WO2021102749A1

WO2021102749A1 - Optical imaging system, image capture apparatus, and electronic device

Info

Publication number: WO2021102749A1
Application number: PCT/CN2019/121320
Authority: WO
Inventors: 蔡雄宇; 兰宾利; 周芮
Original assignee: 天津欧菲光电有限公司
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2021-06-03

Abstract

The present application provides an optical imaging system, comprising, in sequence from the object side to the image side: a first lens assembly having a positive focal power; a second lens assembly having a positive refractive power; and a third lens assembly having a negative refractive power; the first lens assembly comprising a first lens, the object side face of the first lens being a convex surface, the image side face being a convex surface or a flat surface; the second lens assembly comprising two lenses; the third lens assembly comprising two lenses. The optical imaging system of the present application has high pixel resolution and a small volume. In addition, the present application also provides an image capture apparatus and an electronic device.

Description

Optical imaging system, imaging device and electronic equipment

Technical field

This application relates to optical imaging technology, and in particular to an optical imaging system, image capturing device and electronic equipment.

Background technique

With the popularization of automobiles, traffic accidents caused by factors such as fatigue driving frequently occur. Nowadays, the automotive industry is developing rapidly. ADAS (Advanced Driving Assistant System), DMS (Driver Monitor System, driving warning system) and other technologies for in-vehicle driving have gradually matured, and the development of these in-vehicle technologies is inseparable from camera technology. . However, the existing camera devices that meet the requirements of vehicle miniaturization have low resolution and cannot monitor the driver's state well. According to the eye state, the number of closed eyes, the magnitude of closed eyes, yawning, facial state, etc. The information is estimated to determine whether the driver is driving fatigued, so as to provide early warning and improve driving safety.

Application content

In view of this, the present application provides an optical imaging system with high pixel resolution.

It is also necessary to provide an imaging device using the above-mentioned optical imaging system.

In addition, it is also necessary to provide an electronic device using the above-mentioned orientation device.

An optical imaging system, which sequentially includes from the object side to the image side:

A first lens group with positive refractive power;

A second lens group with positive refractive power; and

A third lens group with negative refractive power;

Wherein, the first lens group includes a first lens, the object side of the first lens is a convex surface, and the image side is a convex or flat surface; the object side of the first lens is a convex surface, which can strengthen the second lens that undertakes the main imaging function of the optical imaging system. The positive refractive power of a lens is conducive to ultra-thinness. The image side surface of the first lens is set as a plane, so that the optical imaging system is easy to assemble and support, and the assembly sensitivity of the lens is reduced, which is beneficial to improve the yield rate and reduce the production cost of the lens.

The second lens group includes two lenses; the third lens group includes two lenses.

Wherein, the second lens group includes a second lens with negative refractive power and a third lens with positive refractive power. The second lens and the third lens provide positive optical power for the entire optical imaging system, which can converge the large-angle light entering the system and optimize the phase difference of the large-angle field of view.

Wherein, the object side surface of the second lens is a concave surface, and the image side surface is a convex or concave surface; the object side surface and the image side surface of the third lens are both convex surfaces. The reasonable configuration of the shapes in the second lens group can increase the imaging field of view, so that the light beam carrying the object information can be effectively taken into the optical imaging system and transmitted to the imaging surface.

Wherein, the third lens group includes a fourth lens with negative refractive power and a fifth lens with refractive power. By arranging the third lens group with negative refractive power, the exit angle of the exit optical system is reduced, and at the same time, the angle at which the light enters the imaging surface is reduced, and the photosensitive performance is improved.

Wherein, the object side surface of the fourth lens is a concave surface, and the image side surface is a concave or convex surface; the object side surface of the fifth lens is a concave surface or a convex surface, and the image side surface is a concave surface, a convex surface or a flat surface. The reasonable configuration of the shape is beneficial to correct the field area of the front lens group, optimize the aberration of the optical imaging system, and improve the imaging resolution.

When the image side surface of the fifth lens is set as a plane, the optical imaging system is easy to assemble and bear, and the assembly sensitivity of the lens is reduced, which is beneficial to improve the yield rate and reduce the production cost of the lens.

Wherein, one of the first lens group, the second lens group and the third lens group is an aspheric lens. The aspheric lens can be easily made into a shape other than a spherical surface, and more control variables can be obtained, which is beneficial to reduce aberrations, and obtain the advantages of good imaging with a smaller number of lenses; thereby reducing the number of lenses to meet the miniaturization.

Wherein, one or more of the first lens group, the second lens group, and the third lens group are provided with an infrared transmission film on the object side or the image side of the lens. The infrared transmission film can pass light in the near-infrared and infrared bands and cut off the light in other bands, ensuring the imaging resolution capability of the optical imaging system in the near-infrared band, and ensuring the thermal imaging quality of the optical imaging system.

Wherein, the optical imaging system further includes an aperture, and the effective diameter of the aperture is the aperture of the object side of the first lens. The diaphragm can make the optical imaging system have a telecentric effect and increase the efficiency of the photosensitive element to receive images.

