CN114125407A

CN114125407A - Camera module and electronic equipment

Info

Publication number: CN114125407A
Application number: CN202010890863.6A
Authority: CN
Inventors: 於丰; 徐骏; 周晓松
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-08-29
Filing date: 2020-08-29
Publication date: 2022-03-01
Also published as: WO2022041990A1

Abstract

The application provides a camera module and electronic equipment, relates to electronic equipment technical field. This camera module includes lens group, image sensor and angle selection sees through the film, wherein: the lens group comprises a plurality of lenses arranged from the object side to the image side; the image sensor is arranged at the image side of the lens group; the angle selective transmission film is arranged on the object side of the image sensor and used for transmitting the incidence with the incidence angle larger than or equal to 0 degrees and smaller than or equal to thetat; and the lens is used for blocking incident light rays with the incident angle larger than theta t and smaller than or equal to 90 degrees from entering the camera module. In this application embodiment, the angle selection sees through the film and can select different incident angle's light to make the light that satisfies the incident angle requirement can get into camera module and participate in the formation of image, and block the light that does not satisfy the incident requirement, thereby can effectual improvement camera module's formation of image effect.

Description

Camera module and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a camera module and electronic equipment.

Background

With the development of the technology, the requirement of the user on the photographing quality of the mobile phone lens is higher and higher. The glare and the ghost are key factors influencing the imaging quality of the lens, and are problems to be overcome by those skilled in the art in the process of lens development.

At present, in order to overcome this problem, the design of the lens structure is generally adjusted, or the non-light-transmitting area of the lens structure is blackened to reduce the occurrence of stray light. However, the conventional processing means has a relatively large influence on light rays for imaging in a field of view (FOV) range, but has a relatively poor effect on eliminating stray light rays outside the FOV range, so that stray light rays enter the lens to affect the imaging effect.

In many scenes, in order to avoid glare caused by light rays in a non-FOV range, the design of a lens is complicated, for example, the complexity of a structure is increased; it may even be necessary to sacrifice some other optical properties, such as reducing the aperture, etc.

Disclosure of Invention

The application provides a camera module and electronic equipment to effectively reduce the glare that the light in the FOV scope brought, improve the imaging quality of camera module.

In a first aspect, the present application provides a camera module that can include a lens set, an image sensor, and an angle selective transmission film. The lens group includes a plurality of lenses arranged in order from an object side to an image side, and the lenses may be lenses or non-lenses. The image sensor is arranged at the image side of the lens group and used for receiving the light rays transmitted by the lens group and imaging. The angle selective transmission film is arranged on the object side of the image sensor, can be used for transmitting incident light rays with an incident angle larger than or equal to 0 degrees and smaller than or equal to theta t and blocking the incident light rays with the incident angle larger than or equal to theta t and smaller than or equal to 90 degrees from entering the camera module, and the theta t is larger than or equal to 0 degrees and smaller than 90 degrees. In the embodiment of the application, the angle selection is arranged on the object side of the image sensor and the film is passed through, so that light rays with different incident angles can be selected through the angle selection and transmission film, the light rays meeting the incident angle requirements can enter the camera module to participate in imaging, the light rays not meeting the incident requirements are blocked, and the imaging effect of the camera module can be effectively improved.

The blocking of the light not meeting the incident requirement by the angle selective transmission film may include reflecting or absorbing the light, and the like, and may be realized by the material of the angle selective transmission film. In one possible implementation of the present application, the angle selective transmission film may be a black light absorbing material, including but not limited to a material made of black resin, black metal, black nonmetal (silicon), and the like. Therefore, the proper angle can be selected according to the FOV requirement of the camera module to select the transmission film.

Further, the transmittance of the angular permselective film can be adjusted by selecting the material of the angular permselective film. Illustratively, the angle-selective transmission through the film can be greater than or equal to 80%, illustratively 90%, 95%, or even 100% for light rays having an angle of incidence greater than or equal to 0 ° and less than or equal to θ t; in addition, the transmission of the angularly selective transmission film is less than or equal to 10%, illustratively 5%, 3%, or even 1% or less, for light rays having an incident angle greater than θ t and less than or equal to 90 °. Thereby the imaging quality of effectual improvement camera module.

In one possible implementation manner of the present application, when the angle selective transmission film is specifically arranged, the thickness of the angle selective transmission film is also an important influence factor of light transmission, and the thickness can be selected according to the stray light and θ t which need to be blocked. Illustratively, the thickness of the angularly selective transmission film may satisfy: h is 0.1k/tan (θ t) mm, where k is a quality factor of stray light, and a value of k is greater than or equal to 0.5 and less than or equal to 1.5. Thereby effectively blocking stray light.

