Camera module and electronic equipment

Abstract

The present application provides a camera module and electronic equipment, which relate to the technical field of electronic equipment. The camera module includes a lens group, an image sensor, and an angle-selective transmission film, wherein: the lens group includes 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, and the angle-selective transmission film is used to transmit incident light with an incident angle greater than or equal to 0° and less than or equal to θt; and to block incident light with an incident angle greater than θt and less than or equal to 90° from entering the camera module. In an embodiment of the present application, the angle-selective transmission film can select light with different incident angles, so that light that meets the incident angle requirements can enter the camera module to participate in imaging, while blocking light that does not meet the incident requirements, thereby effectively improving the imaging effect of the camera module.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a camera module and electronic equipment. Background Art

[0002] With the development of technology, users have higher and higher requirements for the photo quality of mobile phone lenses. Glare and ghosting, as key factors affecting lens imaging quality, are problems that technicians in this field need to overcome during the lens development process.

[0003] Currently, to overcome this problem, stray light is typically reduced by adjusting the lens design or by blackening the non-transparent areas of the lens. However, these traditional treatments significantly impact the light within the field of view (FOV) used for imaging, but are less effective at eliminating stray light outside the FOV. This results in stray light entering the lens and affecting imaging.

[0004] In many scenarios, in order to avoid glare caused by light outside the FOV range, the lens design becomes complicated, such as increasing the complexity of the structure; it may even be necessary to sacrifice some other optical properties, such as reducing the aperture. Summary of the Invention

[0005] The present application provides a camera module and electronic equipment to effectively reduce glare caused by light within the FOV range and improve the imaging quality of the camera module.

[0006] In a first aspect, the present application provides a camera module, which may include a lens group, an image sensor, and an angle-selective transmission film. The lens group includes a plurality of lenses arranged in sequence from the object side to the image side, and the lenses may be lenses or non-lenses. The image sensor is arranged on the image side of the lens group, and is used to receive light transmitted through the lens group and form an image. The angle-selective transmission film is arranged on the object side of the image sensor, and is used to transmit incident light with an incident angle greater than or equal to 0° and less than or equal to θt, and is used to block incident light with an incident angle greater than θt and less than or equal to 90° from entering the camera module, where θt is greater than or equal to 0° and less than 90°. In an embodiment of the present application, by arranging the angle-selective transmission film on the object side of the image sensor, the angle-selective transmission film can select light with different incident angles, so that light that meets the incident angle requirements can enter the camera module to participate in imaging, while blocking light that does not meet the incident requirements, thereby effectively improving the imaging effect of the camera module.

[0007] The angle-selective transmission film can block light that does not meet the incident requirements by reflecting or absorbing it, which can be achieved by adjusting the material of the angle-selective transmission film. In one possible implementation of the present application, the angle-selective transmission film can be made of a black light-absorbing material, including but not limited to black resin, ferrous metal, black non-metal (silicon), and the like. In this way, the appropriate angle-selective transmission film can be selected based on the camera module's FOV requirements.

[0008] Furthermore, the transmittance of the angle-selective transmission film can be adjusted by selecting the material of the film. For example, for light with an incident angle greater than or equal to 0° and less than or equal to θt, the transmittance of the angle-selective transmission film can be greater than or equal to 80%, and exemplary examples are 90%, 95%, or even 100%. Furthermore, for light with an incident angle greater than θt and less than or equal to 90°, the transmittance of the angle-selective transmission film can be less than or equal to 10%, and exemplary examples are 5%, 3%, or even less than 1%. This effectively improves the imaging quality of the camera module.

[0009] In one possible implementation of the present application, when configuring the angle-selective transmission film, the film's thickness is also a key factor influencing light transmission. The thickness can be selected based on the desired amount of stray light blocked and the value of θt. For example, the film's thickness h can satisfy the following equation: h = 0.1k / tan(θt) mm, where k is the stray light quality factor and is greater than or equal to 0.5 and less than or equal to 1.5. This effectively blocks stray light.

[0010] In one possible implementation of the present application, the angle-selective transmission film may be formed by stacking multiple layers of dielectric films, at least two of which have different refractive indices, and each layer may be 50 to 200 nm thick. This allows the angle-selective transmission film to selectively transmit light based on the principle of light interference caused by the multiple layers of dielectric films.

