WO2022109820A1 - Optical system, camera module, and electronic device - Google Patents

Abstract

An optical system (10) comprises: a first lens (L1) having positive refractive power; a second lens (L2) having negative refractive power; a third lens (L3) having positive refractive power; a fourth lens (L4) having an object-side surface (S7) being concave in a paraxial region thereof and an image-side surface (S8) being convex in a paraxial region thereof; a fifth lens (L5) having positive refractive power, an aspheric object-side surface (S9) and an aspheric image-side surface (S10); and a sixth lens (L6) having negative refractive power, an aspheric object-side surface (S11) and an aspheric image-side surface (S12), at least one of the object-side surface (S11) and the image-side surface (S12) being provided with an inflection point. The system satisfies the following relationship: 0.25 < SD11/ImgH < 0.35, wherein SD11 is the maximum effective radius of an object-side surface (S1) of the first lens (L1), and ImgH is half of the image height corresponding to the maximum field of view of the optical system (10).

Description

Optical systems, camera modules and electronic equipment technical field

The invention relates to the technical field of photography and imaging, in particular to an optical system, a camera module and an electronic device.

Background technique

With the development of camera equipment, the current equipment has been able to place the camera on the side of the display screen by digging holes, so as to eliminate the structure that affects the screen ratio of the equipment such as large bezels and bangs. For a device with a screen-hole design, the structure of the camera largely determines the size of the screen's opening, which in turn affects the screen-to-body ratio of the device. On the other hand, when the object-end structure of the camera is controlled so that the size of the screen opening is excessively reduced, the amount of incoming light of the camera will be insufficient, resulting in lower image quality.

At present, the market has a great demand for devices with a high screen-to-body ratio. Therefore, how to design a camera that can cooperate with the display screen to increase the screen-to-body ratio of the device while maintaining good image quality has become the focus of the industry. One of the key points.

SUMMARY OF THE INVENTION

According to various embodiments of the present application, an optical system, a camera module, and an electronic device are provided.

An optical system, comprising in order from the object side to the image side:

a first lens having a positive refractive power;

a second lens having a negative refractive power;

a third lens having a positive refractive power;

The fourth lens with refractive power, the object side of the fourth lens is concave at the paraxial position, and the image side is convex at the paraxial position;

a fifth lens with positive refractive power, the object side and the image side of the fifth lens are both aspherical;

The sixth lens with negative refractive power, the object side and the image side of the sixth lens are both aspherical, and at least one of the object side and the image side is provided with an inflection point;

The optical system satisfies the relation:

0.25＜SD11/ImgH＜0.35;

SD11 is the maximum effective radius of the object side surface of the first lens, and ImgH is half of the image height corresponding to the maximum angle of view of the optical system.

A camera module includes an image sensor and the optical system described in any one of the above, wherein the image sensor is arranged on the image side of the optical system.

An electronic device includes a fixing member and the above-mentioned camera module, wherein the camera module is arranged on the fixing member.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present invention will become apparent from the description, drawings and claims.

Description of drawings

In order to better describe and illustrate embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the drawings should not be construed as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the best mode presently understood of these inventions.

1 is a schematic structural diagram of an optical system provided by a first embodiment of the present application;

FIG. 2 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the first embodiment;

3 is a schematic structural diagram of an optical system provided by a second embodiment of the present application;

FIG. 4 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the second embodiment;

5 is a schematic structural diagram of an optical system provided by a third embodiment of the present application;

6 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the third embodiment;

FIG. 7 is a schematic structural diagram of an optical system provided by a fourth embodiment of the present application;

FIG. 8 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fourth embodiment;

9 is a schematic structural diagram of an optical system provided by a fifth embodiment of the present application;

FIG. 10 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment;

11 is a schematic structural diagram of a camera module provided by an embodiment of the application;

FIG. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. 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 so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Referring to FIG. 1 , in the embodiment of the present application, the optical system 10 includes a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a sixth lens in sequence from the object side to the image side Lens L6, wherein the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power. The lenses in the optical system 10 are arranged coaxially, that is, the optical axes of the lenses are all located on the same straight line, and the straight line may be called the optical axis 101 of the optical system 10 . In addition, the lens referred to in this application is an optical element which has a refractive power.

The first lens L1 includes an object side S1 and an image side S2, the second lens L2 includes an object side S3 and an image side S4, the third lens L3 includes an object side S5 and an image side S6, and the fourth lens L4 includes an object side S7 and an image side S8, the fifth lens L5 includes an object side S9 and an image side S10, and the sixth lens L6 includes an object side S11 and an image side S12. In the embodiment of the present application, the object side surface S7 of the fourth lens L4 is a concave surface at the paraxial position, and the image side surface S8 is a convex surface at the paraxial position.

In addition, the optical system 10 has an imaging surface S13, and the imaging surface S13 is located on the image side of the sixth lens L6. Generally, the imaging surface S13 of the optical system 10 coincides with the photosensitive surface of the image sensor. For the convenience of understanding, the imaging surface S13 can be regarded as the photosensitive surface of the photosensitive element.