Wherein, the optical imaging system satisfies the following conditional formula:

0＜f1/f＜1;

Wherein, f1 is the focal length of the first lens of the optical imaging system, and f is the effective focal length of the optical imaging system.

When 0<f1/f<1, the optical imaging system can provide positive optical power and focus the incident light beam, which is beneficial for the optical imaging system to effectively transfer the collected image information to the imaging surface.

0<f23/f<3;

Wherein, f23 is the focal length of the second lens group, and f is the effective focal length of the optical imaging system.

When 0＜f23/f＜3, it is beneficial to correct chromatic aberration, reduce eccentricity sensitivity, correct optical imaging system aberration, improve imaging resolution; reduce optical imaging system assembly sensitivity, solve lens manufacturing and optical imaging system assembly Problem, improve yield.

5＜(CT3－CT2)×100/f23＜30;

Wherein, CT2 is the distance between the object side of the second lens and the image side on the optical axis; CT3 is the distance between the object side of the third lens and the image side on the optical axis; f23 is the focal length of the second lens group.

By reasonably configuring the central thickness of the second lens and the third lens, the second lens group has a positive refractive power as a whole, which can optimize aberrations, make the optical imaging system compact, reduce the total length of the optical imaging system, and benefit the optical imaging system The miniaturization.

1＜RS5/f＜20;

Wherein, RS5 is the radius of curvature of the object side of the third lens, and f is the effective focal length of the optical imaging system.

When 1<RS5/f<20, it is beneficial to optimize the aberration of the optical imaging system and suppress the generation of ghost images.

4＜(RS6－RS7)/(SagS6－SagS7)＜10;

Wherein, RS6 is the radius of curvature of the image side surface of the third lens, RS7 is the radius of curvature of the object side surface of the fourth lens, Sag S6 is the vector height of the image side surface of the third lens, and Sag S7 is the object surface of the fourth lens. The vector height from the side.

When 4＜(RS6－RS7)/(SagS6－SagS7)＜10, it is beneficial for the aberration of the second lens group and the third lens group to be complementary, so as to achieve the effect of correcting aberrations, and also beneficial to control the size of the optical imaging system , Making it more compact.

－2.5＜f45/f＜－0.5;

Wherein, f45 is the focal length of the third lens group, and f is the effective focal length of the optical imaging system.

The third lens group has negative refractive power, which complements the aberrations of the first lens group and the second lens group, reduces sensitivity, and improves the imaging resolution of the optical imaging system.

-15＜(CT5－CT4)×100/f45＜－3;

Wherein, CT4 is the distance between the object side of the fourth lens and the image side on the optical axis, CT5 is the distance between the object side of the fifth lens and the image side on the optical axis, and f45 is the focal length of the third lens group.

By rationally configuring the center thickness of the fourth lens and the fifth lens, the third lens group has negative refractive power as a whole, which can optimize aberrations, make the optical imaging system compact, reduce the overall length of the optical imaging system, and facilitate miniaturization .

4＜(D23+D34)×100/TTL＜18;

Wherein, D23 is the distance between the image side of the second lens and the object side of the third lens with respect to the optical axis, D34 is the distance between the image side of the third lens and the object side of the fourth lens with the optical axis, and TTL is the optical imaging The total length of the system.

When 4<(D23+D34)×100/TTL<18, it is beneficial to make the optical imaging system compact, reduce the total length of the optical imaging system, and facilitate miniaturization.

0.1≤(|RS4|+|RS7|)/(|RS5|+|RS6|)<2;

Wherein, RS4 is the radius of curvature of the image side surface of the second lens, RS5 is the radius of curvature of the object side surface of the third lens, RS6 is the radius of curvature of the image side surface of the third lens, and RS7 is the radius of curvature of the object side surface of the fourth lens. The radius of curvature.

When 0.1≤(|RS4|+|RS7|)/(|RS5|+|RS6|)<2, it is beneficial to optimize the aberration of the optical imaging system, improve the imaging resolution, and suppress the generation of ghost images.

0.5＜Imgh/f＜1;

Wherein, Imgh is the total image height in the angular direction of the imaging surface of the optical imaging system, and f is the effective focal length of the optical imaging system.

When 0.5<Imgh/f<1, the optical imaging system can not only have high pixels and high imaging quality, but also control the total length of the optical imaging system to minimize the volume of the optical imaging system.

3＜TTL/BFL＜7;

Wherein, BFL is the optical back focus of the optical imaging system, and TTL is the total length of the optical imaging system.

By controlling the ratio of the optical back focus of the optical imaging system to the total length of the optical imaging system, the optical imaging system is made more compact.

2.55＜FOV/CRA＜3.55;

Wherein, FOV is the diagonal field angle of the optical imaging system, and CRA is the chief ray incident angle of the optical imaging system.

When 2.55＜FOV/CRA＜3.55, the optical imaging system has a sufficient field of view to meet the high FOV requirements of mobile phones, cameras, vehicles, surveillance, medical and other electronic products, while reducing the angle of light entering the chip. Improve photosensitive performance.