In one possible implementation manner of the present application, the angle selective transmission film may be formed by stacking films, and may include multiple layers of dielectric films, at least two layers of dielectric films have different optical refractive indexes, and each layer of dielectric film may have a thickness of 50 to 200 nm. Therefore, the angle selective transmission film can realize the selective transmission of light rays based on the principle that the multilayer medium film interferes the light rays.

In one possible implementation manner of the application, the angle selective transmission film can be a single-layer film structure, the single-layer film structure can be provided with a deep hole according to the randomized deep hole principle, and light which does not meet the incident angle can only be projected on the side wall of the deep hole to be absorbed by adjusting the ratio of the hole depth and the aperture of the deep hole, so that the light cannot penetrate through the deep hole; and the light meeting the requirement of the incident angle can directly penetrate through the deep hole so as to realize the selection of the light. Wherein, the ratio of the radius r of the deep hole on the angle selective transmission film to the hole depth H can satisfy: and r/H is tan (θ t), so that light rays with an incident angle of more than or equal to 0 ° and less than or equal to θ t can enter the camera module through the deep hole.

Because the field of view of lens group has decided the field of view scope of camera module, consequently, can make thetat be less than or equal to the half field of view of lens group to can make the incident ray in the field of view scope can see through the angle and select to see through the film and participate in the formation of image.

In a possible implementation manner of the present application, an optical anti-shake function may be further integrated in the lens assembly, and at this time, when the light transmission angle θ t of the angular selective transmission film is set, the anti-shake angle OIS _ angle of the lens assembly needs to be considered, and at this time, the light transmission angle θ t of the angular selective transmission film may be greater than or equal to the sum of HFOV + OIS _ angle. The influence on the light selective transmission caused by the shaking of the camera module is avoided, so that the camera module has better imaging quality.

In one possible implementation manner of the present application, when the angle permselective film is disposed in the camera module, the angle permselective film may be disposed at an object side of the lens assembly. Alternatively, the angle selective transmission film may be disposed between the lens group and the image sensor. As long as it is possible to select the light for imaging projected on the image sensor.

In a possible implementation of this application, because the light that comes from the object surface reflection includes visible light and infrared light, when these light got into the camera module simultaneously, the formation of image that the infrared light can be to visible light produced the influence. Like this, can also make camera module include infrared filter, this infrared filter can set up between lens group and image sensor to infrared light that can effectual filtering throw on image sensor, thereby improve the formation of image effect of camera module. In addition, in this implementation, the angle selective transmission film may be disposed between the lens group and the infrared filter to select light incident into the camera module.

In a possible implementation manner of the present application, the lens group of the camera module may be a vertical lens group or a periscopic lens group, and when the lens group is the vertical lens group or the periscopic lens group, the angle selective transmission film may be disposed at an object side of the lens group or disposed between the lens group and the image sensor.

In another possible implementation manner of the present application, the lens group may also be a combination of an upright lens subgroup and a periscopic lens subgroup. In this case, when the angle permselective film is specifically disposed, the angle permselective film may be one, and the angle permselective film has a first region disposed corresponding to the upright lens group and a second region disposed corresponding to the periscopic lens group. The structure of the camera module can be effectively simplified by the arrangement mode. In addition, the angle selective transmission film can simultaneously control the angle of the light rays of the vertical lens sub-group and the periscopic lens sub-group, so that the stray light of the whole camera module is reduced.

In addition, when the lens group is a combination of the vertical lens subgroup and the periscopic lens subgroup, the camera module may also be provided with an angle selective transmission film corresponding to each of the vertical lens subgroup and the periscopic lens subgroup. The angle selection transparent film corresponding to the vertical lens sub-group is arranged on the object side of the vertical lens sub-group, or is arranged between the vertical lens sub-group and the first image sensor corresponding to the vertical lens sub-group.

The camera module may further include a first infrared filter corresponding to the vertical lens sub-group, the first infrared filter is disposed between the vertical lens sub-group and the first image sensor, and the angle selective transmission film corresponding to the vertical lens sub-group may be further disposed between the vertical lens sub-group and the first infrared filter.

In another possible implementation of the present application, the periscopic lens subgroup may include an optical component and a horizontal lens component for changing a light transmission path, and the angle selective transmission film corresponding to the periscopic lens subgroup may be further disposed between the optical component and the horizontal lens component, or between the horizontal lens component and the second image sensor corresponding to the periscopic lens subgroup.

