CN115793190B

CN115793190B - Optical imaging system, camera module and electronic equipment

Info

Publication number: CN115793190B
Application number: CN202211353544.7A
Authority: CN
Inventors: 李阳; 王新权
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-10-20
Anticipated expiration: 2042-11-01
Also published as: CN115793190A

Abstract

The embodiment of the application provides an optical imaging system, a camera module and electronic equipment. The optical imaging system includes a first lens group and a second lens group. The first lens group comprises a prism and a first lens. The prism is located on the incident side and has optical power. The prism includes an entrance surface, a reflection surface, and an exit surface. The reflecting surface is used for reflecting the light rays incident on the incident surface to the emergent surface. The incident surface is convex. The prism enables light rays passing through the incidence surface along the optical axis to be reflected by the reflection surface and then to exit from the exit surface along the optical axis. The first lens is positioned on the image side of the prism. The object side of the first lens is glued to the exit surface of the prism. The first lens has optical power. The image side surface of the first lens is a concave surface. The first lens group and the second lens group are disposed in order along the optical axis from the object side to the image side. The second lens group includes a refractive lens having optical power. Light rays exiting from the image side surface of the first lens along the optical axis are incident on the second lens group and pass through the refractive lens.

Description

Optical imaging system, camera module and electronic equipment

Technical Field

The embodiment of the application relates to the technical field of terminals, in particular to an optical imaging system, a camera module and electronic equipment.

Background

With the explosive growth of electronic devices such as smart phones or tablet computers, the functions of the electronic devices are increasing. As electronic devices are expected to meet more functional demands, more and more functions are available to the electronic devices themselves. For example, the electronic device includes a camera module. It is desirable that the electronic device can photograph a distant object and has good image quality. Because the electronic equipment has the trend of miniaturization and thinness, the thickness of the electronic equipment is continuously reduced, so that the size of the camera module in the thickness direction of the electronic equipment is limited, the focal length of the camera module is relatively smaller, and the camera module is not easy to shoot distant objects. With the development of technology, periscope type camera modules are applied to electronic equipment. The periscope type camera module can occupy smaller space in the thickness direction of the electronic equipment, thereby being beneficial to miniaturization and lightening of the electronic equipment. The periscope type camera module can have good long-focus characteristic, and can realize shooting of distant objects. However, the periscope type camera module has the problem of relatively small light entering quantity, and influences imaging quality.

Disclosure of Invention

The embodiment of the application provides an optical imaging system, a camera module and electronic equipment, which can be beneficial to increasing the light inlet quantity of the camera module and improving the imaging quality of the camera module.

The first aspect of the present application provides an optical imaging system, which at least comprises a first lens group and a second lens group.

The first lens group comprises a prism and a first lens. The prism is located on the incident side and has optical power. The prism includes an entrance surface, a reflection surface, and an exit surface. The reflecting surface is used for reflecting the light rays incident on the incident surface to the emergent surface. The incident surface is convex. The prism enables light rays passing through the incidence surface along the optical axis to be reflected by the reflection surface and then to exit from the exit surface along the optical axis.

The first lens is positioned on the image side of the prism. The object side of the first lens is glued to the exit surface of the prism. The first lens has optical power.

The image side surface of the first lens is a concave surface. The first lens group and the second lens group are disposed in order along the optical axis from the object side to the image side. The second lens group includes a refractive lens having optical power. Light rays exiting from the image side surface of the first lens along the optical axis are incident on the second lens group and pass through the refractive lens.

The optical imaging system of the embodiment of the application comprises a first lens group and a second lens group. The first lens group comprises a prism and a first lens. The first lens is positioned on the image side of the prism. The prism is connected with the first lens in a gluing way. The prism and the first lens have optical power, so that the prism and the first lens have refractive power for deflecting light rays. Because the incident surface of the prism is convex, light rays with an included angle of 0 DEG with the optical axis and light rays with an included angle of more than 0 DEG with the optical axis can enter the prism through the incident surface, so that more light rays can enter the optical imaging system, the light inlet amount of the optical imaging system can be effectively increased, and the field of view range of the optical imaging system is enlarged. Therefore, the optical imaging system of the embodiment of the application is beneficial to improving the imaging definition of the optical imaging system and meeting the requirements of long-range shooting of users. Meanwhile, the light incoming quantity is increased in a mode that the incident surface of the prism is convex, so that the size of the prism can be effectively controlled, the optical imaging system is compact in structure, and the size and the overall weight of the camera module can be effectively controlled.

In one possible embodiment, the second lens group includes five refractive lenses. The five refractive lenses are respectively a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along the direction from the object side to the image side of the optical axis. An air gap is provided between the second lens and the first lens. The second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arbitrarily adjacent to each other with an air gap therebetween.

In one possible embodiment, the effective focal length of the first lens group is f1, and the effective focal length of the optical imaging system is f, which satisfies the following conditions: -3.1< f1/f <2.

In one possible implementation manner, a distance between an object side surface of the first lens group and an imaging surface of the optical imaging system on an optical axis is TTL, and an effective focal length of the optical imaging system is f, which satisfies the following conditions: TTL/f <1.8.

In one possible embodiment, in the first lens group, the radius of curvature of the incident surface of the first lens group is R1, and the radius of curvature of the exit surface of the first lens group is R2, the following condition is satisfied: -0.6 < R1+ R2)/(R1-R2) < 0.5.

In one possible embodiment, the first lens group has a center thickness of CT1 on the optical axis, and the effective focal length of the optical imaging system is f, which satisfies the following condition: 0< CT1/f <0.7.

In one possible embodiment, the effective focal length of the optical imaging system is f and the entrance pupil diameter of the optical imaging system is EPD, satisfying the following condition: f/EPD is less than or equal to 2.1.

In one possible embodiment, the effective focal length of the optical imaging system is f, and the combined focal length of the third lens, the fourth lens, and the fifth lens is f3—5, which satisfies the following condition: -7< f3_5/f <1.1.

In one possible embodiment, the effective focal length of the optical imaging system is f, and the focal length of the sixth lens is f6, which satisfies the following condition: -1.3< f6/f <1.7.

In one possible embodiment, the first lens group and the second lens group are spaced apart by AT12 on the optical axis, and the fifth lens and the sixth lens group are spaced apart by AT56 on the optical axis, satisfying the following conditions: 0< AT12/AT56<22.

In one possible embodiment, the second lens has a center thickness on the optical axis of CT2, the third lens has a center thickness on the optical axis of CT3, and the sixth lens has a center thickness on the optical axis of CT6, which satisfies the following condition: 1.5< (CT2+CT3)/CT 6<3.7.

In one possible embodiment, the object side surface and the image side surface of each of the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are aspheric.

In one possible embodiment, the material of the prism in the first lens group is different from the material of the first lens.

The second aspect of the application provides an image capturing module, which comprises an optical imaging system and an image sensor.