An image capturing device, which includes:

The above-mentioned optical imaging system; and

The photosensitive element is located on the image side of the optical imaging system.

An electronic device, which includes:

The main body of the equipment and;

In the above-mentioned image capturing device, the image capturing device is installed on the main body of the device.

Therefore, the optical imaging system of the present application is composed of three lens groups, which is small in size and has high pixel resolution.

Description of the drawings

In order to more clearly illustrate the structural features and effects of the present application, the following will describe it in detail with reference to the accompanying drawings and specific embodiments.

Figure 1-1 is a schematic diagram of the structure of the optical imaging system according to the first embodiment of the present application.

Figures 1-2 are graphs of spherical aberration, astigmatism, and distortion of the optical imaging system according to the first embodiment of the present application, from left to right.

Figure 2-1 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present application.

Figure 2-2 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system according to the second embodiment of the present application, from left to right.

Figure 3-1 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present application.

Fig. 3-2 shows the spherical aberration, astigmatism and distortion curves of the optical imaging system according to the third embodiment of the present application, from left to right.

Figure 4-1 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present application.

Fig. 4-2 shows the spherical aberration, astigmatism and distortion curves of the optical imaging system according to the fourth embodiment of the present application, from left to right.

Figure 5-1 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present application.

Fig. 5-2 shows the spherical aberration, astigmatism and distortion curves of the optical imaging system according to the fifth embodiment of the present application, from left to right.

Fig. 6-1 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present application.

Fig. 6-2 shows the spherical aberration, astigmatism and distortion curves of the optical imaging system according to the sixth embodiment of the present application, from left to right.

FIG. 7 is a schematic structural diagram of an image capturing device according to an embodiment of the present application.

FIG. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Specific embodiment

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Please refer to Figure 1-1, Figure 2-1, Figure 3-1, Figure 4-1, Figure 5-1, and Figure 6-1, the optical imaging system 100 of the embodiment of the present application is applied to a vehicle-mounted camera device, which From the object side to the image side, the first lens group 10 having positive refractive power, the second lens group 30 having positive refractive power, and the third lens group 50 having negative refractive power are sequentially included.

Optionally, the first lens group 10 includes a first lens L1. The first lens L1 is made of glass and has a positive refractive power. The first lens L1 includes an object side surface S1 and an image side surface S2. The object side surface S1 is a convex surface, and the image side surface S2 is a convex surface or a flat surface. The object side surface of the first lens is a convex surface, which can strengthen the positive refractive power of the first lens, which undertakes the main imaging function of the optical imaging system, and is beneficial to ultra-thinness. The image side of the first lens L1 is set as a plane, so that the optical imaging system is easy to assemble and bear, and the assembly sensitivity of the lens is reduced, which is beneficial to improve the yield rate and reduce the production cost of the lens.

Optionally, the second lens group 30 includes a second lens L2 having a negative refractive power and a third lens L3 having a positive refractive power. The second lens and the third lens provide positive optical power for the entire optical imaging system, which can converge the large-angle light entering the system and optimize the phase difference of the large-angle field of view.

Wherein, the second lens L2 may be made of glass material or plastic material, and has an object side surface S3 and an image side surface S4. The object side surface S3 of the second lens L2 is a concave surface, and the image side surface S4 is a convex surface or a concave surface.

Among them, the third lens L3 is made of glass and has an object side surface S5 and an image side surface S6. Both the object side surface S5 and the image side surface S6 are convex surfaces.

The reasonable configuration of the shapes in the second lens group can increase the imaging field of view, so that the light beam carrying the object information can be effectively taken into the optical imaging system and transmitted to the imaging surface.

Optionally, the third lens group 50 includes a fourth lens L4 having negative refractive power and a fifth lens L5 having refractive power. The reasonable configuration of the shapes in the second lens group can increase the imaging field of view, so that the light beam carrying the object information can be effectively taken into the optical imaging system and transmitted to the imaging surface.

Among them, the fourth lens L4 is made of glass and has an object side surface S7 and an image side surface S8. The object side surface S7 is a concave surface, and the image side surface S8 is a concave or convex surface.

Among them, the fifth lens L5 is made of glass and has an object side surface S9 and an image side surface S10. The fifth lens L5 may have positive refractive power or negative refractive power. The object side surface S9 is a concave surface or a convex surface, and the image side surface S10 is a concave surface, a convex surface or a flat surface.

The reasonable configuration of the shape of the fourth lens L4 and the fifth lens L5 is beneficial to correct the field area of the front lens group, optimize the aberration of the optical imaging system, and improve the imaging resolution.

When the image side surface S10 of the fifth lens L5 is set as a plane, the optical imaging system 100 is easy to assemble and bear, and the assembly sensitivity of the lens is reduced, which is beneficial to improve the yield rate and reduce the production cost of the lens.