In addition, the camera module may further include a second infrared filter corresponding to the periscopic lens sub-group, the second infrared filter may be disposed between the horizontal lens assembly and the second image sensor, and the angle selective transmission film corresponding to the periscopic lens sub-group may be disposed between the horizontal lens assembly and the second infrared filter.

In addition to above-mentioned structure, in a possible implementation of this application, the camera module can also include the apron, and this apron can set up the object side that passes through other parts such as film 1, infrared filter, image sensor in lens group, the angle selection of camera module to play the effect of the protection such as waterproof, dustproof of lens group, angle selection transmission film, infrared filter, image sensor. The cover plate may be, but not limited to, a plate-shaped structure made of a transparent material such as glass to improve the transmittance of light.

In a second aspect, the present application further provides an electronic device, which includes a housing and the camera module in the embodiment of the first aspect, where the camera module can be specifically disposed in the housing. This electronic equipment's camera module sees through the film through setting up the angle selection to make the light of participating in the formation of image get into the camera module, and block the stray light's that does not participate in the formation of image entering, thereby can effectually promote the formation of image effect of camera module, and then can promote the user and feel to this electronic equipment's use.

Drawings

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

fig. 2 is a schematic structural diagram of a camera module according to another embodiment of the present application;

FIG. 3 is a graph of light transmittance through an angularly selective transmission film according to one embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 5 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 7a to 7d are comparison diagrams of imaging simulation results of the camera module and the comparison camera module according to the embodiment of the present application;

fig. 8 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 9 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 10a to 10f are comparison graphs of imaging simulation results of the camera module according to the embodiment of the present application and a comparison camera module;

fig. 11 is a schematic structural diagram of a camera module according to another embodiment of the present application;

FIG. 12 is a schematic view of an angle selective transmission film according to an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a camera module according to another embodiment of the present application;

fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For convenience in understanding the camera module provided in the embodiment of the present application, an application scenario of the camera module in the embodiment of the present application is first introduced. The camera module can be, but is not limited to, disposed in an electronic device such as a mobile phone, a tablet computer, a notebook computer, or a Personal Digital Assistant (PDA), so as to implement an image capturing function of the electronic device.

Referring to fig. 1, a camera module 100 may generally include a lens group 101, an infrared filter 102, and an image sensor 103. The infrared filter 102 is disposed between the lens group 101 and the image sensor 103. In general, the light entering the lens assembly 101 can be divided into two portions, one portion is light participating in imaging (such as light indicated by solid line in fig. 1) and the other portion is light not participating in imaging (such as light indicated by dashed line in fig. 1). The light rays participating in imaging converge on the surface of the image sensor 103 after passing through the lens group 101, so as to form an image. Light rays which do not participate in imaging are projected on the edge or other positions of the lens in the lens group 101 during the process of passing through the lens group 101, so that abnormal reflection is caused, and imaging is performed after the abnormal reflection reaches the image sensor 103, so that glare (flare) and ghost (ghost) are formed.

In an optical instrument, an angle formed by two edges of a lens, which is a vertex of the lens and allows an object image of a target to pass through the maximum range of the lens, is called a field of view (FOV). The angle of incidence (incident angle) is the angle of the incident ray from the normal to the incident surface.

Since the FOV of the lens assembly 101 determines the field of view of the camera module 100, the incident angles of the light rays participating in the imaging are all smaller than or equal to a half field of view (HFOV) of the lens assembly 101, while the light rays outside the FOV (hereinafter referred to as stray light) generally do not participate in the imaging, and may form flare and ghost images to affect the imaging quality of the camera module 100.

In order to improve the imaging quality of the camera module, the entrance of stray light needs to be reduced. At present, the structure design of the lens group 101 is usually adjusted, or the opaque region of the lens group 101 is atomized or blackened to reduce the entry of stray light. In some scenes, in order to avoid glare caused by light rays entering outside the FOV, the design of the lens is complicated; in other scenarios, it is even necessary to sacrifice some other optical performance, such as reducing the aperture.

The camera module 100 provided in the embodiment of the present application aims to solve the above-mentioned problem, so as to reduce the entry of stray light and improve the imaging quality of the camera module 100.

Referring to fig. 2, a camera module 100 according to an embodiment of the present disclosure may include a lens assembly 101, an angle selective transparent film 104, and an image sensor 103. The lens assembly 101 is an important component of the camera module 100, and mainly focuses light reflected from an object based on the principle of refraction and reflection of light. It is understood that, in the embodiment of the present application, the lens set 101 may be, but not limited to, a combination of an upright lens subset (e.g., a combination of at least two upright lens subsets), or a combination of a periscopic lens subset (e.g., a combination of at least two periscopic lens subsets), or a combination of an upright lens subset and a periscopic lens subset (e.g., a combination of at least one upright lens subset and at least one periscopic lens subset).

