifth lens at the optical axis is reasonably configured, the bending degree of the fifth lens is further controlled, the processing difficulty of the fifth lens is reduced, meanwhile, the edge aberration of the optical system is corrected, the generation of astigmatism is restrained, and the imaging effect of the optical system is improved.

In one embodiment, the optical system satisfies the relationship: R61/R62 is more than 0.5 and less than 0.9; wherein R61 is a radius of curvature of the object side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image side surface of the sixth lens element at the optical axis. Specifically, the values of R61/R62 may be 0.721, 0.581, 0.551, 0.782, 0.741, 0.521, 0.869, 0.683, etc.

The optical system meets the relation, so that the ratio of the curvature radius of the object side surface of the sixth lens to the curvature radius of the image side surface of the sixth lens at the optical axis is reasonably configured, the bending degree of the sixth lens is further controlled, the processing difficulty of the sixth lens is reduced, meanwhile, the edge aberration of the optical system is corrected, the generation of astigmatism is restrained, and the imaging effect of the optical system is improved.

In one embodiment, the optical system satisfies the relationship: 0.8 < SD11/IH < 1.3; wherein SD11 is the maximum effective aperture of the object side surface of the first lens, and IH is the image height corresponding to the maximum field angle of the optical system. Specifically, the SD11/IH values may be 1.051, 1.082, 1.072, 1.032, 1.012, 0.836, 1.298, 1.167, etc.

By enabling the optical system to meet the relation, the ratio of the maximum effective caliber of the object side surface of the first lens to the image height corresponding to the maximum field angle of the optical system is controlled within a reasonable range, the effective caliber of the first lens is ensured to be kept within a reasonable range, the caliber of each lens is proper, the design and the manufacture of a miniaturized lens barrel are facilitated, the miniaturization feasibility is ensured, the compactness of the optical system structure is further improved, and meanwhile, the refractive power of the first lens to light is also facilitated to be improved, and distortion and aberration are further reduced. The aperture of the first lens is smaller than the lower limit of the relation, and the aperture of the first lens is not beneficial to the improvement of the imaging quality and the correction of distortion of the optical system because the aperture of the first lens is smaller than the image height corresponding to the maximum field angle of the optical system; exceeding the upper limit of the relation, the aperture of the first lens is excessively large with respect to the image height corresponding to the maximum field angle of the optical system, which is not conducive to miniaturization of the entire optical system and increases the optical total length of the optical system.

In some embodiments, the optical system further comprises a filter, which may be an infrared cut filter or an infrared band pass filter, the infrared cut filter being configured to filter out infrared light, the infrared band pass filter allowing only infrared light to pass. In the application, the optical filter is an infrared cut-off optical filter which is fixedly arranged relative to each lens in the optical system and is used for preventing infrared light from reaching an imaging surface of the optical system to interfere normal imaging. The filter may be assembled with each lens as part of the optical system, or in other embodiments, the filter may be a separate component from the optical system, and the filter may be mounted between the optical system and the photosensitive chip when the optical system is assembled with the photosensitive chip. It is understood that the optical filter may be made of an optical glass coating, or may be made of colored glass, or may be made of other materials, and may be selected according to actual needs, which is not specifically limited in this embodiment. In other embodiments, the filtering effect may also be achieved by providing a filtering coating on at least one of the first lens to the sixth lens.

First embodiment

Referring to fig. 1a, the optical system 10 of the present embodiment includes, in order from an object side to an image side along an optical axis:

the first lens element L1 with negative refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.

The second lens element L2 with positive refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region.

The third lens element L3 with positive refractive power has a concave object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.

The fourth lens element L4 with positive refractive power has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.

The fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a convex image-side surface S10 at a paraxial region of the fifth lens element L5.

The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.

In addition, the optical system 10 further includes a stop STO, a filter IR, and an imaging plane IMG. In the present embodiment, the stop STO is disposed between the image side surface of the second lens and the object side surface of the third lens of the optical system 10 for controlling the amount of light entering. The optical filter IR is disposed between the sixth lens L6 and the imaging plane IMG, and includes an object side surface S13 and an image side surface S14, and is an infrared cut-off filter, which is used for filtering infrared light, so that the light incident on the imaging plane IMG is only visible light, the wavelength of the visible light is 380nm-780nm, and the material of the infrared cut-off filter can be GLASS (GLASS) or Plastic (plastics), and can be coated on the surface thereof. The first lens L1 to the sixth lens L6 may be made of GLASS (GLASS) or Plastic (Plastic). The effective pixel area of the photosensitive chip is positioned on the imaging surface, the visible light photosensitive chip is arranged at the IMG of the imaging surface, and the photosensitive chip captures information of different wave bands of an object for subsequent processing.