[0011] In one possible implementation of the present application, the angle-selective transmission film can also be a single-layer film structure, and this single-layer film structure can be provided with deep holes according to the randomized deep hole principle. By adjusting the ratio of the hole depth to the hole diameter, light that does not meet the incident angle requirement can only be projected onto the sidewalls of the deep hole and absorbed, thus being unable to pass through the deep hole; while light that meets the incident angle requirement can directly pass through the deep hole, thereby achieving light selection. The ratio of the radius r of the deep hole in the angle-selective transmission film to the hole depth H can satisfy: r / H = tan(θt), so that light with an incident angle greater than or equal to 0° and less than or equal to θt can pass through the deep hole and enter the camera module.

[0012] Since the field of view angle of the lens group determines the field of view range of the camera module, θt can be made greater than or equal to the half field of view angle of the lens group, so that the incident light within the field of view angle range can pass through the film selectively through the angle to participate in imaging.

[0013] In one possible implementation of the present application, an optical image stabilization function may be integrated into the lens assembly. In this case, when setting the light transmission angle θt of the angle-selective transmission film, the lens assembly's image stabilization angle OIS_angle needs to be considered. In this case, the light transmission angle θt of the angle-selective transmission film can be greater than or equal to the sum of HFOV + OIS_angle. This prevents camera module jitter from affecting the selective transmission of light, thereby ensuring better imaging quality.

[0014] In one possible implementation of the present application, when the angle-selective transmission film is disposed within the camera module, it can be positioned on the object side of the lens assembly. Alternatively, the angle-selective transmission film can be positioned between the lens assembly and the image sensor. Any method capable of selecting the light projected onto the image sensor for imaging is sufficient.

[0015] In one possible implementation of the present application, since the light reflected from the surface of an object includes both visible light and infrared light, when these rays simultaneously enter the camera module, the infrared light will affect the imaging of the visible light. Thus, the camera module can also include an infrared filter, which can be disposed between the lens assembly and the image sensor to effectively filter out the infrared light projected onto the image sensor, thereby improving the imaging effect of the camera module. Furthermore, in this implementation, an angle-selective transmission film can be disposed between the lens assembly and the infrared filter to select the light incident on the camera module.

[0016] In a possible implementation of the present application, the lens group of the camera module can be an upright lens group or a periscope lens group. When the lens group is an upright lens group or a periscope lens group, the angle-selective transmission film can be arranged on the object side of the lens group, or between the lens group and the image sensor.

[0017] In another possible implementation of the present application, the lens assembly can also be a combination of an upright lens sub-assembly and a periscope lens sub-assembly. In this case, when configuring the angle-selective transmission film, a single film can be provided, having a first region corresponding to the upright lens sub-assembly and a second region corresponding to the periscope lens sub-assembly. This configuration effectively simplifies the structure of the camera module. Furthermore, the angle-selective transmission film can simultaneously control the angle of light from both the upright lens sub-assembly and the periscope lens sub-assembly, thereby reducing stray light from the entire camera module.

[0018] Furthermore, when the lens assembly comprises a combination of an upright lens sub-assembly and a periscope lens sub-assembly, the camera module may also be provided with an angle selective transmission film corresponding to each of the upright lens sub-assembly and the periscope lens sub-assembly. The angle selective transmission film corresponding to the upright lens sub-assembly is disposed on the object side of the upright lens sub-assembly, or between the upright lens sub-assembly and the first image sensor corresponding to the upright lens sub-assembly.

[0019] The camera module may also include a first infrared filter corresponding to the upright lens sub-group, the first infrared filter is arranged between the upright lens sub-group and the first image sensor, and the angle-selective transmission film corresponding to the upright lens sub-group may also be arranged between the upright lens sub-group and the first infrared filter.

[0020] In another possible implementation of the present application, the periscope lens subgroup may include an optical component and a horizontal lens component for changing the light transmission path, and the angle-selective transmission film corresponding to the periscope lens subgroup may also be arranged between the optical component and the horizontal lens component, or, between the horizontal lens component and the second image sensor corresponding to the periscope lens subgroup.

[0021] In addition, the camera module may also include a second infrared filter corresponding to the periscope lens sub-group. The second infrared filter can be arranged between the horizontal lens assembly and the second image sensor, and the angle-selective transparent film corresponding to the periscope lens sub-group can be arranged between the horizontal lens assembly and the second infrared filter.