The optical imaging system 100 of the present application is small in size and has high pixel resolution, and can be used for high-pixel camera lenses, automatic driving, monitoring devices, etc. based on vehicle-mounted use.

In some embodiments, one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 is an aspheric lens. "Aspherical lens" refers to a lens with at least one aspherical surface. The aspheric lens can be easily manufactured into a shape other than a spherical surface to obtain more control variables, which is beneficial to reduce aberrations, and obtain the advantages of good imaging with a smaller number of lenses; thereby reducing the number of lenses to meet the miniaturization.

In some embodiments, one or more of the object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are provided with an infrared transmission film. The infrared permeable film can pass light in the near-infrared and infrared bands and cut off light in other bands, ensuring the imaging resolution capability of the optical imaging system 100 in the near-infrared band, and ensuring the thermal imaging quality of the optical imaging system.

In some embodiments, the optical imaging system 100 further includes an aperture (not shown), and the effective diameter of the aperture is the aperture of the first lens L1 on the object side S1. The diaphragm can make the optical imaging system have a telecentric effect and increase the efficiency of the photosensitive element to receive images.

In some embodiments, the optical imaging system 100 further includes a protective glass 70. The cover glass 70 has a first surface 71 and a second surface 72. The protective glass 70 is made of glass and is located between the fifth lens L5 and the imaging surface 80. The protective glass 70 is used to protect the photosensitive element of the imaging surface 80 to achieve a dust-proof effect.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

0＜f1/f＜1;

In other words, f1/f can be any value between 0 and 1, for example, the value of f1/f is 0.1, 0.2, 0.3, 0.5, 0.8, 0.9, 0.99, and so on.

0<f23/f<3;

Wherein, f23 is the focal length of the second lens group, that is, the combined focal length of the second lens L2 and the third lens L3, and f is the effective focal length of the optical imaging system.

That is, f23/f can be any value between 0 and 3, such as 0.2, 0.8, 1, 1.2, 1.5, 2, 2.5, 2.9, and so on.

When 0＜f23/f＜3, it is beneficial to correct chromatic aberration, reduce eccentricity sensitivity, correct optical imaging system aberration, and improve imaging resolution; reduce optical imaging system assembly sensitivity, solve lens manufacturing and optical imaging system assembly Problem, improve yield.

5＜(CT3－CT2)×100/f23＜30;

Wherein, CT2 is the distance between the object side of the second lens and the image side on the optical axis; CT3 is the distance between the object side of the third lens and the image side on the optical axis; f23 is the focal length of the second lens group, namely The combined focal length of the second lens L2 and the third lens L3.

In other words, (CT3-CT2)×100/f23 can be any value between 5 and 30, such as 5.1, 6, 10, 15, 20, 25, 28, 29.9 and so on.

By properly configuring the central thickness of the second lens L2 and the third lens L3, the second lens group 30 has a positive refractive power as a whole, which can optimize aberrations, make the optical imaging system compact, and reduce the overall length of the optical imaging system, which is beneficial to Miniaturization of the optical imaging system.

1＜RS5/f＜20;

In other words, RS5/f can be any value between 1 and 20, such as 11, 2, 5, 10, 15, 18, 19.9 and so on.

When 1<RS5/f<20, it is beneficial to optimize the aberration of the optical imaging system and suppress the generation of ghost images. "Ghost image" is also called ghost image, which refers to the additional image generated near the focal plane of the optical system due to the reflection of the lens surface. Its brightness is generally darker and it is offset from the original image.

4＜(RS6－RS7)/(SagS6－SagS7)＜10;

Wherein, RS6 is the radius of curvature of the image side surface of the third lens, RS7 is the radius of curvature of the object side surface of the fourth lens, SagS6 is the vector height of the image side surface of the third lens, and SagS7 is the image side surface of the fourth lens. Yataka.

The sagittal height (also called sag) refers to the vertical distance from the geometric center of the rear surface of the lens to the plane of the lens diameter.

In other words, (RS6-RS7)/(SagS6-SagS7) can be any value between 4 and 10, such as 4.1, 5, 6, 7, 8, 9, 9.9 and so on.

－2.5＜f45/f＜－0.5;

In other words, f45/f can be any value between -2.5 and -0.5, such as -2.49, -2.2, -2, -1.5, -1.2, -1.0, -0.8, -0.51, etc.

The third lens group 50 has a negative refractive power, which complements the aberrations of the first lens group 10 and the second lens group 30, reduces sensitivity, and improves the imaging resolution of the optical imaging system.

-15＜(CT5－CT4)×100/f45＜－3;

Wherein, CT4 is the distance between the object side of the fourth lens and the image side on the optical axis, CT5 is the distance between the object side of the fifth lens and the image side on the optical axis, and f45 is the focal length of the second lens group, namely The combined focal length of the fourth lens L4 and the fifth lens L5.

In other words, CT5-CT4)×100/f45 can be any value between -15 and -3, such as -14.9, -14, -10, -8, -5, -3.1, etc.