Table 1a shows various parameters of the optical system 10 of the present embodiment, wherein the Y radius is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis. The surface numbers S1 and S2 are the object side surface S1 and the image side surface S2 of the first lens element L1, respectively, i.e., 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 in the same lens element. The first value in the "thickness" parameter row of the first lens element L1 is the thickness of the lens element on the optical axis, and the second value is the distance from the image side surface of the lens element to the rear surface in the image side direction on the optical axis. The focal length, the refractive index of the material and the Abbe number are all obtained by adopting visible light with a reference wavelength of 546nm, and the units of the radius, the thickness and the focal length of Y are all millimeters (mm).

TABLE 1a

Where f is the effective focal length of the optical system 10, FNO is the f-number of the optical system 10, FOV is the maximum field angle of the optical system 10, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, i.e. the total optical length.

In this embodiment, the object-side surface and the image-side surface of the second lens element L2, the object-side surface and the image-side surface of the third lens element L3, the object-side surface and the image-side surface of the fourth lens element L4, the object-side surface and the image-side surface of the fifth lens element L5, and the object-side surface and the image-side surface of the sixth lens element L6 are aspheric, and the aspheric profile x can be defined by, but not limited to, the following aspheric formulae:

Wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula. Table 1b shows the higher order coefficients A2, A4, A6, A8, a10, a12, a14, a16 of the aspherical mirror surfaces S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 that can be used in the first embodiment.

TABLE 1b

Face number	k	A2	A4	A6	A8
						S3	1.7169E-01	4.6810E-04	-9.8019E-04	9.3661E-04	4.2201E-04
S4	9.7225E-01	2.4893E-04	1.6288E-02	3.1178E-06	1.6504E-03
						S5	0.0000E+00	9.4672E-03	-1.8712E-02	-1.8841E-03	-5.6431E-03
S6	4.2407E-04	1.0771E-01	-1.5353E-02	7.5042E-03	-1.1590E-03
						S7	0.0000E+00	-1.0832E-02	-2.2828E-02	8.9429E-03	-2.0661E-03
S8	4.1811E-01	-1.2302E-01	-1.5411E-02	4.9932E-04	3.1023E-04
						S9	2.7016E-02	-2.1319E-01	3.0629E-02	-2.9902E-03	2.1339E-04
S10	0.0000E+00	2.0671E-02	1.0374E-02	5.0244E-03	-9.3839E-04
						S11	4.0056E-02	4.7284E-02	-2.7611E-02	5.2585E-03	-7.3973E-04
S12	0.0000E+00	-5.5833E-02	-3.5849E-03	-1.4825E-03	3.6013E-04
						Face number	A10	A12	A14	A16
S3	-8.7199E-05	-1.8396E-05	1.1765E-05	-1.5184E-06
						S4	-4.2479E-04	-3.6494E-04	3.1409E-04	-6.3115E-05
S5	3.2126E-03	-1.6975E-03	4.8977E-04	-1.5523E-04
						S6	2.9767E-06	6.9387E-05	-2.0384E-06	1.2278E-07
S7	3.4008E-04	-1.9485E-05	4.0503E-07	-1.6532E-08
						S8	-1.1778E-05	8.6494E-06	-8.2386E-07	3.6235E-08
S9	-2.4942E-05	7.5886E-06	1.4072E-06	-4.9885E-07
						S10	6.5546E-05	-7.3885E-07	-2.0387E-07	1.0944E-08
S11	7.2324E-05	-4.4763E-06	1.4926E-07	-2.0733E-09
						S12	-4.3776E-05	3.0477E-06	-1.1369E-07	1.6855E-09

Fig. 1b (a) shows: the optical system 10 of the first embodiment has a longitudinal spherical aberration curve at wavelengths 656.0000nm, 546.0000nm, 436.0000nm, wherein the abscissa along the X-axis represents the focus offset, i.e. the distance (in mm) from the imaging plane to the intersection of the light ray and the optical axis, the ordinate along the Y-axis represents the normalized field of view, and the longitudinal spherical aberration curve represents the focus offset of the light rays of different wavelengths after passing through the lenses of the optical system 10. As can be seen from fig. 1b (a), the degree of focus deviation of the light beams with different wavelengths in the first embodiment tends to be uniform, and the diffuse spots or halos in the imaging frame are effectively suppressed, which means that the imaging quality of the optical system 10 in this embodiment is better.

