WO2022174438A1

WO2022174438A1 - Optical system, camera module and electronic device

Info

Publication number: WO2022174438A1
Application number: PCT/CN2021/077151
Authority: WO
Inventors: 徐标; 李明; 宋琦
Original assignee: 欧菲光集团股份有限公司; 江西晶超光学有限公司
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2022-08-25

Abstract

An optical system (10), comprising, sequentially from an object side to an image side along an optical axis (101), a first lens (L1) having a positive refractive power, an object side face (S1) of the first lens being convex near the optical axis, and an image side face (S2) thereof being concave near the optical axis; a second lens (L2) having a negative refractive power, an image side face (S4) of the second lens being concave near the optical axis; a third lens (L3); a fourth lens (L4); and a fifth lens (L5) having a negative refractive power, an image side face (S10) of the fifth lens being concave near the optical axis, and an image side face (S10) thereof having an inflection point. The optical system (10) satisfies the relationship: 1.0≤f12/f≤1.25, wherein f12 is the combined focal length of the first lens (L1) and the second lens (L2), and f is the effective focal length 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 photographic imaging technology, the imaging lens and image sensor in the camera module have been greatly improved, but the market demand for high shooting performance of electronic equipment is still only increasing.

At present, the five-piece imaging lens can achieve a good balance in terms of manufacturing cost and imaging quality, and there is also room for further development in terms of reducing manufacturing difficulty, cost, and improving imaging quality. In particular, in response to the market's further demand for shooting performance, how to further improve the five-piece imaging lens to improve its imaging quality has also become one of the focuses of the industry.

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 sequence from the object side to the image side along the optical axis:

The first lens with positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side is concave at the near optical axis;

a second lens with negative refractive power, the image side of the second lens is concave at the near optical axis;

a third lens having refractive power;

a fourth lens with refractive power;

A fifth lens with negative refractive power, the image side of the fifth lens is concave at the near optical axis, and there is an inflection point on the image side;

The optical system satisfies the relation:

1.0≤f12/f≤1.25;

f12 is the combined focal length of the first lens and the second lens, and f is the effective focal length 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 an optical system provided by a sixth embodiment of the present application;

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

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

FIG. 14 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 , an embodiment of the present application provides an optical system 10 having a five-piece structure. The optical system 10 includes a first lens L1 , a second lens L2 , a third lens L1 , a second lens L2 , and a third lens along the optical axis 101 from the object side to the image side in sequence. Lens L3, fourth lens L4 and fifth lens L5. 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 . Each of the above-described optical elements in the optical system 10 can be assembled with a lens barrel to constitute an imaging lens.

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. The optical system 10 also has an imaging surface S11, and the imaging surface S11 is located on the image side of the fifth lens L5. Generally, the imaging surface S11 of the optical system 10 coincides with the photosensitive surface of the image sensor. For the convenience of understanding, the imaging surface S11 can be regarded as the photosensitive surface of the image sensor.

In the embodiment of the present application, the first lens L1 has a positive refractive power, and its object side S1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the second lens L2 has a negative refractive power, The image side surface is concave at the near optical axis; the fifth lens L5 has negative refractive power, the image side surface S10 is concave at the near optical axis, and the image side surface S10 has an inflection point. In the above optical system 10, the first lens L1 provides a positive refractive power, which is conducive to the acquisition of object space information by the large aperture system to obtain a larger field of view and shorten the length of the system, while the second lens L2 to the fifth lens L5 is configured to balance the aberration generated by the first lens L1 through the above-mentioned refractive power and surface configuration.

It should be noted that when the embodiments of the present application describe that a surface of the lens is convex near the optical axis, it can be understood that the area of the surface of the lens near the optical axis 101 is convex; when describing a surface of the lens When it is concave near the maximum effective aperture or at the circumference, it can be understood that the area of the surface near the maximum effective aperture is concave. For example, when the surface is convex at the near optical axis and also convex at the circumference, the shape of the surface from the center (optical axis) to the edge direction can be purely convex; or first convex from the center The shape transitions to a concave shape and then becomes convex near the maximum effective aperture. The concave-convex surface type description in this application is only for the surface type of the effective light-transmitting area of the corresponding lens surface.