By rationally configuring the central thickness of the fourth lens L4 and the fifth lens L5, the third lens group 50 has a negative refractive power as a whole, which can optimize aberrations, make the optical imaging system compact, and reduce the total length of the optical imaging system. Conducive to miniaturization.

4＜(D23+D34)×100/TTL＜18;

In other words, (D23+D34)×100/TTL can be any value between 4 and 18, such as 4.1, 6, 8, 10, 12, 15, 16, 17.9 and so on.

0.1≤(|RS4|+|RS7|)/(|RS5|+|RS6|)<2;

That is, (|RS4|+|RS7|)/(|RS5|+|RS6|) can be any value between 0.1 and 2, such as 0.15, 0.7, 1.0, 1.2, 1.5, 1.9, 1.99, and so on.

0.5＜Imgh/f＜1;

That is, Imgh/f can be any value between 0.5 and 4, such as 0.51, 0.6, 0.7, 0.8, 0.9, 0.99, and so on.

3＜TTL/BFL＜7;

In other words, TTL/BFL can be any value between 3 and 7, such as 3.1, 3.5, 4, 5, 6, 6.5, 6.9, etc.

2.55＜FOV/CRA＜3.55;

That is, FOV/CRA can be any value between 2.55 and 3.55, such as 2.56, 2.8, 3.0, 3.2, 3.4, 3.54, etc.

The optical imaging system 100 of the present application will be described in further detail below in conjunction with specific embodiments.

The first embodiment

Please refer to Figs. 1-1 and 1-2, in which Fig. 1-1 is a schematic structural diagram of the optical imaging system 100 of the first embodiment, and Fig. 1-2 shows the spherical aberration and the spherical aberration of the first embodiment of the present application in order from left to right. Graph of astigmatism and distortion. It can be seen from Figures 1-1 that the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S10 of the fifth lens L5.

The first lens L1 is made of glass and has an object side surface S1 and an image side surface S2. Both the object side surface S1 and the image side surface S2 of the first lens L1 are spherical surfaces. The object side surface S1 is a convex surface, and the image side surface S2 is a flat surface.

The second lens L2 is made of glass and has an object side surface S3 and an image side surface S4. Both the object side surface S3 and the image side surface S4 are spherical surfaces. The object side surface S3 is a concave surface, and the image side surface S4 is a concave surface.

The third lens L3 is made of glass and has an object side surface S5 and an image side surface S6. Both the object side surface S5 and the image side surface S6 are aspherical surfaces. Both the object side surface S5 and the image side surface S6 are convex surfaces.

The fourth lens L4 is made of glass and has an object side surface S7 and an image side surface S8. Both the object side surface S7 and the image side surface S8 are spherical surfaces. The object side surface S7 is a concave surface, and the image side surface S8 is a concave surface.

Among them, the fifth lens L5 is made of glass and has an object side surface S9 and an image side surface S10. Both the object side surface S9 and the image side surface S10 are spherical surfaces. The object side surface S9 is a convex surface, and the image side surface S10 is a flat surface.

The optical imaging system 100 further includes a diaphragm formed by the aperture size of the first lens L1 on the object side surface S1.

In this embodiment, f1=5.65, f=7.72, f1/f=0.73; f23=12.32, f23/f=1.60; CT2=0.6, CT3=1.68, (CT3-CT2)×100/f23=8.73; RS5=22.81, RS5/f=2.95; RS6=-4.02, RS7=-3.64, SagS6=-0.65, SagS7=-0.73, (RS6-RS7)/(SagS6-SagS7)=5.28; f45=-15.43, f45 /f=-2.00; CT4=0.70, CT5=1.44, (CT5-CT4)×100/f45=-4.77; D23=0.54, D34=0.77, TTL=11.0, (D23+D34)×100/TTL=11.93 ; |RS4|=5.66, |RS5|=22.81, |RS6|=4.02, |RS7|=3.64, (|RS4|+|RS7|)/(|RS5|+|RS6|)=0.35; Imgh=6.18 , Imgh/f=0.80; BFL=2.40, TTL/BFL=4.58; FOV=42.7, CRA=15.7, FOV/CRA=2.72.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 1 and Table 2 below.

In Table 1, FNO is the aperture number of the optical imaging system.

Table 2 is the aspheric surface data of the first embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4-20th order aspheric surface coefficients of each surface.

It can be seen from FIGS. 1-2 that the optical imaging system 100 of the present application has a higher pixel resolution under the condition of meeting miniaturization.

Second embodiment

Please refer to Figures 2-1 and Figures 2-2, in which Figure 2-1 is a schematic structural diagram of the optical imaging system 100 according to the second embodiment, and Figure 2-2 shows the spherical aberration and the spherical aberration of the second embodiment of the present application in order from left to right. Graph of astigmatism and distortion. It can be seen from Figures 2-1 that the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S8 of the fourth lens L4.

The first lens L1 is made of glass and has an object side surface S1 and an image side surface S2. Both the object side surface S1 and the image side surface S2 of the first lens L1 are spherical surfaces. The object side surface S1 is a convex surface, and the image side surface S2 is a convex surface.