Fig. 1b (b) shows: the optical system 10 of the first embodiment has an astigmatic diagram at a wavelength of 546.0000nm, in which the abscissa in the X-axis direction represents the focus offset and the ordinate in the Y-axis direction represents the image height in mm. The S curve in the astigmatic plot represents the sagittal field curve at 546.0000nm and the T curve represents the meridional field curve at 546.0000 nm. As can be seen from fig. 1b (b), the curvature of field of the optical system 10 is small, the curvature of field and astigmatism of each field of view are well corrected, and the center and edges of the field of view have clear imaging.

Fig. 1b (c) shows: the optical system 10 of the first embodiment has a distortion curve at a wavelength of 546.0000 nm. Wherein, the abscissa along the X-axis direction represents the distortion value, the sign is given, and the ordinate along the Y-axis direction represents the image height in mm. The distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 1b (c), at a wavelength of 546.0000nm, the image distortion caused by the main beam is small and the imaging quality of the system is excellent.

As can be seen from (a), (b) and (c) in fig. 1b, the optical system 10 of the present embodiment has smaller aberration, better imaging quality, and good imaging quality.

Second embodiment

Referring to fig. 2a, the optical system 10 of the present embodiment includes, in order from an object side to an image side along an optical axis:

The other structures of the second embodiment are the same as those of the first embodiment, and reference is made thereto.

Table 2a shows parameters of the optical system 10 of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are obtained using visible light having a reference wavelength of 546nm, and the Y radius, thickness, and focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.

TABLE 2a

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Where f is the focal length of the optical system 10, FNO is the f-number of the optical system 10, FOV is the maximum angle of view of the optical system 10, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, i.e. the total optical length.

Table 2b gives the higher order coefficients that can be used for each aspherical mirror in the second embodiment, where each aspherical mirror profile can be defined by the formula given in the first embodiment.

TABLE 2b

Face number	k	A2	A4	A6	A8
						S3	-8.5277E-02	-1.7214E-02	-1.3823E-03	3.5448E-03	-6.0309E-05
S4	7.3402E-01	-3.9985E-03	3.9071E-03	5.5248E-03	2.2478E-04
						S5	0.0000E+00	1.1503E-03	-3.0830E-02	4.2610E-03	-3.6250E-03
S6	-1.3292E-01	9.7445E-02	-8.5418E-03	4.8028E-03	-8.5491E-04
						S7	0.0000E+00	3.5894E-04	-1.1976E-02	5.1878E-03	-1.7194E-03
S8	-4.9757E+00	-1.1803E-01	-1.5132E-02	9.5631E-04	4.2195E-04
						S9	1.9175E-01	-1.8544E-01	3.0560E-02	-3.0647E-03	3.6245E-04
S10	0.0000E+00	3.8718E-02	1.6039E-02	3.8128E-03	-9.0637E-04
						S11	5.3429E-01	3.7229E-02	-2.6236E-02	4.8500E-03	-6.8067E-04
S12	0.0000E+00	-3.6663E-02	-4.7460E-03	-1.3434E-03	3.4414E-04
						Face number	A10	A12	A14	A16
S3	-2.3968E-05	-3.1668E-05	1.4865E-05	-1.9236E-06
						S4	-3.6824E-04	-6.5660E-05	9.6985E-05	-1.8218E-05
S5	1.0069E-03	-1.5972E-03	1.0717E-03	-2.8502E-04
						S6	1.2056E-04	2.9770E-05	-1.2032E-05	2.0610E-06
S7	3.0711E-04	-3.8692E-05	5.2287E-06	-3.2345E-07
						S8	-3.9188E-05	-4.6191E-06	-6.5495E-07	2.6905E-07
S9	2.6206E-05	-1.4916E-06	-3.9067E-06	5.0064E-07
						S10	8.6960E-05	-3.2711E-06	-1.0614E-06	1.3991E-07
S11	6.9534E-05	-4.8198E-06	1.9391E-07	-3.4432E-09
						S12	-4.1952E-05	2.9513E-06	-1.1258E-07	1.7370E-09

Fig. 2b (a), (b) and (c) show the longitudinal spherical aberration curves, astigmatic curves and distortion curves of the optical system 10 at different focal lengths in the second embodiment, respectively, wherein the longitudinal spherical aberration curves represent the focus deviations of light rays of different wavelengths after passing through the lenses of the optical system 10; astigmatic curves represent meridian field curves and sagittal field curves; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 2b, the longitudinal spherical aberration, curvature of field and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Third embodiment

Referring to fig. 3a, the optical system 10 of the present embodiment includes, in order from an object side to an image side along an optical axis:

The other structures of the third embodiment are the same as those of the first embodiment, and reference is made thereto.