[0022] In addition to the above structure, in one possible implementation of the present application, the camera module may further include a cover plate. This cover plate may be disposed on the object side of other components within the camera module, such as the lens assembly, angle-selective transmission film 1, infrared filter, and image sensor, to provide waterproof and dustproof protection for the lens assembly, angle-selective transmission film, infrared filter, and image sensor. Furthermore, the cover plate may be, but is not limited to, a plate-like structure made of a transparent material such as glass to improve light transmittance.

[0023] In a second aspect, the present application further provides an electronic device comprising a housing and a camera module according to the embodiment of the first aspect, wherein the camera module may be disposed within the housing. The camera module of the electronic device selectively transmits a thin film at an angle to allow light that participates in imaging to enter the camera module while blocking stray light that does not participate in imaging. This effectively improves the imaging effect of the camera module and, in turn, enhances the user experience of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a camera module provided in one embodiment of the present application;

[0025] Figure 2 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0026] Figure 3 A light transmittance curve diagram of an angle selective transmission film provided in one embodiment of the present application;

[0027] Figure 4 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0028] Figure 5 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0029] Figure 6 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0030] Figure 7a-7d A comparison chart of imaging simulation results of the camera module of the embodiment of the present application and a comparative camera module;

[0031] Figure 8 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0032] Figure 9 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0033] Figure 10a-10f A comparison chart of imaging simulation results of the camera module of the embodiment of the present application and a comparative camera module;

[0034] Figure 11 A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0035] Figure 12 A schematic structural diagram of an angle selective transmission film provided in one embodiment of the present application;

[0036] Figure 13A schematic structural diagram of a camera module provided in another embodiment of the present application;

[0037] Figure 14 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0038] To facilitate understanding of the camera module provided in the embodiments of the present application, the application scenarios of the camera module in the embodiments of the present application are first introduced. The camera module can be, but is not limited to, provided in electronic devices such as mobile phones, tablet computers, laptop computers, or personal digital assistants (PDAs) to realize the image capture function of the electronic devices.

[0039] Reference Figure 1 The camera module 100 generally includes 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. Generally speaking, the light entering the lens group 101 can be divided into two parts. One part is the light participating in the imaging (such as the infrared filter 102). Figure 1 The solid line in the figure represents the light), and some of the light does not participate in the imaging (such as Figure 1 (The light rays represented by the dashed lines in the middle) Light rays that contribute to imaging converge on the surface of image sensor 103 after passing through lens assembly 101, thereby forming an image. Light rays that do not contribute to imaging may, while passing through lens assembly 101, be projected onto the edges of lenses in lens assembly 101 or other locations, causing abnormal reflections. These rays then form an image after reaching image sensor 103, resulting in flare and ghosting.

[0040] In optical instruments, the angle between the two edges of the lens, with the lens as the vertex, and the maximum range through which the image of the object being measured can pass through the lens, is called the field of view (FOV). The incident angle is the angle between the incident light and the normal of the incident surface.

[0041] 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 involved in the imaging are all less than or equal to the half field of view (HFOV) of the lens assembly 101. Light rays outside the FOV range (hereinafter referred to as stray light) generally do not participate in the imaging and may also form glare and ghosting, thereby affecting the imaging quality of the camera module 100.

[0042] To improve the imaging quality of camera modules, it's necessary to reduce stray light. Currently, this is often achieved by adjusting the structural design of lens assembly 101 or by fogging or blackening the non-transparent areas of the lens assembly 101. In some scenarios, preventing glare caused by light outside the FOV complicates the lens design; in other scenarios, it even requires sacrificing other optical properties, such as reducing the aperture.

[0043] The camera module 100 provided in the embodiment of the present application is intended 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 .

[0044] Reference Figure 2 The camera module 100 provided in the embodiment of the present application may include a lens assembly 101, an angle selective transmission film 104, and an image sensor 103. The lens assembly 101, as an important component of the camera module 100, mainly focuses on the principles of light refraction and reflection to converge light reflected from an object. It is understood that in the embodiment of the present application, the lens assembly 101 may be, but is not limited to, a combination of upright lens sub-groups (e.g., a combination of at least two upright lens sub-groups), or a combination of periscope lens sub-groups (e.g., a combination of at least two periscope lens sub-groups), or a combination of upright lens sub-groups and periscope lens sub-groups (e.g., a combination of at least one upright lens sub-group and at least one periscope lens sub-group).

[0045] To achieve its function, lens assembly 101 typically includes multiple lenses, which may be designed spherical or aspherical lenses. These lenses may be arranged sequentially from the object side to the image side of camera module 100. For example, lens assembly 101 may include 3 to 8 lenses, which may be selected based on the specific design requirements of camera module 100. Furthermore, the lenses may be made of, but are not limited to, transparent materials such as glass or plastic to facilitate light transmission.