In order to fulfill the functions, the lens group 101 may generally include a plurality of lenses, which may be spherical lenses or aspherical lenses designed to be sequentially arranged from the object side to the image side of the camera module 100. For example, the lens group 101 may include 3 to 8 lenses, which may be selected according to the specific design requirement of the camera module 100. In addition, the lens can be made of transparent materials such as glass or plastic, but not limited to, so as to facilitate the transmission of light.

In order to improve the imaging effect of the camera module 100, it is generally desirable to increase the light entering the lens group 101 and having an incident angle within the FOV of the lens group 101 to enter the camera module 100 to participate in imaging, and decrease the light entering outside the FOV.

In the embodiment of the present application, the angle selective transmission film 104 can select light rays with different incident angles, so that light rays meeting the requirement of the incident angle can be transmitted, and light rays not meeting the requirement of the incident angle can be blocked. The blocking of the light not meeting the incident requirement by the angle selective transmission film 104 may include reflecting or absorbing the light, and may be implemented by the material of the angle selective transmission film 104. Illustratively, the angle selective transmission film 104 may be a black light absorbing material, including but not limited to a material such as black resin, black metal, black nonmetal (silicon), and the like. Thus, the proper angle can be selected to selectively transmit the film 104 according to the FOV requirement of the camera module 100.

When the angle selective transmission film 104 is disposed, referring to fig. 3, the angle selective transmission film 104 may have a light transmission angle θ t such that light having an incident angle greater than or equal to 0 ° and less than or equal to θ t can be transmitted, and light having an incident angle greater than θ t and less than or equal to 90 ° is blocked. In some embodiments of the present disclosure, the material of the angle selective transmission film 104 may be selected such that the angle selective transmission film 104 has a transmittance of 80% or more, for example 90%, 95%, or even 100% for light rays with an incident angle of 0 ° or more and θ t or less; in addition, the transmission of the angularly selective transmission film 104 is less than or equal to 10%, illustratively 5%, 3%, or even 1% or less, for light rays having an incident angle greater than θ t and less than or equal to 90 °. Thereby effectively improving the imaging quality of the camera module 100.

In addition, referring to fig. 4, when the light transmission angle θ t is selected according to the FOV of the camera module 100, in an exemplary embodiment, the light transmission angle θ t may be greater than or equal to the HFOV, so that all the light rays with the incident angle falling within the FOV of the camera module 100 can enter, thereby satisfying the imaging requirements of the camera module 100.

Optical image stabilization (optical image stabilization) is a technique for preventing or reducing instrument jitter occurring in the process of capturing an optical signal by setting optical components, such as the lens group 101, in an imaging instrument, thereby improving the imaging quality. In some embodiments of the present application, the optical anti-shake function may be integrated into the lens assembly 101, and when the light transmission angle θ t of the angular selective transmission film 104 is set, the anti-shake angle OIS _ angle of the lens assembly 101 needs to be considered, and in this case, the light transmission angle θ t of the angular selective transmission film 104 may be greater than or equal to the sum of HFOV + OIS _ angle. The influence on the light selective transmission caused by the shaking of the camera module is avoided, so that the camera module has better imaging quality.

In one possible embodiment of the present application, the angle selective transmission film 104 may be a film structure formed by stacking a plurality of dielectric films. Through the design of the film system, at least two dielectric films with different refractive indexes can be selected from the angle selective transmission film 104, and the thickness of each layer of dielectric film can be 50-200 nm, so that the selective transmission of light can be realized based on the principle that the multilayer dielectric films interfere the light.

In addition to the above-described arrangement, in another possible embodiment of the present application, the angularly selective permeable membrane 104 may be arranged using a randomized deep hole principle. The deep hole refers to a hole with a ratio of hole depth to hole diameter larger than 5 and smaller than 10. The randomized deep hole principle is a geometric optics principle, and light which does not meet the incident angle can only be projected on the side wall of the deep hole to be absorbed by adjusting the ratio of the hole depth and the aperture of the deep hole, so that the light cannot penetrate through the deep hole; and light meeting the requirement of the incident angle can directly penetrate through the deep hole. Therefore, according to the randomized deep hole principle, the light can be selectively formed by forming the deep hole in the angularly selective transmission film 104. Wherein, the ratio of the radius r of the deep hole to the hole depth H can satisfy: r/H is tan (θ t) so that light rays having an incident angle of greater than or equal to 0 ° and less than or equal to θ t can enter the camera module 100 through the deep hole.