At least one of the object side surfaces and the image side surfaces of the first lens L1 to the sixth lens L6 is aspherical. In the embodiment of the present application, the object side surface and the image side surface of the fifth lens L5 and the sixth lens L6 are all aspherical surfaces. Further, the object side surface and the image side surface of the first lens L1 to the sixth lens L6 can also be designed as aspherical surfaces. The aspheric surface configuration can further help the optical system 10 to eliminate aberrations, solve the problem of distortion of the field of view, and at the same time, it is also conducive to the miniaturized design of the optical system 10, so that the optical system 10 can maintain the miniaturized design. optical effect. The aberration problem can be effectively eliminated through the cooperation of the aspherical surfaces, so that the optical system 10 has excellent imaging effect, and meanwhile the flexibility of lens design and assembly is improved. In addition, in the embodiment of the present application, at least one of the object side surface S11 and the image side surface S12 of the sixth lens L6 is provided with an inflection point.

It should be noted that the shape of the spherical or aspherical surface is not limited to the shape shown in the drawings, and the drawings are not drawn strictly to scale, and may differ from the actual surface structure of the lens.

For the calculation of the surface shape of the aspheric surface, please refer to the aspheric surface formula:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the aspheric surface The coefficient corresponding to the i-th higher-order term in the face formula.

On the other hand, in some embodiments, when the object side or the image side of a lens is aspherical, the surface may be an overall convex surface or an overall concave structure. Alternatively, the surface can also be designed to have an inflection point, and the shape of the surface will change from the center to the edge, for example, the surface is convex at the center and concave at the edge. It should be noted that when the embodiments of the present application describe that one side surface of the lens is convex at the optical axis (the central area of the side surface), it can be understood that the area of the side surface of the lens near the optical axis is convex, so It can also be considered that the side surface is convex at the paraxial position; when one side surface of the lens is described as concave at the circumference, it can be understood that the area of the side surface near the maximum effective aperture is concave. For example, when the side surface is convex at the paraxial position and is also convex at the circumference, the shape of the side surface from the center (optical axis) to the edge direction can be purely convex; or a convex shape from the center first Transitions to a concave shape and then becomes convex near the maximum effective aperture. This is only an example to illustrate the relationship between the optical axis and the circumference. The various shapes and structures (concave-convex relationship) of the side surface are not fully reflected, but other situations can be deduced from the above examples and should also be regarded as content described in this application.

In some embodiments, the material of each lens in the optical system 10 is plastic. Of course, the material of each lens in some embodiments may also be glass. The lens made of plastic can reduce the weight of the optical system 10 and the production cost, while the lens made of glass can withstand higher temperatures and have excellent optical effects. In other embodiments, the material of the first lens L1 is glass, and the material of the second lens L2 to the sixth lens L6 is all plastic. In this case, since the material of the lens on the object side in the optical system 10 is glass, Therefore, these glass lenses located on the object side have a good resistance to extreme environments, and are not easily affected by the object side environment and cause aging. Therefore, when the optical system 10 is in extreme environments such as exposure to high temperatures and other conditions, this structure can be more effective. A good balance between optical performance and cost of the system. Of course, the material configuration relationship of the lenses in the optical system 10 is not limited to the above-mentioned embodiment. The material of any lens can be plastic or glass, and the specific design can be determined according to actual needs.

In some embodiments, the optical system 10 includes an infrared cut filter 110 , and the infrared cut filter 110 is disposed on the image side of the sixth lens L6 and is relatively fixed to each lens in the optical system 10 . The infrared cut-off filter 110 is used to filter out infrared light to prevent the infrared light from reaching the imaging surface S13 of the system, thereby preventing the infrared light from interfering with normal imaging. The infrared cut filter 110 may be assembled with each lens as part of the optical system 10 . In other embodiments, the infrared cut-off filter 110 is not a component of the optical system 10 , and the infrared cut-off filter 110 can be installed on the optical system 10 and the photosensitive element to form a camera module. Between the system 10 and the photosensitive element. In some embodiments, the infrared cut filter 110 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, a filter coating layer may also be provided on at least one of the first lens L1 to the sixth lens L6 to achieve the effect of filtering out infrared light.

In the embodiment of the present application, the optical system 10 satisfies the relationship:

0.25＜SD11/ImgH＜0.35;

SD11 is the maximum effective radius of the object side surface S1 of the first lens L1 , and ImgH is half of the image height corresponding to the maximum angle of view of the optical system 10 . ImgH can also be referred to as half of the diagonal length of the effective imaging area of the optical system 10 on the imaging plane S13. And when the optical system 10 is assembled with the image sensor, ImgH can also be understood as half of the diagonal length of the rectangular photosensitive area of the image sensor. SD11/ImgH in some embodiments can be 0.27, 0.275, 0.28, 0.285, 0.29, 0.295, or 0.3. When the above relationship of SD11/ImgH is satisfied, the aperture of the object side S1 of the first lens L1 and the size of the imaging surface S13 of the system can be reasonably arranged, and the radial dimension of the first lens L1 can be reduced, so that the above-mentioned six-piece type can be obtained. The structured optical system 10 implements a small head design, thereby reducing the size of the opening on the screen of the device, thereby increasing the screen-to-body ratio of the device. In addition, satisfying this relationship is also conducive to the processing and molding of the first lens L1, and is also conducive to expanding the aperture, keeping the system with a good amount of incident light, so that the system has a high image quality. When the relationship between SD11/ImgH is higher than the upper limit, the radial dimension of the first lens L1 will be too large, making it difficult to achieve a small head design; Increasing off-axis aberration is not conducive to improving image quality.