The second lens L2 is made of plastic material and has an object side surface S3 and an image side surface S4. Both the object side surface S3 and the image side surface S4 are aspherical surfaces. The object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.

The third lens L3 is made of glass and has an object side surface S5 and an image side surface S6. Both the object side surface S5 and the image side surface S6 are spherical surfaces. Both the object side surface S5 and the image side surface S6 are convex surfaces.

Among them, the fifth lens L5 is made of glass and has an object side surface S9 and an image side surface S10. Both the object side surface S9 and the image side surface S10 are spherical surfaces. The object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.

In this embodiment, f1=4.88, f=7.8, f1/f=0.63; f23=5.51, f23/f=0.71; CT2=1.19, CT3=2.04, (CT3-CT2)×100/f23=15.39; RS5 = 29.99, RS5/f = 3.84; RS6 = -3.49, RS7 = -3.10, SagS6 = -0.73, SagS7 = -0.82, (RS6-RS7)/(SagS6 -SagS7) = 4.69; f45 = -8.43, f45 /f = -1.08; CT4 = 0.80, CT5 = 1.65, (CT5-CT4) × 100/f45 =-10.14; D23 = 0.28, D34 = 0.23, TTL = 11.0, (D23 + D34) × 100/TTL = 4.68 ; |RS4|=55.75, |RS5|=29.99, |RS6|=3.49, |RS7|=3.09, (|RS4|+|RS7|)/(|RS5|+|RS6|)=1.76; Imgh=6.18 , Imgh/f=0.79; BFL=2.01, TTL/BFL=5.48; FOV=42.1, CRA=15.6, FOV/CRA=2.70.

In this embodiment, the optical imaging system 100 satisfies the conditions in Table 3 and Table 4 below.

In Table 3, FNO is the aperture number of the optical imaging system.

Table 4 is the aspheric surface data of the second embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4-20th order aspheric surface coefficients of each surface.

It can be seen from Figs. 2-2 that the optical imaging system 100 of the present application has relatively high pixels when miniaturization is satisfied.

The third embodiment

Please refer to FIGS. 3-1 and 3-2, where FIG. 3-1 is a schematic structural diagram of the optical imaging system 100 of the third embodiment, and FIG. 3-2 is the spherical aberration, Graph of astigmatism and distortion. It can be seen from Figure 3-1 that the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S2 of the first lens L1.

In this embodiment, f1=4.23, f=7.66, f1/f=0.55; f23=8.67, f23/f=1.13; CT2=0.55, CT3=1.56, (CT3-CT2)×100/f23=11.59; RS5=95, RS5/f=12.4; RS6=-3.00, RS7=-5.10, SagS6=-0.62, SagS7=-0.38, (RS6-RS7)/(SagS6-SagS7)=8.53; f45=-13.3, f45 /f＝－1.74; CT4＝0.55, CT5＝1.55, (CT5－CT4)×100/f

45= -7.49; D23=0.44, D34=0.10, TTL=10.88, (D23+D34)×100/TTL=5.00; |RS4|=4.54, |RS5|=95, |RS6|=3, |RS7| = 5.10, (|RS4|+|RS7|)/(|RS5|+|RS6|) = 0.1; Imgh = 6.18, Imgh/f = 0.81; BFL = 3.28, TTL/BFL =

3.31; FOV=43.4, CRA=12.5, FOV/CRA=3.47.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 5 and Table 6 below.

In Table 5, FNO is the aperture number of the optical imaging system.

Table 6 is the aspheric surface data of the third embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4-20th order aspheric surface coefficients of each surface.

It can be seen from Figs. 3-2 that the optical imaging system 100 of the present application has relatively high pixels under the condition of meeting miniaturization.

Fourth embodiment

Please refer to Figures 4-1 and Figures 4-2, in which Figure 4-1 is a schematic structural diagram of the optical imaging system 100 of the fourth embodiment, and Figure 4-2 shows the spherical aberration and the spherical aberration of the fourth embodiment of the present application in order from left to right. Graph of astigmatism and distortion. It can be seen from Figures 4-1 that the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S2 of the first lens L1.

In this embodiment, f1=4.97, f=7.86, f1/f=0.63; f23=7.63, f23/f=0.97; CT2=0.50, CT3=1.81, (CT3-CT2)×100/f23=17.21; RS5 = 11.36, RS5/f = 1.45; RS6 = -4.00, RS7 = -4.77, SagS6 = -0.77, SagS7 = -0.64, (RS6-RS7)/(SagS6 -SagS7) = 6.16; f45 =-16.11, f45 /f=-2.05; CT4=0.50, CT5=1.44, (CT5-CT4)×100/f45=-5.87; D23=1.14, D34=0.49, TTL=11.08, (D23+D34)×100/TTL=14.69 ; |RS4|=3.48, |RS5|=11.36, |RS6|=4.00, |RS7|=4.76, (|RS4|+|RS7|)/(|RS5|+|RS6|)=0.54; Imgh=6.18 , Imgh/f=0.79; BFL=2.41, TTL/BFL=4.59; FOV=42.7, CRA=15.0, FOV/CRA=2.85.