[0046] In order to improve the imaging effect of the camera module 100, we usually hope to increase the light entering the lens group 101 and with an incident angle within the FOV range of the lens group 101 to enter the camera module 100 to participate in imaging, while reducing the entry of light outside the FOV range.

[0047] In the embodiment of the present application, the angle selective transmission film 104 can select light of different incident angles, so that light that meets the incident angle requirement can pass through, while blocking light that does not meet the incident requirement. Among them, the angle selective transmission film 104 can block light that does not meet the incident requirement by reflecting or absorbing the light, etc., which can be achieved by the material of the angle selective transmission film 104. Exemplarily, the angle selective transmission film 104 can be a black light-absorbing material, including but not limited to black resin, black metal, black non-metal (silicon), etc. In this way, a suitable angle selective transmission film 104 can be selected according to the FOV requirement of the camera module 100.

[0048] When setting the angle selective transmission film 104, refer to Figure 3 The angle selective transmission film 104 can have a light transmission angle θt, so that light with an incident angle greater than or equal to 0° and less than or equal to θt can be transmitted, while light with an incident angle greater than θt and less than or equal to 90° is blocked. In some embodiments of the present application, the material of the angle selective transmission film 104 can be selected so that the transmittance of the angle selective transmission film 104 for light with an incident angle greater than or equal to 0° and less than or equal to θt is greater than or equal to 80%, and exemplarily 90%, 95%, or even 100%. In addition, the transmittance of the angle selective transmission film 104 for light with an incident angle greater than θt and less than or equal to 90° is less than or equal to 10%, and exemplarily 5%, 3%, or even less than 1%. This effectively improves the imaging quality of the camera module 100.

[0049] In addition, refer to Figure 4 When the light transmission angle θt is selected according to the FOV of the camera module 100, in an exemplary embodiment, the light transmission angle θt can be greater than or equal to HFOV, so that all light with an incident angle falling within the FOV range of the camera module 100 can enter, thereby meeting the imaging requirements of the camera module 100.

[0050] Optical image stabilization (OIS) refers to the use of optical components, such as lens assembly 101, in imaging instruments to avoid or reduce instrument jitter during the capture of optical signals, thereby improving image quality. In some embodiments of the present application, the lens assembly 101 may also be integrated with an OIS function. In this case, when setting the light transmission angle θt of the angle-selective transmission film 104, the stabilization angle OIS_angle of the lens assembly 101 needs to be considered. In this case, the light transmission angle θt of the angle-selective transmission film 104 can be greater than or equal to the sum of HFOV + OIS_angle. This prevents camera module jitter from affecting the selective transmission of light, thereby ensuring better imaging quality.

[0051] In one possible embodiment of the present application, the angle-selective transmission film 104 can be constructed by stacking multiple dielectric films. Through film design, the angle-selective transmission film 104 can be constructed from at least two dielectric films with different refractive indices, with each dielectric film layer having a thickness of 50 to 200 nm. This allows for selective light transmission based on the principle of light interference caused by the multiple dielectric films.

[0052] In addition to the above-mentioned setting method, in another possible embodiment of the present application, the angle selective transmission film 104 can also be set using the randomized deep hole principle. Among them, a deep hole refers to a hole with a ratio of hole depth to hole diameter greater than 5 and less than 10. The randomized deep hole principle is a geometric optical principle, which can adjust the ratio of the hole depth and hole diameter of the deep hole so that light that does not meet the incident angle can only be projected on the side wall of the deep hole and absorbed, and thus cannot pass through the deep hole; while light that meets the incident angle requirements can directly pass through the deep hole. Therefore, according to the randomized deep hole principle, deep holes can be opened on the angle selective transmission film 104 to achieve the selection of light. Among them, the ratio of the radius r of the deep hole to the hole depth H can satisfy: r / H=

[0053] tan(θt), so that light with an incident angle greater than or equal to 0° and less than or equal to θt can enter the camera module 100 through the deep hole.

[0054] In some embodiments of the present application, the size of the angle-selective transmission film 104 must be considered in order to be installed in the camera module 100. The thickness of the angle-selective transmission film 104 is a significant factor affecting the size of the camera module 100. For example, the thickness h of the angle-selective transmission film 104 can be selected based on θt: h = 0.1k / tan(θt) mm, where k is the quality factor for stray light and can be greater than or equal to 0.5 and less than or equal to 1.5.