Table 3a shows parameters of the optical system 10 of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are obtained using visible light having a reference wavelength of 546nm, and the Y radius, thickness, and focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.

TABLE 3a

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Table 3b gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the third embodiment, where each of the aspherical surface types can be defined by the formula given in the first embodiment.

TABLE 3b

Face number	k	A2	A4	A6	A8
						S3	-1.0005E-01	-1.9205E-02	-1.4440E-03	3.6544E-03	-4.7636E-05
S4	7.2605E-01	-4.4359E-03	3.7528E-03	5.6578E-03	2.4165E-04
						S5	0.0000E+00	-3.0189E-04	-3.1230E-02	4.4186E-03	-3.6063E-03
S6	-1.3207E-01	9.5731E-02	-8.4652E-03	4.8726E-03	-8.5098E-04
						S7	0.0000E+00	1.7060E-03	-1.1801E-02	5.1677E-03	-1.7199E-03
S8	-6.6206E+00	-1.1800E-01	-1.5032E-02	9.9596E-04	4.2279E-04
						S9	1.8989E-01	-1.8533E-01	3.0630E-02	-3.0967E-03	3.6036E-04
S10	0.0000E+00	3.8622E-02	1.6020E-02	3.8289E-03	-9.0564E-04
						S11	5.7838E-01	3.4082E-02	-2.5897E-02	4.8329E-03	-6.8000E-04
S12	0.0000E+00	-3.6952E-02	-4.9761E-03	-1.3244E-03	3.4399E-04
						Face number	A10	A12	A14	A16
S3	-2.6381E-05	-3.2718E-05	1.4740E-05	-1.9110E-06
						S4	-3.6679E-04	-6.7423E-05	9.5690E-05	-1.8252E-05
S5	9.7106E-04	-1.6156E-03	1.0746E-03	-2.9035E-04
						S6	1.1535E-04	2.7989E-05	-1.2150E-05	2.2591E-06
S7	3.0756E-04	-3.8587E-05	5.2203E-06	-3.3576E-07
						S8	-3.9422E-05	-4.7010E-06	-6.8153E-07	2.6182E-07
S9	2.5756E-05	-1.5560E-06	-3.8892E-06	5.0961E-07
						S10	8.7303E-05	-3.2323E-06	-1.0657E-06	1.3577E-07
S11	6.9533E-05	-4.8221E-06	1.9386E-07	-3.4206E-09
						S12	-4.1958E-05	2.9518E-06	-1.1255E-07	1.7352E-09

Fig. 3b (a), (b) and (c) show the longitudinal spherical aberration curves, astigmatic curves and distortion curves of the optical system 10 at different focal lengths in the third embodiment, respectively, wherein the longitudinal spherical aberration curves represent the focus deviations of light rays of different wavelengths after passing through the lenses of the optical system 10; astigmatic curves represent meridian field curves and sagittal field curves; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 3b, the longitudinal spherical aberration, curvature of field and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Fourth embodiment

Referring to fig. 4a, the optical system 10 of the present embodiment includes, in order from an object side to an image side along an optical axis:

The other structures of the fourth embodiment are the same as those of the first embodiment, and reference is made thereto.

Table 4a shows parameters of the optical system 10 of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are obtained using visible light having a reference wavelength of 546nm, and the Y radius, thickness, and focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.

TABLE 4a

Table 4b gives the higher order coefficients that can be used for each aspherical mirror in the fourth embodiment, where each aspherical mirror profile can be defined by the formula given in the first embodiment.

TABLE 4b

Fig. 4b (a), (b) and (c) show the longitudinal spherical aberration curves, astigmatic curves and distortion curves of the optical system 10 at different focal lengths in the fourth embodiment, respectively, wherein the longitudinal spherical aberration curves represent the focus deviations of light rays of different wavelengths after passing through the lenses of the optical system 10; astigmatic curves represent meridian field curves and sagittal field curves; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 4b, the longitudinal spherical aberration, curvature of field and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Fifth embodiment

Referring to fig. 5a, the optical system 10 of the present embodiment includes, in order from an object side to an image side along an optical axis:

The other structures of the fifth embodiment are the same as those of the first embodiment, and reference is made thereto.