The image sensor is arranged on the image side of the optical imaging system. The optical imaging system at least comprises a first lens group and a second lens group. The first lens group comprises a prism and a first lens. The prism is located on the incident side and has optical power. The prism includes an entrance surface, a reflection surface, and an exit surface. The reflecting surface is used for reflecting the light rays incident on the incident surface to the emergent surface. The incident surface is convex. The prism enables light rays passing through the incidence surface along the optical axis to be reflected by the reflection surface and then to exit from the exit surface along the optical axis. The first lens is positioned on the image side of the prism. The object side of the first lens is glued to the exit surface of the prism. The first lens has optical power. The image side surface of the first lens is a concave surface. The first lens group and the second lens group are disposed in order along the optical axis from the object side to the image side. The second lens group includes a refractive lens having optical power. Light rays exiting from the image side surface of the first lens along the optical axis are incident on the second lens group and pass through the refractive lens.

In one possible embodiment, the camera module further includes a filter. The optical filter is arranged between the second lens group and the image sensor.

The third aspect of the application provides an electronic device, which comprises a shell and an image pickup module. The camera module is arranged in the shell. The camera module comprises an optical imaging system and an image sensor. The image sensor is arranged on the image side of the optical imaging system. The optical imaging system at least comprises a first lens group and a second lens group. The first lens group comprises a prism and a first lens. The prism is located on the incident side and has optical power. The prism includes an entrance surface, a reflection surface, and an exit surface. The reflecting surface is used for reflecting the light rays incident on the incident surface to the emergent surface. The incident surface is convex. The prism enables light rays passing through the incidence surface along the optical axis to be reflected by the reflection surface and then to exit from the exit surface along the optical axis. The first lens is positioned on the image side of the prism. The object side of the first lens is glued to the exit surface of the prism. The first lens has optical power. The image side surface of the first lens is a concave surface. The first lens group and the second lens group are disposed in order along the optical axis from the object side to the image side. The second lens group includes a refractive lens having optical power. Light rays exiting from the image side surface of the first lens along the optical axis are incident on the second lens group and pass through the refractive lens.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a partially exploded structure of an electronic device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a partial cross-sectional structure of an electronic device according to an embodiment of the present application;

fig. 4 is a schematic diagram of a back structure of an electronic device according to an embodiment of the application;

FIG. 5 is a schematic diagram of a partial cross-sectional structure of an image capturing module according to an embodiment of the present application;

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

FIG. 7 is a schematic diagram of a partial structure of an image capturing module according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating longitudinal spherical aberration of an optical imaging system according to an embodiment of the present application;

FIG. 9 is an astigmatic diagram of an optical imaging system according to an embodiment of the present application;

FIG. 10 is a schematic diagram of distortion of an optical imaging system according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a partial structure of an image capturing module according to another embodiment of the present application;

FIG. 12 is a schematic view of longitudinal spherical aberration of an optical imaging system provided by the embodiment of FIG. 11;

FIG. 13 is an astigmatic diagram of an optical imaging system provided by the embodiment of FIG. 11;

FIG. 14 is a schematic diagram of the distortion of the optical imaging system provided by the embodiment of FIG. 11;

fig. 15 is a schematic partial structure of an image capturing module according to another embodiment of the present application;

FIG. 16 is a schematic view of longitudinal spherical aberration of an optical imaging system provided by the embodiment of FIG. 15;

FIG. 17 is an astigmatic diagram of an optical imaging system provided by the embodiment of FIG. 15;

FIG. 18 is a schematic diagram of the distortion of the optical imaging system provided by the embodiment of FIG. 15;

fig. 19 is a schematic partial structure of an image capturing module according to another embodiment of the present application;

FIG. 20 is a schematic view of longitudinal spherical aberration of an optical imaging system provided by the embodiment of FIG. 19;

FIG. 21 is an astigmatic diagram of an optical imaging system provided by the embodiment of FIG. 19;

FIG. 22 is a schematic diagram of the distortion of the optical imaging system provided by the embodiment of FIG. 19;

fig. 23 is a schematic partial structure of an image capturing module according to still another embodiment of the present application;

FIG. 24 is a schematic view of longitudinal spherical aberration of an optical imaging system provided by the embodiment of FIG. 23;

FIG. 25 is an astigmatic diagram of an optical imaging system provided by the embodiment of FIG. 23;

FIG. 26 is a schematic diagram of the distortion of the optical imaging system provided by the embodiment of FIG. 23;

Fig. 27 is a schematic partial structure of an image capturing module according to still another embodiment of the present application;

FIG. 28 is a schematic view of longitudinal spherical aberration of an optical imaging system provided by the embodiment of FIG. 27;

FIG. 29 is an astigmatic diagram of an optical imaging system provided by the embodiment of FIG. 27;

fig. 30 is a schematic diagram of distortion of an optical imaging system provided by the embodiment of fig. 27.

Reference numerals:

10. an electronic device;

20. a display assembly;

30. a housing; 31. a middle frame; 32. a rear cover;

40. a main board;

50. an electronic device;

60. a camera module;

61. a prism; 611. an incident surface; 612. a reflective surface; 613. an exit surface;

70. an optical imaging system;

71. a first lens group;

72. a second lens group;

80. an image sensor;

90. a light filter;

100. a lens barrel;

z, thickness direction;

o, optical axis.

Detailed Description

The electronic device in the embodiment of the present application may be referred to as a User Equipment (UE) or a terminal (terminal), and the electronic device may be, for example, a tablet (portable android device, PAD), a personal digital assistant (personal digital assistant, PDA), a handheld device with a wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in remote medical (remote media), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or a mobile terminal or a fixed terminal. The form of the terminal device in the embodiment of the application is not particularly limited.

In an embodiment of the present application, fig. 1 schematically shows the structure of an electronic device 10 of an embodiment. Referring to fig. 1, an electronic device 10 is illustrated as a handheld device having wireless communication capabilities. The handheld device of the wireless communication function may be a mobile phone, for example.

Fig. 2 schematically shows a partially exploded structure of the electronic device 10. Fig. 3 schematically shows a partially cut-away structure of the electronic device 10. Referring to fig. 2 and 3, the electronic device 10 of an embodiment of the present application may include a display assembly 20 and a housing 30. The display assembly 20 is connected to the housing 30. The exposed display area on display assembly 20 may be used to present image information to a user.

In some implementations, the housing 30 may include a center 31 and a rear cover 32. The display assembly 20 and the rear cover 32 are respectively disposed on two sides of the middle frame 31.

The electronic device 10 may include a motherboard 40 and electronics 50. The motherboard 40 may be a printed circuit board (Printed Circuit Board, PCB). The electronic device 50 is disposed on the motherboard 40. The electronic device 50 is soldered to the motherboard 40 by a soldering process. The electronic device 50 may include, but is not limited to, a central processing unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), a smart algorithm chip, or a Power Management chip (PMIC).