In some embodiments of the present disclosure, in order to dispose the angle permselective film 104 in the camera module 100, the size of the angle permselective film 104 needs to be considered, and the thickness of the angle permselective film 104 is an important factor affecting the size of the camera module 100. Illustratively, the thickness h of the angularly selective transmission film 104 may be selected according to θ t: h is 0.1k/tan (θ t) mm, where k is a quality factor of the stray light, and may be greater than or equal to 0.5 and less than or equal to 1.5.

With reference to fig. 4, in the embodiment of the present application, when the image sensor 103 is disposed, the image sensor 103 is disposed at the image side of the lens group 101, light enters the camera module 100 through the lens group 101 and is focused on the image sensor 103, and the image sensor 103 accumulates corresponding charges according to the intensity of the light, so as to convert the light signal into an electrical signal. Then, the image sensor 103 converts the electric signals into digital signals by performing steps such as conversion, synthesis, compensation correction, and the like, and outputs the digital signals as images.

In some possible embodiments of the present application, the image sensor 103 may include an image processing chip, which may be used to process the electrical signal and output an image of the digital signal. In other embodiments, the image sensor 103 may not be provided with an image processing chip, but may integrate the function itself.

It is understood that the selection of the light entering the camera module 100 by the angle selective transmission film 104 actually selects the light focused on the image sensor 103, and therefore, the angle selective transmission film 104 is only required to be disposed on the side of the image sensor 103 facing the object side.

For example, referring to fig. 4, in a possible embodiment of the present application, the lens group 101 is disposed between the angle selective transparent film 104 and the image sensor 103, so as to select light rays before entering the lens group 101, so that light rays with an incident angle greater than or equal to 0 ° and smaller than or equal to θ t enter the camera module 100, thereby reducing stray light entering the camera module 100 from the source.

In a possible embodiment of the present application, referring to fig. 5, an angle selective transparent film 104 may be further disposed between the lens group 101 and the image sensor 103 to select light entering the image sensor 103, so that the light having an incident angle greater than or equal to 0 ° and smaller than or equal to θ t is focused on the image sensor 103, thereby reducing the influence of stray light on the imaging quality of the camera module 100.

In addition to the above structure, referring to fig. 4 or 5, the camera module 100 of the embodiment of the disclosure may further include an infrared filter 102, where the infrared filter 102 may be disposed between the lens assembly 101 and the image sensor 103.

Because the light reflected from the object surface includes visible light and infrared light, when the light enters the camera module 100 at the same time and is refracted by the lens group 101, the visible light and the infrared light will form images on different target surfaces, the visible light forms an image as a color image, and the infrared light forms an image as a black-and-white image. After the image formed by compressing the visible light is debugged, the infrared light forms a virtual image on the imaging target surface of the visible light, so that the imaging effect of the image is influenced. Therefore, by disposing the infrared filter 102 on the object side of the image sensor 103, the infrared light projected on the image sensor 103 can be effectively filtered, so as to improve the imaging effect of the camera module 100.

Referring to fig. 6, the camera module 100 of the present embodiment may further include a cover plate 105, where the cover plate 105 is disposed on an object side of other components such as the lens group 101, the angle selective transmission film 104, the infrared filter 102, and the image sensor 103 in the camera module 100, so as to protect the lens group 101, the angle selective transmission film 104, the infrared filter 102, and the image sensor 103 from water and dust. In addition, in order to improve the transmittance of light, the cover plate 105 may be made of a transparent material with high transmittance, and the cover plate 105 is exemplarily a glass cover plate. It is understood that the camera module 100 may further include a housing for accommodating the lens assembly 101, the angle-selective transparent film 104, the infrared filter 102, the image sensor 103, the cover plate 105, and other components.

With reference to fig. 6, in an embodiment of the present disclosure, the camera module 100 includes a cover plate 105, an angle selective transmission film 104, a lens group 101, an infrared filter 102, and an image sensor 103, which are sequentially disposed from an object side to an image side. Here, the angle selective transmission film 104 has a light transmission angle θ t, which is HFOV. In addition, for light rays with an incident angle of greater than or equal to 0 ° and less than or equal to θ t, the transmittance of the angle selective transmission film 104 is greater than 90%; for light rays having an angle range of incidence angles greater than or equal to θ t and less than or equal to 90 °, the transmittance of the angularly selective transmission film 104 is less than 1%. The HFOV of the camera module 100 in this embodiment is 10 °.