Table 5a shows parameters of the optical system 10 of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are obtained using visible light having a reference wavelength of 546nm, and the Y radius, thickness, and focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.

TABLE 5a

Table 5b gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the fifth embodiment, where each of the aspherical surface types can be defined by the formula given in the first embodiment.

TABLE 5b

Face number	k	A2	A4	A6	A8
						S3	1.5478E-01	3.0791E-03	-1.3117E-04	1.2918E-03	1.2392E-04
S4	1.1612E+00	3.4629E-03	1.4586E-02	-2.0191E-04	1.5823E-03
						S5	0.0000E+00	3.5214E-03	-2.3644E-02	-2.1423E-03	-5.2510E-03
S6	-2.3293E-02	1.0656E-01	-1.7294E-02	7.6780E-03	-1.1540E-03
						S7	0.0000E+00	-9.7349E-03	-2.2407E-02	8.7461E-03	-2.0389E-03
S8	8.2988E-01	-1.2629E-01	-1.5449E-02	9.8020E-05	2.7806E-04
						S9	6.6582E-01	-2.0887E-01	2.9287E-02	-2.6224E-03	2.5316E-04
S10	0.0000E+00	1.9384E-02	1.1434E-02	5.0621E-03	-8.8789E-04
						S11	-1.4450E-02	4.8477E-02	-2.7536E-02	5.3346E-03	-7.4282E-04
S12	0.0000E+00	-4.5488E-02	-4.6430E-03	-1.4356E-03	3.5681E-04
						Face number	A10	A12	A14	A16
S3	-3.7828E-05	-1.6410E-05	7.7279E-06	-9.2417E-07
						S4	-2.6609E-04	-3.7679E-04	2.1136E-04	-3.1316E-05
S5	2.8526E-03	-1.7882E-03	5.2580E-04	-1.4803E-04
						S6	1.0116E-05	6.9953E-05	-1.4183E-05	3.8070E-06
S7	2.4196E-04	-2.6767E-05	9.1098E-07	-2.7121E-08
						S8	-1.2586E-05	3.2226E-06	-3.4712E-06	3.2594E-07
S9	-3.5664E-05	4.3102E-06	1.8475E-06	-2.3520E-07
						S10	5.9252E-05	-1.3298E-06	-2.1730E-07	2.7209E-08
S11	7.2131E-05	-4.4865E-06	1.5200E-07	-2.0826E-09
						S12	-4.3668E-05	3.0539E-06	-1.1404E-07	1.6789E-09

Fig. 5b (a), (b) and (c) show the longitudinal spherical aberration curves, astigmatic curves and distortion curves of the optical system 10 at different focal lengths in the fifth embodiment, respectively, wherein the longitudinal spherical aberration curves represent the focus deviations of light rays of different wavelengths after passing through the lenses of the optical system 10; astigmatic curves represent meridian field curves and sagittal field curves; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 5b, the longitudinal spherical aberration, curvature of field and distortion of the optical system 10 are all well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Table 6 shows values of SD11/IH, f6/f, f6/RL, f4/f, |f4/f5|, |f3/f5|, f3/f4, |f2/f|, f1/f3, R51/R52, R61/R62, FOV/f in the optical systems of the first to fifth embodiments.

TABLE 6

	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment
						SD11/IH	1.051	1.082	1.072	1.032	1.012
f6/f	2.434	2.643	2.662	2.610	2.551
						f6/RL	0.912	0.952	0.943	1.011	1.014
f4/f	1.593	1.541	1.531	1.542	1.522
						\|f4/f5\|	1.501	1.472	1.462	1.422	1.420
\|f3/f5\|	1.67	1.632	1.634	1.653	1.701
						f3/f4	1.111	1.113	1.114	1.163	1.203
\|f2/f\|	5.134	13.619	15.090	6.193	5.362
						f1/f3	-0.872	-0.991	-0.992	-0.932	-0.874
R51/R52	0.901	0.851	0.854	0.902	0.903
						R61/R62	0.721	0.581	0.551	0.782	0.741
FOV/f(deg/mm)	49.621	49.311	49.342	49.342	48.861

As can be seen from table 6, the optical systems of the first to fifth embodiments all satisfy the following relations: SD11/IH is 0.8 < 1.3, f6/f is 2.0 < 3.5, f6/RL is 0.85 < 1.5, f4/f is 1.0 < 2.0, f4/f5 is 1.2 < |f4/f5| < 2.0, f3/f4 is 1.2, f2/f| < 16 is 5 < |f2/f| < 1.5 < f1/f3 < -0.6, R51/R52 is 0.0, R61/R62 is 0.9, 47deg/mm < FOV/f is 50 deg/mm.