Fig. 4 schematically shows a back structure of the electronic device 10. Referring to fig. 2-4, the electronic device 10 may include a camera module 60. The camera module 60 may include a flexible circuit board (Flexible Printed Circuit, FPC). The camera module 60 may be electrically connected to the main board 40 through a flexible circuit board to implement signal interaction. The camera module 60 is disposed in the housing 30. The housing 30 has light holes. Along the axial of light trap, the light inlet of the module of making a video recording corresponds the light trap setting. Illustratively, the cross-sectional shape of the light-transmitting holes may be circular, elliptical or polygonal, which the present application is not limited to.

The image capturing module 60 may be a periscope type tele lens. The camera module 60 includes a prism that turns light. The incident side in the camera module 60 may be provided with a prism. The prism includes an entrance surface, a reflection surface, and an exit surface. Light rays of the object side to be photographed may enter the prism from an incident surface of the prism along the optical axis. Light entering the prism may be totally reflected at the reflective surface. The reflecting surface is used for reflecting the light rays incident on the incident surface to the emergent surface. Light can exit from the exit surface along the optical axis, thereby realizing light turning. For example, the light may be incident into the camera module 60 along the thickness direction Z of the electronic device 10, and after passing through the prism turn, the light may propagate along the width direction of the electronic device 10. Therefore, the camera module 60 can occupy a small space in the thickness direction Z of the electronic apparatus 10.

In the related art, due to the size limitation of the prism, the light entering amount of the prism is relatively small and the field of view is relatively small, so the image capturing module 60 including the prism is difficult to well meet the requirements of long-range shooting. If the aperture is increased, the aperture of the prism needs to be increased, and the amount of light entering can be increased, but the weight of the image pickup module 60 is increased, which is disadvantageous in the miniaturization design of the image pickup module 60.

The camera module 60 of the application can be beneficial to increasing the light entering quantity of the camera module 60 and enlarging the field of view range, thereby being beneficial to improving the imaging definition of the camera module 60 and meeting the requirement of long-range shooting of users. Meanwhile, the camera module 60 is compact in structure, and effective control of the overall weight of the camera module 60 can be achieved.

The following describes an implementation manner of the camera module 60 provided in the embodiment of the present application.

In the present application, the drawing schematically shows the spherical or aspherical shape of the lens. It will be appreciated that the shape of the sphere or asphere is not limited to that shown in the figures. The figures are for illustration purposes and are not drawn to scale. The surface of each lens near the object side is referred to as the object side of the lens, and the surface of each lens near the image side is referred to as the image side of the lens.

Fig. 5 schematically shows a partially cut-away structure of an image pickup module 60 of an embodiment. Referring to fig. 5, an imaging module 60 according to an embodiment of the present application includes an optical imaging system 70 and an image sensor 80.

When the image capturing module 60 is used for capturing images, light on the object side can be incident on the photosensitive surface of the image sensor 80 after passing through the optical imaging system 70. The photosensitive surface of the image sensor 80 refers to a surface that receives light. The image sensor 80 may be a sensor that converts an optical signal incident on a photosensitive surface into an electrical signal. For example, the image sensor 80 may be a Complementary Metal Oxide Semiconductor (CMOS) sensor or a Charge-coupled Device (CCD).

The optical imaging system 70 of the present application has a virtual imaging surface S18. The imaging surface S18 of the optical imaging system 70 may coincide with the photosensitive surface of the image sensor 80.

In some implementations, the camera module 60 of the present application may include a filter 90. The filter 90 is disposed between the optical imaging system 70 and the image sensor 80. The filter 90 is located on the image side of the optical imaging system 70. The light emitted from the optical imaging system 70 may pass through the optical filter 90 and then enter the image sensor 80. In some examples, the filter 90 may be an infrared filter 90, which is used to filter infrared light, so as to avoid the infrared light from reaching the imaging surface S18 of the optical imaging system 70, and effectively reduce the possibility of interference of the infrared light on normal imaging.

The optical imaging system 70 of the present application includes a first lens group 71 and a second lens group 72. The first lens group 71 and the second lens group 72 are disposed in order along the optical axis O in a direction from the object side to the image side. The light of the object side may pass through the first lens group 71 along the optical axis O, and then the light exiting from the first lens group 71 passes through the second lens group 72 along the optical axis O. The imaging surface S18 of the optical imaging system 70 may be located on the image side of the second lens group 72. In the image capturing module 60 of the present application, the image sensor 80 may be disposed on the image side of the second lens group 72.

In some implementations, the camera module 60 of the present application may include a filter 90. The filter 90 is disposed between the second lens group 72 and the image sensor 80. The filter 90 may be disposed on the image side of the second lens group 72.

Fig. 6 schematically shows the structure of a prism. Referring to fig. 5 and 6, the first lens group 71 of the present application includes a prism 61 and a first lens L1. The prism 61 is located on the incident side and has optical power. The prism 61 includes an entrance surface 611, a reflection surface 612, and an exit surface 613. The reflecting surface 612 serves to reflect light incident on the incident surface 611 to the exit surface 613. For example, the optical axis O may include an incident optical axis and an exit optical axis that are perpendicular to each other. The light of the object side may be incident on the prism 61 from the incident surface 611 along the incident optical axis. The prism 61 causes light rays passing through the incident surface 611 along the optical axis O to exit the exit surface 613 along the optical axis O after being reflected by the reflecting surface 612. For example, the light rays passing through the incident surface 611 are reflected by the reflecting surface 612 and then exit from the exit surface 613 along the exit optical axis.

The first lens L1 is located on the image side of the prism 61. The object side surface of the first lens L1 is glued with the exit surface 613 of the prism 61. For example, the object side surface of the first lens L1 and the exit surface 613 of the prism 61 may be glued by an optical glue. The incident surface 611 of the prism 61 is convex, and the image-side surface of the first lens element L1 is concave, such that the first lens group 71 has refractive power for deflecting light. Light having an angle of 0 ° with the optical axis O and light having an angle of more than 0 ° with the optical axis O can be incident on the prism 61 through the incident surface 611, so that more light can be incident on the optical imaging system 70 to increase the amount of light entering the optical imaging system 70. The concave surface of the first lens L1 may be used to collect light, so that it may be beneficial to ensure that all the light exiting the first lens L1 is incident on the second lens group 72.

In the present application, both the object side surface and the image side surface of the lens can be divided into a paraxial region and a circumferential region from the center of the surface to the radial direction. The paraxial region refers to a region near the optical axis O. If the surface of the lens is convex and the convex position is not defined, it means that the surface of the lens is convex at least in the paraxial region. If the surface of the lens is concave and the concave position is not defined, it means that the surface of the lens is concave at least in the paraxial region.

The second lens group 72 includes a refractive lens having optical power. The refractive lens has refractive power for deflecting light. Light rays exiting from the image side surface of the first lens L1 along the optical axis O may be incident on the second lens group 72 and pass through the refractive lens. The image sensor 80 may be disposed on the image side of the refractive lens.