[0055] Continue to refer to Figure 4 In this embodiment, image sensor 103 is positioned on the image side of lens assembly 101. Light passes through lens assembly 101 and enters camera module 100, where it is focused onto image sensor 103. Image sensor 103 accumulates charge based on the intensity of the light, converting the optical signal into an electrical signal. Image sensor 103 then converts, synthesizes, and compensates the electrical signal, converting it into a digital signal for image output.

[0056] In some possible embodiments of the present application, the image sensor 103 may include an image processing chip that can be used to process the electrical signal and output a digital signal image. In other embodiments, the image sensor 103 may not be provided with an image processing chip, but may integrate this function itself.

[0057] It is understandable that the angle selective transparent film 104 selects the light entering the camera module 100, which is actually the light focused on the image sensor 103. Therefore, it is sufficient to set the angle selective transparent film 104 on the side of the image sensor 103 facing the object side.

[0058] For example, refer to Figure 4 In a possible embodiment of the present application, the lens group 101 is arranged between the angle-selective transmission film 104 and the image sensor 103 to select the light before entering the lens group 101, so that the light with an incident angle greater than or equal to 0° and less than or equal to θt enters the camera module 100, thereby reducing the stray light entering the camera module 100 at the source.

[0059] In a possible embodiment of the present application, refer to Figure 5 , the angle selective transmission film 104 can also be set between the lens group 101 and the image sensor 103 to select the light before entering the image sensor 103, so that the light with an incident angle greater than or equal to 0° and less than or equal to θt is focused on the image sensor 103, thereby reducing the impact of stray light on the imaging quality of the camera module 100.

[0060] In addition to the above structure, refer to Figure 4 or Figure 5 The camera module 100 of the embodiment of the present application may further include an infrared filter 102 , which may be disposed between the lens group 101 and the image sensor 103 .

[0061] Since the light reflected from the surface of an object includes visible light and infrared light, when these light rays simultaneously enter the camera module 100 and are refracted by the lens assembly 101, the visible light and infrared light will form images on different target surfaces, with the visible light image forming a color image and the infrared light image forming a black and white image. After the image formed by the visible light is adjusted, the infrared light will form a virtual image on the visible light imaging target surface, thereby affecting the imaging effect of the image. Therefore, by providing an infrared filter 102 on the object side of the image sensor 103, the infrared light projected onto the image sensor 103 can be effectively filtered out, thereby improving the imaging effect of the camera module 100.

[0062] Reference Figure 6 The camera module 100 of the embodiment of the present application may further include a cover plate 105, which is disposed on the 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 to provide waterproof and dustproof protection for the lens group 101, the angle-selective transmission film 104, the infrared filter 102, and the image sensor 103. In addition, in order to improve the transmittance of light, the cover plate 105 may be made of a transparent material with a high light transmittance. For example, the cover plate 105 is a glass cover plate. It is understandable that the camera module 100 may also generally include a housing for accommodating components such as the lens group 101, the angle-selective transmission film 104, the infrared filter 102, the image sensor 103, and the cover plate 105.

[0063] Continue to refer to Figure 6 In a specific embodiment of the present application, 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 arranged in sequence from the object side to the image side. The light transmission angle θt of the angle selective transmission film 104 is θt = HFOV. In addition, for light with an incident angle range of greater than or equal to 0° and less than or equal to θt, the transmittance of the angle selective transmission film 104 is greater than 90%; for light with an incident angle range of greater than or equal to θt and less than or equal to 90°, the transmittance of the angle selective transmission film 104 is less than 1%. In this embodiment, the HFOV of the camera module 100 is = 10°.

[0064] The stray light imaging simulation of the camera module 100 of this embodiment is compared with that of a camera module 100 without the angle selective transmission film 104 and with the same other structural parameters (hereinafter referred to as the comparative camera module 100). First, the simulation results can be referred to Figure 7a and Figure 7b ,in, Figure 7aWhen the incident angle of the light is 20°, the imaging simulation results in the camera module 100 are compared. Figure 7b Figure 1 shows the imaging simulation results of the camera module 100 of this embodiment when the incident angle of light is 20°. By comparison, it can be seen that when the incident angle of light is 20°, the imaging image of the comparative camera module 100 has very obvious stray light. The source of this stray light is the result of light outside the FOV entering the lens assembly 101 and reflecting inside. In contrast, the camera module 100 of this embodiment has very little stray light, indicating that the angle-selective transmission film 104 effectively blocks stray light.