In the embodiment of the present application, the optical system 10 also satisfies the relational condition:

1.0≦f12/f≦1.25; f12 is the combined focal length of the first lens L1 and the second lens L2 , and f is the effective focal length of the optical system 10 . When the five-piece optical system 10 with the above-mentioned refractive power and surface design further satisfies the condition of the relational expression, the refractive power of the front lens group composed of the first lens L1 and the second lens L2 can be reasonably controlled, thereby achieving reasonable control. Effectively balance the distribution of the refractive power of the front lens group in the entire optical system 10, so as to balance the aberration generated by the rear lens group formed by the third lens L3 to the fifth lens L5, and avoid the front lens group due to excessive refractive power. The large aberrations make it difficult for the rear lens group to correct, thereby improving the imaging quality of the system; at the same time, it also enables the front lens group to have sufficient positive refractive power to effectively converge the incident light, thereby expanding the optical system 10 field of view. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 1.18, 1.19, 1.2, 1.21, 1.22 or 1.23.

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 technical effects:

0.4≤SAG41/CT4≤1.0; SAG41 is the sagittal height of the object side surface S7 of the fourth lens L4 at the maximum effective aperture, and CT4 is the thickness of the fourth lens L4 on the optical axis. It should be noted that the sag of the object side surface S7 of the fourth lens L4 at the maximum effective aperture should be understood as the distance from the intersection of the object side surface S7 and the optical axis 101 to the maximum effective aperture of the surface in the direction parallel to the optical axis. When SAG41 is a positive value, it means that the position of the maximum effective aperture of the object side S7 of the fourth lens L4 is closer to the object side than the position where the plane intersects with the optical axis 101, that is, the plane has a low middle and high edge. When the above relationship is satisfied, the surface shape of the object side S7 of the fourth lens L4 and the thickness of the lens can be reasonably controlled, so that the fourth lens L4 can be driven not to be too curved as a whole in structure, thus facilitating the processing and molding of the lens, reducing the The sensitivity of manufacturing can better realize engineering manufacturing; at the same time, the surface shape of the fourth lens L4 can not be too flat, so that the fourth lens L4, one of the last two lenses of the system, can prevent the astigmatism of the edge field of view. achieve good regulation. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.56, 0.58, 0.6, 0.62, 0.64 or 0.66.

1.0≤CT3/ET3≤1.5; CT3 is the thickness of the third lens L3 on the optical axis, and ET3 is the distance from the maximum effective aperture of the third lens L3 on the object side S5 to the maximum effective aperture on the image side S6 in the direction of the optical axis. When the above relationship is satisfied, on the one hand, the processing and molding of the third lens L3 is facilitated and the difficulty of assembly is reduced; on the other hand, the field curvature of the system can be effectively corrected and the imaging quality of the system can be improved. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 1.24, 1.25, 1.28, 1.3, 1.32, 1.33 or 1.35.

20≤|V4-V3|≤28; V3 is the Abbe number of the third lens L3, and V4 is the Abbe number of the fourth lens L4. When the above relationship is satisfied, the Abbe numbers of the third lens L3 and the fourth lens L4 can be controlled within a reasonable range, so that the aberration of the system can be improved, which is conducive to achromatic aberration, and the secondary spectrum of the system can be reduced, thereby improving the system. System imaging performance.

TTL/Imgh≤1.4; TTL is the distance on the optical axis from the object side S2 of the first lens L1 to the imaging surface S11 of the optical system 10 , and Imgh is half of the image height corresponding to the maximum field angle of the optical system 10 . When the above relationship is satisfied, on the one hand, the optical system 10 can be made to have ultra-thin characteristics, and the design requirements of system miniaturization can be achieved; sensor.

2≤|f2/f4|≤4; f2 is the effective focal length of the second lens L2, and f4 is the effective focal length of the fourth lens L4. When the above relationship is satisfied, the contribution of the refractive power of the second lens L2 and the fourth lens L4 in the optical system 10 can be reasonably distributed, so that the difference in the refractive power of the second lens L2 and the fourth lens L4 is reasonable and not too large. , but a better balance can be obtained, which can prevent the refractive force from being too concentrated in one of the lenses and cause the sensitivity of the lens to be too large, thereby better preventing the generation of field curvature and improving the imaging quality. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 2.08, 2.13, 2.2, 2.45, 2.6, 2.83, 2.95, 3.15, 3.37, 3.45, 3.5 or 3.55.