The optical imaging system 70 of the embodiment of the present application includes a first lens group 71 and a second lens group 72. The first lens group 71 includes a prism 61 and a first lens L1. The first lens L1 is located on the image side of the prism 61. The prism 61 is bonded to the first lens L1. The prism 61 and the first lens L1 each have optical power, and thus have refractive power for deflecting light. Since the incident surface 611 of the prism 61 is convex, light having an angle of 0 ° with the optical axis O and light having an angle of greater than 0 ° with the optical axis O can enter the prism 61 through the incident surface 611, so that more light can be incident on the optical imaging system 70, further the light entering amount of the optical imaging system 70 can be effectively increased, and the field of view range of the optical imaging system 70 can be enlarged. Therefore, the optical imaging system 70 of the embodiment of the application is beneficial to improving the imaging definition of the optical imaging system 70 and meeting the requirements of long-range shooting of users. Meanwhile, since the incident surface 611 of the prism 61 is convex, the size of the prism 61 can be effectively controlled, thereby being beneficial to ensuring the compact structure of the optical imaging system 70, and further realizing the effective control of the size and the overall weight of the camera module 60.

In some realizable ways, the material of the prism 61 and the material of the first lens L1 may be the same in the first lens group 71. In some examples, the material of the prism 61 and the material of the first lens L1 may be glass.

In some implementations, the material of the prism 61 may be different from the material of the first lens L1 in the first lens group 71. In some examples, the material of prism 61 may be glass. The material of the first lens L1 may be plastic. After the prism 61 and the first lens L1 are each finished, they are bonded to form a unitary structure by gluing. The refractive index of the prism 61 may be different from that of the first lens L1. Because the materials of the prism 61 and the first lens L1 are different, the refractive index of the first lens L1 can be adjusted, which is favorable for reasonably controlling the refractive index of the prism 61 and the refractive index of the first lens L1, reducing the chromatic aberration generated between the two lenses, and reducing the possibility of generating total reflection ghost images due to overlarge deflection angles of light rays in the two lenses.

In some implementations, the prism 61 may be a triangular prism. The slope of the triangular prism may serve as the reflective surface 612. One convex surface of the triangular prism may be used as the incident surface 611. One plane of the triangular prism may be used as the exit surface 613.

In some implementations, fig. 7 schematically shows a partial structure of the camera module 60. Referring to fig. 7, the second lens group 72 may include five refractive lenses. Along the optical axis O from the object side to the image side, the five refractive lenses are a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, respectively. An air gap is provided between the second lens L2 and the first lens L1. The second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 have an air gap therebetween.

The light incident to the prism 61 may change the course of the light after passing through the prism 61. The light emitted from the prism 61 may be incident on the first lens L1. The light emitted from the first lens L1 may be incident on the second lens L2. The image sensor 80 may be disposed at the image side of the sixth lens L6. The light rays exiting from the second lens L2 may sequentially pass through the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, and then be incident on the image sensor 80.

In some examples, a filter 90 is disposed between the sixth lens L6 and the image sensor 80. The light emitted from the sixth lens L6 may be incident on the filter 90, and then the light passing through the filter 90 may reach the image sensor 80.

In some examples, optical imaging system 70 also includes stop STO, thereby facilitating an increase in the imaging quality of optical imaging system 70. The stop STO may be disposed between the first lens L1 and the second lens L2.

In some realizable manners, in the second lens group 72, the object-side surface and the image-side surface of each of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be aspheric. The aspheric design method can ensure that the lens has better design flexibility, so that the lens with smaller size and thinner thickness can have good aberration correcting performance. In addition, the aspherical lens has a feature that the curvature is continuously changed from the center of the lens to the periphery of the lens. The aspherical lens has a better radius of curvature characteristic than a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, so that the aspherical lens has a performance of improving distortion aberration and improving astigmatic aberration. With the aspherical lens, aberration occurring at the time of imaging can be advantageously eliminated, thereby contributing to improvement of imaging quality.

In some implementations, the camera module 60 may also include a lens barrel 100 (see fig. 5). The optical imaging system 70 includes a prism 61, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 that may be mounted in the lens barrel 100 to achieve an assembly fit to form a lens barrel.

In some realizable manners, the materials of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be plastics. The lens manufactured by plastic processing has a relatively light weight, which is advantageous for reducing the weight of the whole optical imaging system 70, and the plastic itself has a low processing cost, which is advantageous for reducing the processing cost of the whole optical imaging system 70.

In some realizable forms, the materials of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be glass. Alternatively, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are made of plastic, and the remaining lenses are made of glass.

In the optical imaging system 70 of the present application, the prism 61 is used for refracting the light from the object side, so that the incident light path of the optical imaging system 70 can be refracted, which is advantageous for reducing the size of the optical imaging system 70 in the direction of the refracted light path, i.e., shortening the longitudinal (e.g., the stacking direction of the second lens L2 to the sixth lens L6) size of the optical imaging system 70. By bonding the object side surface of the first lens L1 to the exit surface 613 of the prism 61 such that the optical axis of the first lens L1 is in the same direction as the optical axis of the second lens group 72 (e.g., each of the second lens L2 to the sixth lens L6), the first lens L1 does not occupy a space in the lateral direction (e.g., the direction in which light on the object side is incident on the entrance surface 611 of the prism 61), which is advantageous in downsizing the optical imaging system 70 in the lateral direction, and thus can be advantageous in applying the optical imaging system 70 to electronic devices 10 requiring a high element miniaturization, such as electronic devices 10 having a small thickness. Since the prism 61 is disposed on the incident side of the optical imaging system 70, the distance of the incident light adjusted by the lens group can be effectively increased, which is beneficial to increasing the focal length of the optical imaging system 70, so that the optical imaging system 70 has a long-focus characteristic to achieve the effect of long-range shooting.

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: 3.1< f1/f <2, where f1 is the effective focal length of the first lens group 71 and f is the effective focal length of the optical imaging system 70. The effective focal length is reasonably configured, so that the optical imaging system 70 has good long-focus characteristic, and the total length of the optical imaging system 70 in the longitudinal direction is reduced, thereby realizing the miniaturization design of the camera module 60 and simultaneously ensuring that the camera module 60 has good imaging quality.

In some examples, f1/f may be-1.81, -2.90, 1.98, -1.56, -2.06, or-3.05.

In some examples, the effective focal length f1 of the first lens group 71 may be-26.86 millimeters (mm), and the effective focal length f of the optical imaging system 70 may be 14.8 millimeters (mm).

Alternatively, the effective focal length f1 of the first lens group 71 may take a value of-40 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 13.77 millimeters (mm).

Alternatively, the effective focal length f1 of the first lens group 71 may take a value of 25 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 12.6 millimeters (mm).

Alternatively, the effective focal length f1 of the first lens group 71 may take a value of-22.74 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 14.6 millimeters (mm).