[0065] In addition, refer to Figure 7c and Figure 7d ,in, Figure 7c When the incident angle of the light is 30°, the imaging simulation results in the camera module 100 are compared. Figure 7d Figure 1 shows the imaging simulation results of the camera module 100 of this embodiment when the incident angle of light is 30°. Comparison shows that when the incident angle is 30°, the imaging image of the comparative camera module 100 exhibits significant stray light. This stray light originates from light outside the FOV entering the lens assembly 101 and reflecting off it. However, the camera module 100 of this embodiment exhibits very little stray light, indicating that the angle-selective transmission film 104 effectively blocks stray light.

[0066] Therefore, in the embodiment of the present application, by setting the angle selective transmission film 104, the stray light entering the camera module 100 can be effectively reduced, thereby reducing the presence of glare, which is beneficial to improving the imaging quality of the camera module 100.

[0067] Since the lens group 101 in the camera module 100 can be not only upright but also periscope, the structure of the camera module 100 including the periscope lens group 101 is relatively complex compared with the upright lens group 101. Figure 8In one possible embodiment of the present application, when the lens assembly 101 is a periscope type, the camera module 100 can be specifically configured as a cover plate 105 arranged in sequence from the object side to the image side, followed by an angle selective transmission film 104, and then the lens assembly 101. The lens assembly 101 includes an optical component (such as a prism 1011) for changing the light transmission path, and a horizontal lens assembly 1012 composed of multiple lenses arranged on the image side of the prism 1011. The number of lenses in the horizontal lens assembly 1012 can be 3-8, which can be selected according to actual design requirements. On the image side of the horizontal lens assembly 1012 is the infrared filter 102, and finally the image sensor 103. In this embodiment, the angle selective transmission film 104 can be configured with reference to the above embodiment and will not be described in detail here. It is understandable that in this embodiment, if an optical image stabilization module is present, the light transmission angle θt of the angle selection film can be set to be greater than or equal to the sum of HFOV+OIS_angle, where OIS_angle is the optical image stabilization angle.

[0068] In addition, for the camera module 100 architecture including the periscope lens group 101, refer to Figure 9 The angle selective transmission film 104 can also be placed between the prism 1011 and the horizontal lens assembly 1012, which can also prevent stray light from entering the lens assembly 101. In addition, in some embodiments, the angle selective transmission film 104 can also be placed between the horizontal lens assembly 1012 and the image sensor 103.

[0069] Taking the camera module 100 with FOV=12° as an example, the stray light imaging simulation of the camera module 100 of this embodiment is compared with that of a camera module 100 without the angle selective transmission film 104 and with the same other structural parameters (hereinafter referred to as the comparative camera module 100). First, the simulation results can be referred to Figure 10a and Figure 10b ,in, Figure 10a When the incident angle of the light is 20°, the imaging simulation results in the camera module 100 are compared. Figure 10b The following are the imaging simulation results for the camera module 100 of this embodiment when the incident angle of light is 20°. A comparison reveals that, at a 20° incident angle, although the incident angle (20°) is significantly greater than the HFOV (6°), significant glare appears in the center of the image captured by the comparison camera module 100. However, the image captured by the camera module 100 of this embodiment exhibits very little glare in the center, with the entire image appearing completely black. This demonstrates that the angle-selective transmission film 104 effectively blocks stray light.

[0070] In addition, refer to Figure 10c and Figure 10d ,in, Figure 10c When the incident angle of the light is 25°, the imaging simulation results in the camera module 100 are compared. Figure 10d The following are the imaging simulation results for the camera module 100 of this embodiment when the incident angle of light is 25°. A comparison reveals that, at a 25° incident angle, although the incident angle (25°) is significantly greater than the HFOV (6°), significant glare appears in the center of the image captured by the comparison camera module 100. In contrast, the image captured by the camera module 100 of this embodiment exhibits very little glare in the center, with the entire image appearing completely black. This demonstrates that the angle-selective transmission film 104 effectively blocks stray light.

[0071] You can also refer to Figure 10e and Figure 10f ,in, Figure 10e When the incident angle of the light is 30°, the imaging simulation results in the camera module 100 are compared. Figure 10f The following are the imaging simulation results for the camera module 100 of this embodiment when the incident angle of light is 30°. A comparison reveals that, although the incident angle (30°) is significantly greater than the HFOV (6°), significant glare appears in the center of the image of the comparison camera module 100. However, the image of the camera module 100 of this embodiment exhibits very little glare in the center, and the entire image appears completely black. This demonstrates that the angle-selective transmission film 104 effectively blocks stray light.