Fno≤1.9; Fno is the aperture number of the optical system 10 . When the above relationship is satisfied, it can ensure that the system has the characteristics of a large aperture, so that the optical system 10 has enough light input, so that the imaging is clearer, and high-quality imaging of low-brightness object space scenes such as night scenes and starry sky can be achieved.

0.4≤R9/R10≤1; R9 is the radius of curvature of the image side S8 of the fourth lens L4 at the optical axis, and R10 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis. When the above relationship is satisfied, the surface shape between the image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 can be reasonably configured, and the outgoing light from the image side S8 of the fourth lens L4 can be reasonably reduced. and the incident angle on the object side S9 of the fifth lens L5, thereby reducing the influence of the tolerance in the optical system 10 on the field of view, that is, the sensitivity of the field of view tolerance can be reduced, and the yield of the system can be improved. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.47, 0.475, 0.48, 0.5, 0.54, 0.63, 0.68, 0.72, 0.75, 0.79, 0.8, 0.82, 0.823 or 0.83.

0.5≤D4/CT5≤2.0; D4 is the distance from the image side S8 of the fourth lens L4 to the object side S9 of the fifth lens L5 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. When the above relationship is satisfied, the ratio of the distance between the fourth lens L4 to the fifth lens L5 and the thickness of the fifth lens L5 can be controlled within a reasonable range, so that the advanced aberrations generated by the system can be effectively balanced, and it is beneficial to engineering Field curvature adjustment in production to improve the imaging quality of the system. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.8, 0.86, 0.94, 1.14, 1.25, 1.38, 1.47, 1.56, 1.58 or 1.62.

0.8≤f1/f≤1.0; f1 is the effective focal length of the first lens L1. When the above relationship is satisfied, the refractive power contribution of the first lens L1 in the system can be reasonably allocated, on the one hand, the first lens L1 can better converge the light incident from the object space, thereby improving the field of view of the optical system 10 The range and the overall length of the optical system 10 can be shortened, and on the other hand, the first lens L1 can be prevented from generating excessive aberration, so that the system has good imaging quality. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.81, 0.82, 0.83, 0.84 or 0.85.

1.0≤TTL/f≤1.5; TTL is the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the imaging surface S11 of the optical system 10 . When the above relationship is satisfied, the length of the optical system 10 can be compressed, and the field angle of the system can be prevented from being too large, so that the optical system 10 can achieve a balance between miniaturized design and reduction of aberrations caused by a large field of view. When it is lower than the lower limit of the above relationship, the optical length of the optical system 10 is too short, which will increase the sensitivity of the system and make it difficult to correct the aberration; characteristic. When it exceeds the upper limit of the above relationship, the optical length of the optical system 10 is too long, which is not conducive to miniaturized design, and it is difficult for the light of the edge field of view to be imaged on the effective imaging area of the imaging surface, resulting in incomplete imaging information. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 1.143, 1.145, 1.147 or 1.149.

1.3mm≤Imgh ² /(TTL*Fno)≤2.0mm; Imgh is half of the image height corresponding to the maximum angle of view of the optical system 10 , and TTL is the image plane from the object side S1 of the first lens L1 to the imaging plane of the optical system 10 The distance of S11 on the optical axis 101 , and Fno is the aperture number of the optical system 10 . When the image sensor is assembled, Imgh can also be understood as the distance from the center of the rectangular effective pixel area of the image sensor to the diagonal edge. When the above relationship is satisfied, the maximum image height, the total optical length, and the number of apertures of the optical system 10 can be reasonably configured, so that the length of the system can not only be effectively compressed to achieve a miniaturized design, but also the system can have the characteristics of a large image surface and Sufficient light input, thereby improving image quality. In addition, when the above relationship is satisfied, it is also beneficial to further enable the optical system 10 to have the characteristics of a large field of view, so as to obtain more object space information.

The numerical reference wavelength related to the focal length in the above relational expression conditions is 555 nm, and the numerical reference wavelength related to the refractive index and Abbe number is both 587.56 nm. In addition, each of the above focal length parameters at least represents the focal length value of the corresponding lens at the near optical axis, and when describing what kind of refractive power the lens has, it also at least represents the refractive power of the corresponding lens at the near optical axis.