Alternatively, the effective focal length f1 of the first lens group 71 may have a value of-32.88 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 16 millimeters (mm).

Alternatively, the effective focal length f1 of the first lens group 71 may have a value of-56.43 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 18.5 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: TTL/f <1.8, where TTL is a distance from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O, and f is an effective focal length of the optical imaging system 70. When the optical imaging system 70 satisfies TTL/f <1.8, the optical imaging system 70 is beneficial to having good long focal length characteristics, and meanwhile, the total length of the optical imaging system 70 in the longitudinal direction can be reduced well, so as to realize the miniaturized design of the camera module 60.

In some examples, the TTL/f can be 1.68, 1.74, 1.71, 1.56, 1.36, or 1.42.

In some examples, the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 24.9 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 14.8 millimeters (mm).

Alternatively, the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 24 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 13.77 millimeters (mm).

Alternatively, the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 21.6 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 12.6 millimeters (mm).

Alternatively, the distance TTL from the object side surface S1 of the first lens assembly 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 22.8 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 14.6 millimeters (mm).

Alternatively, the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 21.8 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 16 millimeters (mm).

Alternatively, the distance TTL from the object side surface S1 of the first lens assembly 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O may have a value of 26.2 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 18.5 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: -0.6 +.ltoreq.R1+R2)/(R1-R2) +.0.5, wherein in the first lens group 71, R1 is the radius of curvature of the entrance face of the first lens group 71 (the entrance surface 611 of the prism 61), and R2 is the radius of curvature of the exit face of the first lens group 71 (the image side face of the first lens L1). When the optical imaging system 70 satisfies-0.6 +.r1+r2)/(r1—r2) +.0.5, it is advantageous to reduce the angle of deflection of the light rays in the first lens group 71 by controlling the radius of curvature of the incident surface 611 of the prism 61 and the image side of the first lens L1, thereby reducing the possibility of generating strong total reflection ghost images due to an excessive angle of deflection of the light rays.

In some examples, (r1+r2)/(R1-R2) may be 0.50, 0.43, -0.52, -0.51, 0.47, or 0.44.

In some examples, (R1+R2) may have a value of-11.44 millimeters (mm) and (R1-R2) may have a value of-22.88 millimeters (mm).

Alternatively, (R1+R2) may have a value of-8.15 millimeters (mm) and (R1-R2) may have a value of-18.96 millimeters (mm).

Alternatively, (R1+R2) may have a value of 34.02 millimeters (mm) and (R1-R2) may have a value of-65.43 millimeters (mm).

Alternatively, (R1+R2) may have a value of-9.0 millimeters (mm) and (R1-R2) may have a value of 17.65 millimeters (mm).

Alternatively, (R1+R2) may have a value of-7.41 millimeters (mm) and (R1-R2) may have a value of-15.67 millimeters (mm).

Alternatively, (R1+R2) may have a value of-7.13 millimeters (mm) and (R1-R2) may have a value of-16.32 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: 0< ct1/f <0.7, where CT1 is the center thickness of the first lens group 71 on the optical axis O, and f is the effective focal length of the optical imaging system 70. When the optical imaging system 70 satisfies 0< ct1/f <0.7, the total length of the optical imaging system 70 in the longitudinal direction is reduced, and the optical imaging system 70 is ensured to have a longer focal length, so that the optical imaging system 70 is facilitated to realize a good long-range shooting effect.

In some examples, CT1/f may be 0.63, 0.64, 0.70, 0.60, 0.57, or 0.54.

In some examples, the central thickness CT1 of the first lens group 71 on the optical axis O may have a value of 9.34 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 14.8 millimeters (mm).

Alternatively, the central thickness CT1 of the first lens group 71 on the optical axis O may take a value of 8.76 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 13.77 millimeters (mm).

Alternatively, the central thickness CT1 of the first lens group 71 on the optical axis O may take a value of 8.76 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 12.6 millimeters (mm).

Alternatively, the central thickness CT1 of the first lens group 71 on the optical axis O may take a value of 8.76 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 14.6 millimeters (mm).

Alternatively, the central thickness CT1 of the first lens group 71 on the optical axis O may take a value of 9.18 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 16 millimeters (mm).

Alternatively, the central thickness CT1 of the first lens group 71 on the optical axis O may take a value of 10 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 18.5 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: f/EPD is less than or equal to 2.1, wherein f is the effective focal length of the optical imaging system 70, and EPD (Entrance Pupil Diameter) is the entrance pupil diameter of the optical imaging system 70. When the f/EPD of the optical imaging system 70 is less than or equal to 2.1, the light passing amount of the optical imaging system 70 can be increased on the premise of maintaining the good long-focus characteristic of the optical imaging system 70, so that the imaging performance is improved. Even if shooting is performed in a darker environment, clear imaging effects can be advantageously achieved.

In some examples, the f/EPD may be 2.01, 2.00, 1.95, or 2.10.

In some examples, the effective focal length f of the optical imaging system 70 may be 14.8 millimeters (mm) in value, while the entrance pupil diameter EPD of the optical imaging system 70 may be 7.36 millimeters (mm) in value.

Alternatively, the effective focal length f of the optical imaging system 70 may take a value of 13.77 millimeters (mm), and the entrance pupil diameter EPD of the optical imaging system 70 may take a value of 6.89 millimeters (mm).

Alternatively, the effective focal length f of the optical imaging system 70 may take a value of 12.6 millimeters (mm), and the entrance pupil diameter EPD of the optical imaging system 70 may take a value of 6.3 millimeters (mm).

Alternatively, the effective focal length f of the optical imaging system 70 may take a value of 14.6 millimeters (mm), and the entrance pupil diameter EPD of the optical imaging system 70 may take a value of 7.3 millimeters (mm).

Alternatively, the effective focal length f of the optical imaging system 70 may take the value of 16 millimeters (mm), while the entrance pupil diameter EPD of the optical imaging system 70 may take the value of 8.21 millimeters (mm).

Alternatively, the effective focal length f of the optical imaging system 70 may take a value of 18.5 millimeters (mm), and the entrance pupil diameter EPD of the optical imaging system 70 may take a value of 8.81 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: -7< f3_5/f <1.1, where f is the effective focal length of the optical imaging system 70 and f3_5 is the combined focal length of the third lens L3, the fourth lens L4 and the fifth lens L5. When the optical imaging system 70 satisfies-7 < f3_5/f <1.1, coma and astigmatism generated by the three lenses L3, the fourth lens L4 and the fifth lens L5 of Heng Di can be effectively leveled by reasonably controlling the ratio range of f3_5 and f, which is beneficial to improving imaging quality.

In some examples, f3_5/f may be 0.55, 0.36, 1.09, 0.36, -6.81, or-3.51.

In some examples, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of 8.13 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 14.8 millimeters (mm).

Alternatively, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of 4.96 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 13.77 millimeters (mm).

Alternatively, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of 13.71 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 12.6 millimeters (mm).