In addition, in some embodiments, the optical system 10 also satisfies at least one of the following relationships, and when any relationship is satisfied, it can bring corresponding effects:

5<f3/f<45; f3 is the effective focal length of the third lens L3 , and f is the effective focal length of the optical system 10 . The f3/f in some embodiments may be 10, 10.5, 13, 15, 17, 20, 25, 30, 35, 40, 41, 42, or 42.5. When the above relationship is satisfied, the third lens L3 can enhance the focusing ability of the system to light, achieve good imaging quality, and at the same time help to shorten the total length of the system. When f3/f≤5.0, the positive refractive power of the third lens L3 is too strong, resulting in insufficient aberration correction capability of the image-side lens, resulting in high-order aberrations, affecting the imaging quality of the lens. When f3/f≥45, the equivalent positive refractive power of the third lens L3 is insufficient, which makes it difficult to shorten the total length of the system, which is not conducive to miniaturized design.

1.25<TTL/ImgH<1.35; TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S13 of the optical system 10 . The TTL/ImgH in some embodiments may be 1.28, 1.29, 1.3, 1.31 or 1.32. When the above relationship is satisfied, a high-quality imaging effect on a large image plane can be satisfied, and at the same time, the total length of the optical system 10 can be effectively reduced, thereby realizing a miniaturized design of the system in the axial direction.

0.65<ET56/CT56<1.65; ET56 is the distance from the maximum effective diameter of the image side S10 of the fifth lens L5 to the maximum effective diameter of the object side S11 of the sixth lens L6 in the direction of the optical axis, and CT56 is the image side of the fifth lens L5 The distance from S10 to the object side surface S11 of the sixth lens L6 on the optical axis. ET56/CT56 in some embodiments may be 0.7, 0.72, 0.75, 0.8, 0.9, 1, 1.2, 1.4, 1.5, 1.55, or 1.58. When the above relationship is satisfied, it is beneficial to the structural design between the fifth lens L5 and the sixth lens L6, and the distance between the fifth lens L5 and the sixth lens L6 on the edge is reduced, so as to facilitate the extension of the two lenses. A snap-fit or stacking structure can be formed, thereby omitting the spacer, thereby reducing the manufacturing cost, and it can also avoid that the interval between the fifth lens L5 and the sixth lens L6 is too small, which increases the sensitivity of the system and affects the imaging of the system. quality, which can better avoid the decline of lens assembly yield.

f/EPD≦2.1; f is the effective focal length of the optical system 10 , and EPD is the entrance pupil diameter of the optical system 10 . The f/EPD in some embodiments may be 1.9, 1.92, 1.94, 1.96, 1.98, 2, 2.03, 2.05. When the above relationship is satisfied, the optical system 10 has the characteristics of a large aperture, so that the luminous flux per unit time of the system can be increased, and the imaging effect in a dark environment can be enhanced.

-2.0<f2/R4<-1.0; f2 is the effective focal length of the second lens L2, and R4 is the radius of curvature of the image side S4 of the second lens L2 at the optical axis. f2/R4 in some embodiments may be -1.75, -1.70, -1.65, -1.6, -1.5, -1.45, -1.4, or -1.38. When the above relationship is satisfied, the second lens L2 can balance the positive spherical aberration generated by the first lens L1 to achieve good imaging quality, and at the same time, it is beneficial to the divergence of light rays, expands the field of view, and shortens the total length of the system. When f2/R4<-2.0, the negative refractive power provided by the second lens L2 is insufficient, it is difficult to correct the spherical aberration of the system, and the image side S4 of the second lens L2 is too curved, which is likely to cause lens tolerance sensitivity. When f2/R4>-1.0, the negative refractive power of the second lens L2 is too strong, and the light is too divergent, which is not conducive to shortening the total length of the system. In addition, it is easy to overcorrect the aberration generated by the first lens L1, thereby reducing imaging quality.

1.0mm<(R8/R7)*|R8-R7|<180.0mm; R7 is the curvature radius of the object side S7 of the fourth lens L4 at the optical axis, R8 is the image side S8 of the fourth lens L4 at the optical axis the radius of curvature. (R8/R7)*|R8-R7| in some embodiments may be 1.5, 2, 4, 5, 10, 30, 50, 60, 70, 100, 130, 150, 155, 158, or 160, in numerical units is mm. When the above relationship is satisfied, the curvature radius of the object side surface S7 of the fourth lens L4 and the curvature radius of the image side surface S8 of the fourth lens L4 can be appropriately configured, so that the shape of the fourth lens L4 will not be too curved, so that the correction system can be used. While astigmatic aberration can be reduced, the sensitivity of the system can also be reduced, which is beneficial to improve product yield.