The stray light imaging simulation of the camera module 100 according to this embodiment is compared with that of the camera module 100 (hereinafter referred to as a comparison camera module 100) in which the angle selective transmission film 104 is not provided and other structural parameters are the same. First, fig. 7a and 7b are shown as simulation results, where fig. 7a is a simulation result of imaging in the camera module 100 when the incident angle of the light is 20 °, and fig. 7b is a simulation result of imaging in the camera module 100 according to the embodiment when the incident angle of the light is 20 °. It can be found by comparison that when the incident angle of the light is 20 °, the image of the camera module 100 has very obvious stray light, which is caused by the light outside the FOV entering the lens group 101 and being reflected inside, whereas in the camera module 100 of this embodiment, the angle-selective transparent film 104 has very good blocking effect on the stray light.

In addition, referring to fig. 7c and 7d, fig. 7c is a graph showing the simulation result of the imaging in the camera module 100 when the incident angle of the light is 30 °, and fig. 7d is a graph showing the simulation result of the imaging in the camera module 100 according to the embodiment when the incident angle of the light is 30 °. It can be found by comparison that when the incident angle of the light is 30 °, the image of the camera module 100 has very significant stray light, which is caused by the light outside the FOV entering the lens group 101 and being reflected inside, whereas in the camera module 100 of this embodiment, the angle-selective transparent film 104 has very good blocking effect on the stray light.

Therefore, in this embodiment of the application, through setting up the stray light that the angle selection sees through film 104 and can effectually reduce and enter into camera module 100 to can reduce the existence of dazzling light, it is favorable to promoting camera module 100's imaging quality.

Since the lens assembly 101 of the camera module 100 can be a periscopic type in addition to a vertical type, the structure of the camera module 100 including the periscopic type lens assembly 101 is relatively complex compared with the vertical type lens assembly 101. Referring to fig. 8, in one possible embodiment of the present application, when the lens assembly 101 is of the periscopic type, the camera module 100 may be specifically configured as a cover plate 105 arranged in sequence from the object side to the image side, followed by an angle selective transparent film 104, and then the lens assembly 101, the lens assembly 101 includes an optical element (e.g. a prism 1011) for changing the light transmission path, and a horizontal lens assembly 1012 composed of a plurality of lenses and disposed at the image side of the prism 1011, wherein the number of lenses in the horizontal lens assembly 1012 may be 3-8, which may be selected according to actual design requirements. On the image side of the horizontal lens component 1012 is the infrared filter 102 and finally the image sensor 103. In this embodiment, the angle selective transparent film 104 can be set by referring to the above embodiments, which will not be described herein. It is understood that, in the present embodiment, if the optical anti-shake module is present, the light transmission angle θ t of the angle selection film may be set to be greater than or equal to the sum of HFOV + OIS _ angle, where OIS _ angle is the angle of optical anti-shake.

In addition, for the structure of the camera module 100 including the periscopic lens set 101, referring to fig. 9, the angle selective transmission film 104 may also be disposed between the prism 1011 and the horizontal lens component 1012, which can also prevent stray light from entering the lens set 101. In addition, in some embodiments, the angularly selective transparent film 104 may be placed between the horizontal lens component 1012 and the image sensor 103.

Taking the FOV of the camera module 100 as 12 °, the camera module 100 of this embodiment is compared with the stray light imaging simulation of the camera module 100 (hereinafter referred to as a comparison camera module 100) which is not provided with the angle selective transmission film 104 and has the same other structural parameters. First, the simulation results can be referred to fig. 10a and 10b, where fig. 10a is the simulation result of the imaging in the comparative camera module 100 when the incident angle of the light is 20 °, and fig. 10b is the simulation result of the imaging in the camera module 100 according to the embodiment when the incident angle of the light is 20 °. It can be seen from comparison that, when the incident angle of the light is 20 °, although the incident angle (20 °) of the light is much larger than that of the HFOV (6 °), a very significant flare occurs in the middle of the image of the comparison camera module 100. However, there is very little flare light in the middle of the image of the camera module 100 in this embodiment, and even the whole image is completely black, so the angle selective transmission film 104 has a good blocking effect on the flare light.

In addition, referring to fig. 10c and 10d, fig. 10c is a graph showing the simulation result of the imaging in the camera module 100 when the incident angle of the light is 25 °, and fig. 10d is a graph showing the simulation result of the imaging in the camera module 100 according to the embodiment when the incident angle of the light is 25 °. It can be found by comparison that when the light incidence angle is 25 °, although the light incidence angle (25 °) is much larger than the HFOV (6 °), a very significant glare appears in the middle of the image of the comparison camera module 100. However, there is very little flare light in the middle of the image of the camera module 100 in this embodiment, and even the whole image is completely black, so the angle selective transmission film 104 has a good blocking effect on the flare light.