The above relational conditions and corresponding technical effects are aimed at the five-piece optical system 10 with the above-mentioned lens design. When it is impossible to ensure that the optical system 10 has the aforementioned lens design (number of lenses, refractive power configuration, surface configuration, etc.), it will be difficult to ensure that the system can still have corresponding technical effects when these relational conditions are met, and even significant imaging performance may occur. falling situation.

The optical system 10 includes an aperture stop STO, and the aperture stop STO is used to control the amount of light entering the optical system 10 and can also play a role of blocking ineffective light. When the projection of the aperture stop STO on the optical axis 101 overlaps with the projection of the object side S1 of the first lens L1 on the optical axis 101, it can also be considered that the aperture stop STO is arranged on the object side of the first lens L1. At least part of the structure of the object side surface S1 of the first lens L1 passes through the aperture stop STO toward the object side. The aperture stop STO may be provided on the object side of the first lens L1, or may be provided between the lenses. The aperture stop STO may be formed by a lens barrel structure that holds the lens, may be formed by a washer, or may be formed by a light-shielding coating on the surface of the lens.

In some embodiments, among the lens surfaces of the first lens L1 to the fifth lens L5, at least one lens surface is aspherical, that is, at least one of the first lens L1 to the fifth lens L5 has an aspherical surface. Specifically, in some embodiments, the object side surface and the image side surface of the first lens L1 to the fifth lens L5 are designed as aspherical surfaces. The aspheric surface configuration can further help the optical system 10 to better eliminate aberrations, and is also conducive to the miniaturized design of the optical system 10, so that the optical system 10 can have excellent optical effects while maintaining the miniaturized design. . Of course, in other embodiments, among the lens surfaces of the first lens L1 to the fifth lens L5, at least one lens surface is a spherical surface. The spherical surface type can effectively reduce the processing difficulty of the lens and balance the manufacturing cost. It should be noted that the actual surface shape of the lens is not limited to the spherical or aspherical shape shown in the drawings, which are for example reference only and are not drawn strictly to scale. In addition, it should be noted that when the object side or image side of a lens is aspherical, the surface can be a structure that exhibits a convex surface or a concave surface as a whole, or the surface can also be designed to have a structure with an inflection point. At this time, the shape of the face will change from the center to the edge, for example, the face will be convex at the center and concave at the edge.

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

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

On the other hand, in some embodiments, the material of at least one lens in the optical system 10 is plastic. Specifically, in some embodiments, the material of each lens in the optical system 10 may be plastic. Of course, in some embodiments, the material of at least one lens in the optical system 10 may also be glass. For example, each lens in some embodiments is made of 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. The material configuration relationship of the lenses in the optical system 10 is not limited to the above embodiments. The material of any lens can be plastic or glass, and the specific material configuration can be determined according to actual design requirements.

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 fifth lens L5 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 S11 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 filter 110 is not a component of the optical system 10, and the infrared cut filter 110 can be installed between the optical system 10 and the image sensor when the optical system 10 and the image sensor are assembled together. between. 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 fifth lens L5 to achieve the effect of filtering out infrared light.

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 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, and a first lens with negative refractive power from the object side to the image side along the optical axis 101 . Two lenses L2, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the first embodiment, and the reference wavelengths of the astigmatism diagram and the distortion diagram in the following embodiments are both 555 nm.

The object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; 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 near optical axis, and the image side S4 is concave at the near optical axis; 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 near optical axis, and the image side S6 is convex at the near optical axis; 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 near optical axis, and the image side S8 is convex at the near optical axis; 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 near optical axis, and the image side S10 is concave at the near optical axis; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.

In addition, the materials of the first lens L1 to the fifth lens L5 are all plastic, and the object side surface and the image side surface of each lens are aspherical surfaces.

In the above optical system 10, the first lens L1 provides a positive refractive power, which is conducive to the acquisition of object space information by the large aperture system to obtain a larger field of view and shorten the length of the system, while the second lens L2 to the fifth lens L5 is configured to balance the aberration generated by the first lens L1 through the above-mentioned refractive power and surface configuration.