5.0mm<(f5/f6)*R11<20.0mm; f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, and R11 is the curvature of the object side S11 of the sixth lens L6 at the optical axis radius. (f5/f6)*R11 in some embodiments may be 10.5, 11, 11.5, 12, 12.5, 13, 14, 14.5, 15, or 15.2, and the numerical unit is mm. When the above relationship is satisfied, controlling the ratio of the effective focal length of the fifth lens L5 to the effective focal length of the sixth lens L6 can effectively correct the system astigmatic aberration, and the correction of the curvature radius of the object side S11 of the sixth lens L6 can reduce the The light enters the incident angle of the object side S11 of the sixth lens L6, thereby avoiding the generation of stray light ghost images, and is conducive to compressing the total length of the optical lens and realizing the characteristics of thinning.

2.5<CT5/|SAG51|<5.5; CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the sagittal height of the object side surface S9 of the fifth lens L5 at the maximum effective radius. CT5/|SAG51| in some embodiments may be 3.1, 3.3, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, or 5.1. When the above relationship is satisfied, the shape of the fifth lens L5 can be well controlled, which is beneficial to the manufacture and molding of the lens, and reduces the defects of poor molding. At the same time, the field curvature generated by each lens on the object side can also be trimmed to ensure the balance of the field curvature of the system, that is, the field curvatures of different fields of view tend to be balanced, so that the image quality of the entire system can be uniform, thereby improving the optical system. 10 image quality. When CT5/|SAG51|<2.5, the surface shape of the object side surface S9 of the fifth lens L5 at the circumference is excessively curved, which will lead to poor molding and affect the manufacturing yield. When CT5/|SAG51|>5.5, the surface shape of the object side S9 of the fifth lens L5 at the circumference is too smooth, and the deflection ability of off-axis field rays is insufficient, which is not conducive to the correction of distortion and field curvature aberration.

It should be noted that the above-mentioned sagittal height is the center of the object side S9 of the fifth lens L5 (that is, the intersection of the object side S9 and the optical axis) to the maximum effective light aperture of the surface (that is, the maximum effective radius of the surface) in parallel light. The distance in the axis direction; when the value is positive, in the direction parallel to the optical axis of the system, the maximum effective clear aperture of the surface is closer to the image side of the system than the center of the surface; when When the value is negative, in the direction parallel to the optical axis of the system, the maximum effective clear aperture of the surface is closer to the object side of the system than the center of the surface.

0.85mm<FFL<1.30mm; FFL is the minimum distance in the optical axis direction from the image side surface S12 of the sixth lens L6 to the imaging surface S13 of the optical system 10 . The FFL in some embodiments may be 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, or 1.25, with values in mm. When the above relationship is satisfied, it is beneficial to maintain the miniaturization of the system, and to ensure a sufficient focusing range when the lens group and the image sensor are assembled. When FFL<0.85mm, the distance between the image side S12 of the sixth lens L6 and the imaging surface S13 of the system is too short, which easily causes the incident angle of the light to reach the imaging surface S13 to be too large, which affects the efficiency of the image sensor to receive light and reduces the Image quality. When FFL>1.3 mm, it is difficult to shorten the total length of the optical system 10, which is not conducive to maintaining the characteristics of the miniaturization of the system.

ImgH≥4.8mm; at this time, the optical system 10 has the characteristics of a large image plane, so that it can cooperate with a large-sized image sensor, thereby improving the imaging quality.

Next, the optical system 10 of the present application will be described with more specific and detailed embodiments:

first embodiment

Referring to FIGS. 1 and 2 , in the first embodiment, the optical system 10 includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side. The third lens L3 with positive refractive power, the fourth lens L4 with positive refractive power, the fifth lens L5 with positive refractive power, and the sixth lens L6 with negative refractive power. FIG. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the first embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 587.56 nm.

The object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is convex at the circumference.

The object side S3 of the second lens L2 is concave at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is concave at the circumference, and the image side S4 is concave at the circumference.

The object side S5 of the third lens L3 is concave at the paraxial position, and the image side S6 is convex at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.

The object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.

The object side S11 of the sixth lens L6 is concave at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is convex at the circumference, and the image side S12 is convex at the circumference.

The object side surface and the image side surface of each of the first lens L1 to the sixth lens L6 are aspherical. By matching the aspherical surface type of each lens in the optical system 10, the problem of the distortion of the field of view of the optical system 10 can be effectively solved, and the lens can also achieve excellent optical effects in the case of a small and thin lens, thereby enabling the optical system 10 to achieve an excellent optical effect. Having a smaller volume is beneficial to realize the miniaturized design of the optical system 10 . In addition, the material of each lens in the optical system 10 is plastic.

It should be noted that, in the first to fifth embodiments, the object side S9 and the image side S10 of the fifth lens L5 do not have inflection points, while the object side S11 and the image side S12 of the sixth lens L6 are provided with Inflection point. Therefore, the manufacturing difficulty of the fifth lens L5 can be simplified, and the ability to correct the aberrations of each field of view can be concentrated more on the last lens of the system.