Fig. 10e and 10f may also be referred to, where fig. 10e is a simulation result of comparing the images in the camera module 100 when the incident angle of the light is 30 °, and fig. 10f is a simulation result of comparing the images in the camera module 100 according to the embodiment when the incident angle of the light is 30 °. It can be found by comparison that when the incident angle of the light is 30 °, although the incident angle (30 °) of the light is much larger than that of the HFOV (6 °), a very significant flare occurs in the middle of the image of the comparison camera module 100. However, there is very little flare light in the middle of the image of the camera module 100 in this embodiment, and even the whole image is completely black, so the angle selective transmission film 104 has a good blocking effect on the flare light.

In this embodiment of this application, can effectually reduce the stray light that enters into camera module 100 through setting up angle selection and permeating film 104 to can reduce the existence of dazzling light, it is favorable to promoting camera module 100's imaging quality.

Referring to fig. 11, in other embodiments of the present invention, an upright lens subgroup 101a and a periscopic lens subgroup 101b may be disposed in the camera module 100. When the camera module 100 is specifically configured, the camera module may include a cover plate 105, an angle selective transmission film 104, a first infrared filter 102a and a first image sensor 103a that are disposed corresponding to the vertical lens sub-group 101a, and a prism 1011, a horizontal lens assembly 1012, a second infrared filter 102b and a second image sensor 103b that are disposed corresponding to the periscopic lens sub-group 101 b. The angle selective transmission film 104 is disposed on the image side of the cover plate 105, the vertical lens subgroup 101a is disposed on the image side of the angle selective transmission film 104, and the vertical lens subgroup 101a, the first infrared filter 102a and the first image sensor 103a are sequentially arranged from the object side to the image side. The prism 1011 is disposed on the image side of the angle selective transmission film 104, the horizontal lens unit 1012 is disposed on the image side of the prism 1011, and the periscopic lens sub-group 101b, the second infrared filter 102b and the second image sensor 103b are arranged in order from the object side to the image side.

In this embodiment, the vertical lens subgroup 101a has a field angle FOV1, the periscopic lens subgroup 101b has a field angle FOV2, the vertical lens subgroup 101a has an optical anti-shake angle OIS _ angle1, and the periscopic lens subgroup 101b has an optical anti-shake angle OIS _ angle 2. Based on the optical parameters of the

lens groups

101a and 101b, the light transmittance of the angle selective transmission film 104 can be designed in different zones, see fig. 12, in which the area a1 corresponds to the vertical lens subgroup 101a, and the light transmittance θ t _1 is HFOV1+ OIS _ angle 1; the area a2 corresponds to the periscopic lens subgroup 101b, and its light transmittance θ t _2 is HFOV2+ OIS _ angle 2; thus, the angle transmission film can respectively control the stray light of the two lens subgroups.

In this embodiment, the structure of the camera module can be effectively simplified by placing an angle selective transmission film 104 on the object side of the vertical lens group 101a and the periscopic lens group 101 b. In addition, the angle selective transmission film 104 can simultaneously control the angles of the light beams of the vertical lens group 101a and the periscopic lens group 101b, thereby reducing the stray light of the whole camera module 100.

In other embodiments, referring to fig. 13, an angle selective transmission film may be disposed corresponding to the vertical lens sub-group 101a and the periscopic lens sub-group 101 b. At this time, the angle permselective film 104a corresponding to the vertical lens subset 101a is disposed between the cover plate 105 and the vertical lens subset 101a, and the angle permselective film 104b corresponding to the periscopic lens subset 101b is disposed between the prism 1011 and the lens assembly 1012. In other embodiments, when an angle selective transmission film 104a and an angle selective transmission film 104b are respectively disposed corresponding to the upright lens subset 101a and the periscopic lens subset 101b, the disposition position of each angle selective transmission film can be adjusted, for example, the angle selective transmission film 104a is disposed between the upright lens subset 101a and the first infrared filter 102 a; the angle selective transmission film 104b is disposed between the horizontal lens component 1012 and the second infrared filter 102b, as long as it is disposed on the object side of the

image sensor

103a or 103b to reduce stray light from participating in imaging.

Referring to fig. 14, an embodiment of the present application further provides an electronic device 200, where the electronic device 200 may be a common terminal in the prior art, such as a mobile phone, a tablet computer, or a notebook computer. The electronic device 200 may include a housing 201 and the camera module 100 in any of the foregoing embodiments, and the camera module 100 may be disposed in the housing 201 for implementing a shooting function of the electronic device 200.