Alternatively, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of 5.25 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 14.6 millimeters (mm).

Alternatively, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of-108.98 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 16 millimeters (mm).

Alternatively, the combined focal length f3_5 of the third lens L3, the fourth lens L4, and the fifth lens L5 may have a value of-64.88 millimeters (mm), and the effective focal length f of the optical imaging system 70 may have a value of 18.5 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: -1.3< f6/f <1.7, where f6 is the focal length of the sixth lens L6 and f is the effective focal length of the optical imaging system 70. When the optical imaging system 70 satisfies-1.3 < f6/f <1.7, the optical imaging system 70 has good long-focus characteristics, so as to reduce the total length of the optical imaging system 70, realize the miniaturized design of the camera module 60, and simultaneously be beneficial to the optical imaging system 70 having good imaging quality.

In some examples, f6/f may be-0.88, -0.74, -1.27, -0.65, 1.68, or 1.65.

In some examples, the focal length f6 of the sixth lens L6 may have a value of-13.07 millimeters (mm), while the effective focal length f of the optical imaging system 70 may have a value of 14.8 millimeters (mm).

Alternatively, the focal length f6 of the sixth lens L6 may take a value of-10.21 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 13.77 millimeters (mm).

Alternatively, the focal length f6 of the sixth lens L6 may take a value of-15.98 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 12.6 millimeters (mm).

Alternatively, the focal length f6 of the sixth lens L6 may take a value of-9.46 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 14.6 millimeters (mm).

Alternatively, the focal length f6 of the sixth lens L6 may take a value of 26.89 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 16 millimeters (mm).

Alternatively, the focal length f6 of the sixth lens L6 may take a value of 30.48 millimeters (mm), and the effective focal length f of the optical imaging system 70 may take a value of 18.5 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: 0< AT12/AT56<22, wherein AT12 is the distance between the first lens group and the second lens L2 on the optical axis O, and AT56 is the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O. When the optical imaging system 70 satisfies 0< AT12/AT56<22, the field curvature of the optical imaging system 70 can be effectively ensured, so that the off-axis field of the optical imaging system 70 has good imaging quality, and the total length of the optical imaging system 70 can be effectively compressed.

In some examples, the AT12/AT56 may be 1.79, 1.89, 0.27, 19.00, 21.40, or 21.20.

In some examples, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 0.86 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.48 millimeters (mm).

Alternatively, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 0.66 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.35 millimeters (mm).

Alternatively, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 0.11 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.41 millimeters (mm).

Alternatively, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 0.95 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.05 millimeters (mm).

Alternatively, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 1.07 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.05 millimeters (mm).

Alternatively, the distance AT12 between the first lens group 71 and the second lens L2 on the optical axis O may have a value of 1.06 millimeters (mm), and the distance between the fifth lens L5 and the sixth lens L6 on the optical axis O may have a value of 0.05 millimeters (mm).

In some implementations, the optical imaging system 70 of the present application may satisfy the following conditions: 1.5< (CT2+CT3)/CT 6<3.7, wherein CT2 is the center thickness of the second lens L2 on the optical axis O, CT3 is the center thickness of the third lens L3 on the optical axis O, and CT6 is the center thickness of the sixth lens L6 on the optical axis O. When the optical imaging system 70 satisfies 1.5< (CT 2+ct 3)/CT 6<3.7, the thickness sensitivity of the optical imaging system 70 is effectively reduced, chromatic aberration of the optical imaging system 70 is corrected, and imaging quality is improved by matching the center thickness of the second lens L2, the center thickness of the third lens L3, and the center thickness of the sixth lens L6.

In some examples, (cθ2+c3)/CT 6 may be 1.98, 1.51, 1.67, 2.95, 2.35, or 3.63.

In some examples, (c2+c3) may take a value of 1.98 millimeters (mm), while the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1 millimeter (mm).

Alternatively, (c2+c3) may take a value of 1.51 millimeters (mm), and the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1 millimeter (mm).

Alternatively, (c2+c3) may take a value of 1.67 millimeters (mm), and the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1 millimeter (mm).

Alternatively, (c2+c3) may take a value of 3.77 millimeters (mm), and the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1.28 millimeters (mm).

Alternatively, (c2+c3) may take a value of 3.15 millimeters (mm), and the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1.34 millimeters (mm).

Alternatively, (c2+c3) may take a value of 3.88 millimeters (mm), and the center thickness CT6 of the sixth lens L6 on the optical axis O may take a value of 1.07 millimeters (mm).

The optical imaging system 70 according to the above embodiment of the present application may employ a plurality of lenses, for example, the optical imaging system 70 may include seven lenses, that is, a prism 61, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the spacing on the optical axis O between each lens, and the like, the volume of the optical imaging system 70 can be effectively reduced, the sensitivity of the optical imaging system 70 can be reduced, and the workability of the optical imaging system 70 can be improved, so that the optical imaging system 70 is more beneficial to production and processing. The optical imaging system 70 can have the characteristics of long focus, short lens depth and the like under the condition of ensuring better imaging quality, so that the imaging system is well suitable for long-range shooting.

It will be appreciated that the number of lenses included in the optical imaging system 70 may be adjusted to achieve the various results and advantages described herein without departing from the scope of the claimed application. For example, while the description is given by taking the example in which the optical imaging system 70 includes seven lenses, the present application is not particularly limited thereto, and the optical imaging system 70 of the present application may include other numbers of lenses.

The specific implementation of the optical imaging system 70 provided by embodiments of the present application is further described below.

Example 1:

referring to fig. 7, the effective focal length EFL of the optical imaging system 70 is equal to 14.8 millimeters (mm), i.e., f is equal to 14.8 millimeters (mm); f-number FNO is equal to 2.01; the maximum field of view FOV is equal to 28.6 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 24.9 millimeters (mm).

The first lens group has a negative focal power. The object side surface S1 of the first lens group 71 is convex. The image side surface S4 of the first lens group 71 is concave. The incident surface 611 of the prism 61 is the object side surface S1 of the first lens group 71. The reflecting surface 612 of the prism 61 is the surface S2 of the first lens group 71. The exit surface 613 of the prism 61 and the object side of the first lens L1 together form a surface S3. The image side surface of the first lens L1 is the image side surface S4 of the first lens group 71.

The second lens L2 has a positive focal power. The object side surface S6 of the second lens L2 is convex. The image side surface S7 of the second lens L2 is convex.

The third lens L3 has a positive focal power. The object side surface S8 of the third lens L3 is convex. The image side surface S9 of the third lens L3 is convex.

The fourth lens L4 has negative focal power. The object side surface S10 of the fourth lens L4 is concave. The image side surface S11 of the fourth lens L4 is concave.

The fifth lens L5 has positive focal power. The object side surface S12 of the fifth lens element L5 is convex. The image side surface S13 of the fifth lens L5 is convex.