The respective lens parameters of the optical system 10 are given in Tables 1 and 2 below. Table 2 shows the aspheric coefficients of the corresponding surfaces of the lenses in Table 1, where k is the conic coefficient, 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 (the imaging plane S13, which can also be understood as the photosensitive surface of the photosensitive element in the later assembly) are sequentially arranged in the order of the elements in Table 1 from top to bottom. However, it should be noted that when the description includes the aperture stop STO and the first lens L1 in sequence from the object side to the image side, it does not mean that the projection of the aperture stop STO on the optical axis can only be performed on the projection of the first lens L1. The object side also includes the case where the projection of the object side of the aperture stop STO and the object side of the first lens L1 on the optical axis overlaps, such as the arrangement in FIG. 1 . The surfaces corresponding to surface numbers 2 and 3 respectively represent the object side S1 and the image side S2 of the first lens L1, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. The Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number on the optical axis. The absolute value of the first value of the lens in the "Thickness" parameter column is the thickness of the lens on the optical axis, and the absolute value of the second value is the image side of the lens to the object side of the following optical element on the optical axis. on the distance. The optical axes of the lenses in the embodiments of the present application are on the same straight line, and the straight line serves as the optical axis of the optical system 10 . It should be noted that, in the following embodiments, the infrared cut-off filter 110 (ie, the infrared filter in the table) can be used as a component in the optical system 10 or not as a component in the optical system 10, but no matter what In this case, the distance from the image side S12 of the sixth lens L6 to the image surface S13 should be calculated into the value of the thickness parameter corresponding to the infrared cut filter 110 in the table.

In the first embodiment, the effective focal length of the optical system 10 is f=5.4mm, the aperture number FNO=2.07, the half of the maximum angle of view (that is, the half of the maximum angle of view in the diagonal direction) HFOV=82.0°, and the total optical length TTL= 6.268mm, half of the image height corresponding to the maximum angle of view ImgH=4.82mm. When equipped with an image sensor, ImgH can also be understood as half the diagonal length of the rectangular effective pixel area of the image sensor, and the diagonal direction of the optical system 10 is parallel to the diagonal direction of the effective pixel area.

In addition, in the parameter tables of the following embodiments (first embodiment to fifth embodiment), the reference wavelengths of the refractive index, Abbe number, and focal length of each lens are all 587.56 nm. In addition, the relational formula calculation and lens structure of each embodiment are based on lens parameters (such as Table 1, Table 2, Table 3, Table 4, etc.).

Table 1

Table 2

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

SD11/ImgH=0.27;

ImgH=4.82mm;

SD11 is the maximum effective radius of the object side surface S1 of the first lens L1 , and ImgH is half of the image height corresponding to the maximum angle of view of the optical system 10 . When the above relationship of SD11/ImgH is satisfied, the aperture of the object side S1 of the first lens L1 and the size of the imaging surface S13 of the system can be reasonably arranged, and the radial dimension of the first lens L1 can be reduced, so that the above-mentioned six-piece type can be obtained. The structured optical system 10 implements a small head design, thereby reducing the size of the opening on the screen of the device, thereby increasing the screen-to-body ratio of the device. In addition, satisfying this relationship is also beneficial to the processing and molding of the first lens L1, and is beneficial to expanding the aperture, keeping the system with a good amount of incident light, so that the optical system 10 has a good image quality. Further, the optical system 10 can also cooperate with the relationship of ImgH to realize the feature of a large image plane, which is beneficial to make the system have a higher image quality.

f3/f=17.01; f3 is the effective focal length of the third lens L3 , and f is the effective focal length of the optical system 10 . When the above relationship is satisfied, the third lens L3 can enhance the focusing ability of the system to light, achieve good imaging quality, and at the same time help to shorten the total length of the system.

TTL/ImgH=1.3; TTL is the distance on the optical axis from the object side surface of the first lens L1 to the imaging surface S13 of the optical system 10 . When the above relationship is satisfied, a high-quality imaging effect on a large image plane can be satisfied, and at the same time, the total length of the optical system 10 can be effectively reduced, thereby realizing a miniaturized design of the system in the axial direction.

ET56/CT56=0.723; ET56 is the distance from the maximum effective diameter of the image side S10 of the fifth lens L5 to the maximum effective diameter of the object side S11 of the sixth lens L6 in the optical axis direction, and CT56 is the image side of the fifth lens L5 S10 to The distance of the object side surface S11 of the sixth lens L6 on the optical axis. When the above relationship is satisfied, it is beneficial to the structural design between the fifth lens L5 and the sixth lens L6, and the distance between the fifth lens L5 and the sixth lens L6 on the edge is reduced, so as to facilitate the extension of the two lenses. A snap-fit or stacking structure can be formed, so as to omit the spacer, thereby reducing the manufacturing cost. In addition, it can also avoid that the interval between the fifth lens L5 and the sixth lens L6 is too small, which will increase the sensitivity of the system and affect the imaging quality of the system. , so that the lens assembly yield decline can be better avoided.