Referring to fig. 6, the present application further provides an image capturing module 20, where the image capturing module 20 includes a photosensitive chip 21 and the optical system 10 according to any one of the embodiments of the first aspect, and the photosensitive chip 21 is disposed on an image side of the optical system 10. The photosurface of the photosurface 21 is positioned on the imaging surface of the optical system 10, and light rays of objects incident on the photosurface through the lens can be converted into electric signals of an image. The photo-sensing chip 21 may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a Charge-coupled Device (CCD). The camera module 20 may be an imaging module integrated on the electronic device 30 or may be a stand-alone lens. By adding the optical system 10 provided by the application into the image pickup module 20, the image pickup module 20 can meet the requirements of large angle of view, miniaturization and good imaging effect by reasonably designing the surface type and refractive power of each lens in the optical system 10.

Referring to fig. 7, the present application further provides an electronic device 30, where the electronic device 30 includes a housing 31 and the camera module 20, and the camera module 20 is disposed in the housing 31. The electronic device 30 includes, but is not limited to, an automobile, a monitor, a smart phone, a computer, a smart watch, and the like. By adding the camera module 20 provided by the application into the electronic equipment 30, the electronic equipment 30 can meet the requirements of larger field angle, miniaturization and good imaging effect.

The foregoing disclosure is only illustrative of the preferred embodiments of the present application and is not to be construed as limiting the scope of the application, as it is understood by those skilled in the art that all or part of the procedures described above may be performed and equivalents thereof may be substituted for elements thereof without departing from the scope of the application as defined in the claims.

Claims

1. An optical system, comprising, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a second lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

a third lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface at a paraxial region;

a fifth lens element with negative refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

A sixth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical system satisfies the relation: 47deg/mm < FOV/f < 50deg/mm;

wherein FOV is the maximum field angle of the optical system and f is the effective focal length of the optical system.

2. The optical system of claim 1, wherein the optical system satisfies the relationship:

2.0 < f6/f < 3.5, and/or

1.0 < f4/f < 2.0, and/or

5＜|f2/f|＜16；

Wherein f6 is an effective focal length of the sixth lens, f4 is an effective focal length of the fourth lens, and f2 is an effective focal length of the second lens.

3. The optical system of claim 1, wherein the optical system further comprises a diaphragm, and wherein the optical system satisfies the relationship:

0.85＜f6/RL＜1.5；

where f6 is an effective focal length of the sixth lens element, and RL is a distance between the aperture stop and an image side surface of the sixth lens element on an optical axis.

4. The optical system of claim 1, wherein the optical system satisfies the relationship:

1.2 < |f4/f5| < 2.0, and/or

1.0＜|f3/f5|＜2.0；

Wherein f4 is an effective focal length of the fourth lens, f3 is an effective focal length of the third lens, and f5 is an effective focal length of the fifth lens.

5. The optical system of claim 1, wherein the optical system satisfies the relationship:

0.8＜f3/f4＜1.2；

wherein f3 is an effective focal length of the third lens, and f4 is an effective focal length of the fourth lens.

6. The optical system of claim 1, wherein the optical system satisfies the relationship:

-1.5＜f1/f3＜-0.6；

wherein f1 is an effective focal length of the first lens, and f3 is an effective focal length of the third lens.

7. The optical system of claim 1, wherein the optical system satisfies the relationship:

0.8 < R51/R52 < 1.0, and/or

0.5＜R61/R62＜0.9；

Wherein R51 is a radius of curvature of the object-side surface of the fifth lens element at the optical axis, R52 is a radius of curvature of the image-side surface of the fifth lens element at the optical axis, R61 is a radius of curvature of the object-side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image-side surface of the sixth lens element at the optical axis.

8. The optical system of claim 1, wherein the optical system satisfies the relationship:

0.8＜SD11/IH＜1.3；

wherein SD11 is the maximum effective aperture of the object side surface of the first lens, and IH is the image height corresponding to the maximum field angle of the optical system.

9. An image pickup module comprising the optical system of any one of claims 1 to 8 and a photosensitive chip, the photosensitive chip being located on an image side of the optical system.

10. An electronic device comprising a housing and the camera module of claim 9, the camera module being disposed within the housing.