In this embodiment, the optical imaging system 100 satisfies the conditions in Table 7 and Table 8 below.

In Table 7, FNO is the aperture number of the optical imaging system.

Table 8 is the aspheric surface data of the fourth embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4-20th order aspheric surface coefficients of each surface.

It can be seen from FIGS. 4-2 that the optical imaging system 100 of the present application has relatively high pixels under the condition of meeting miniaturization.

Fifth embodiment

Please refer to Figures 5-1 and Figures 5-2, in which Figure 5-1 is a schematic structural diagram of the optical imaging system 100 of the fifth embodiment, and Figure 5-2 shows the spherical aberration, Graph of astigmatism and distortion. It can be seen from Figures 5-1 that the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S2 of the first lens L1.

Among them, the fifth lens L5 is made of glass and has an object side surface S9 and an image side surface S10. Both the object side surface S9 and the image side surface S10 are spherical surfaces. The object side surface S9 is a convex surface, and the image side surface S10 is a concave surface.

In this embodiment, f1=7.30, f=7.77, f1/f=0.68; f23=16.80, f23/f=2.16; CT2=0.50, CT3=1.86, (CT3-CT2)×100/f23=8.07; RS5=37.53, RS5/f=4.83; RS6=-5.40, RS7=-3.64, SagS6=-0.51, SagS7=-0.78, (RS6-RS7)/(SagS6-SagS7)=6.43; f45=-14.85, f45 /f = -1.91; CT4 = 0.70, CT5 = 1.46, (CT5-CT4) × 100/f45 =-5.14; D23 = 1.01, D34 = 0.92, TTL = 11.0, (D23 + D34) × 100/TTL = 17.54 ; |RS4|=4.32, |RS5|=37.53, |RS6|=5.40, |RS7|=3.64, (|RS4|+|RS7|)/(|RS5|+|RS6|)=0.19; Imgh=6.18 , Imgh/f=0.80; BFL=2.01, TTL/BFL=5.49; FOV=42.5, CRA=15.6, FOV/CRA=2.72.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 9 below.

In Table 9, FNO is the aperture number of the optical imaging system.

It can be seen from FIGS. 5-2 that the optical imaging system 100 of the present application has relatively high pixels when miniaturization is satisfied.

Sixth embodiment

Please refer to FIGS. 6-1 and 6-2, where FIG. 6-1 is a schematic structural diagram of the optical imaging system 100 of the sixth embodiment, and FIG. 6-2 shows the spherical aberration, Graph of astigmatism and distortion. 6-1, the optical imaging system 100 of this embodiment includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and a second lens with positive refractive power from the object side to the image side. The three lenses L3, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, the protective glass 70 and the imaging surface 80. The first lens L1 constitutes the first lens group 10. The second lens L2 and the third lens L3 constitute a second lens group 30. The fourth lens L4 and the fifth lens L5 constitute a third lens group 50. The optical imaging system 100 further includes an infrared transmission film (not shown), and the infrared transmission film is plated on the image side surface S2 of the first lens L1.

Among them, the fifth lens L5 is made of glass and has an object side surface S9 and an image side surface S10. Both the object side surface S9 and the image side surface S10 are aspherical surfaces. The object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.

In this embodiment, f1=5.87, f=7.77, f1/f=0.76; f23=6.21, f23/f=0.8; CT2=0.60, CT3=2.07, (CT3-CT2)×100/f23=23.75; RS5=8.59, RS5/f=1.11; RS6=-4.78, RS7=-3.95, SagS6=-0.62, SagS7=-0.74, (RS6-RS7)/(SagS6-SagS7)=7.19; f45=-6.76, f45 /f=-0.87; CT4=0.70, CT5=1.21, (CT5-CT4)×100/f45=-7.54; D23=0.91, D34=0.32, TTL=11.00, (D23+D34)×100/TTL=11.12 ; |RS4|=4.03, |RS5|=8.59, |RS6|=4.78, |RS7|=3.95, (|RS4|+|RS7|)/(|RS5|+|RS6|)=0.60; Imgh=6.18 , Imgh/f=0.80; BFL=2.00, TTL/BFL=5.50; FOV=43.3, CRA=15.0, FOV/CRA=2.89.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 10 and Table 11 below.

In Table 10, FNO is the aperture number of the optical imaging system.

Table 11 is the aspheric surface data of the sixth embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4-20th order aspheric surface coefficients of each surface.

It can be seen from FIG. 6-2 that the optical imaging system 100 of the present application has relatively high pixels under the condition of meeting miniaturization.

As shown in FIG. 7, the present application also provides an image capturing device 200 including the optical imaging system 100 and the photosensitive element 210 of the present application. The photosensitive element 210 is located on the image side of the optical imaging system 100.

The photosensitive element 210 of the present application may be a photosensitive coupling device (Charge Coupled Device, CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor).