The sixth lens L6 has positive focal power. The object side surface S14 of the sixth lens L6 is convex. The image side surface S15 of the sixth lens L6 is concave.

The filter 90 has an object side surface S16 and an image side surface S17.

Table 1 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of embodiment 1, wherein the radii of curvature and thicknesses are each in millimeters (mm).

TABLE 1

Table 2 is the aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for an aspherical lens:

TABLE 2

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Referring to fig. 8, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system shows the deviation of the converging focus of light rays with different wavelengths at the paraxial object point from the ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 8 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays after converging via the optical imaging system 70 is in the range of-0.02 mm to 0.02 mm. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in embodiment 1 are within a small range, and the spherical aberration in the imaging picture and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 9, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled.

Referring to fig. 10, the Distortion map (Distortion) of the optical imaging system 70 is shown, and it is known that the Distortion of the optical imaging system 70 is small, so that the image Distortion caused by the main beam is small, and the imaging quality is good.

Example 2:

referring to fig. 11, the effective focal length EFL of the optical imaging system 70 is equal to 13.77 millimeters (mm), i.e., f is equal to 13.77 millimeters (mm); f-number FNO is equal to 2.00; the maximum field angle FOV is equal to 31.0 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 24.0 millimeters (mm).

The first lens group has a negative focal power. The object side surface S1 of the first lens group 71 is convex. The image side surface S4 of the first lens group 71 is concave.

The second lens L2 has a negative focal power. The object side surface S6 of the second lens L2 is convex. The image side surface S7 of the second lens L2 is concave.

The third lens L3 has negative focal power. The object side surface S8 of the third lens L3 is convex. The image side surface S9 of the third lens L3 is concave.

The fourth lens L4 has negative focal power. The object side surface S10 of the fourth lens L4 is convex. The image side surface S11 of the fourth lens L4 is concave.

The sixth lens L6 has negative focal power. The object side surface S14 of the sixth lens L6 is convex. The image side surface S15 of the sixth lens L6 is concave.

Table 3 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of example 2, in which the unit of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 3 Table 3

Table 4 shows aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for aspherical lenses:

TABLE 4 Table 4

Referring to fig. 12, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system shows the deviation of the converging focus of light rays with different wavelengths at paraxial object points from an ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 12 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays is in the range of-0.05 mm to 0.05mm after converging via the optical imaging system 70. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in embodiment 2 are within a small range, and the spherical aberration in the imaging picture and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 13, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled.

Referring to fig. 14, the Distortion map (Distortion) of the optical imaging system 70 is shown, and it is known that the Distortion of the optical imaging system 70 is small, so that the image Distortion caused by the main beam is small, and the imaging quality is good.

Example 3:

referring to fig. 15, the effective focal length EFL of the optical imaging system 70 is equal to 12.6 millimeters (mm), i.e., f is equal to 12.6 millimeters (mm); f-number FNO is equal to 2.0; the maximum field of view FOV is equal to 33.16 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 21.6 millimeters (mm).

The first lens group 71 has positive focal power. The object side surface S1 of the first lens group 71 is convex. The image side surface S4 of the first lens group 71 is concave. The second lens L2 has a positive focal power. The object side surface S6 of the second lens L2 is concave. The image side surface S7 of the second lens L2 is convex. The third lens L3 has a positive focal power. The object side surface S8 of the third lens L3 is concave. The image side surface S9 of the third lens L3 is convex. The fourth lens L4 has negative focal power. The object side surface S10 of the fourth lens L4 is concave. The image side surface S11 of the fourth lens L4 is concave. The fifth lens L5 has positive focal power. The object side surface S12 of the fifth lens element L5 is convex. The image side surface S13 of the fifth lens L5 is convex. The sixth lens L6 has negative focal power. The object side surface S14 of the sixth lens L6 is convex. The image side surface S15 of the sixth lens L6 is concave.

Table 5 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of example 3, in which the unit of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 5

Table 6 is the aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for an aspherical lens:

TABLE 6

Referring to fig. 16, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system shows the deviation of the converging focus of light rays with different wavelengths at the paraxial object point from the ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 16 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays after converging via the optical imaging system 70 is in the range of-0.02 mm to 0.02 mm. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in embodiment 3 are within a small range, and the spherical aberration in the imaging picture and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 17, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled. Referring to fig. 18, the Distortion map (Distortion) of the optical imaging system 70 is shown, and it is known that the Distortion of the optical imaging system 70 is small, so that the image Distortion caused by the main beam is small, and the imaging quality is good.

Example 4:

referring to fig. 19, the effective focal length EFL of the optical imaging system 70 is equal to 14.6 millimeters (mm), i.e., f is equal to 14.6 millimeters (mm); f-number FNO is equal to 2.0; the maximum field of view FOV is equal to 28.8 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 22.8 millimeters (mm).

The first lens group has a negative focal power. The object side surface S1 of the first lens group 71 is convex. The image side surface S4 of the first lens group 71 is concave. The second lens L2 has a positive focal power. The object side surface S6 of the second lens L2 is convex. The image side surface S7 of the second lens L2 is concave. The third lens L3 has a positive focal power. The object side surface S8 of the third lens L3 is convex. The image side surface S9 of the third lens L3 is concave. The fourth lens L4 has positive focal power. The object side surface S10 of the fourth lens L4 is convex. The image side surface S11 of the fourth lens L4 is concave. The fifth lens L5 has positive focal power. The object side surface S12 of the fifth lens L5 is concave. The image side surface S13 of the fifth lens L5 is convex. The sixth lens L6 has negative focal power. The object side surface S14 of the sixth lens L6 is convex. The image side surface S15 of the sixth lens L6 is concave.

Table 7 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of example 4, in which the unit of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 7

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Table 8 is the aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for an aspherical lens:

TABLE 8

Referring to fig. 20, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system 70 shows the deviation of the converging focus of light rays with different wavelengths at paraxial object points from an ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 20 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays after converging via the optical imaging system 70 is in the range of-0.08 mm to 0.08 mm. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in embodiment 4 are within a small range, and the spherical aberration in the imaging frame and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 21, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled.

Referring to fig. 22, the Distortion map (Distortion) of the optical imaging system 70 shows that the Distortion of the optical imaging system 70 is small, so that the Distortion of the image caused by the main beam is small and the imaging quality is good.

Example 5:

referring to fig. 23, the effective focal length EFL of the optical imaging system 70 is equal to 16.0 millimeters (mm), i.e., f is equal to 16.0 millimeters (mm); f-number FNO is equal to 1.95; the maximum field of view FOV is equal to 26.4 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 21.8 millimeters (mm).

The first lens group 71 has negative focal power. The object side surface S1 of the first lens assembly 71 is convex in the paraxial region. The image side surface S4 of the first lens group 71 is concave.

The fourth lens L4 has positive focal power. The object side surface S10 of the fourth lens L4 is convex. The image side surface S11 of the fourth lens L4 is convex.