f/EPD=2.07; f is the effective focal length of the optical system 10 , and EPD is the entrance pupil diameter of the optical system 10 . When the above relationship is satisfied, the optical system 10 has the characteristics of a large aperture, so that the luminous flux per unit time of the system can be increased, and the imaging effect in a dark environment can be enhanced.

f2/R4=-1.365; f2 is the effective focal length of the second lens L2, and R4 is the radius of curvature of the image side surface S4 of the second lens L2 at the optical axis. When the above relationship is satisfied, the second lens L2 can balance the positive spherical aberration generated by the first lens L1 to achieve good imaging quality, and at the same time, it is beneficial to the divergence of light rays, expands the field of view, and shortens the total length of the system.

(R8/R7)*|R8-R7|=1.402mm; R7 is the curvature radius of the object side S7 of the fourth lens L4 at the optical axis, R8 is the curvature radius of the image side S8 of the fourth lens L4 at the optical axis . When the above relationship is satisfied, the curvature radius of the object side surface S7 of the fourth lens L4 and the curvature radius of the image side surface S8 of the fourth lens L4 can be appropriately configured, so that the shape of the fourth lens L4 will not be too curved, so that the correction system can be used. While astigmatic aberration can be reduced, the sensitivity of the system can also be reduced, which is beneficial to improve product yield.

(f5/f6)*R11=10.47mm; f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, and R11 is the curvature radius of the object side S11 of the sixth lens L6 at the optical axis. When the above relationship is satisfied, controlling the ratio of the effective focal length of the fifth lens L5 to the effective focal length of the sixth lens L6 can effectively correct the system astigmatic aberration, and the correction of the curvature radius of the object side S11 of the sixth lens L6 can reduce the The light enters the incident angle of the object side S11 of the sixth lens L6, thereby avoiding the generation of stray light ghost images, and is conducive to compressing the total length of the optical lens and realizing the characteristics of thinning.

CT5/|SAG51|=3.064; CT5 is the thickness of the fifth lens L5 on the optical axis, and SAG51 is the sag of the object side surface S9 of the fifth lens L5 at the maximum effective radius. When the above relationship is satisfied, the shape of the fifth lens L5 can be well controlled, which is beneficial to the manufacture and molding of the lens, and reduces the defects of poor molding. At the same time, the field curvature generated by each lens on the object side can also be trimmed to ensure the balance of the field curvature of the system, that is, the field curvatures of different fields of view tend to be balanced, so that the image quality of the entire system can be uniform, thereby improving the optical system. 10 image quality.

FFL=1.258mm; FFL is the minimum distance in the optical axis direction from the image side surface S12 of the sixth lens L6 to the imaging surface S13 of the optical system 10 . When the above relationship is satisfied, it is beneficial to maintain the miniaturization of the system, and ensure a sufficient focus range when the lens group and the image sensor are assembled.

In addition, FIG. 2 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical system 10, which represents the deviation of the converging focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration map represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the distance from the imaging plane S13 to the intersection of the light and the optical axis (unit is mm) . It can be seen from the longitudinal spherical aberration diagram that in the first embodiment, the degree of deviation of the converging focus of each wavelength light tends to be the same, and the smear or color halo in the imaging picture is effectively suppressed. FIG. 2 also includes a field curvature diagram (Astigmatic Field Curves) of the optical system 10, wherein the S curve represents the sagittal field curvature at 587.56 nm, and the T curve represents the meridional field curvature at 587.56 nm. It can be seen from the figure that the field curvature of the system is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images. FIG. 2 also includes a distortion diagram (Distortion) of the optical system 10. It can be seen from the diagram that the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.

Second Embodiment

3 and 4 , in the second embodiment, the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side. The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, and the sixth lens L6 with negative refractive power. FIG. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the second embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 587.56 nm.

The object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.

The object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.

The object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.

The object side S9 of the fifth lens L5 is convex at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.

The object side S11 of the sixth lens L6 is concave at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the second embodiment are given in Table 3 and Table 4, wherein the definitions of the structures and parameters can be obtained from the first embodiment, and will not be repeated here.

table 3

Table 4

The camera module 10 in this embodiment satisfies the following relationship:

SD11/ImgH

0.29

(R8/R7)*|R8-R7|

5.856

f3/f	42.02	(f5/f6)*R11	11.8
TTL/ImgH	1.323	CT5/|SAG51|	5.189
ET56/CT56	1.376	FFL	0.952
f/EPD	1.93	f2/R4	-1.743

It can be seen from the aberration diagram in FIG. 4 that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Third Embodiment

5 and 6 , in the third embodiment, the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side. The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, and the sixth lens L6 with negative refractive power. FIG. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the third embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 587.56 nm.

The object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.

The object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.

The object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.

The object side S9 of the fifth lens L5 is convex at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is convex at the circumference, and the image side S10 is convex at the circumference.