The respective lens parameters of the optical system 10 in this embodiment are given in Tables 1 and 2 below. Table 2 presents the aspheric coefficients of the corresponding lens surfaces 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 type formula. The elements from the object side to the image side of the system are arranged in order from top to bottom in Table 1. The diaphragm in the table is the aperture diaphragm STO, and the infrared filter is the infrared cut filter. 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 is the radius of curvature of the corresponding surface of the lens at 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 distance from the image side of the lens to the following optical element on the optical axis . In the parameter tables of the following embodiments (the first embodiment to the sixth embodiment), the numerical reference wavelength of the refractive index and Abbe number of each lens is 587.56 nm, the numerical reference wavelength of the focal length is 555 nm, and the Y radius , thickness, and focal length (effective focal length) are in millimeters (mm). In addition, the relational calculation and lens structure of each embodiment are based on the data provided in the parameter tables (eg, Table 1, Table 2, Table 3, Table 4, etc.).

Table 1

It can be seen from Table 1 that the effective focal length f of the optical system 10 is 4.27 mm, the aperture number FNO is 1.89, the maximum field angle FOV is 81.1°, and the total optical length TTL is 4.9 mm. The rectangular effective pixel area of the image sensor has a diagonal direction. When the image sensor is assembled, the FOV can also be understood as the maximum field angle of the optical system 10 parallel to the diagonal direction.

Table 2

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

f12/f=1.23; f12 is the combined focal length of the first lens L1 and the second lens L2 , and f is the effective focal length of the optical system 10 . When the five-piece optical system 10 with the above-mentioned refractive power and surface design further satisfies this relationship, the refractive power of the front lens group composed of the first lens L1 and the second lens L2 can be reasonably controlled, thereby effectively balancing The refractive power of the front lens group is distributed in the entire optical system 10, so as to balance the aberrations generated by the rear lens group formed by the third lens L3 to the fifth lens L5, and prevent the front lens group from being caused by excessive refractive power. The larger aberration makes it difficult for the rear lens group to correct, thereby improving the imaging quality of the system; at the same time, it also enables the front lens group to have sufficient positive refractive power to effectively converge the incident light, thereby expanding the viewing angle of the optical system 10 . field range.

SAG41/CT4=0.64; SAG41 is the sagittal height of the object side surface S7 of the fourth lens L4 at the maximum effective aperture, and CT4 is the thickness of the fourth lens L4 on the optical axis. When the above relationship is satisfied, the surface shape of the object side S7 of the fourth lens L4 and the thickness of the lens can be reasonably controlled, so that the fourth lens L4 can be driven not to be too curved as a whole in structure, thus facilitating the processing and molding of the lens, reducing the The sensitivity of manufacturing can better realize engineering manufacturing; at the same time, the surface shape of the fourth lens L4 can not be too flat, so that the fourth lens L4, one of the last two lenses of the system, can prevent the astigmatism of the edge field of view. achieve good regulation.

CT3/ET3=1.28; CT3 is the thickness of the third lens L3 on the optical axis, and ET3 is the distance from the third lens L3 at the maximum effective aperture of the object side S5 to the maximum effective aperture of the image side S6 in the direction of the optical axis. When the above relationship is satisfied, on the one hand, the processing and molding of the third lens L3 is facilitated and the difficulty of assembly is reduced; on the other hand, the field curvature of the system can be effectively corrected and the imaging quality of the system can be improved.

|V4-V3|=27.6; V3 is the Abbe number of the third lens L3, and V4 is the Abbe number of the fourth lens L4. When the above relationship is satisfied, the Abbe numbers of the third lens L3 and the fourth lens L4 can be controlled within a reasonable range, so that the aberration of the system can be improved, which is conducive to achromatic aberration, and the secondary spectrum of the system can be reduced, thereby improving the system. System imaging performance.

TTL/Imgh=1.32; TTL is the distance on the optical axis from the object side S2 of the first lens L1 to the imaging surface S11 of the optical system 10 , and Imgh is half of the image height corresponding to the maximum angle of view of the optical system 10 . When the above relationship is satisfied, on the one hand, the optical system 10 can be made to have ultra-thin characteristics, and the design requirements of system miniaturization can be achieved; sensor.

|f2/f4|=3.13; f2 is the effective focal length of the second lens L2, and f4 is the effective focal length of the fourth lens L4. When the above relationship is satisfied, the contribution of the refractive power of the second lens L2 and the fourth lens L4 in the optical system 10 can be reasonably distributed, so that the refractive power intensity of the two lenses will not be too large, so that the field curvature can be better prevented. produce.