The film is selectively penetrated through the setting angle in the camera module 100 of the electronic device 200, so that light participating in imaging enters the camera module 100, and stray light not participating in imaging is prevented from entering, the imaging effect of the camera module 100 can be effectively improved, and the use feeling of a user on the electronic device 200 is further improved.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a camera module which characterized in that, includes lens group, image sensor and angle selection and sees through the film, wherein:

the lens group comprises a plurality of lenses arranged from the object side to the image side;

the image sensor is arranged on the image side of the lens group;

the angle selective transmission film is arranged on the object side of the image sensor, is used for transmitting incident light rays with an incident angle larger than or equal to 0 degrees and smaller than or equal to thetat and blocking the incident light rays with an incident angle larger than thetat and smaller than or equal to 90 degrees, and is larger than or equal to 0 degrees and smaller than 90 degrees.

2. The camera module of claim 1, wherein the thickness h of the angularly permselective film satisfies: h is 0.1k/tan (θ t) mm, where k is a quality factor of stray light, and a value of k is greater than or equal to 0.5 and less than or equal to 1.5.

3. The camera module of claim 1 or 2, wherein θ t is greater than or equal to a half field angle of the set of mirrors.

4. The camera module of claim 3, wherein the lens assembly has an anti-shake angle, and the light transmission angle θ t is greater than or equal to a sum of a half field angle and the anti-shake angle of the lens assembly.

5. The camera module of any of claims 1-4, wherein for light rays having an incident angle greater than or equal to 0 ° and less than or equal to θ t, the transmittance of the angle selective transmission film is greater than or equal to 80%; the angle selective transmission film has a transmittance of 10% or less for light rays having an incident angle θ t or more and 90 ° or less.

6. The camera module of any of claims 1-5, wherein the angle selective transmission film comprises a plurality of dielectric films, at least two of the dielectric films having different optical refractive indices.

7. The camera module of claim 6, wherein the thickness of each dielectric film is greater than or equal to 50nm and less than or equal to 200 nm.

8. The camera module according to any one of claims 1 to 5, wherein the angle permselective membrane is provided with a deep hole, and a ratio of a radius r of the deep hole to a hole depth H of the deep hole satisfies: r/H is tan (θ t).

9. The camera module of any of claims 1-8, wherein the angularly selective transparent film is disposed on an object side of the lens assembly; alternatively, the angle selective transmission film is disposed between the lens group and the image sensor.

10. The camera module of any of claims 1-8, further comprising an infrared filter disposed between the lens assembly and the image sensor, wherein the angularly selective transparent film is disposed between the lens assembly and the infrared filter.

11. The camera module of any of claims 1-10, wherein the lens assembly is an upright lens assembly or the lens assembly is a periscopic lens assembly.

12. The camera module of any of claims 1-8, wherein the lens assembly is a combination of an upright lens assembly and a periscopic lens assembly,

the angle selective transmission film is provided with a first area corresponding to the vertical lens subgroup and a second area corresponding to the periscopic lens subgroup.

13. The camera module of any of claims 1-8, wherein the lens group is a combination of an upright lens subgroup and a periscopic lens subgroup, and the number of the angularly selective transmission films is two, one of the angularly selective transmission films corresponds to the upright lens subgroup and the other of the angularly selective transmission films corresponds to the periscopic lens subgroup.

14. The camera module of claim 13, wherein the angle selective transparent film corresponding to the upright lens set is disposed on an object side of the upright lens set, or disposed between the upright lens set and the first image sensor corresponding to the upright lens set.

15. The camera module of claim 14, further comprising a first infrared filter corresponding to the upright lens set, the first infrared filter being disposed between the upright lens set and the first image sensor, and an angle-selective transparent film corresponding to the upright lens set being disposed between the upright lens set and the first infrared filter.

16. The camera module of claim 13, wherein the periscopic lens subgroup comprises an optical component and a horizontal lens component for changing a light transmission path, and an angle selective transmission film corresponding to the periscopic lens subgroup is disposed between the optical component and the horizontal lens component, or disposed between the horizontal lens component and a second image sensor corresponding to the periscopic lens subgroup.

17. The camera module of claim 16, further comprising a second ir filter corresponding to the periscopic lens subset, the second ir filter disposed between the horizontal lens assembly and the second image sensor, and an angularly selective transparent film corresponding to the periscopic lens subset disposed between the horizontal lens assembly and the second ir filter.

18. The camera module of any one of claims 1-17, further comprising a cover plate disposed on an object side of other components in the camera module.

19. The camera module of any of claims 1-18, wherein the selectively angularly transparent film is made of a black resin, a black metal, or a black non-metallic material.

20. An electronic device, comprising a housing and the camera module according to any one of claims 1 to 19, wherein the camera module is disposed in the housing.