The object side S11 of the sixth lens L6 is concave at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the third embodiment are given in Table 5 and Table 6, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.

table 5

Table 6

The camera module 10 in this embodiment satisfies the following relationship:

SD11/ImgH	0.3	(R8/R7)*|R8-R7|	53.711
f3/f	23.75	(f5/f6)*R11	15.27
TTL/ImgH	1.327	CT5/|SAG51|	4.575
ET56/CT56	1.511	FFL	0.978
f/EPD	1.88	f2/R4	-1.69

It can be seen from the aberration diagram in FIG. 6 that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Fourth Embodiment

7 and 8 , in the fourth embodiment, the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side. The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, and the sixth lens L6 with negative refractive power. FIG. 7 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the fourth embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 587.56 nm.

The object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.

The object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.

The object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.

The object side S9 of the fifth lens L5 is convex at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is convex at the circumference, and the image side S10 is convex at the circumference.

The object side S11 of the sixth lens L6 is concave at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is convex at the circumference, and the image side S12 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the fourth embodiment are given in Table 7 and Table 8, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.

Table 7

Table 8

The camera module 10 in this embodiment satisfies the following relationship:

SD11/ImgH	0.288	(R8/R7)*|R8-R7|	160.636
f3/f	42.92	(f5/f6)*R11	14.46
TTL/ImgH	1.307	CT5/|SAG51|	4.023
ET56/CT56	1.58	FFL	0.89
f/EPD	1.88	f2/R4	-1.77

It can be seen from the aberration diagram in FIG. 8 that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Fifth Embodiment

Referring to FIGS. 9 and 10 , in the fifth embodiment, the optical system 10 includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side. The third lens L3 with positive refractive power, the fourth lens L4 with positive refractive power, the fifth lens L5 with positive refractive power, and the sixth lens L6 with negative refractive power. FIG. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the fifth embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 587.56 nm.

The object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.

The object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.

The object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is convex at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.

The object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.

The object side S11 of the sixth lens L6 is concave at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is convex at the circumference, and the image side S12 is convex at the circumference.

In addition, the lens parameters of the optical system 10 in the fifth embodiment are given in Table 9 and Table 10, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.

Table 9

Table 10

The camera module 10 in this embodiment satisfies the following relationship:

SD11/ImgH	0.273	(R8/R7)*|R8-R7|	4.22
f3/f	9.85	(f5/f6)*R11	12.98
TTL/ImgH	1.275	CT5/|SAG51|	3.086
ET56/CT56	0.687	FFL	1.15
f/EPD	2	f2/R4	-1.573

It can be seen from the aberration diagram in FIG. 10 that the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are well controlled, so that the optical system 10 of this embodiment has good imaging quality.

Referring to FIG. 11 , some embodiments of the present application further provide a camera module 20 . The camera module 20 may include the optical system 10 and the image sensor 210 of any one of the above-mentioned embodiments, and the image sensor 210 is disposed on the image of the optical system 10 . side. The image sensor 210 may be a CCD (Charge Coupled Device, charge coupled device) or a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor). Generally, when assembled, the imaging surface S15 of the optical system 10 overlaps the photosensitive surface of the image sensor 210 .

In some embodiments, the camera module 20 includes an infrared cut filter 110 disposed between the sixth lens L6 and the image sensor 210 , and the infrared cut filter 110 is used to filter out infrared light. In some embodiments, the infrared cut filter 110 may be mounted to the image end of the lens. In some embodiments, the camera module 20 further includes a protective glass, the protective glass is disposed between the infrared cut filter and the image sensor 210 , and the protective glass is used to protect the image sensor 210 .

By using the above optical system 10, the camera module 20 can realize a small head design, so that when used as the front camera module of the device, the size of the opening on the screen of the device can be reduced, thereby increasing the screen ratio of the device. In addition, it is also beneficial to improve the imaging quality of the system.

Referring to FIG. 12 , some embodiments of the present application further provide an electronic device 30 . The electronic device 30 includes a fixing member 310 , and the camera module 20 is mounted on the fixing member 310 . The fixing member 310 may be a display screen, a touch display screen, a circuit board, a middle frame, a back cover, and other components. The electronic device 30 can be, but is not limited to, a smartphone, a smart watch, a smart glasses, an e-book reader, an in-vehicle camera device, a monitoring device, a drone, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a Fingerprint recognition equipment or pupil recognition equipment, etc.), PDA (Personal Digital Assistant, personal digital assistant), drones, etc.

In particular, in some embodiments, the electronic device 30 includes a touch display screen, the camera module 20 is disposed on a side of the touch display screen away from the display surface, and the head of the camera module 20 faces the touch display screen to serve as a The front display module can also enable the electronic device 30 to have the function of under-screen camera. By using the above-mentioned camera module with a small head feature, the size of the opening on the screen can also be reduced, so that the screen ratio of the device can be increased, which is conducive to the realization of a full-screen design of the device.