Fno=1.89; Fno is the aperture number of the optical system 10 . When the above relationship is satisfied, it can ensure that the system has the characteristics of a large aperture, so that the optical system 10 has enough light input, so that the imaging is clearer, and high-quality imaging of low-brightness object space scenes such as night scenes and starry sky can be achieved.

R9/R10=0.48; R9 is the radius of curvature of the image side S8 of the fourth lens L4 at the optical axis, and R10 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis. When the above relationship is satisfied, the surface shape between the image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 can be reasonably configured, so that the light rays on the image side S8 of the fourth lens L4 can be reasonably reduced. The exit angle and the incident angle on the object side S9 of the fifth lens L5 can reduce the influence of the tolerance in the optical system 10 on the field of view, reduce the tolerance sensitivity of the field of view, and improve the yield of the system.

D4/CT5=0.85; D4 is the distance from the image side S8 of the fourth lens L4 to the object side S9 of the fifth lens L5 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. When the above relationship is satisfied, the ratio of the distance between the fourth lens L4 to the fifth lens L5 and the thickness of the fifth lens L5 can be controlled within a reasonable range, so that the advanced aberrations generated by the system can be effectively balanced, and it is beneficial to engineering Field curvature adjustment in production to improve the imaging quality of the system.

f1/f=0.82; f1 is the effective focal length of the first lens L1. When the above relationship is satisfied, the refractive power contribution of the first lens L1 in the system can be reasonably allocated, on the one hand, the first lens L1 can better converge the light incident from the object space, thereby improving the field of view of the optical system 10 The range and the overall length of the optical system 10 can be shortened, and on the other hand, the first lens L1 can be prevented from generating excessive aberration, so that the system has good imaging quality.

TTL/f=1.15; TTL is the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the imaging surface S11 of the optical system 10 . When the above relationship is satisfied, the length of the optical system 10 can be compressed, and the field angle of the system can be prevented from being too large, so that the optical system 10 can achieve a balance between miniaturized design and reduction of aberrations caused by a large field of view.

Imgh ² /(TTL*Fno)=1.49mm; Imgh is half of the image height corresponding to the maximum angle of view of the optical system 10, and TTL is the difference between the object side S1 of the first lens L1 and the imaging surface S11 of the optical system 10 The distance on the axis 101, Fno is the aperture number of the optical system 10. When the image sensor is assembled, Imgh can also be understood as the distance from the center of the rectangular effective pixel area of the image sensor to the diagonal edge. When the above relationship is satisfied, the maximum image height, the total optical length, and the number of apertures of the optical system 10 can be reasonably configured, so that the length of the system can not only be effectively compressed to achieve a miniaturized design, but also the system can have the characteristics of a large image surface and Sufficient light input, thereby improving image quality. In addition, when the above relationship is satisfied, it is also beneficial to further enable the optical system 10 to have the characteristics of a large field of view, so as to obtain more object space information.

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 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 555 nm, and the T curve represents the meridional field curvature at 555 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. 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, the maximum distortion is controlled within 2%, and the imaging quality of the system is excellent.

Second Embodiment

Referring to FIGS. 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, and a first lens with negative refractive power from the object side to the image side along the optical axis 101 . Two lenses L2, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. FIG. 4 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the second embodiment.

The object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; 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 concave at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.

The object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is concave at the near optical axis; the object side S9 is convex at the circumference, and the image side S10 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 optical system 10 in this embodiment satisfies the following relationship:

f12/ff12/f	1.201.20	FnoFno	1.891.89
SAG41/CT4SAG41/CT4	0.660.66	R9/R10R9/R10	0.4680.468
CT3/ET3CT3/ET3	1.291.29	D4/CT5D4/CT5	0.780.78
\|V4-V3\|\|V4-V3\|	27.6027.60	f1/ff1/f	0.810.81
TTL/ImghTTL/Imgh	1.321.32	TTL/fTTL/f	1.141.14
\|f2/f4\|\|f2/f4\|	3.263.26	Imgh ²/(TTLFno) Imgh ² /(TTLFno)	1.491.49

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, and a first lens with negative refractive power from the object side to the image side along the optical axis 101. Two lenses L2, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. FIG. 6 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the third embodiment.