[0072] In this embodiment of the present application, by setting the angle selective transmission film 104, the stray light entering the camera module 100 can be effectively reduced, thereby reducing the presence of glare, which is beneficial to improving the imaging quality of the camera module 100.

[0073] Reference Figure 11In other embodiments of the present invention, the camera module 100 may be provided with both an upright lens sub-group 101a and a periscope lens sub-group 101b. Specifically, the camera module 100 may include a cover plate 105, an angle-selective transmission film 104, a first infrared filter 102a and a first image sensor 103a corresponding to the upright lens sub-group 101a, and a prism 1011, a horizontal lens assembly 1012, a second infrared filter 102b, and a second image sensor 103b corresponding to the periscope lens sub-group 101b. The angle-selective transmission film 104 is provided on the image side of the cover plate 105, and the upright lens sub-group 101a is provided on the image side of the angle-selective transmission film 104. The upright lens sub-group 101a, the first infrared filter 102a, and the first image sensor 103a are arranged in sequence 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 assembly 1012 is disposed on the image side of the prism 1011, and the periscope lens sub-group 101b, the second infrared filter 102b and the second image sensor 103b are arranged in sequence from the object side to the image side.

[0074] In this embodiment, the field of view angle of the upright lens subgroup 101a is FOV1, the field of view angle of the periscope lens subgroup 101b is FOV2, the optical image stabilization angle of the upright lens subgroup 101a is OIS_angle1, and the optical image stabilization angle of the periscope lens subgroup 101b is OIS_angle 2. Based on the optical parameters of the lens group 101a and the lens group 101b, the light transmittance of the angle selective transmission film 104 can be designed by partitioning, referring to Figure 12 , where area A1 corresponds to the upright lens subgroup 101a, and its light transmittance θt_1 = HFOV1 + OIS_angle1; area A2 corresponds to the periscope lens subgroup 101b, and its light transmittance θt_2 = HFOV2 + OIS_angle2; in this way, the angle-transmitting film can control the stray light of the two lens subgroups respectively.

[0075] In this embodiment, an angle-selective transmission film 104 is placed on the object side of both the upright lens sub-assembly 101a and the periscope lens sub-assembly 101b, effectively simplifying the structure of the camera module. Furthermore, the angle-selective transmission film 104 simultaneously controls the angle of light passing through both the upright lens sub-assembly 101a and the periscope lens sub-assembly 101b, thereby reducing stray light throughout the entire camera module 100.

[0076] In other embodiments, referring to Figure 13Alternatively, an angle selective transmission film may be provided for each of the upright lens sub-group 101a and the periscope lens sub-group 101b. In this case, the angle selective transmission film 104a corresponding to the upright lens sub-group 101a is provided between the cover plate 105 and the upright lens sub-group 101a, while the angle selective transmission film 104b corresponding to the periscope lens sub-group 101b is provided between the prism 1011 and the lens assembly 1012. In some other embodiments, when an angle selective transmission film 104a and an angle selective transmission film 104b are respectively provided for the upright lens sub-group 101a and the periscope lens sub-group 101b, the setting position of each angle selective transmission film can also be adjusted. For example, the angle selective transmission film 104a is set between the upright lens sub-group 101a and the first infrared filter 102a; the angle selective transmission film 104b is set between the horizontal lens assembly 1012 and the second infrared filter 102b. It is sufficient to set it on the object side of the image sensor 103a or the image sensor 103b to reduce the participation of stray light in imaging.

[0077] refer to Figure 14 As shown, the embodiment of the present application further provides an electronic device 200, which can be a common terminal such as a mobile phone, tablet computer, or laptop computer in the prior art. The electronic device 200 can include a housing 201 and the camera module 100 of any of the aforementioned embodiments. The camera module 100 can be disposed within the housing 201 to implement the shooting function of the electronic device 200.

[0078] The camera module 100 of the electronic device 200 is configured to selectively transmit a thin film by setting an angle so that light participating in imaging enters the camera module 100 while blocking the entry of stray light not participating in imaging, thereby effectively improving the imaging effect of the camera module 100 and further enhancing the user experience of the electronic device 200.