The fifth lens L5 has negative focal power. The object side surface S12 of the fifth lens L5 is concave. The image side surface S13 of the fifth lens L5 is convex.

Table 9 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of example 5, in which the unit of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 9

Table 10 is the aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for an aspherical lens:

table 10

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Referring to fig. 24, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system 70 shows the deviation of the converging focus of light rays with different wavelengths at paraxial object points from an ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 24 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays after converging via the optical imaging system 70 is in the range of-0.05 mm to 0.05 mm. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in embodiment 5 are within a small range, and the spherical aberration in the imaging frame and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 25, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled.

Referring to fig. 26, the Distortion map (Distortion) of the optical imaging system 70 is shown, and it is known that the Distortion of the optical imaging system 70 is small, so that the image Distortion caused by the main beam is small, and the imaging quality is good.

Example 6:

referring to fig. 27, the effective focal length EFL of the optical imaging system 70 is equal to 18.5 millimeters (mm), i.e., f is equal to 18.5 millimeters (mm); f-number FNO is equal to 2.1; the maximum field angle FOV is equal to 22.9 °; the distance TTL from the object side surface S1 of the first lens group 71 to the imaging surface S18 of the optical imaging system 70 on the optical axis O is equal to 26.2 millimeters (mm).

The first lens group 71 has negative focal power. The object side surface S1 of the first lens group 71 is convex. The image side surface S4 of the first lens group 71 is concave.

Table 11 shows the surface types, radii of curvature, thicknesses, materials, refractive indices, abbe numbers, focal lengths, and combined focal lengths of the respective lenses of the optical imaging system 70 of example 6, in which the unit of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 11

Table 12 is the aspherical higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, a20 for an aspherical lens:

table 12

Referring to fig. 28, a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical imaging system 70 shows the deviation of the converging focus of light rays with different wavelengths at paraxial object points from an ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) of the light converging image plane from the ideal image plane. The wavelengths of light rays used in fig. 28 are 435.8400nm, 486.1300nm, 546.0700nm, 587.5600nm, 656.2700nm, respectively, and the focus offset of the five light rays after converging via the optical imaging system 70 is in the range of-0.05 mm to 0.05 mm. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation and the deviation from the ideal image plane of the light beams with each wavelength in example 6 are within a small range, and the spherical aberration in the imaging frame and the chromatic spherical aberration between different wavebands are well corrected.

Referring to fig. 29, a field curvature map (Astigmatic Field Curves) of the optical imaging system 70 is shown, wherein the X1, X2, X3, X4, and X5 curves represent meridian field curvature. The Y1, Y2, Y3, Y4 and Y5 curves represent sagittal curvature of field. From the figure, both the sagittal field curvature and the meridional field curvature are controlled within a small range, so that the curvature of the imaging surface S18 is well controlled.

Referring to fig. 30, the Distortion map (Distortion) of the optical imaging system 70 is shown, and it is known that the Distortion of the optical imaging system 70 is small, so that the image Distortion caused by the main beam is small, and the imaging quality is good.

In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The embodiments of the application may be implemented or realized in any number of ways, including as a matter of course, such that the apparatus or elements recited in the claims are not necessarily oriented or configured to operate in any particular manner. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more unless specifically stated otherwise.

The terms first, second, third, fourth and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The term "plurality" herein refers to two or more. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship; in the formula, the character "/" indicates that the front and rear associated objects are a "division" relationship.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiment of the present application, the sequence number of each process does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.

Claims

1. An optical imaging system, comprising at least:

a first lens group including a prism located at an incident side and having optical power, the prism including an incident surface for reflecting light incident on the incident surface to the exit surface, a reflecting surface that is convex, and an exit surface along which light passing through the incident surface along an optical axis is emitted after being reflected by the reflecting surface, the first lens being located at an image side of the prism, an object side surface of the first lens being cemented with the exit surface of the prism, the first lens having optical power, an image side surface of the first lens being concave;

A second lens group, the first lens group and the second lens group being disposed in order from an object side to an image side along an optical axis, the second lens group including a refractive lens having optical power, a light ray exiting from the image side of the first lens along the optical axis being incident to the second lens group and passing through the refractive lens;

in the first lens group, the radius of curvature of the incident surface of the first lens group is R1, and the radius of curvature of the exit surface of the first lens group is R2, which satisfies the following conditions: -0.6 < R1+ R2)/(R1-R2) < 0.5;

the center thickness of the first lens group on the optical axis is CT1, the effective focal length of the optical imaging system is f, and the following conditions are satisfied: 0< CT1/f <0.7;

the effective focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is EPD, and the following conditions are satisfied: f/EPD is less than or equal to 2.1.

2. The optical imaging system according to claim 1, wherein the second lens group includes five refractive lenses, the five refractive lenses being a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively, in a direction from an object side to an image side along an optical axis, the second lens and the first lens having an air gap therebetween, and any adjacent two of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens having an air gap therebetween.

3. The optical imaging system of claim 2, wherein the effective focal length of the first lens group is f1, and the effective focal length of the optical imaging system is f, satisfying the following condition: -3.1< f1/f <2.

4. An optical imaging system according to claim 2 or 3, wherein the distance between the object side surface of the first lens group and the imaging surface of the optical imaging system on the optical axis is TTL, and the effective focal length of the optical imaging system is f, which satisfies the following condition: TTL/f <1.8.

5. The optical imaging system of claim 2 or 3, wherein an effective focal length of the optical imaging system is f, a combined focal length of the third lens, the fourth lens, and the fifth lens is f3_5, and the following condition is satisfied: -7< f3_5/f <1.1.

6. An optical imaging system according to claim 2 or 3, wherein the effective focal length of the optical imaging system is f and the focal length of the sixth lens is f6, satisfying the following condition: -1.3< f6/f <1.7.

7. The optical imaging system according to claim 2 or 3, wherein the first lens group and the second lens group are spaced apart by an AT12 distance on the optical axis, and the fifth lens and the sixth lens group are spaced apart by an AT56 distance on the optical axis, satisfying the following condition: 0< AT12/AT56<22.

8. An optical imaging system according to claim 2 or 3, wherein the center thickness of the second lens on the optical axis is CT2, the center thickness of the third lens on the optical axis is CT3, and the center thickness of the sixth lens on the optical axis is CT6, satisfying the following condition: 1.5< (CT2+CT3)/CT 6<3.7.

9. The optical imaging system of claim 2 or 3, wherein the object side surface and the image side surface of each of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical surfaces.

10. An optical imaging system according to any one of claims 1 to 3, wherein in the first lens group, the prism is of a material different from that of the first lens.

11. A camera module, comprising:

the optical imaging system of any of claims 1 to 10;

and the image sensor is arranged on the image side of the optical imaging system.

12. The camera module of claim 11, further comprising a filter disposed between the second lens group and the image sensor.

13. An electronic device, comprising:

a housing;

the camera module of claim 11 or 12, the camera module being disposed within the housing.