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 optical system 10 in this embodiment satisfies the following relationship:

f12/ff12/f	1.181.18	FnoFno	1.891.89
SAG41/CT4SAG41/CT4	0.560.56	R9/R10R9/R10	0.5060.506
CT3/ET3CT3/ET3	1.241.24	D4/CT5D4/CT5	1.091.09
\|V4-V3\|\|V4-V3\|	27.6027.60	f1/ff1/f	0.850.85
TTL/ImghTTL/Imgh	1.321.32	TTL/fTTL/f	1.151.15
\|f2/f4\|\|f2/f4\|	3.563.56	Imgh ²/(TTLFno) Imgh ² /(TTLFno)	1.491.49

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

Referring to FIGS. 7 and 8 , in the fourth embodiment, the optical system 10 includes an aperture stop STO, a first lens L1 with a positive refractive power, and a first lens with a negative refractive power from the object side to the image side along the optical axis 101 in sequence. Two lenses L2, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. FIG. 8 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the fourth embodiment.

The object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis; the object side S5 is concave at the circumference, and the image side S6 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 optical system 10 in this embodiment satisfies the following relationship:

f12/ff12/f	1.191.19	FnoFno	1.891.89
SAG41/CT4SAG41/CT4	0.610.61	R9/R10R9/R10	0.4760.476
CT3/ET3CT3/ET3	1.241.24	D4/CT5D4/CT5	0.920.92

\|V4-V3\|\|V4-V3\|	27.6027.60	f1/ff1/f	0.830.83
TTL/ImghTTL/Imgh	1.321.32	TTL/fTTL/f	1.151.15
\|f2/f4\|\|f2/f4\|	3.503.50	Imgh ²/(TTLFno) Imgh ² /(TTLFno)	1.491.49

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 better 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 a positive refractive power, and a first lens with a negative refractive power from the object side to the image side along the optical axis 101 in sequence. Two lenses L2, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. FIG. 10 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the fifth embodiment.

The object side S7 of the fourth lens L4 is convex at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave at the circumference, and the image side S8 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 optical system 10 in this embodiment satisfies the following relationship:

f12/ff12/f	1.211.21	FnoFno	1.891.89
SAG41/CT4SAG41/CT4	0.560.56	R9/R10R9/R10	0.5980.598
CT3/ET3CT3/ET3	1.351.35	D4/CT5D4/CT5	0.680.68
\|V4-V3\|\|V4-V3\|	27.6027.60	f1/ff1/f	0.830.83
TTL/ImghTTL/Imgh	1.321.32	TTL/fTTL/f	1.151.15
\|f2/f4\|\|f2/f4\|	3.193.19	Imgh ²/(TTLFno) Imgh ² /(TTLFno)	1.491.49

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.

Sixth Embodiment

Referring to FIGS. 11 and 12 , in the sixth embodiment, the optical system 10 includes an aperture stop STO, a first lens L1 having a positive refractive power, a first lens having a negative refractive power and a Two lenses L2, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, and a fifth lens L5 with negative refractive power. FIG. 12 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the sixth embodiment.

In addition, the lens parameters of the optical system 10 in the sixth embodiment are given in Table 11 and Table 12, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.

Table 11

Table 12

The optical system 10 in this embodiment satisfies the following relationship:

f12/ff12/f	1.231.23	FnoFno	1.881.88
SAG41/CT4SAG41/CT4	0.620.62	R9/R10R9/R10	0.8350.835
CT3/ET3CT3/ET3	1.341.34	D4/CT5D4/CT5	1.631.63
\|V4-V3\|\|V4-V3\|	27.6027.60	f1/ff1/f	0.830.83
TTL/ImghTTL/Imgh	1.321.32	TTL/fTTL/f	1.141.14
\|f2/f4\|\|f2/f4\|	2.062.06	Imgh ²/(TTLFno) Imgh ² /(TTLFno)	1.491.49

It can be seen from the aberration diagram in FIG. 12 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.