[0079] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A camera module, characterized in that: It includes a lens group, an image sensor and an angle selective transmission film, wherein: The lens group includes 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 assembly; The angle selective transmission film is disposed on the object side of the image sensor, and is used to transmit incident light with an incident angle greater than or equal to 0° and less than or equal to θt, and is used to block incident light with an incident angle greater than θt and less than or equal to 90°, where θt is greater than or equal to 0° and less than 90°; The thickness h of the angle selective transmission film satisfies: h=0.1k / tan(θt) mm, wherein k is the quality factor of stray light, and the value of k is greater than or equal to 0.5 and less than or equal to 1.

5.

2. The camera module according to claim 1, wherein: The θt is greater than or equal to the half field angle of the lens group.

3. The camera module according to claim 2, wherein: The lens group has an anti-shake angle, and the light transmission angle θt is greater than or equal to the sum of the half field angle of the lens group and the anti-shake angle.

4. The camera module according to any one of claims 1 to 3, wherein: For light with an incident angle greater than or equal to 0° and less than or equal to θt, the transmittance of the angle selective transmission film is greater than or equal to 80%; for light with an incident angle greater than θt and less than or equal to 90°, the transmittance of the angle selective transmission film is less than or equal to 10%.

5. The camera module according to any one of claims 1 to 3, wherein: The angle selective transmission film includes multiple layers of dielectric films, and at least two layers of the dielectric films have different light refractive indices.

6. The camera module according to claim 5, wherein: The thickness of each layer of the dielectric film is greater than or equal to 50 nm and less than or equal to 200 nm.

7. The camera module according to any one of claims 1 to 3, wherein: The angle selective permeation film is provided with deep holes, and the ratio of the radius r of the deep holes to the hole depth H of the deep holes satisfies: r / H=tan(θt).

8. The camera module according to any one of claims 1 to 3, wherein: The angle selective transmission film is arranged on the object side of the lens group; or, the angle selective transmission film is arranged between the lens group and the image sensor.

9. The camera module according to any one of claims 1 to 3, wherein: The camera module further includes an infrared filter, which is arranged between the lens group and the image sensor, and the angle selective transmission film is arranged between the lens group and the infrared filter.

10. The camera module according to any one of claims 1 to 3, wherein: The lens group is an upright lens group, or the lens group is a periscope lens group.

11. The camera module according to any one of claims 1 to 3, wherein: The lens group is a combination of an upright lens subgroup and a periscope lens subgroup. There is one angle selective transmission film, which is arranged on the object side of the lens group. The angle selective transmission film has a first area corresponding to the upright lens sub-group and a second area corresponding to the periscope lens sub-group.

12. The camera module according to any one of claims 1 to 3, wherein: The lens group is a combination of an upright lens subgroup and a periscope lens subgroup. There are two angle selective transmission films, one of which corresponds to the upright lens subgroup and the other corresponds to the periscope lens subgroup.

13. The camera module according to claim 12, wherein: The angle selective transmission film corresponding to the upright lens subgroup is disposed on the object side of the upright lens subgroup, or is disposed between the upright lens subgroup and the first image sensor corresponding to the upright lens subgroup.

14. The camera module according to claim 13, wherein: The camera module also includes a first infrared filter corresponding to the upright lens sub-group, the first infrared filter is arranged between the upright lens sub-group and the first image sensor, and an angle-selective transmission film corresponding to the upright lens sub-group is arranged between the upright lens sub-group and the first infrared filter.

15. The camera module according to claim 12, wherein: The periscope lens subgroup includes an optical component and a horizontal lens component for changing the light transmission path. The angle-selective transmission film corresponding to the periscope lens subgroup is arranged between the optical component and the horizontal lens component, or, is arranged between the horizontal lens component and the second image sensor corresponding to the periscope lens subgroup.

16. The camera module according to claim 15, wherein: It also includes a second infrared filter corresponding to the periscope lens subgroup, the second infrared filter is arranged between the horizontal lens assembly and the second image sensor, and the angle-selective transmission film corresponding to the periscope lens subgroup is arranged between the horizontal lens assembly and the second infrared filter.

17. The camera module according to any one of claims 1 to 3, wherein: The camera module further includes a cover plate, which is arranged on the object side of other components in the camera module.

18. The camera module according to any one of claims 1 to 3, wherein: The angle selective transmission film is made of ferrous metal or ferrous non-metallic material.

19. An electronic device, characterized in that: It comprises a shell and the camera module according to any one of claims 1 to 18, wherein the camera module is arranged in the shell.

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