For the description of other features of the image capturing device 200, please refer to the above description, which will not be repeated here.

As shown in FIG. 8, the present application also provides an electronic device 300, which includes a device main body 310 and the image capturing device 200 of the present application. The orientation device 200 is installed on the device main body 310.

The electronic device 300 of this application includes, but is not limited to, computers, laptops, tablet computers, mobile phones, cameras, smart bracelets, smart watches, smart glasses, and the like.

The above are only specific implementations of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

An optical imaging system, characterized in that, from the object side to the image side sequentially includes:

A first lens group with positive refractive power;

A second lens group with positive refractive power; and

A third lens group with negative refractive power;

Wherein, the first lens group includes a first lens, the object side surface of the first lens is convex, and the image side surface is convex or flat;

The second lens group includes two lenses; the third lens group includes two lenses.
The optical imaging system according to claim 1, wherein the second lens group includes a second lens with negative refractive power and a third lens with positive refractive power.
The optical imaging system of claim 2, wherein the object side surface of the second lens is concave, and the image side surface is convex or concave; the object side and the image side surface of the third lens are both convex.
The optical imaging system according to claim 1 or 2, wherein the third lens group includes a fourth lens with negative refractive power and a fifth lens with refractive power.
The optical imaging system of claim 4, wherein the object side surface of the fourth lens is concave, and the image side surface is concave or convex; the object side surface of the fifth lens is concave or convex, and the image side surface is concave , Convex or flat surface.
The optical imaging system according to claim 1, wherein one of the first lens group, the second lens group and the third lens group is an aspheric lens.
The optical imaging system according to claim 1, wherein one or more of the first lens group, the second lens group, and the third lens group are provided with an infrared transmission film on the object side or the image side of the lens .
The optical imaging system according to claim 1, wherein the optical imaging system further comprises an aperture, and the effective diameter of the aperture is the aperture on the object side of the first lens.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

0＜f1/f＜1;

Wherein, f1 is the focal length of the first lens of the optical imaging system, and f is the effective focal length of the optical imaging system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

0<f23/f<3;

Wherein, f23 is the focal length of the second lens group, and f is the effective focal length of the optical imaging system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

5＜(CT3－CT2)×100/f23＜30;

Wherein, CT2 is the distance between the object side of the second lens and the image side on the optical axis; CT3 is the distance between the object side of the third lens and the image side on the optical axis; f23 is the focal length of the second lens group.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

1＜RS5/f＜20;

Wherein, RS5 is the radius of curvature of the object side of the third lens, and f is the effective focal length of the optical imaging system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

4＜(RS6－RS7)/(SagS6－SagS7)＜10;

Wherein, RS6 is the radius of curvature of the image side surface of the third lens, RS7 is the radius of curvature of the object side surface of the fourth lens, SagS6 is the vector height of the image side surface of the third lens, and SagS7 is the image side surface of the fourth lens. Yataka.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

－2.5＜f45/f＜－0.5;

Wherein, f45 is the focal length of the third lens group, and f is the effective focal length of the optical imaging system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

-15＜(CT5－CT4)×100/f45＜－3;

Wherein, CT4 is the distance between the object side of the fourth lens and the image side on the optical axis, CT5 is the distance between the object side of the fifth lens and the image side on the optical axis, and f45 is the focal length of the third lens group.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

4＜(D23+D34)×100/TTL＜18;

Wherein, D23 is the distance between the image side of the second lens and the object side of the third lens with respect to the optical axis, D34 is the distance between the image side of the third lens and the object side of the fourth lens with the optical axis, and TTL is the optical imaging The total length of the system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

0.1≤(|RS4|+|RS7|)/(|RS5|+|RS6|)<2;

Wherein, RS4 is the radius of curvature of the image side surface of the second lens, RS5 is the radius of curvature of the object side surface of the third lens, RS6 is the radius of curvature of the image side surface of the third lens, and RS7 is the radius of curvature of the object side surface of the fourth lens. The radius of curvature.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

0.5＜Imgh/f＜1;

Wherein, Imgh is the total image height in the angular direction of the imaging surface of the optical imaging system, and f is the effective focal length of the optical imaging system.
The optical imaging system according to claim 4, wherein the optical imaging system satisfies the following conditional formula:

3＜TTL/BFL＜7;

Wherein, BFL is the optical back focus of the optical imaging system, and TTL is the total length of the optical imaging system.
The optical imaging system according to any one of claims 1-3 and 5-19, wherein the optical imaging system satisfies the following conditional formula:

2.55＜FOV/CRA＜3.55;

Wherein, FOV is the diagonal field angle of the optical imaging system, and CRA is the chief ray incident angle of the optical imaging system.
An image capturing device, characterized in that it comprises:

The optical imaging system of any one of claims 1-20; and

The photosensitive element is located on the image side of the optical imaging system.
An electronic device, characterized in that it comprises:

The main body of the equipment and;

The imaging device of claim 21, wherein the imaging device is mounted on the main body of the device.