The "electronic equipment" used in the embodiments of the present invention may include, but is not limited to, be configured to be connected via wired lines (eg, via a public switched telephone network (PSTN), a digital subscriber line, DSL), digital cable, direct cable connection, and/or another data connection/network) and/or via (eg, for cellular networks, wireless local area networks (WLAN), such as digital video broadcasting handheld, DVB-H) network digital television network, satellite network, AM-FM (amplitude modulation-frequency modulation, AM-FM) broadcast transmitter, and/or another communication terminal) wireless interface to receive/send communication signals installation. Electronic devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" and/or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that may combine cellular radio telephones with data processing, facsimile, and data communication capabilities; may include radio telephones, pagers, Internet/ Personal digital assistants (PDAs) with intranet access, web browsers, memo pads, calendars, and/or global positioning system (GPS) receivers; and conventional laptops and/or palmtops A receiver or other electronic device including a radiotelephone transceiver.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or element It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

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

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (22)

1. An optical system, comprising in order from the object side to the image side:

   a first lens having a positive refractive power;

   a second lens having a negative refractive power;

   a third lens having a positive refractive power;

   The fourth lens with refractive power, the object side of the fourth lens is concave at the paraxial position, and the image side is convex at the paraxial position;

   a fifth lens with positive refractive power, the object side and the image side of the fifth lens are both aspherical;

   The sixth lens with negative refractive power, the object side and the image side of the sixth lens are both aspherical, and at least one of the object side and the image side is provided with an inflection point;

   The optical system satisfies the relation:

   0.25＜SD11/ImgH＜0.35;

   SD11 is the maximum effective radius of the object side surface of the first lens, and ImgH is half of the image height corresponding to the maximum angle of view of the optical system.
2. The optical system according to claim 1, wherein the relationship is satisfied:

   5<f3/f<45;

   f3 is the effective focal length of the third lens, and f is the effective focal length of the optical system.
3. The optical system according to claim 1, wherein the relationship is satisfied:

   1.25<TTL/ImgH<1.35;

   TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system.
4. The optical system according to claim 1, wherein the relationship is satisfied:

   0.65＜ET56/CT56＜1.65;

   ET56 is the distance from the maximum effective diameter of the image side of the fifth lens to the maximum effective diameter of the object side of the sixth lens in the direction of the optical axis, and CT56 is the distance from the image side of the fifth lens to the sixth lens. The distance of the object side from the optical axis.
5. The optical system according to claim 1, wherein the relationship is satisfied:

   f/EPD≤2.1;

   f is the effective focal length of the optical system, and EPD is the entrance pupil diameter of the optical system.
6. The optical system according to claim 1, wherein the relationship is satisfied:

   -2.0＜f2/R4＜-1.0;

   f2 is the effective focal length of the second lens, and R4 is the radius of curvature of the image side of the second lens at the optical axis.
7. The optical system according to claim 1, wherein the relationship is satisfied:

   1.0mm＜(R8/R7)*|R8-R7|＜180.0mm;

   R7 is the radius of curvature of the object side of the fourth lens at the optical axis, and R8 is the radius of curvature of the image side of the fourth lens at the optical axis.
8. The optical system according to claim 1, wherein the relationship is satisfied:

   5.0mm＜(f5/f6)*R11＜20.0mm;

   f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and R11 is the radius of curvature of the object side of the sixth lens at the optical axis.
9. The optical system according to claim 1, wherein the relationship is satisfied:

   2.5＜CT5/|SAG51|＜5.5;

   CT5 is the thickness of the fifth lens on the optical axis, and SAG51 is the sag of the object side of the fifth lens at the maximum effective radius.
10. The optical system according to claim 1, wherein the relationship is satisfied:

    0.85mm＜FFL＜1.30mm;

    FFL is the minimum distance from the image side of the sixth lens to the image plane of the optical system in the direction of the optical axis.
11. The optical system according to claim 1, wherein the relationship is satisfied:

    ImgH≥4.8mm.
12. The optical system according to claim 1, wherein the object side of the first lens is convex at the paraxial position, and the image side surface is concave at the paraxial position.
13. The optical system according to claim 1, wherein the object side and the image side of the sixth lens are both concave at the paraxial position.
14. The optical system according to claim 1, wherein there is no inflection point on the object side and the image side of the fifth lens.
15. The optical system according to claim 1, wherein the optical system comprises an aperture stop, and the aperture stop is provided on the object side of the first lens.
16. The optical system according to any one of claims 1 to 15, wherein at least one of the first lens to the sixth lens is made of plastic.
17. The optical system according to claim 16, wherein the material of each lens in the first lens to the sixth lens is plastic.
18. The optical system according to any one of claims 1 to 15, wherein the object side and/or the image side of at least one of the first to sixth lenses are aspherical.
19. 19. The optical system according to claim 18, wherein in the first lens to the sixth lens, the object side surface and the image side surface of each lens are aspherical.
20. The optical system according to claim 1, wherein the optical system comprises an infrared cut filter, and the infrared cut filter is provided on the image side of the sixth lens.
21. A camera module, comprising an image sensor and the optical system according to any one of claims 1 to 20, wherein the image sensor is arranged on the image side of the optical system.
22. An electronic device, comprising a fixing member and the camera module according to claim 21, wherein the camera module is arranged on the fixing member.

Images