The optical system 10 in the above-mentioned first to sixth embodiments can have the characteristics of a large image plane and a large aperture through the reasonable combination design of the refractive power, structure and parameter relationship of the lens, so that the optical system can realize High-pixel, high-resolution imaging effects, and can also meet clear imaging in dark environments.

Referring to FIG. 13 , some embodiments of the present application further provide a camera module 20 . The camera module 20 may include an optical system 10 and an image sensor 210 , and the image sensor 210 is disposed on the image side of the optical system 10 . The image sensor 210 may be a CCD sensor (Charge Coupled Device, charge coupled device) or a CMOS sensor (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor). Generally, when assembled, the imaging surface S11 of the optical system 10 overlaps the photosensitive surface of the image sensor 210 .

The optical system 10 in the present application can achieve good correction of aberrations, so by using the optical system 10 , the imaging quality of the camera module 20 can be improved.

Referring to FIG. 14 , 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 , and the fixing member 310 may be a 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, a 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. By using the above-mentioned camera module 20 , the electronic device 30 can have good photographing performance.

The "electronic device" 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), 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 broadcast 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/transmit 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 orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. 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, terms such as "installation", "connection", "connection", "fixation" 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 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 of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also 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

An optical system, comprising in sequence from the object side to the image side along the optical axis:

The first lens with positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side is concave at the near optical axis;

a second lens with negative refractive power, the image side of the second lens is concave at the near optical axis;

a third lens having refractive power;

a fourth lens with refractive power;

A fifth lens with negative refractive power, the image side of the fifth lens is concave at the near optical axis, and there is an inflection point on the image side;

The optical system satisfies the relation:

1.0≤f12/f≤1.25;

f12 is the combined focal length of the first lens and the second lens, and f is the effective focal length of the optical system.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

0.4≤SAG41/CT4≤1.0;

SAG41 is the sag of the object side of the fourth lens at the maximum effective aperture, and CT4 is the thickness of the fourth lens on the optical axis.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

1.0≤CT3/ET3≤1.5;

CT3 is the thickness of the third lens on the optical axis, and ET3 is the distance from the maximum effective aperture on the object side of the third lens to the maximum effective aperture on the image side in the direction of the optical axis.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

2≤|f2/f4|≤4;

f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

0.4≤R9/R10≤1;

R9 is the radius of curvature of the image side of the fourth lens at the optical axis, and R10 is the radius of curvature of the object side of the fifth lens at the optical axis.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

0.5≤D4/CT5≤2.0;

D4 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

0.8≤f1/f≤1.0;

f1 is the effective focal length of the first lens.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

1.0≤TTL/f≤1.5;

TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system.
The optical system according to claim 1, wherein the fourth lens has a positive refractive power, and the object side of the fourth lens is concave at the near optical axis, and the image side is convex at the near optical axis ; The object side of the fifth lens is concave at the near optical axis.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

1.18≤f12/f≤1.23.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

20≤|V4-V3|≤28;

V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

TTL/Imgh≤1.4;

TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and Imgh is half of the image height corresponding to the maximum angle of view of the optical system.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

Fno≤1.9;

Fno is the aperture number of the optical system.
The optical system according to claim 1, wherein the optical system satisfies the relationship:

1.3mm≤Imgh2/(TTL*Fno)≤2.0mm;

Imgh is half of the image height corresponding to the maximum angle of view of the optical system, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and Fno is the optical system aperture number.
The optical system according to any one of claims 1 to 14, wherein the optical system comprises an aperture stop, and the aperture stop is provided on the object side of the first lens.
The optical system according to any one of claims 1 to 14, wherein at least one of the first lens to the fifth lens has an aspherical surface type.
The optical system according to claim 16, wherein the object side surface and the image side surface of each of the first lens to the fifth lens are aspherical.
The optical system according to any one of claims 1 to 14, wherein a material of at least one of the first lens to the fifth lens is plastic.
The optical system according to claim 18, wherein the material of each lens in the first lens to the fifth lens is plastic.
A camera module, comprising an image sensor and the optical system according to any one of claims 1 to 19, wherein the image sensor is arranged on the image side of the optical system.
An electronic device, comprising a fixing member and the camera module according to claim 20, wherein the camera module is arranged on the fixing member.